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RECEIVED AUG 101995 fK .C..QJRACTORS August 9, 199 5 CHANG E ORD ER NO. 3 Project: Wastewater Treatment Plant Sludge Dewatering Facilities 1. Sludge storage area pavement thickness: a. Add 2. 0 inches of asphalt concrete paving to the plan specified depth of 2.0 inches; total depth= 4.0 inches. b. The originally specified thickness was determined to be too light to provide the strength and dura bility necessary to withstand the front end loader use of this space. c. Add . . . . . . . . . $ 3,3 03.72 2. Utility water pump control: a. Add the a bility to control the 2 utility water pumps from the Dewatering Building. b. Originally these pumps could only be turned on/off inside the new Chemical Building. A consensus of the plant's operators (during construction) indicated a need to be a ble to also control these pumps in the Dewatering Building. c. Add . . . . . . . . . . . $ 699.6 7 3. Compressor rack: a. Furnish and install a fa bricated metal rack to elevate the compressor in the Dewatering Building a bove floor level. b. The original design called for the compressor to rest on the floor; however, to more efficiently utilize the buliding space, the compressor needs to be elevated and supported on a rack. c. Add . . . . . . . . . . $ 446.02 4. Door stops: a. Add door stops to the 9 pedestrian doors of the Dewatering and Chemical Buildings. b. This feature had inadvertently been omitted from the original plans and specifications and was added as a necessity. c. Add . . . . . . . . . . . $ 293.99 5. Utility water pump supports: a. Furnish and install two fa bricated steel utility water pump supports. 95-67 ---PAGE BREAK--- b. The original design did not include adequate support for the steel pipe pump cham bers where they penetrate the existing concrete wall of the chlorine contact cham ber. Steel supports were fa bricated to secure the pump chambers to the wall. c. Add . . . . $ 85 7.05 6. Motorized overhead door openers: a. Add two motorized overhead door openers. b. Two lesser used doors were not originally spec'd for motorized openers. These doors are too unwieldy to be routinely hand operated; therefore, the electric openers are needed. c. Add . . . . . . . $ 1,3 5 0.9 0 7. Plant bypass chlorination: a. Furnish and install the piping and valves necessary to chlorinate the plant's bypass during emergency operations. b. The original plans did not include the provision to chlorinate the plant's bypass system - which provision is a "must", according to E PA regulations. The old chlorination system that is being replaced did have such provision. c. Add . . $ 42 7.79 8. Analyzer drain lines: a. Furnish and install drain lines for the discharge of the S02 and CL2 analyzers. b. The original plans did not include a way to drain the discharge of the S02 and CL2 analyzers to waste. Additional plum bing was required. C. Add . . . . $ 513.29 9. Protective bollards: a. Construct two bollards in front of the new main drain pump station and two in front of the sludge conveyor. b. These bollards are necessary to deter equipment damage in these highly trafficked areas. This work was not included in the original plans. c. Add . . $ 805.43 1 0. Sludge pump/polymer system interlock: a. Provide an interlock such that if one fails the other shuts down, automatically. b. This feature was not included in the original scope of work but is needed to protect the system if there are equipment malfunctions. c. Add . . . $ 619.51 11. Main drain pump station light: a. Furnish and install a light for the inside of the station enclosure. ---PAGE BREAK--- b. Plans had not called for a light but one is needed to allow viewing of the compartment's interior during nighttime. c. Add $ 131.73 12. Sludge storage building column protection: a. Construct 3-foot dia. by 5-foot high cast-in-place concrete encasements at the bases of 12 steel building support columns. b. These encasements protect the columns from damage from the front end loader that will be operating near the columns. This feature was not included in the original scope. C. Add . . $ 2,134.99 13. Flap valve for drain line from utility water valve vault to main drain pump station: a. Furnish and install a 6" flanged flap valve on the floor drain line out of the utility water valve vault to the main drain pump station. b. This "check" type valve prevents high water in the main drain pump station from backing into the valve vault - which situation would occur only if the main drain pumps fail to operate automatically due to a malfunction. This feature was not included in the original scope. c. Add $ 28 7.22 14. Chemical building light fixture relocation: a. Relocate an outside "night-light" fixture on the west side of the chemical building. b. The light from this fixture as it was originally installed, as per plan, was blocked by the intake fan structures for both the S02 and CL2 rooms. A move was necessary for the light to be effective. c. Add $ 1 08.81 1 5. Footing modification for sludge storage canopy: a. Add pier height to 1 0 of the cast-in-place concrete footings for the sludge storage canopy. b. These footings needed to be modified to "fit" the existing concrete walls of the existing sludge storage area - over which the new canopy is constructed. The originally specified footings could not accommodate the irregularities of the old wall. c. Add . $ 741.36 EXISTING CONTRACT AMOUNT (PER C.O. $1,646,208.07 NET CHANGE IN PRICE, THIS CHANGE ORDER $ 12,721.48 REVISED CONTRACT AMOUNT. 6 5 8,929.5 5 ---PAGE BREAK--- City of Moscow, Idaho: Mayor C1ty Clerk Kimball Engineering: Project Engineer