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Sec. 20. No name pond conservation overlay district (LC). Statement of purpose. The purpose of the no name pond conservation overlay district is to protect the water quality of no name pond by controlling the discharge of surface runoff into the lake, thereby limiting nutrient loading to levels which will not result in substantial degradation of the pond's water quality. Applicability. The standards of the no name pond conservation overlay district shall apply to any land located within the watershed of no name pond which discharges surface water either directly or indirectly to no name pond, as shown on the Official Zoning Map, City of Lewiston. These standards shall apply in addition to the standards of the underlying zoning district in which the property is located. Permitted uses. Any use permitted by right in the underlying zoning district shall be permitted in the no name pond conservation overlay district. Conditional uses. Any use permitted with a conditional use permit in the underlying zoning district shall be permitted as a conditional use in the No Name Pond conservation overlay district. Prohibited uses. Any use prohibited in the underlying zoning district shall be prohibited in the No Name Pond conservation overlay district. Space and bulk standards. Any building, structure or use of land within the no name pond conservation overlay district shall comply with the following requirements in addition to the space and bulk regulations of the underlying zoning district: TABLE INSET: Additional standards. Any building, structure or use of land within the no name pond conservation overlay district shall comply with the following requirements: Fertilizer use: a. The use of fertilizers within the required shoreline, stream or drainage course buffers is prohibited. b. The use of solid chemical fertilizers for agricultural or other nondomestic purposes is prohibited. c. The use of liquid chemical fertilizers or manure for agricultural or other nondomestic purposes shall be done in accordance with a fertilizing plan approved by the District Conservationist of the Androscoggin Valley Soil and Water Conservation District. This plan shall be filed with the code enforcement official at least 48 hours prior to application of any fertilizer. ---PAGE BREAK--- A plan for a year-long or similar time period may be submitted to the code enforcement official to avoid having to file a separate plan for each application. The total area of any lot devoted to lawns and gardens shall not exceed 30 percent of the total area of the lot. Any lot exceeding this requirement as of January 9, 1988 shall be permitted to retain all existing lawn and garden areas. No new lawn or garden area shall be established within the required shoreline, stream or drainage course buffers. Private sewage disposal systems: a. For all proposed on-site sewage disposal systems within the no name pond conservation overlay district and within 250 feet of the shoreline of no name pond, the minimum separation distance required by the applicable state subsurface wastewater disposal rules, between the disposal area bottom and the most limiting soil or groundwater condition (seasonable high groundwater table, restrictive layer or bedrock), must be increased by a factor of 1.5. b. For all proposed on-site sewage disposal systems within the no name pond conservation overlay district within 1,000 feet but greater than 250 feet of the shoreline of no name pond, the minimum separation distance required by the applicable state subsurface wastewater disposal rules, between the disposal area bottom and the most limiting soil condition, must be increased by a factor of 1.25. c. The installation of any on-site sewage disposal system within 250 feet of the shoreline of no name pond, any perennial or intermittent stream tributary to no name pond or any open stormwater drainage course shall comply with the above standard and all the other requirements of the applicable state subsurface wastewater disposal rules without variance. d. The installation of any on-site sewage disposal system with a design capacity in excess of 1,000 gallons per day shall be permitted only if a detailed groundwater hydrology study, acceptable to the city engineer, demonstrates that the system will not have an adverse impact on the water quality of no name pond. e. Replacement or reconstruction of lawfully-existing private residential sewage disposal systems in existence and in use on the effective date of this ordinance and systems on lots in subdivisions approved prior to the effective date of this ordinance, shall not be subject to the requirements of subsections (3)a and (3)b, but shall be required to comply with the applicable requirements of the state subsurface wastewater disposal rules. Proposals for the development of all new or existing lots within the no name pond conservation overlay district, including single-lot residential development, shall comply with the following additional requirements as part of the approval of the project: a. The applicant shall demonstrate, using methodology approved in ---PAGE BREAK--- advance by the Maine Department of Environmental Protection, that the proposed development will incorporate appropriate stormwater best management practices based on standards to assure that development within the watershed will not increase the total phosphorous concentration of no name pond by more than 0.75 part per billion. If the analysis demonstrates that this standard will not be met, the applicant shall propose modifications to the plan to bring the project into conformance with the standard. b. The applicant shall demonstrate, using the soil conservation service methodology for small urban watersheds for a 25-year, 24-hour storm, that the total volume of stormwater discharged from the site in its post development condition shall not exceed the total runoff in its predevelopment condition by more than 20 percent. If this analysis demonstrates that this standard will not be met, the applicant shall propose modifications to the plan to retain runoff on the site to bring the project into conformance with the standard. c. The applicant shall prepare an erosion and sedimentation control plan to minimize, to the maximum extent possible, the discharge of sediments to no name pond. This plan shall be consistent with the practices set forth in the most recent edition of the Environmental Quality Handbook - Maine, published by the Maine Soil and Water Conservation Service and shall be reviewed and approved by the District Conservationist of the Androscoggin County Soil and Water Conservation District. Projects within the no name pond conservation overlay district that include one acre or more of disturbed area, must comply with the Maine Stormwater Management Law, 38 MRSA Section 420-D, and any regulations issued thereunder, specifically Rules 500 and 502, having an effective date of December 31, 1997, repealed and replaced on November 16, 2005, and further amended on December 21, 2006. Furthermore, all projects within 250 feet distance from the normal high water line from no name pond must meet the standard under article XII, shoreland area standards. Conflicts. In any case in which a provision of article XI, section 20 conflicts with provisions contained in other articles of this Code, the more stringent standard shall apply. (Ord. No. 92-5, 3-5-92; Ord. No. 00-19, 10-5-00; Ord. No. 02-24, 2-6-03; Ord. No. 06-17, 2-8-07; Ord. No. 08-08, 10-2-08) Editor's note: See editor's note at article XI.