1987-Annual Town Report - Laserfiche WebLink

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f materials are proposed to be handled, stored or the case of a water supply, the loading rate which disposed and a determination of whether or not such would produce nittrate-nitrogen levels in excess of materials will have any impact on public health or five(5)parts per million.Where the per-acre loading safety. rate from the proposed project will equal or exceed t. c. Whether or not the development will cause any the critical loading rate when combined with existing runoff of roadway drainage,or runoff of sediment and potential development within the recharge area due to erosion,into any surface water body,water- of the water body or water supply well, the Report course or wetland and if it will adversely affect any shall specify measures to reduce nutrient loading fishery, shellfish bed or other wildlife or aquatic such as sewage treatment, reduction of development density, elimination or reduction of lawn areas and vegetative resources. - � L• d. A determination of the levels, in total pounds and other appropriate measures. in pounds-per-acre, of nitrogen and phosphorous 6.5.3 which could be generated by the development. In No Definitive Subdivision Plan or Special Permit sub- making such determination, the following standards ject to the provisions of Section 6.5 may be approved shall be used unless the applicant demonstrates to by the Planning Board unless it has determined, after the satisfaction of the Board that other standards reviewing the Water Quality Report and any comments are applicable: from the Board of Health, that the proposed project will not have a significant adverse affect on public 1. Loading per person: 5 lbs. nitrogen per person health or safety, aquatic vegetative resources, any j per year; .25 lbs.phosphorus per person per year. fisheries or shellfish beds or other wildlife due to hazar- Persons per dwelling unit = 3. dous or toxic materials,roadway drainage or sedimen- 2. For commercial and industrial developments, tation or excessive nutrient levels. Where feasible, the nitrogen and phosphorous calculations shall be Board shall ensure that the nutrient contribution of the derived from expected waste water generation as proposed development,when added to the existing and specified by Title V of Mass. General Laws potential nutrient level of other development and Chapter 21A, Section 13. acreage within the specific recharge area, will not 3. Loading from lawn fertilizer: 3 lbs.nitrogen per result, on apounds-per-acre basis, in nutrient levels 1000 square feet per year(with a minimum of 15 that exceed the receiving surface waters' critical � lbs.per lot in a single-family subdivision), .17 lbs. eutrophic level or, in the case of well recharge areas, phosphorous per 1000 square feet per year(with nitrate-nitrogen concentrations in the well in excess of a minimum of.85 lbs. per lot in a single-family five(5)parts per million. It shall be the responsibility r! subdivision). of the applicant to demonstrate that any proposed miti- 4. Loading from road runoff: .38 lbs. nitrogen per gating measures required to produce a negative deter- road mile per day; .12 lbs.phosphorous per road mination regarding the above items will work as de- mile per day. signed,and the Planning Board may require,as a con- e. The existing condition of the receiving water body, dition of any approval, that the applicant or his suc- or water supply (existing or proposed), including cessor demonstrate on an annual basis that said miti- physical characteristics and water chemistry. gating measures are operating satisfactorily.The Board Measurement of existing surface watr quality must may also require the submission of an appropriate per- be completed during summer(peak population)con- formance bond to guarantee satisfactory operation of ditions. Measurements shall specifically include con- said mitigating measures. centrations of total phosphorous in fresh water Submitted by Town Planner bodies and total nitrogen in salt water bodies. Recommended by Planning Board f. The expected change in the condition of the water . body or water supply as a result of the proposed ARTICLE 14:To see if the Town will vote to amend the development. Zoning By-Laws by deleting the existing Sections 6.2, g. The comparison, on a total pounds and a pounds- 6.2.1 and 6.2.2 and replacing them with the following: per-acre basis,of the total nutrient loading from the "6.2 proposed development with the existing and poten- A use listed in Section 6.3 is permitted as of right in tial loading from all other developments and acreage any district under which it is denoted by the letter"Y" within the recharge area(under existing basic zon- subject to such requirements as may be specified else- ing) of any receiving surface water body or water where in this By-Law. supply well. A use which is denoted in Section 6.3 by the letters h. A comparison, on a per-acre basis, of the total "PR"may be permitted as of right subject to the pro- nutrient loading from the proposed project with the visions of Subsection 6.2.1 and to such other re- a loading rate which would be expected to produce quirements as may be specified elsewhere in this By- r critical eutrophic levels in a water body(.02 mg/litre Law. total phosphorous in fresh water bodies, .75 A use which is denoted in Section 6.3 by the letters"SP" mg/litre total nitrogen in salt water bodies) or, in is permitted as a special exception only if a Special Per- - 69 - ��`