Document elcerrito_gov_doc_775be6581b

City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 CITY OF EL CERRITO PRE-QUALIFICATION QUESTIONNAIRE AND REQUEST FOR PROPOSALS FOR PROSPECTIVE DESIGN/BUILD ENTITIES Small Cities Climate Action Partnership Solar Photovoltaic System Joint Procurement Attachments A through F3 City of El Cerrito City of Albany City of Piedmont City of San Pablo December 15, 2011 ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment A: SITE INVENTORY SMALL CITIES CLIMATE ACTION PARTNERSHIP SOLAR PHOTOVOLTAIC JOINT PROCUREMENT Latest Update: 12/14/ 2011 City Index Current Use Bundle Site Address Rate Sched. Annual Usage (kWh) Install Type Max. Syst. Size (kW DC) Rec. ize (kW DC) Rec. Syst. Output (kWh) Rec. Syst. % Offset Building Voltage Main Breaker Amp. Enclo sure Amp. Roof Type Approx. Roof Pitch Albany ALB01 Teen Center Small 1331 Portland Ave., Albany CA 94706 A1 9,727 Shade structure 17 8 10,287 106% 120/240 1-phase 200 200 clay tile N/A Albany ALB02 City Hall Large 1000 San Pablo Ave., Albany CA 94706 E20S 273,360 Roof, carport 120 120 152,102 56% 120/208 3phase 800 800 standing seam, torch- down 14, 0 Albany ALB03 Community Center Medium 1249 Marin Ave., Albany CA 94706 A10S 151,893 Roof, carport 53 53 70,236 46% 480/277 3-phase 400 400 tar & gravel 0 Albany ALB05 Childcare Center Medium 900 Buchanan St., Albany CA 94706 A10S 38,447 Roof, shade structure 34 26 34,510 90% 120/208 3phase 600 600 torch- down 0 San Pablo SP01 City Hall- Building 1 Large 13831 San Pablo Ave., San Pablo CA 94806 A1 28,317 Carport 193 193 245,994 71% 120/240 1-phase 200 200 clay tile N/A San Pablo City Hall- Building 2 Large E19SV 121,400 120/208 3-phase 400 400 clay tile San Pablo City Hall- Building 3 Large A10S 180,320 120/208 3-phase clay tile San Pablo City Hall- Large A1 48,957 120/208 200 200 clay tile ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Building 5 3-phase San Pablo SP02 Police Department Large 13880 San Pablo Ave., San Pablo CA 94806 E19SV 284,960 Roof, carport 126 126 162,778 57% 120/208 3-phase 400 800 concrete tile, torchdo wn 20, 0 San Pablo SP03 Church Lane Senior Center Medium 1943 Church Lane, San Pablo CA 94806 A1 49,853 Carport 50 34 42,369 85% 120/240 1 phase 200 200 clay tile N/A San Pablo SP04 Davis Senior Center Small 1651 Folsom Ave., San Pablo CA 94806 A1 11,781 Roof 90 6 7,982 68% 120/240 1 phase ~200 ~200 comp. shingle 16.5 San Pablo SP05 Multi Purpose Building Small 1667 Folsom Ave., San Pablo CA 94806 A1 7,844 Roof 13 6 7,983 102% 120/240 1 phase ~200 ~200 comp. shingle, tar & gravel 16 Piedmont PDM01 City Hall Medium 120 Vista Ave., Piedmont CA 94611 A10S 222,430 Roof 21 21 27,060 12% 120/240 1 phase ~400 ~400 torch- down, tar & gravel 0 Piedmont PDM02 Veterans' Hall Medium 401 Highland Ave., Piedmont CA 94611 A10S 71,787 Roof 18 18 23,787 33% 120/240 1 phase 400 400 torch- down 10 Piedmont PDM03 Recreation Center Medium 358 Hillside Ave., Piedmont CA 94611 A1 22,862 Shade structure 16 16 20,518 90% 120/240 1 phase ~100 comp. shingle N/A Piedmont PDM04 Corporation Yard Medium 699 Moraga Ave., Piedmont CA 94611 A1 13,424 Roof, carport 34 10 12,948 96% 120/208 3 phase 200 200 comp. shingle, torch- down 23, 0 El Cerrito ELC01 Public Safety Building Large 10900 San Pablo Ave., El Cerrito E19SV 255,120 Roof, carport 153 143 182,211 71% 120/208 3 phase 600 600 concrete tile 10 ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 CA 94530 El Cerrito ELC02 Fire Station #72 Medium 1520 Arlingon Blvd., El Cerrito CA 94530 A1 38,640 Roof, carport 42 27 35,790 93% 120/240 1 phase 400 400 tar & gravel, corrugat ed metal 0, 23 El Cerrito ELC03 City Hall Small 10890 San Pablo Ave., El Cerrito CA 94530 A10S 243,840 Roof 39 4 5,230 2% 120/208 3 phase 1200 1200 standing seam 18 El Cerrito ELC04 Public Works Yard Medium 7450 Schmidt Ln., El Cerrito CA 94530 A1 34,793 Carport 40 24 30,717 88% 120/240 1-phase comp. shingle, tar & gravel 10, 0 El Cerrito ELC07 Canyon Trail Clubhouse Small 6757 Gatto Ave., El Cerrito CA 94530 A1 6,503 Roof 10 5 6,344 98% 120/240 1-phase 100 100 tar & gravel 10 El Cerrito ELC09 Castro Park Clubhouse Small 1420 Norvell St., El Cerrito CA 94530 A6 17,225 Roof 4 4 5,289 31% 120/240 1-phase tar & gravel 10 El Cerrito ELC10 Fairmont Childcare Center Small 715 Lexington Ave., El Cerrito CA 94530 A6 5,490 Roof 7 3 3,877 71% 120/240 1-phase 100 125 comp. shingle 25 El Cerrito ELC11 Harding Childcare Center Small 7115 C St., El Cerrito CA 94530 A1 10,193 Roof 6 6 7,562 74% 120/240 1-phase 100 ~100 tar & gravel 0 El Cerrito ELC12 Madera Childcare Center Small 1500 Devonshire Dr., El Cerrito CA 94530 A1 7,084 Roof 7 5 6,540 92% comp. shingle 24 El Cerrito ELC14/ 15 Community Center - Offices Large 7007 Moeser Ln., El Cerrito CA 94530 A10S 212,640 Carport 165 128 161,314 76% 480/277 3-phase N/A N/A ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 El Cerrito Community Center - Pools Large E19SV 118,160 92 72 90,739 77% 480/277 3-phase 400 N/A N/A El Cerrito ELC17 Recycling Center Medium 7501 Schmidt Ln, El Cerrito CA 94530 TBD 16,965 Roof 119 12 15,340 90% TBD TBD Berkeley BER01 West Branch Library Medium 1125 University Ave, Berkeley CA 94701 A1 55,000 Roof 43 43 55,500 100% TBD 0 ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment B Large Bundle Site Assessments ---PAGE BREAK--- 1 SP01: City Hall Site Address: 13831 San Pablo Avenue, San Pablo, CA 94806 Type of PV System: Carport Current PG&E Rate Schedule: A1, E19S, A10 Annual Energy Usage: 348,796 kWh Maximum System Size: 193 kW-DC Maximum System Output: 245,934 kWh Recommended System Size: 193 kW-DC Recommended System Output: 245,934 kWh Energy Offset: 71% (for four primary site meters) Issues: Clay tile roofing material, possible extensive trenching, tree removal Opportunities: Community leadership, offset multiple meters, vehicle shading The San Pablo City Hall is comprised of five main buildings and a historic adobe house. Buildings 1-4 (see Figure 1) are arranged in a square formation around a central courtyard. Building 5 is located southeast of this formation. A large majority of the rooftop surface is covered by clay tiles, although some sections have been replaced with concrete tiles. Due to the brittle nature of clay tiles, it is not advisable to install PV systems on the rooftop. Clay tiles could be removed and replaced with shingle roofing; however, such re-roofing work may be undesirable due to cost or aesthetic considerations. Figure 1 shows the usable areas for City Hall, which are highlighted in green. The red boxes in Figure 1 indicate the locations of the site’s multiple meters. System modeling has been based upon interconnecting to and offsetting all four primary meters on-site. Figure 1 City Hall Usable Areas 1 4 3 2 5 ---PAGE BREAK--- 2 Elevated solar PV carports can be installed within all the marked sections. Sections 1-4 are in the main parking lot, and Sections 5-6 are in front of Building 5. To allow for construction and to gain full access to the solar resource, some tree removal will be required. A summary of the estimated PV production from each section can be found in Table 1 below. The recommended system size of 193 kW-DC would use all of the identified usable areas. The term “azimuth” refers to compass orientation that carports would be angled towards in order to match and fit into existing structures. Table 1 City Hall Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 132° 8,494 96.0 121,711 2 132° 2,378 28.0 35,499 3 132° 2,070 22.0 27,892 4 132° 1,942 19.0 24,089 5 222° 1,823 19.0 24,933 6 222° 866 9.0 11,810 Total 17,573 193.0 245,934 Recommended System 193.0 245,934 Approximately 245,934 kWh would be produced by the total PV system annually. This corresponds to 71% of the City Hall’s yearly usage at the site’s four primary meters. The meter located at Building 1 is inside the electrical room, adjacent to an external wall. Voltage is single-phase, with main breaker and enclosure amperage rating of 200A. There is no space inside the electrical room for additional electrical equipment; however, there is ample space for electrical equipment on the exterior wall of the electrical room. The meter for Building 2 is located outside the building in a small courtyard area. Building 2 voltage is 120/208V, 3-phase. Both the main breaker and enclosure amperage rating are 400A. There is available space next to the meter for additional electrical equipment. Buildings 3 and 4 share a meter located in the basement of Building 4. Interior space is not available for installation of additional electrical equipment, so a suitable external location would need to be located. Voltage at this meter is 120/208V, 3-phase. The meter for Building 5 is located on an exterior wall of that building. There is no space for additional equipment immediately adjacent to the meter, though nearby locations are available. Building voltage is 120/208V, 3-phase. Main breaker and enclosure amperage rating is 200A. This building has a back-up generator. Extensive trenching may be required between PV Sections 1-4 and Buildings 1-4 in order to deliver solar-generated energy to the interconnection points. It may be possible to route the conduits from Sections 1-4 under the eaves of Buildings 1-4 to minimize trenching near the buildings. ---PAGE BREAK--- SP02: Police Department Site Address: 13880 San Pablo Avenue, San Pablo CA 94806 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: E19SV Annual Energy Usage: 284,960 kWh Maximum System Size: 126 kW-DC Maximum System Output: 162,778 kWh Recommended System Size: 126 kW-DC Recommended System Output: 162,778 kWh Energy Offset: 57% Issues: Steep roof pitch with concrete tiles, HVAC equipment, tree removal, building shading Opportunities: Vehicle shading The San Pablo Police Department office building is a two-story building with a central torch-down rooftop section and pitched portions covered with concrete S-tiles. The usable areas of the parking lot and rooftop are shown in Figure 2 below. The red box indicates the approximate location of the electrical room on the first floor. Figure 2 Police Department Usable Areas ---PAGE BREAK--- 4 The flat portion of the rooftop is surrounded by a parapet that is six feet tall. The usable area is limited by the mechanical equipment on the rooftop. The boundaries of Section 1 have been selected to minimize any shade issues. A structural review of the roof needs to be conducted to verify its ability to support additional weight load. Elevated solar PV carports can be installed in Sections 2-8. Section 4 is located next to a building about 30-feet tall, which may cause shade issues during the early part of the day. This shade issue may be mitigated by constructing carports that are elevated higher than the usual nine or ten feet. Section 6 is located next to trees which will cast shade on the panels and may need to be removed to allow for efficient operation of solar panels. Figure 3 shows the solar access for Section 6. Figure 3 Section 6 Solar Access The average solar access for Section 6 is 67%. This means that a system in this location would consistently underperform throughout the year, though relocating or removing several of the trees would lessen shading impact. A summary of the estimated production from each section can be found in Table 2 below. All sections will be needed in order to reach the recommended system size of 126 kW-DC. This recommended system size will produce approximately 162,778 kWh annually, which corresponds to 57% of the site usage. The production numbers for Section 6 have not been adjusted to account for underproduction due to shading issues. It is assumed that the necessary trees will be removed. Table 2 Police Department Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 222° 818 9.0 11,810 2 132° 622 6.5 8,370 3 132° 1,296 13.5 17,384 4 132° 1,944 21.5 27,686 5 132° 2,203 21.0 27,042 6 222° 854 10.5 13,778 7 132° 1,937 22.0 28,329 8 132° 788 8.0 10,302 9 222° 172 2.0 2,625 10 132° 1,008 12.0 15,452 Total 11,642 126.0 162,778 Recommended System 126.0 162,778 The electrical room is located on the first floor of the building. Building voltage is 120/208V, 3-phase. The main breaker amperage rating is 400A and the enclosure amperage rating is 800A. There will be no upgrades needed if PV systems are ---PAGE BREAK--- 5 installed at this site. There is no space in the electrical room for any additional electrical equipment. Space along exterior walls is available for installation of inverter or inverters. The building has a back-up generator. . ---PAGE BREAK--- 6 ELC01: Public Safety Building Site Address: 10900 San Pablo Avenue, El Cerrito, CA 94530 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: E19-SV Annual Energy Usage: 255,120 kWh Maximum System Size: 153 kW-DC Maximum System Output: 195,267 kWh Recommended System Size: 143 kW-DC Recommended System Output: 182,211 kWh Energy Offset: 71% Issues: Limited roof space, tree shading, antenna shading Opportunities: Vehicle shading, tree trimming, delineation of City-owned parking The El Cerrito Public Safety Building is located in downtown El Cerrito across the street from City Hall. The roof of the building is composed of concrete tiles and is pitched at approximately 10°. At this site, both rooftop PV systems and carport PV systems can be installed. The usable areas are highlighted in Figure 4 below. The red box indicates the location of the electrical room inside the building. Figure 4 Safety Building Usable Areas ---PAGE BREAK--- 7 Sections 1-3 are located on the rooftops and Sections 4-6 are located in parking areas. There are trees located southwest of Section 1, which may pose a partial shading obstruction. The various lampposts in the parking lots may need to be removed and replaced with carport lighting to ensure that they do not pose a significant shading obstruction to any solar PV panels which may be installed in the indicated areas. Additionally, a large radio antenna exists immediately southwest of Section 5. This antenna cannot be removed or relocated, so resulting shading will need to be considered in final system design. A summary of estimated production from each section is shown in Table 3 below. A system size of 143 kW is recommended at this site. A system of this size would produce about 182,211 kWh annually, which would offset 71% of the site’s electrical usage and virtually eliminate the facility’s electricity bill. Shading considerations have not been included in production estimates below. For rooftop installation, a structural review will need to be conducted in order to ensure that the roof can support the additional load from the PV panels and the racking structures. Table 3 Safety Building Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW DC) First Year Production (kWh) 1 240° 1,575 17.50 22,398 2 150° 2,287 25.50 33,340 3 240° 753 7.80 9,983 4 150° 3,036 34.50 43,975 5 240° 1,567 18.40 23,189 6 240° 4,008 49.50 62,383 Total 13,226 153.20 195,267 Recommended System 143.00 182,211 The utility meter is located inside the electrical room in the building as indicated in Figure 4 in the previous page. Voltage is three-phase, 120/208V. Main breaker and enclosure ratings are 600A. A diesel back-up generator is located and interconnected on-site. ---PAGE BREAK--- 8 ELC14: Community Center – Offices ELC15: Community Center - Pools Site Address: 7007 Moeser Lane, El Cerrito, CA 94530 Type of PV System: Carport, Shade Structure Current PG&E Rate Schedule: A10-S (offices), E19-SV (pools) Annual Energy Usage: 212,640 kWh (offices), 118,160 kWh (pools) Maximum System Size: 231 kW-DC Maximum System Output: 293,459 kWh Recommended System Size: 128 kW-DC (offices), 72 kW-DC (pools) Recommended System Output: 161,314 kWh (offices), 90,739 kWh (pools) Energy Offset: over 100% possible, 76% (offices), 77% (pools) Issues: Site security for equipment, tree removal Opportunities: Vehicle shading The El Cerrito Community Center is serviced by two electrical meters: one for the offices at the south end of the site, and another for the pools. The office building does not have a suitable roof for PV installation due to shading from trees growing in front of the roofs and possible near-future roof replacement. Additionally, roofs of poolside changing rooms are under consideration for solar pool heating and have not been included in the recommended areas of this report. Instead, the parking lot is recommended for solar PV carports. The usable areas for PV installation are shown in Figure 5 below, with the red boxes indicating the locations of the site meters. Figure 5 Community Center Usable Areas Section 1 is a grassy area where a solar shade structure could be built. The building to the southeast of this section provides some shading for this area, but a taller solar structure could experience minimal shading. Sections 2 and 3 ---PAGE BREAK--- 9 are located on slatting extending from the poolside changing rooms. These areas are not considered structurally sufficient for holding solar pool heating panels, but may be suitable for PV. Any use of these two areas would require a structural review. Table 4 below shows a list of the production from each section. For both the administrative offices and the pools of the Community Center, a 200 kW-DC system size is recommended, with 128 kW-DC recommended for the offices meter and 72 kW-DC for the pools meter. The 252,053 kWh produced annually by this system would correspond to a 76% energy offset for the offices and a 77% offset for the pools, which would virtually eliminate the electricity bills for both meters. Only two sections—the carports, as noted above—would be needed to reach the target system size. The recommended sizing and location are highlighted in the table below. Sections 1, 4 and 5 have been highlighted as the preferred location of the PV systems. Table 4 Community Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 240° 1,427 18.0 23,315 2 240° 488 6.0 7,562 3 240° 736 9.0 11,342 4 240° 6,204 79.0 101,269 5 240° 9,295 119.0 149,971 Total 18,150 231.0 293,459 Recommended System 200.0 252,053 The parking lot at the Community Center is large, and cars would benefit from shading from solar carports. Two primary concerns exist for carport installation at this site: multiple existing trees in the area, and potential for rock- throwing from the schoolyard to the northeast, above the parking lot. Approximately 6-8 trees would have to be removed from the southwestern part of the lot to allow for a row of carports. Most of those potentially affected trees are immature and some could possibly be relocated. On the northeastern side of the lot, on the slope between the lot and the schoolyard, approximately 50 trees exist that could potentially cause shading. However, many of these trees may cause little to no damaging shade on installed carports, so a more detailed shading analysis would be needed to determine exactly which trees would need to be removed. Plans are being considered to move the neighboring school to a new location, which would help minimize rock-throwing from above. Additionally, after some damage was caused to parked cars, actions have been taken to lessen students’ accessibility to rocks in the schoolyard. As a design consideration, the parking lot area directly in front (east) of the office building is considered unusable for solar and should not be included in the design of PV arrays. This area should remain clear to maintain the visual appeal of the site and the historic building. The location of the meter for the offices is indicated by the lower red box in Figure 5. The electrical room is located on the first floor of the building. Building voltage and switchgear amperage could not be determined during the site visit. The switchgear is fairly old, and there is no space in the electrical room for additional electrical equipment. The upper red box in Figure 5 shows the location of the utility meter for the pools. Voltage at the meter is 480/277V, 3-phase, 4-wire, with 400A main breaker. Limited space is available in the electrical room for the installation of additional electrical equipment. ---PAGE BREAK--- 10 ALB02: City Hall Site Address: 1000 San Pablo Avenue, Albany, CA 94706 Type of PV System: Carport, Rooftop Current PG&E Rate Schedule: E20-S Annual Energy Usage: 273,360 kWh Maximum System Size: 120 kW-DC Maximum System Output: 152,102 kWh Recommended System Size: 120 kW-DC Recommended System Output: 152,102 kWh Energy Offset: 56% Issues: Tree removal, possible extensive trenching, HVAC equipment, existing solar array Opportunities: Community leadership, vehicle shading Albany City Hall is relatively new construction and shares a site with the City Fire Department and Police Department. Figure 6 shows the areas at Albany’s City Hall that are usable for PV systems. Sections 1 and 3 are on a flat torch-down rooftop, while Sections 2, 7, 8, 9, and 10 are on metal standing seam rooftops with approximately 14° roof pitch. Adjacent to Section 7 is an existing PV system sized about 25 kW-DC. The red box indicates the location of the site utility meter. Figure 6 City Hall Usable Areas ---PAGE BREAK--- 11 Table 5 below shows a summary of the orientation of each section and production from each section. The recommended 120 kW-DC system size would utilize all of the identified usable areas. The 152,102 kWh that the system could produce would offset about 56% of the site’s usage. Table 5 City Hall Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 215° 403 5.0 6,400 2 123° 1,744 20.0 25,112 3 215° 382 5.0 6,400 4 123° 1,241 13.0 16,323 5 123° 2,482 26.0 32,645 6 123° 710 8.0 10,045 7 255° 807 9.0 12,050 8 255° 1,576 16.5 20,929 9 255° 1,003 11.5 14,587 10 255° 529 6.0 7,611 Total 10,877 120.0 152,102 Recommended System 120.0 152,102 The existing PV system is currently shaded by pine trees existing on-site. The system could achieve a minimum of 10% better production if at least one of the trees were removed. This increase in production would be enough to offset electrical usage at a typical single-family home. For the proposed PV installation to achieve projected output levels, additional trees would need to be removed or regularly trimmed. The switchgear at the site powers the City Hall, Fire Department, and Police Department through one utility meter located in the northeastern corner of the property. Voltage at the meter is 120/208V, and the main breaker amperage is believed to be 800A. ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment C Medium Bundle Site Assessments ---PAGE BREAK--- 1 SP03: Church Lane Senior Center Site Address: 1942 Church Lane, San Pablo, CA 94806 Type of PV System: Carport Current PG&E Rate Schedule: A1 Annual Energy Usage: 49,853 kWh Maximum System Size: 50 kW-DC Maximum System Output: 62,904 kWh Recommended System Size: 34 kW-DC Recommended System Output: 42,369 kWh Energy Offset: over 100% possible, 85% recommended Issues: Clay tile roofing material, tree shading Opportunities: Vehicle shading, full offset of on-site electrical usage The Church Lane Senior Center is a one-story building with an attic. The rooftop is covered by clay tiles, making rooftop PV installation inadvisable. Clay tiles could be removed and replaced with shingle roofing; however, such re-roofing work may be undesirable due to cost or aesthetic considerations. Figure 1 shows the usable areas at this site. The remainder of the parking lot experiences shading issues. The parking area directly across from Section 1 is shaded by the building, and the parking area southwest of Section2 is shaded by the tall trees that are located in the neighboring lot. Figure 1 Church Lane Senior Center Usable Areas ---PAGE BREAK--- 2 Table 1 shows the estimated solar production from each section. Utilizing both sections would produce over 100% of the site’s energy usage. The recommended size of 34 kW-DC would produce about 42,369 kWh which would offset 85% of the site’s usage. With a utility rate schedule change to one with higher Time-Of-Use (TOU) rates, the utility bill at this site could be virtually eliminated. The PG&E A6 rate schedule has a higher peak TOU rate compared to the A1 rate schedule. By producing energy at peak hours (and prices), a credit is generated with PG&E. These credits can be used during off-peak periods when utility prices are lower. Table 1 Church Lane Senior Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 106° 3,068 34.0 42,369 2 215° 1,478 16.0 20,535 Total 4,546 50.0 62,904 Recommended System 34.0 42,369 The electrical meter is located on the north-facing exterior wall of the building. Building voltage is 120/240V, single phase. The main breaker and enclosure amperage ratings are 200A. There is space for additional electrical equipment next to the meter. ---PAGE BREAK--- 3 PDM01: City Hall and Fire Department Site Address: 120 Vista Avenue, Piedmont, CA 94611 Type of PV System: Rooftop Current PG&E Rate Schedule: A10S Annual Energy Usage: 222,430 kWh Maximum System Size: 21 kW-DC Maximum System Output: 27,060 kWh Recommended System Size: 21 kW-DC Recommended System Output: 27,060 kWh Energy Offset: 12% Issues: Limited roof space, HVAC/telecom equipment, roof obstructions Opportunities: Community leadership The Piedmont City Hall and Fire Department building has three rooftop areas that were evaluated for solar potential. The usable areas are highlighted in Figure 2. Section 1 is on the portion of the building with the highest elevation. Section 3 is at the lowest elevation. The red box indicates the location of the utility meter. Figure 2 City Hall and Fire Department Usable Areas ---PAGE BREAK--- 4 The available space on Section 1 is limited by the existing HVAC and communications equipment on the rooftop. Figure 3 is a picture of Section 1 taken from the southern part of the section, looking north. There is a very low parapet around the perimeter of this section. Figure 3 Section 1 Usable Area Section 2 is bordered by a parapet that is two feet high on the western and southern sides. Section 2 is relatively free of obstructions, as shown in Figure 4. The picture was taken from the southwestern corner of the roof, facing northeast. Figure 4 Section 2 Usable Area ---PAGE BREAK--- 5 Section 3 is on a rooftop composed of tar and gravel. Similar to Section 2, this section is also relatively free of obstructions. A summary of the possible first-year production from each section can be found in Table 2 below. Utilizing all viable sections would allow for the construction of a 21 kW-DC system. A system of this size would produce approximately 27,060 kWh annually, which would only offset approximately 12% of the site electrical usage. The term “azimuth” in the table refers to compass orientation that solar arrays would be angled towards in order to match and fit into existing structures. Table 2 City Hall and Fire Department Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 154° 504 6.0 7,731 2 154° 639 7.0 9,020 3 154° 768 8.0 10,309 Total 1,911 21.0 27,060 Recommended System 21.0 27,060 The site utility meter is located on an external wall east of Section 3. Building voltage is single-phase, 120/240V, with enclosure and main breaker ratings of 400A. There is limited space near the meter to accommodate installation of inverters and other electrical equipment. ---PAGE BREAK--- 6 PDM02: Veterans’ Building and Police Department Site Address: 401 Highland Avenue, Piedmont, CA 94611 Type of PV System: Rooftop Current PG&E Rate Schedule: A10S Annual Energy Usage: 71,787 kWh Maximum System Size: 18 kW-DC Maximum System Output: 23,787 kWh Recommended System Size: 18 kW-DC Recommended System Output: 23,787 kWh Energy Offset: 33% Issues: Tree shading, HVAC equipment, limited roof space, roof obstructions Opportunities: Tree trimming The Veteran’s Building and Police Department are co-located at a site directly next to Piedmont City Hall and Fire Department (PDM01). The building is surrounded on the other three sides by tall redwood trees. The torch-down roof appears to be in acceptable condition and is pitched at approximately 10°. The usable areas of the roof are shown in Figure 5 below. Due to roof orientation in relation to the position of the sun in the sky, the northern portion of the rooftop is not recommended for a PV system. The red box indicates the location of the electrical switchgear. Figure 5 Veterans' Building and Police Department Usable Areas ---PAGE BREAK--- 7 There is mechanical equipment on the rooftop which would need to be avoided during the installation process. This equipment can be seen in Figure 6 below. Figure 6 Mechanical Equipment (View from the West) There are a few very tall redwood trees south of the building. These redwood trees would block sunlight from reaching the panels, hindering power production. During the summer months, solar access average is 93%, but decreases to 78% in the winter months. Figure 7 shows a summary of the solar access for each month, and also some shade obstructions. Very selective tree trimming or removal is recommended. Figure 7 Section 1 and 2 Solar Access A summary of the production from each section can be found below. The production simulation was performed with the assumption that tree trimming would occur. Without the shading obstruction, 23,787 kWh could be produced by a PV system using both sections, which corresponds to a 31% energy offset. If the redwood trees remain untouched, the production would be reduced by approximately 20%. Table 3 Veterans' Building and Police Department Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 154° 1,493 12.0 15,858 2 154° 500 6.0 7,929 Total 1,993 18.0 23,787 Recommended System 18.0 23,787 ---PAGE BREAK--- 8 A structural review of the rooftop load capacity is recommended, as is an electrical review of existing switchgear. Building voltage is single-phase, 120/240V, and the main breaker and enclosure amperage ratings are 400A. The switchgear is located in downstairs hallway of the building, with no room for additional electrical equipment. Limited wall and ground space are available near the interconnection point. . ---PAGE BREAK--- 9 PDM03: Recreation Center Site Address: 358 Hillside Avenue, Piedmont, CA 94611 Type of PV System: Shade Structure Current PG&E Rate Schedule: A1 Annual Energy Usage: 22,862 kWh Maximum System Size: 16 kW-DC Maximum System Output: 20,518 kWh Recommended System Size: 16 kW-DC Recommended System Output: 20,518 kWh Energy Offset: 90% Issues: Limited roof space, steep roof pitch, building shading Opportunities: Spectator shading The Recreation Center is housed in a Tudor-style building which was originally constructed to be a two-story residential home. A rooftop PV system is not recommended at this site due to the cross-gable roof design which severely limits the usable area of the rooftop and creates a steep roof pitch. The usable area for a PV installation is confined to a location behind the building as shown in Figure 8 below. The red box indicates the location of the meter. Figure 8 Recreation Center Usable Areas ---PAGE BREAK--- 10 Section 1 is not extended into the open courtyard area directly behind the building, as this area would be in the shade of the building for a majority of the day. Within Sections 1 and 2, a shade structure could be built that would generate power as well as provide shade for the seating areas located within both sections. Section 2 overhangs a fence and property that the City may not want to infringe upon, so final system design would need to consider current and future City plans, as well as City Building Department set-back requirements. Table 4 shows a summary of the production from each section. Table 4 Recreation Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 231° 700 8.0 10,259 2 231° 700 8.0 10,259 Total 1,400 16.0 20,518 Recommended System 16.0 20,518 The recommended system size is 16 kW-DC, which would produce approximately 20,518 kWh in the first year of operation. This size PV system would be able to offset about 90% of the site’s electricity usage. With a utility rate schedule change to one with higher Time-Of-Use (TOU) rates, the utility bill at this site could be virtually eliminated. The PG&E A6 rate schedule has a higher peak TOU rate compared to the A1 rate schedule. By producing energy at peak hours (and prices), a credit is generated with PG&E. These credits can be used during off- peak periods when utility prices are lower. The meter at this site is located on a southeastern external wall of the building, facing the street. Building voltage is single-phase, 120/240V, and the main breaker and amperage ratings are believed to be 100A. ---PAGE BREAK--- 11 PDM04: Corporation Yard Site Address: 699 Moraga Avenue, Piedmont, CA 94611 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: A1 Annual Energy Usage: 13,424 kWh Maximum System Size: 34 kW-DC Maximum System Output: 41,319 kWh Recommended System Size: 10 kW-DC Recommended System Output: 12,948 kWh Energy Offset: over 100% possible, 96% recommended Issues: Tree shading, possible extensive trenching, roof obstructions, building shading Opportunities: Vehicle shading, full offset of on-site electrical usage, tree trimming The Piedmont Corporation Yard is surrounded by hills on the north and east sides, and tall trees on the west and south sides. Usable areas for PV installation are shown in Figure 9, with location of the utility meter highlighted by the red box. Figure 9 Corporation Yard Usable Areas An elevated PV carport can be installed in Section 1. Typically, carports are nine or ten feet tall, but, at the Corporation Yard, higher structures would be required to accommodate the taller vehicles which are parked in this section. Section 2 is on the southeast-facing slope of a building rooftop pitched at approximately 23°. Section 3 is situated over the truck wash area. Section 4 is on a flat rooftop of a storage building. ---PAGE BREAK--- 12 Table 5 below shows a summary of the production from each section. The highlighted cells correspond to the recommended system size and location. The annual power usage at this site is 13,424 kWh. If all four sections were used for a solar installation, the system would produce 81,527 kWh in the first year, which would offset over six times the current energy usage. The recommended system would produce 12,948 kWh, equivalent to 96% of the energy consumed at this site. A system of that size would virtually eliminate the electricity bill for the Corporation Yard. Table 5 Corporation Yard Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 205° 2,014 22.0 28,486 2 115° 335 3.5 4,383 3 205° 832 8.5 11,006 4 185° 3,168 29.2 37,952 Total 3,181 63.2 81,827 Recommended System 10.0 12,948 Section 3 is a proposed carport over an existing truck wash area. Construction of a carport in this location is desired by the City’s Public Works Department, and City Engineers would participate in creating a design for the new structure. While the footprint of Section 3 could be expanded to accommodate a larger PV system, a shade analysis at the boundaries of this section shows that solar access in this area would average 71% during the summer months and only 65% during the winter months. Figure 10 shows the average solar access in Section 3. The tall trees on the hillside to the southeast block sunlight in the morning and the tall building adjacent would block sunlight in the late afternoon. Energy production shown the Table 11 above does not consider the shading issues in Section 3. Figure 10 Section 3 Solar Access The Section 2 rooftop is conveniently located close to the interconnection point, but is unable to accommodate the recommended 10 kW-DC system due to the limited usable space. The roof material is comp shingle, and appears to be in generally good condition. A structural review would be needed before installing PV on this roof. Utilizing this available space, in conjunction with a new carport in Section 3, should be able to meet all or most of the energy production needs of the facility, regardless of some shading in Section 3. As an alternative, Figure 11 on the following page shows the solar access for Section 1. Solar access averages 89% during the summer months and 83% during the winter months. During peak-sun hours in the middle of the day, ---PAGE BREAK--- 13 Section 1 will be shade-free. Early morning and late afternoon shading may be minimized with strategic tree trimming. Figure 11 Section 1 Solar Access Section 4 is another alternative location for solar installation. This storage building is older and would need structural upgrades to enable the construction of a PV system on the roof. If this location is desired, City Engineers would participate in the design and engineering of needed improvements. Shading is believed to be similar to shading in Section 1. Figure 12 Location of Site Meter The utility meter is located on an external wall of the small building located west of Section 2, as indicated by the red box on Figure 9. There is available space near the meter for installation of additional electrical equipment, as shown in Figure 12 above. Voltage at the meter is believed to be 3-phase, 120/208V, with main breaker and enclosure ratings of 200A. . ---PAGE BREAK--- 14 ELC02: Fire Station #72 Site Address: 1520 Arlington Boulevard, El Cerrito, CA 94530 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: A1 Annual Energy Usage: 38,640 kWh Maximum System Size: 42 kW-DC Maximum System Output: 55,863 kWh Recommended System Size: 27 kW-DC Recommended System Output: 35,790 kWh Energy Offset: over 100% possible, 93% recommended Issues: Limited roof space, roof obstructions, building shading Opportunities: Vehicle shading, full offset of on-site electrical usage Fire Station #72 is a tall one-story building constructed in 2001 with 42,000 sq. feet of space to accommodate living quarters as well as equipment. The usable areas are shown in Figure 13 below. The red square indicates the location of the electrical meter. Figure 13 Fire Station #72 Usable Areas ---PAGE BREAK--- 15 Section 1 is in the rear parking lot of the fire station. The trees east of this section have been removed and do not present a significant shade issue. There is enough distance between the rear of the building and Section 1 that shading from the building is also not an issue. A Country Club golf course is located to the north of the site, and occasionally stray golf balls hit cars in the parking lot. The golf balls are not considered a significant hazard due to surrounding trees and distance between the holes and the Fire Station, but damage prevention/mitigation methods should be considered. Regular inspection and maintenance on an installed PV system will prevent any damage from going unnoticed for long periods of time. Section 2 is on the flat portion of the rooftop, which is covered in tar and gravel. The size of Section 2 is limited by the obstructions and building shading present on the rooftop. Sections 3 and 4 are on a corrugated metal rooftop pitched at approximately 23° and facing west. A summary of the potential solar production from each section is shown in Table 6 below. The highlighted sections indicate the recommended system size as well as the location of the system. If all four sections are used, 55,863 kWh could be produced annually, which is greater than the site’s current annual usage. Using only Section 1, a 27 kW-DC system can be built, which would offset over 90% of the energy used at the site and virtually eliminate the electricity bill. As rooftop installations are generally less costly than carports, a system could be installed that used all of Section 2, with the remaining 17 kW-DC installed on a carport in Section 1. If the use of any rooftop section is proposed, a structural review may need to be completed. Table 6 Fire Station #72 Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 180° 2,448 27.0 35,790 2 180° 902 10.0 13,526 3 270° 240 3.0 4,159 4 270° 179 2.0 2,388 Total 3,769 42.0 55,863 Recommended System 27.0 35,790 The utility meter is located inside the electrical room, which has no space for additional electrical equipment. There is room just outside the electrical room for the installation of additional equipment. There is also a back-up generator on this site. Building voltage is single-phase, 120/240V, and main breaker and enclosure amperage ratings are 400A. . ---PAGE BREAK--- 16 ELC04: Public Works Building/Corporation Yard Site Address: 7450 Schmidt Lane, El Cerrito, CA 94530 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: A1 Annual Energy Usage: 34,793 kWh Maximum System Size: 40 kW-DC Maximum System Output: 51,195 kWh Recommended System Size: 24 kW-DC Recommended System Output: 30,717 kWh Energy Offset: Over 100% possible, 88% recommended Issues: Limited roof space with structural concerns, tree shading, HVAC equipment Opportunities: Vehicle shading, full offset of on-site electrical usage The Public Works Building and Corporation Yard are located on property recently acquired by the City. Usable areas for PV installations are shown in Figure 14. Elevated carports with PV modules mounted on top can be installed within Sections 1 and 2. Section 3 is on top of the main rooftop of the Public Works Building. The red box indicates the location of the site utility meter. Figure 14 Public Works Building and Corporation Yard Usable Areas The lot containing Sections 1 and 2 is used as a parking area for city-owned waste management and maintenance vehicles. Section 2 is on an open-sided storage structure which does not appear to be structurally sufficient for ---PAGE BREAK--- 17 rooftop construction, but could be removed and replaced by a new solar carport. A carport in Section 1 would need to accommodate tall maintenance vehicles, so the carport would need to be fifteen to twenty feet in height. Section 3 is on the flat tar and gravel portion of the rooftop. The size of Section 3 is limited by various pieces of equipment on the rooftop, including cables, pipes, and conduit. Figure 15 shows a large part of Section 3. The remaining rooftop areas are not recommended for installation due to roof age and condition. Figure 15 Section 3 Usable Area A summary of the potential solar production from each section is shown in Table 16 below. The highlighted sections indicate the recommended system size as well as the location of the system. If all three sections are used, 51,195 kWh could be produced annually, which is greater than the site’s current annual usage. Using Sections 1 and 3, a 24 kW-DC system could be built, which would offset over 88% of the energy used at the site and virtually eliminate the electricity bill. This facility is also undergoing lighting retrofits, which will reduce the system size needed to offset usage and electrical payments. In determining preferred sections for PV installation, it should be noted that the use of Section 3 may require a structural review—if found to be structurally insufficient, Section 2 could be utilized as an alternative. Table 7 Corporation Yard Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 240° 1,525 18.0 23,038 2 240° 1,297 15.0 19,198 3 240° 618 7.0 8,959 Total 3,440 40.0 51,195 Recommended System 24.0 30,717 The meter is located on the west-facing external wall of the Public Works Building. Building voltage is single-phase, 120/240V. There is enough space next to the meter for additional electrical equipment. ---PAGE BREAK--- 18 ELC17: Recycling Center Site Address: 7501 Schmidt Lane, El Cerrito, CA 94530 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: A6 Annual Energy Usage: 16,965 kWh Maximum System Size: 119 kW-DC Maximum System Output: 95,950 kWh Recommended System Size: 12 kW-DC Recommended System Output: 15,340 kWH Energy Offset: over 100% possible; 90% recommended (100% with revised load) Issues: Tree shading, Trenching Opportunities: New construction The Recycling Center is currently undergoing renovation. The renovation involves demolition of the existing buildings and a new layout for the campus, as well as expansion into previously unused space. An aerial view of the site design, along with usable areas for PV installation, is shown in Figure 16 below. Figure 16 Recycling Center Usable Areas ---PAGE BREAK--- 19 Based upon the designs provided, a PV system with a maximum size of 119 kW-DC can be installed at this site using a combination of new rooftop and carport arrays. A summary of array sizes and estimated production can be found in Table 8 below. If PV arrays were installed in all the indicated usable areas, over 500% of the energy usage of the site could be produced. A system size of 12 kW-DC is recommended, based upon the historical usage of the site. This system size is recommended by the contractor in order to achieve the stated goal of making the new facility grid-neutral. The final sizing of the PV system may need to be adjusted based on the results of energy modeling to account for energy efficiency upgrades and new electrical loads. Table 8 Recycling Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW DC) First Year Production (kWh) 1 95° 921 6.90 8,430 2 120°-240° 2,761 25.76 33,533 3 150° 285 3.68 4,811 4 150° 2,429 22.77 29,771 5 210° 1,173 15.18 19,405 6 240° 3,706 45.08 57,696 Total 11,275 119.37 95,950 Recommended System 12.00 15,340 Sections 1-4 are shown on the rooftops of several new structures. As new construction, these structures should be designed and constructed to support the additional weight of the solar panels and mounting materials. Sections 5 and 6 are proposed solar PV carports over new parking areas. Parking for trucks is designated within Section 6, so a carport in this section would need to be built taller than the usual nine-foot height. As the facility should be able to reach its goal of grid-neutrality with the installation of solar on already-designed buildings, care should be taken to ensure that the design and construction of those buildings enables installation of optimal-producing solar arrays. Shading issues should be addressed during construction, particularly if a carport is proposed in Section 6, where tall trees stand to the west. ---PAGE BREAK--- 20 ALB03: Community Center and Library Site Address: 1249 Marin Avenue, Albany, CA 94706 Type of PV System: Carport, Rooftop Current PG&E Rate Schedule: A10-S Annual Energy Usage: 151,893 kWh Maximum System Size: 53 kW-DC Maximum System Output: 70,236 kWh Recommended System Size: 53 kW-DC Recommended System Output: 70,236 kWh Energy Offset: 46% Issues: Limited roof space, tree removal, rooftop obstructions, building shading Opportunities: Vehicle shading The Community Center and Library are in adjoining 2-story buildings on the same plot of land. Due to the architectural features of the rooftop of the Community Center and mechanical equipment on the rooftop, only a small portion of the Library rooftop is usable as shown in Figure 17 below. The red box indicates the location of the electrical room in the basement of the Community Center. Figure 17 Community Center and Library ---PAGE BREAK--- 21 Sections 1 and 3 are both on the flat tar and gravel rooftop of the library. The outer perimeter of the building features a 3-foot tall parapet, while the inner parapet around the HVAC equipment rises approximately 8 feet over the roof surface. An elevated carport PV system can be installed within Section 2. The largest tree in the middle of Section 2 has been removed; additional smaller trees will need to be removed or relocated to allow for construction of the proposed carport. Table 9 below shows projected production from each section. Table 9 Community Center and Library Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 172° 850 8.0 10,602 2 172° 3,317 40.0 53,009 3 172° 432 5.0 6,626 Total 4,599 53.0 70,236 Recommended System 53.0 70,236 Two meters are located in the basement of the Community Center; interconnection is proposed for the Community Center, as it is believed that the electricity bill at the Library is not paid by the City. Voltage at the meter is 480/277V, 3-phase, 4-wire, and the main breaker and enclosure amperage ratings are 400A. ---PAGE BREAK--- 22 ALB05: Childcare Center Site Address: 900 Buchanan Street, Albany, CA 94706 Type of PV System: Rooftop, Shade Structure Current PG&E Rate Schedule: A10-S Annual Energy Usage: 38,447 kWh Maximum System Size: 34 kW-DC Maximum System Output: 44,877 kWh Recommended System Size: 26 kW-DC Recommended System Output: 34,510 kWh Energy Offset: over 100% possible, 90% recommended Issues: Tree removal, tree shading, ball hazards, limited roof space Opportunities: Visitor shading, full offset of on-site electrical usage The Albany Childcare Center is located next to a softball field, and the on-site utility meter powers both the buildings and the lights for the field. A majority of the rooftop of the Childcare Center is usable for PV installation, as is the area directly south of the building. Figure 18 highlights the recommended areas of the Childcare Center. A shade structure can be installed in Section 2, which would take the place of, and extend, an existing shade structure. The red box indicates the location of the external utility switchgear. Figure 18 Teen Center Usable Areas ---PAGE BREAK--- 23 A 26kW-DC system is recommended for this site, using both the roof and a new shade structure. Estimated production of a system of this size would be 34,510 kWh, which corresponds to 90% of the electricity usage at this site. Such a system would virtually eliminate the electricity bill. Table 10 below shows a summary of each section. Table 10 Childcare Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 177° 1,327 13.0 17,401 2 177° 1,784 21.0 27,476 Total 3,111 34.0 44,877 Recommended System 26.0 34,510 The softball field adjoining the Childcare Center presents some hazard to the proposed solar arrays from potential foul balls. Maintenance checks would need to be performed regularly to ensure that the panels are not damaged. Tall redwood trees exist to the south of the building, and additional, smaller, trees are located to the west. Some shading may occur, particularly from the west, so tree trimming may be required to allow a PV system to generate electricity at full efficiency. Several small, immature trees exist in the proposed shade structure area; these would need to be relocated to allow for new construction. The new shade structure would provide relief from direct sun for visitors at existing picnic benches and for parents watching children in the adjacent playground. The switchgear at the site is located to the west of the building. Voltage is 3-phase, 120/208V, with main breaker and enclosure amperage ratings of 600A. ---PAGE BREAK--- 24 BER01: Berkeley West Branch Library Site Address: 1125 University Avenue, Berkeley, CA 94702 Type of PV System: Rooftop Current PG&E Rate Schedule: A1 Projected Annual Energy Usage: 55,000 kWh Maximum System Size: 43kW-DC Maximum System Output: 55,000 kWh Recommended System Size: 43 kW-DC Recommended System Output: 55,000 kWh Energy Offset: 100% Opportunities: Net Zero Design The existing 6,200 sq ft building will be replaced with a new Net Zero Energy (NZE) 9,300 sq. ft one-story building that helps the City achieve its Climate Action Goals and complies with all current codes including being seismically safe and fully ADA-accessible. A perspective, along with solar PV installation, is shown in Figure 19 below. Figure 19 West Branch Library This project is optional for vendors to include in their proposals, as it is subject to separate contracting provisions through the City of Berkeley. For more information, consult the following link http://www.ci.berkeley.ca.us/ContentDisplay.aspx?id=5120. ---PAGE BREAK--- 25 Based on the designs provided, a PV system with a maximum of 43 kW-DC can be installed at the site integrating daylight harvesting and PV panels (175) using the rooftop. A system of this size would cover 100% of the energy usage modeled for the site with a target Energy Use Intensity of 20 kBtu/sf-year. A summary of array sizes and estimated production can be found in Table 1 below. Table 1 Berkeley West Branch Library Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 189° 5,250 43.0 55,000 Total 5,250 43.0 55,000 Recommended System 43.0 55,500 As new construction, these rooftops will be designed and constructed to support the additional weight of solar panels and mounting materials. Figure 20 and Figure 21 provide roof top view with shading model for June 21st and December 21st. Figure 20 June 21st Shading Figure 21 December 21st Shading Roof structural details and electrical interconnection information will be made available for solar planning as the project progresses. ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment D Small Bundle Site Assessments ---PAGE BREAK--- 1 SP04: Davis Senior Center Site Address: 1651 Folsom Avenue, San Pablo, CA 94806 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: A1 Annual Energy Usage: 11,781 kWh Maximum System Size: 90 kW-DC Maximum System Output: 112,583 kWh Recommended System Size: 6 kW-DC Recommended System Output: 7,982 kWh Energy Offset: over 100% possible, 68% recommended Issues: Site security for equipment Opportunities: Vehicle shading, full offset of on-site electrical usage, remote generation-bill credit program The Davis Senior Center is a one-story building with a split-level roof composed of composition shingle material. Figure 1 shows the usable areas at this site. The red box indicates the location of the utility meter. Figure 1 Davis Senior Center Usable Areas ---PAGE BREAK--- 2 Solar PV carport systems can be installed within Sections 1 and 2. Sections 3 and 4 are on the rooftop, which is pitched at approximately 16.5°. Sections 3 and 4 are different rooftop levels, with Section 3 about four feet higher in elevation than Section 4. A summary of the production from each section can be found in Table 1. Table 1 Davis Senior Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 105° 2,347 28.0 34,867 2 105° 4,839 56.0 69,734 3 195° 211 3.0 3,991 4 195° 210 3.0 3,991 Total 7,607 90.0 112,583 Recommended System 6.0 7,982 This site is capable of hosting a 90 kW-DC system which would produce 112,583 kWh, over nine times the annual usage at the site. Under a Net Energy Metering agreement, PG&E allows excess production to be credited to the account with a valuation of the production at the same value as usage. However, the utility does not allow monetary credits to be carried over from one year to the next. In essence, a larger-than-necessary system at this site would be generating electricity for the utility company without any monetary compensation for the City. The recommended system size is much smaller: 6 kW-DC. A system of this size would produce about 7,982 kWh, which equates to 68% energy offset. A system of this size, oriented as modeled, would offset nearly all the electricity bill for the building. The meter is located on an exterior wall facing west-northwest. Building voltage is single-phase, 120/240V, with enclosure and main breaker ratings estimated at 200A. There is space for additional electrical equipment next to the meter, but security concerns exist at the site. Equipment would be more secure if placed inside the storage closet which shares a wall with the meter, or if installed on a roof-accessible wall. Under the utility’s Renewable Energy Self-generation Bill Credit Transfer program (RES-BCT), government customers are allowed to partially offset electricity bills at one location using electricity generated at a different location. Currently, this program has not yet been effectively implemented, but the option may be worthy of investigation. A PV system at this site could generate enough energy to allow some monetary bill credits to be applied to energy bills at other City-owned facilities. ---PAGE BREAK--- 3 SP05: Multi-Purpose Building Site Address: 1667 Folsom Avenue, San Pablo, CA 94806 Type of PV System: Rooftop Current PG&E Rate Schedule: A1 Annual Energy Usage: 7,844 kWh Maximum System Size: 13 kW-DC Maximum System Output: 17,297 kWh Recommended System Size: 6 kW-DC Recommended System Output: 7,982 kWh Energy Offset: 102% Issues: Site security for equipment, tree shading Opportunities: Full offset of on-site electrical usage The Multi-Purpose Building is located next to the Davis Senior Center (SP04). Similar to the Davis Senior Center, this building has a split-level rooftop. The smaller rooftop, which is at a lower elevation, is covered with composition shingle material and the larger rooftop area is covered with tar and gravel material with an open- beam ceiling below. Both rooftops are pitched at approximately 16°. The usable areas are highlighted in Figure 2 below. The red box indicates the location of the utility meter. Figure 2 Multi-Purpose Building Usable Areas ---PAGE BREAK--- 4 The recommended system size is 6 kW-DC. Such a system would be capable of producing 7,982 kWh annually, which would offset 102% of the site’s usage. Utilizing all of the available rooftop space would result in a system which would produce over twice the electricity used at this site. Under a Net Energy Metering agreement, PG&E allows excess production to be credited to the account with a valuation of the production at the same value as usage. However, the utility does not allow monetary credits to be carried over from one year to the next. In essence, a larger-than-necessary system at this site would be generating electricity for the utility without any monetary compensation for the City. Table 6 below shows the possible production from each section, as well as the production from the recommended system size. The privately-owned property south of the building has a few trees that may potentially block sunlight from reaching panels installed in Section 1. For this reason, and in order to have space to reach recommended system size, Section 2 is the recommended location for a PV system. Table 2 Multipurpose Building Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 195° 156 2.0 2,827 2 195° 939 11.0 15,077 Total 1,095 13.0 17,904 Recommended System 6.0 7,982 The meter is located on an exterior wall at the rear of the building. Building voltage is single-phase, 120/240V. Main breaker and enclosure amperage ratings are believed to be 200A. There is space on the wall next to the inverter for additional electrical equipment. ---PAGE BREAK--- 5 ELC03: City Hall Site Address: 10890 San Pablo Avenue, El Cerrito, CA 94530 Type of PV System: Rooftop, Carport Current PG&E Rate Schedule: A10-S Annual Energy Usage: 243,840 kWh Maximum System Size: 39 kW-DC Maximum System Output: 49,384 kWh Recommended System Size: 4 kW-DC Recommended System Output: 5,230 kWh Energy Offset: 2% Issues: Limited physical space, building shading, tree relocation Opportunities: Renewable Energy leadership, community development, progress toward reaching Climate Action Plan goad, LEED certification improvement, shade structure for vehicles and asphalt The El Cerrito City Hall is a newly constructed two-story building with approximately 5,000 square feet of roof space. Due to building orientation as well as the cross gable roof design, not all of the roof surface is suitable for a solar photovoltaic (PV) system. The usable areas of the roof and parking lot are shown in Figure 3 below. Those roof areas not demarcated below are available for PV installation, but arrays in those areas would provide sub-par efficiency and production due to roof orientation and shading. The red square indicates the location of the main electrical room on the first floor. Figure 3 City Hall Usable Areas ---PAGE BREAK--- 6 An elevated carport solar PV system can be installed in Section 1. In general, the height of a carport is nine feet, but this can be adjusted to accommodate taller vehicles. Construction of such a carport shade structure would require the re-location of several small trees, all under the height of twenty feet. The parking area south of Section 1 is not usable for a solar installation due to shading issues from new construction proposed in the adjacent lot. Sections 2, 3 and 4 are on different portions of the rooftop, each with a different orientation, or azimuth angle. The azimuth angle has a direct effect on production, as access to solar energy in the Northern Hemisphere is much greater for roofs or arrays oriented to the south, or 180°, than for those facing north, or City Hall Section 4 is oriented to 60°, which would allow for a PV system that would produce energy at about 15-20% lower efficiency than arrays installed on Sections 2 or 3. Generally, such loss of system efficiency is not financially viable, and is not recommended for construction. Roof tilt, or pitch, is also an important determining factor of PV production, with optimal PV system tilt increasing with geographic distance from the Equator. During the site visit, Sections 2 and 3 were inaccessible; therefore, the pitch angle was assumed to be 18°, which is the pitch angle measured at Section 4. Tilt angle for Section 1 was modeled at 10° pitch, which is commonly used for carports. Table 3 below shows a summary of the production from each reviewed roof and carport section. Table 3 City Hall Possible PV System Summary Section Orientation Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 150° 1,627 14.5 18,423 2 240° 828 9.0 11,740 3 150° 1,023 10.5 13,980 4 60° 503 5.0 5,239 Total 3,981 39.0 49,382 Recommended System 4.0 5,230 The building roof was designed and constructed to be solar-ready, with metal standing-seam roof pans enabling PV installation with minimal roof penetrations. Conduit runs have been installed which lead into the main electrical room, and, if necessary, into a secondary electrical room located on the second floor. Limited space in both of these rooms has been reserved for future installation of PV equipment as shown in Figure 4 below. Figure 4 City Hall Electrical Room ---PAGE BREAK--- 7 Current electrical equipment is suitable for a PV system and upgrades will not be necessary. Building voltage is 120/208, 3-phase, 4-wire, and the main breaker and enclosure amperage ratings are 1200A. ---PAGE BREAK--- 8 ELC07: Canyon Trail Clubhouse Site Address: 6757 Gatto Avenue, El Cerrito, CA 94530 Type of PV System: Rooftop Current PG&E Rate Schedule: A1 Annual Energy Usage: 6,503 kWh Maximum System Size: 10 kW-DC Maximum System Output: 13,176 kWh Recommended System Size: 5 kW-DC Recommended System Output: 6,344 kWh Energy Offset: over 100% possible, 98% recommended Issues: Rooftop obstructions Opportunities: Full offset of on-site electrical usage The Canyon Trail Clubhouse building was built in 1966. The 1,640 sq. ft. building is square-shaped with a truncated pyramid roof top. All sides of the tar and gravel rooftop are pitched at approximately 10°. Three of the rooftop quadrants were reviewed for PV installations, as shown in Figure 5. The red box indicates the location of the site utility meter. Figure 5 Canyon Trail Clubhouse Usable Areas ---PAGE BREAK--- 9 As Table 4 shows, not all sections would be needed to reach the target goal of 5 kW-DC, which would offset nearly all on-site electrical usage and virtually eliminate the electricity bill. Sections 2 and 3 are recommended to host the PV system since both of these sections are positioned more favorably towards the sun as compared to Section 1. Table 4 Canyon Trail Clubhouse Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 280° 321 3.5 4,229 2 190° 350 3.0 4,639 3 100° 300 3.5 4,308 Total 971 10.0 13,176 Recommended System 5.0 6,344 A lighting retrofit project is planned for this site which will lead to a decrease in the power consumption. Therefore, the suggested 5 kW-DC system may need to be downsized to match the facility’s energy needs. The utility meter is located on the western wall of the building. Building voltage is single-phase, 120/240V. Main breaker and enclosure amperage ratings are both 100A. There is available space near the meter for additional electrical equipment. A structural review should be conducted to ensure that the rooftop is structurally stable and able to support additional load. During the site visit, it was observed that the rooftop was starting to show some signs of wear and tear. ---PAGE BREAK--- 10 ELC09: Castro Park Clubhouse Site Address: 1420 Norvell Street, El Cerrito, CA 94530 Type of PV System: Rooftop Current PG&E Rate Schedule: A6 Annual Energy Usage: 17,225 kWh Maximum System Size: 4 kW-DC Maximum System Output: 5,289 kWh Recommended System Size: 4 kW-DC Recommended System Output: 5,289 kWh Energy Offset: 31% Issues: Rooftop obstructions, tree shading Opportunities: Tree trimming The Castro Park Clubhouse building was constructed in 1970. The rooftop is made of tar and gravel and is in good condition. The rooftop pitch is approximately 10°. Figure 6 shows the only recommended area on the rooftop, as well as the location of the utility meter. Figure 6 Castro Park Clubhouse Usable Area ---PAGE BREAK--- 11 The size of the usable area for a PV system is limited by the presence of tall trees which are located south and southwest of the building. The widespread tree branches will block sunlight from reaching the PV panels. There are also a few air vents on the rooftop which further limit the usable area, as shown in Figure 7. Figure 7 Castro Park Clubhouse Rooftop Obstructions Due to the small system size in the recommended area, only 31% of the energy usage at this site can be offset by the rooftop PV system. With tree trimming or removal, additional roof areas may be feasible. Table 5 below shows potential output of this recommended PV system. A lighting retrofit project planned for this site will reduce the energy usage, which will increase the energy offset by the PV system. Table 5 Castro Park Clubhouse Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 200° 248 4.0 5,289 Recommended System 4.0 5,289 As an alternative to the rooftop system, a shade structure could be constructed adjacent to the building or over the play area which is located northeast of the building. Such a shade structure could accommodate a PV system larger than 4 kW-DC in order to offset a larger percentage of the energy usage. Because the building is already on an A6 Time-Of-Use rate schedule, any size solar system at this site may be able to provide valuable energy savings. The utility meter is located on the northwest wall of the building. Building voltage is single-phase, 120/240V. There is space next to the meter for additional electrical equipment. ---PAGE BREAK--- 12 ELC10: Fairmont Childcare Center Site Address: 715 Lexington Avenue, El Cerrito, CA 94530 Type of PV System: Rooftop Current PG&E Rate Schedule: A6 Annual Energy Usage: 5,490 kWh Maximum System Size: 7 kW-DC Maximum System Output: 9,092 kWh Recommended System Size: 3 kW-DC Recommended System Output: 3,877 kWh Energy Offset: over 100% possible, 71% recommended Issues: Steep roof pitch Opportunities: Full offset of on-site electrical usage The Fairmont Childcare Center is housed in a one-story building constructed in 1988. Building footprint is 1,400 sq. ft. and the roofing material is composition shingle. The rooftop is pitched at approximately 25°. The recommended area of the rooftop is highlighted in green in Figure 8 below. The location of the utility meter is indicated by the red box. Figure 8 Fairmont Childcare Center Usable Area ---PAGE BREAK--- 13 A 7 kW-DC system can be installed in the usable area. This would produce approximately 9,092 kWh, over 150% of the energy used at this site. Excess energy produced by the PV system is returned to the utility grid and the account is credited for this energy. These credits can be used when the site consumes more energy than it produces. However, PG&E will not allow any unused credits to be carried over from one calendar year to the next. Table 6 shows a comparison between the recommended system size of 3 kW-DC and the maximum 7 kW-DC system. The smaller system would produce approximately 3,877 kWh annually, which would offset 71% of the energy usage at this site and virtually eliminate the electricity bill. The smaller system size is recommended to avoid overproduction, which would not be compensated by the utility. A structural review of the rooftop needs to be conducted to ensure the roof can withstand the additional load of the PV modules and racking system. Table 6 Fairmont Childcare Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 240° 545 7.0 9,092 Recommended System 3.0 3,877 There are a few trees located northeast of the building, but these do not present any shade issues. The westerly orientation of a PV system in the recommended area would not receive much morning sunlight, but would receive substantial sunlight in the afternoon when the value of solar production is greatest under the current A6 Time-Of- Use utility rate schedule. The site meter is located on the outside wall facing the street, just inside the perimeter fencing. Building voltage is single-phase, 120/240V. The main breaker amperage rating is 100A and the enclosure panel is rated at 125A. There is space for additional electrical equipment along the same wall. Upgrades to the electrical equipment will not be needed if a PV system is installed at this site. ---PAGE BREAK--- 14 ELC11: Harding Childcare Center Site Address: 7115 C Street, El Cerrito, CA 94530 Type of PV System: Rooftop Current PG&E Rate Schedule: A6 Annual Energy Usage: 10,193 kWh Maximum System Size: 6 kW-DC Maximum System Output: 7,562 kWh Recommended System Size: 6 kW-DC Recommended System Output: 7,562 kWh Energy Offset: 74% Issues: Ball hazards, tree shading, rooftop obstructions Opportunities: Tree trimming The Harding Childcare Center is a one-story building built in 1965, and it has a 2,526 sq. ft. footprint. The rooftop is made of tar and gravel. The recommended areas of the rooftop for PV installation are highlighted in Figure 9 below. The red box indicates the location of the utility meter. Figure 9 Harding Childcare Center Usable Areas ---PAGE BREAK--- 15 The identified usable roof sections are flat but the rest of the roof is pitched. In between the marked sections are skylights, which limit the usable area, as shown in Figure 10. Figure 10 Harding Childcare Center Rooftop A maximum of 6 kW-DC can be installed on this rooftop, which would produce about 7,562 kWh, equaling 74% of the usage on-site. This level of offset would virtually eliminate the electrical bill. Table 7 shows more information about each section. All three sections will be needed to reach the targeted recommended system size. Table 7 Harding Childcare Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 240° 235 2.0 2,521 2 240° 329 3.0 3,781 3 240° 127 1.0 1,260 Total 691 6.0 7,562 Recommended System 6.0 7,562 North of the building is a softball field. The likelihood of softballs being hit onto the rooftop is low since the batters hit away from the building, though potential foul balls may be a hazard. Northeast of the building are two tennis courts. While these tennis courts are farther away, a few tennis balls were found on the rooftop. Tennis balls may be unlikely to break solar module glass, but maintenance checks will need to be performed regularly to ensure that the panels are not damaged. Due to the tall trees located south and west of the building, there are some shading issues at this site. Figure 11 shows the solar access average for the recommended portions of the rooftop. During the summer months, the trees will block about 10% of the available sunlight, this number increases to 20% during the winter months. On average, this system will only produce about 85% of the expected production. This translates to a lower energy offset and decreased savings on the utility bill. If trees are removed or trimmed regularly over the lifespan of the PV system, this shade issue can be mitigated. ---PAGE BREAK--- 16 Figure 11 Solar Access for Harding Childcare Center The meter is located outside the building on the southern wall, and there is room next to the meter for additional electrical equipment. Building voltage is 120/240V, single-phase. The main breaker and enclosure amperage ratings are believed to be 100A. ---PAGE BREAK--- 17 ELC12: Madera Childcare Center Site Address: 1500 Devonshire Drive, El Cerrito, CA 94530 Type of PV System: Rooftop Current PG&E Rate Schedule: A1 Annual Energy Usage: 7,084 kWh Maximum System Size: 7 kW-DC Maximum System Output: 9,234 kWh Recommended System Size: 5 kW-DC Recommended System Output: 6,540 kWh Energy Offset: 92% Issues: Steep roof pitch Opportunities: Full offset of on-site electrical usage The Madera Childcare Center is a one-story building built in 1988 with a composition shingle roof. Building footprint is 1,440 sq. ft. The green highlighted area in Figure 12 is the recommended area of the rooftop, which is pitched at approximately 24°. The remainder of the rooftop area is not advisable for PV installation due to its northwest orientation. The red box indicates the location of the electric meter. Figure 12 Madera Childcare Usable Area ---PAGE BREAK--- 18 Section 1 is large enough to host a 7 kW-DC system which would produce about 9,234 kWh. This production corresponds to over 130% of the site’s usage. A smaller system size, 5 kW-DC, is recommended, which will offset 93% of the site usage and virtually eliminate the electricity bill. Table 8 below shows the production from Section 1 as well as the production from the recommended system size. Table 8 Madera Childcare Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 136° 603 7.0 9,234 Recommended System 5.0 6,540 Based on the energy reduction from a lighting retrofit project at this site, the recommended system size may need to be downsized to avoid overproduction, The roof appeared to be in good condition but a structural review will need to be performed in order to verify that the roof can support the additional load of the PV modules and racking system. The meter is located on the southwest exterior wall of the building. Building voltage and amperage rating were not determined during the site visit. There is space for additional electrical equipment next to the meter. ---PAGE BREAK--- 19 ALB01: Teen Center Site Address: 1331 Portland Ave., Albany, CA 94706 Type of PV System: Shade Structure Current PG&E Rate Schedule: A1 Annual Energy Usage: 9,727 kWh Maximum System Size: 17 kW-DC Maximum System Output: 22,431 kWh Recommended System Size: 8 kW-DC Recommended System Output: 10,287 kWh Energy Offset: 106% Issues: Clay tile roofing material, tree shading Opportunities: Full offset of on-site electrical usage The Albany Teen Center building rooftop is composed of clay tiles. Due to the brittle nature of clay tiles, it is not advisable to install PV systems on the rooftop. Clay tiles could be removed and replaced with shingle roofing— however, such re-roofing work may be undesirable due to cost or aesthetic considerations. The usable areas for a PV installation can be seen in Figure 13 below. The red box indicates the location of the site’s utility meter. Figure 13 Teen Center Usable Areas ---PAGE BREAK--- 20 PV systems could be installed on existing shade structures in both Sections 1 and 2. Section 2 is not recommended due to distance from the building and site security concerns. Section 1 is within the perimeter fencing of the building and would require no trenching between the solar array and the interconnection point. A summary of the production from each section can be found in Table 9 below. A system using both sections would yield an offset of over 200% of the site’s electrical usage. An 8 kW-DC system is recommended, which is capable of producing enough power to achieve grid-neutral and to virtually eliminate the electrical bill. A system of this size can fit within the marked area of Section 1. Table 9 Teen Center Possible PV System Summary Section Azimuth Area (Sq. Ft.) Size (kW-DC) First Year Production (kWh) 1 182° 1,050 12.0 15,379 2 220° 580 5.0 7,052 Total 1,630 17.0 22,431 Recommended System 8.0 10,287 A shade analysis in Section 1 shows that solar access is over 90% at any time of the year. Some minimal shading would occur from trees at the southeastern corner of the building, but this would not be a factor after the early morning. The existing shade structure in Section 1 is solidly built, but would require a structural study to verify sufficiency to hold additional weight load of a solar array. A building window exists just above the top level of the shade structure, so any solar array may need to be raised approximately 4 feet over the shade structure to minimize view impact. The site utility meter is located on the external north-facing wall of the building. Building voltage is single-phase, 120/240V, and main breaker and enclosure amperage ratings are believed to be 200A. ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment E PV System Design Specifications ---PAGE BREAK--- 1 SMALL CITIES CLIMATE ACTION PARTNERSHIP SOLAR PHOTOVOLTAIC SYSTEM JOINT PROCUREMENT Background of Project and Stakeholders The Small Cities Climate Action Partnership (SCCAP) is a coalition of cities in Contra Costa and Alameda Counties that formed to pursue strategies for reducing the negative environmental impact of City operations. The four participating cities: El Cerrito, San Pablo, Piedmont, and Albany, understand that photovoltaic (PV) installations can reduce the Cities’ reliance on utility-generated energy. By producing on-site power from a renewable and clean source (sunlight), the Cities can reduce their carbon footprints and provide environmental leadership to their citizens and to neighboring jurisdictions. Scope of Work The SCCAP, led by the City of El Cerrito, is requesting bids for the design, procurement of materials, installation, commissioning and all associated documentation and process completion for Solar PV Systems to be located at twenty-four municipal facilities located within the boundaries of the four partner cities. Individual site system sizes range from 3 kW-DC to 200 kW-DC, totaling 1,070 kW-DC. The twenty-four sites are divided into three separate bundles: Large Systems (>100 kW- DC), Medium Systems (10-100 kW-DC), and Small Systems (<10 kW-DC). Bidders may submit proposals for one, two, or all three bundles, but all sites within each individual bundle must be included in the proposal. The SCCAP requires two types of pricing proposals: 1) Contractor Design/Build, with City ownership of PV systems (direct purchase); and 2) Financed Installation, via Solar Lease or Power Purchase Agreement, that would result in minimal to no cash outlay from partner cities. For each financing mechanism, proposals must include the construction of PV systems at all designated sites in the applicable bundle, though each City maintains the right to remove or replace some or all sites from consideration. The awarded contractor shall prepare complete designs, working drawings, specifications and shop drawings for the Project, and shall furnish the services of all necessary supervisors, architects, engineers, designers, draftsmen, and other personnel necessary for the preparation of those drawings and specifications required for the Project. . The awarded contractor shall provide all labor, materials, equipment, tools and supplies required for construction of the Project in accordance with drawings and specifications prepared by the Design/Builder and the Project scope. . The awarded contractor shall supervise and direct the work, and shall furnish the services of all supervisors, professionals, mechanics and other personnel necessary to design and construct the Project. ---PAGE BREAK--- 2 Design Standards General  All power generation and transmission equipment must be UL listed for its designed use  Construction must comply with 2010 California Building Code, which encompasses: o 2006 International Building Code o 2008 National Electric Code (NEC)  Construction must comply with State Fire Marshall installation guidelines o http://osfm.fire.ca.gov/pdf/reports/solarphotovoltaicguideline.pdf  Minimum 10-year warranty for all materials and workmanship  System integrator is responsible for conducting all required building, utility, and rebate inspections, and must complete all construction and documentation in a manner necessary to pass such inspections, and in accordance with industry standard best practices  System integrator must possess current license with California Contractors State Licensing Board to perform work being proposed Modules  System modules shall be UL1703 listed and consist of silicon semi- conducting material  Minimum 5-year warranty for PV module workmanship, with 10-year warranty on minimum of 90% nameplate energy production and 25-year warranty on minimum of 80% nameplate energy production Inverter  Inverters shall be UL1741 listed and must have a CEC-listed efficiency of 95% or higher.  Inverters must carry minimum 20-year warranty. Balance of System  Each proposed PV system shall include, at a minimum, a fused roof-mounted DC disconnect, as well as external fused DC disconnect and AC disconnect at inverter location for safety and maintenance concerns.  String combiner boxes must include properly-sized fusing, and all metal equipment and components must be bonded and grounded as required by NEC.  All system wiring and conduit must comply with NEC stipulations, and all indoor and outdoor wiring, outdoor-rated or otherwise, must be enclosed in EMT or RIGID conduit or covered raceway.  Wall penetrations must be sealed in compliance with NEC and NFPA regulations.  All wiring materials and techniques must adhere to industry-standard best practices, and all inter-module connections must require the use of a specialized tool for disconnecting.  Material requirements: ---PAGE BREAK--- 3 o Fasteners and hardware throughout system shall be stainless steel or material of equivalent corrosion resistance o Racking components shall be anodized aluminum, hot-dipped galvanized steel, or material of equivalent corrosion resistance o Unprotected steel not to be used in any components  Carport design and construction should be included in proposal pricing where applicable, unless noted otherwise in Attachments B and C. Carport structures must include new functional under-canopy lighting and painting of structures, as well as necessary tree and light pole removal and disposal. Interconnection  System interconnection must comply with NEC and PG&E regulations, and must be approved by PG&E and City Building Department before any PV system construction is begun.  Interconnection points will be at facility main switchgear locations, with existing equipment ratings as shown in Attachments.  Emergency back-up generation may exist on-site and must be factored into proposed PV system electrical plans.  All placards required by City, PG&E, and/or California Solar Initiative (CSI) program must be provided and installed according to City and NEC guidelines. Monitoring and Reporting  System monitoring and reporting must comply with CSI program requirements, and must be provided for a minimum of five years.  Monitoring shall include revenue-grade metering of PV system production; building consumption, pyranometer, and ambient air temperature sensor are also required at sites in the Large Systems bundle.  Proposals must include Internet hosting of monitoring with City personnel on-line access, and minimum of one public display kiosk per City in applicable bundle.  System integrator must work with City to determine best location and technique for monitoring communications interconnection.  System integrator will be responsible for providing all required monitoring communications and power wiring and conduit, with City guidance on approved locations. System Design and Permitting  For each site, awarded bidder shall create a construction plan set which includes at a minimum: o Site overview o Detailed array layout with stringing configuration o Carport piers or mounting and racking details o Details of electrical transmission showing conduit routing and location of electrical enclosures, conduit support details, and enclosure mounting details o Electrical single-line diagram o Electrical three-line diagram ---PAGE BREAK--- 4 o Monitoring plan o Construction project plan with timeline  All proposed system designs and construction techniques must be approved by City Project Manager and by City Building Department.  A building permit is required, and must be obtained through normal permitting processes, unless City Project Manager chooses to waive this requirement.  Bidder shall obtain structural PE stamp verifying the integrity of the existing facility to handle additional weight load of proposed PV system  Bidder shall obtain electrical PE stamp verifying the integrity and code compliance of proposed PV system and interconnection with facility  Roof-mounted array layouts shall be designed to provide minimum of 3 feet of walking access around the perimeter of the roof and convenient access to existing roof-mounted HVAC equipment  Final array layouts shall be designed to avoid shading from 9am to 3pm annually. If this shading requirement cannot be strictly met, bidder shall specify the predicted solar access and performance losses.  Wire loss in DC circuits to be < 1.5%  Wire loss in AC circuits to be < 1% PV System Documentation and Process Control In addition to construction requirements listed above, system integrator will be required to:  prepare, maintain, and abide by Site Safety Plan to include, at a minimum, all applicable OSHA workplace safety and Personal Protective Equipment (PPE) requirements  apply for and receive interconnection approval from PG&E for proposed PV systems.  provide Operations & Maintenance training to City staff.  provide ten years of system maintenance, with annual reports of system performance and consistent oversight of system monitoring. o Bidder shall be required to respond to system downtime within 24 hours of first occurrence of incidence. If corrective action is not immediately feasible, bidder shall notify client of action plan and timeline for execution. o Bidder shall be required to respond to warranty related issues not affecting production within 72 hours of notification.  provide As-Built drawings of PV system, which must include finalized module layout and stringing chart. ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment F Direct Purchase Cost Proposal Forms F1: Large Bundle F2: Medium Bundle F3: Small Bundle ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment F1 DIRECT PURCHASE COST PROPOSAL FOR DESIGN/BUILD OF PHOTOVOLTAIC SYSTEM INSTALLATIONS TO: CITY COUNCIL - CITY OF EL CERRITO, CALIFORNIA The undersigned declares that he has carefully examined the Request For Proposals and Addenda, the plans and the specifications as available, including all attachments and/or references therein, and is satisfied as to the field conditions he will encounter and hereby proposes to furnish all materials, labor and equipment and to do all work required to complete the work in accordance with the plans and specifications, for the prices set forth in the following schedule (prices shall include all applicable taxes): LARGE BUNDLE: Bid Item Description Quantity (kW-DC) Quantity (kWh)* Total Price Price Solar photovoltaic system to include all materials, labor, equipment, permits, warranties, and monitoring for: 1 SP01 – San Pablo City Hall 2 SP02 – San Pablo Police Department 3 ELC01 – El Cerrito Public Safety Building 4 ELC 14/15– El Cerrito Community Center Offices and Pools 5 ALB02 – Albany City Hall * kWh forecast shall be for one year and must equal CSI-EPBB calculation based on system size (kW-DC), equipment proposed, and system design. TOTAL BID All items are based on an “in-place” condition. The undersigned further agrees to execute the required contract(s), with necessary bonds, within twenty (20) calendar days of notification that the contracts are ready for signature. Penalty for default shall be forfeiture to the City of El Cerrito of the proceeds of the check or bond accompanying this bid. In case of discrepancy between the item price and the total set forth for the item, the item price shall prevail, provided, however, if the amount set forth as an item price is ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 ambiguous, unintelligible or uncertain for any cause, or is omitted, or in the case of unit basis items, is the same amount as the entry in the “total” column, then the amount set forth in the “total” column for the item shall prevail in accordance with the following: As to unit basis items, the amount set forth in the “total” column shall be divided by the estimated quantity for the item and the price thus obtained shall be the item price. The foregoing quantities are approximate only, being given as a basis for the comparison of bids and the City does not, expressly or by implication, agree that the actual amount of work will correspond therewith but reserves the right to increase or decrease the amount of any class or portion of the work or to omit any portion(s) (this includes complete base bid items) of the work as may be deemed necessary or advisable by the Engineer at the contract price. Price negotiations on the contract prices are optional if the actual amount of work is different from the above estimates by 25 percent or greater. The undersigned is licensed in accordance with the State of California Contractor’s License Law. License No. Class Expiration Date If an individual, so state. If a firm co-partnership, state the firm name and give the names of all individuals or co-partners composing the firm. If a corporation, state legal names of corporation and also names of President, Secretary, Treasurer, and Manager thereof. Under penalty of perjury, I declare that to the best of my knowledge and belief the representations made herein are true, correct and complete. SIGNATURE OF Print or Type Name, Address and Telephone Number: DATED: 2011 ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment F2 DIRECT PURCHASE COST PROPOSAL FOR DESIGN/BUILD OF PHOTOVOLTAIC SYSTEM INSTALLATIONS TO: CITY COUNCIL - CITY OF EL CERRITO, CALIFORNIA The undersigned declares that he has carefully examined the Request For Proposals and Addenda, the plans and the specifications as available, including all attachments and/or references therein, and is satisfied as to the field conditions he will encounter and hereby proposes to furnish all materials, labor and equipment and to do all work required to complete the work in accordance with the plans and specifications, for the prices set forth in the following schedule (prices shall include all applicable taxes): MEDIUM BUNDLE: Bid Item Description Quantity (kW-DC) Quantity (kWh)* Total Price Price Solar photovoltaic system to include all materials, labor, equipment, permits, warranties, and monitoring for: 1 SP03 – San Pablo Church Lane Senior Center 2 PDM01 – Piedmont City Hall and Fire Department 3 PDM02 – Piedmont Veteran’s Building and Police Department 4 PDM03 – Piedmont Recreation Center 5 PDM04 – Piedmont Corporation Yard 6 ELC02 – El Cerrito Fire Station #72 7 ELC04 – El Cerrito Public Works Building/Corporation Yard 8 ELC17 – El Cerrito Recycling Center 9 ALB03 – Albany Community Center and Library 10 ALB05 – Albany Childcare Center 11 BER01 – Berkeley West Branch Library * kWh forecast shall be for one year and must equal CSI-EPBB calculation based on system size (kW-DC), equipment proposed, and system design. TOTAL BID ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 All items are based on an “in-place” condition. The undersigned further agrees to execute the required contract(s), with necessary bonds, within twenty (20) calendar days of notification that the contracts are ready for signature. Penalty for default shall be forfeiture to the City of El Cerrito of the proceeds of the check or bond accompanying this bid. In case of discrepancy between the item price and the total set forth for the item, the item price shall prevail, provided, however, if the amount set forth as an item price is ambiguous, unintelligible or uncertain for any cause, or is omitted, or in the case of unit basis items, is the same amount as the entry in the “total” column, then the amount set forth in the “total” column for the item shall prevail in accordance with the following: As to unit basis items, the amount set forth in the “total” column shall be divided by the estimated quantity for the item and the price thus obtained shall be the item price. The foregoing quantities are approximate only, being given as a basis for the comparison of bids and the City does not, expressly or by implication, agree that the actual amount of work will correspond therewith but reserves the right to increase or decrease the amount of any class or portion of the work or to omit any portion(s) (this includes complete base bid items) of the work as may be deemed necessary or advisable by the Engineer at the contract price. Price negotiations on the contract prices are optional if the actual amount of work is different from the above estimates by 25 percent or greater. The undersigned is licensed in accordance with the State of California Contractor’s License Law. License No. Class Expiration Date If an individual, so state. If a firm co-partnership, state the firm name and give the names of all individuals or co-partners composing the firm. If a corporation, state legal names of corporation and also names of President, Secretary, Treasurer, and Manager thereof. Under penalty of perjury, I declare that to the best of my knowledge and belief the representations made herein are true, correct and complete. SIGNATURE OF Print or Type Name, Address and Telephone Number: ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 2011. ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 Attachment F3 DIRECT PURCHASE COST PROPOSAL FOR DESIGN/BUILD OF PHOTOVOLTAIC SYSTEM INSTALLATIONS TO: CITY COUNCIL - CITY OF EL CERRITO, CALIFORNIA The undersigned declares that he has carefully examined the Request For Proposals and Addenda, the plans and the specifications as available, including all attachments and/or references therein, and is satisfied as to the field conditions he will encounter and hereby proposes to furnish all materials, labor and equipment and to do all work required to complete the work in accordance with the plans and specifications, for the prices set forth in the following schedule (prices shall include all applicable taxes): SMALL BUNDLE: Bid Item Description Quantity (kW-DC) Quantity (kWh)* Total Price Price Solar photovoltaic system to include all materials, labor, equipment, permits, warranties, and monitoring for: 1 ALB01 – Albany Teen Center 2 SP04 – San Pablo Davis Senior Center 3 SP05 – San Pablo Multi- Purpose Building 4 ELC03 – El Cerrito City Hall 5 ELC07 – El Cerrito Canyon Trail Clubhouse 6 ELC09 – El Cerrito Castro Park Clubhouse 7 ELC10 – El Cerrito Fairmont Childcare Center 8 ELC11 – El Cerrito Harding Childcare Center 9 ELC12 – El Cerrito Madera Childcare Center * kWh forecast shall be for one year and must equal CSI-EPBB calculation based on system size (kW-DC), equipment proposed, and system design. TOTAL BID All items are based on an “in-place” condition. ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 The undersigned further agrees to execute the required contract(s), with necessary bonds, within twenty (20) calendar days of notification that the contracts are ready for signature. Penalty for default shall be forfeiture to the City of El Cerrito of the proceeds of the check or bond accompanying this bid. In case of discrepancy between the item price and the total set forth for the item, the item price shall prevail, provided, however, if the amount set forth as an item price is ambiguous, unintelligible or uncertain for any cause, or is omitted, or in the case of unit basis items, is the same amount as the entry in the “total” column, then the amount set forth in the “total” column for the item shall prevail in accordance with the following: As to unit basis items, the amount set forth in the “total” column shall be divided by the estimated quantity for the item and the price thus obtained shall be the item price. The foregoing quantities are approximate only, being given as a basis for the comparison of bids and the City does not, expressly or by implication, agree that the actual amount of work will correspond therewith but reserves the right to increase or decrease the amount of any class or portion of the work or to omit any portion(s) (this includes complete base bid items) of the work as may be deemed necessary or advisable by the Engineer at the contract price. Price negotiations on the contract prices are optional if the actual amount of work is different from the above estimates by 25 percent or greater. The undersigned is licensed in accordance with the State of California Contractor’s License Law. License No. Class Expiration Date If an individual, so state. If a firm co-partnership, state the firm name and give the names of all individuals or co-partners composing the firm. If a corporation, state legal names of corporation and also names of President, Secretary, Treasurer, and Manager thereof. Under penalty of perjury, I declare that to the best of my knowledge and belief the representations made herein are true, correct and complete. SIGNATURE OF Print or Type Name, Address and Telephone Number: ---PAGE BREAK--- City of El Cerrito – Small Cities Climate Action Partnership Solar Procurement Request for Proposals – Attachments A through F3 DATED: 2011.