RES 06035 - Laserfiche WebLink

Draft Environmental Impact Report Bernal Property Phase II Specific Plan Operation Period Impacts New construction and intensified land uses at the project area would result in increased vehicle use and potential discharge of associated pollutants. Leaks of fuel or lubricants, tire and brake pad wear, and fallout from exhaust contribute petroleum hydrocarbons, heavy metals, and sediment to the pollutant load in runoff being transported to receiving waters. Runoff from landscaped areas and sports fields may contain residual pesticides and nutrients. Animal waste from any areas used for stock raising (e.g., from the potential agriculture club), if improperly managed, could pollute runoff. Long-term degradation of the quality of runoff from the site could impact the quality of receiving waters. The City of Pleasanton recognizes that impacts related to water quality degradation could occur as a result of the type of development proposed. Therefore, the Specific Plan specifies that all projects under the plan will fully comply with Countywide National Pollutant Discharge Elimination System (N PDES) permit and City ordinance. The proponent of each grading component within the Plan area that disturbs more than one acre of land will be required to prepare a Stormwater Prevention Plan (SWPPP) designed to reduce potential impacts on surface water quality through the construction period of the project. It is not required that the Swppp be submitted to the Regional Water Quality Control Board (RWQCB), but it must be maintained onsite and made available to City and RWQCB staff upon request. The SWPPP would provide measures to mitigate potential water quality impacts associated with Plan implementation during grading and construction operations. Water quality would be protected by designing the potential agriculture club to channel animal waste to the City's sanitary sewer, or to otherwise manage that waste to avoid its pollution of runoff. As described under c.1 above, it is required that all projects in the Plan area fully comply with the C.3 N PDES permit requirements. These permit provisions include requirements for addressing stormwater quality during the operation phase of the project. In general, passive, low-maintenance BM Ps ("best management practices," in this case, for example, bioswales, porous pavements, and stormwater planters) are preferred. As stated in the Specific Plan, the detention basins (and all other water quality features) would be designed and sized in accordance with the County NPDES permit C.3 requirements for water quality treatment by a civil engineer. Therefore, enforcement of existing regulations would be adequate to mitigate potential impacts on stormwater quality. No adverse environmental impacts relating to surface water quality would occur because the Specific Plan contains adequate provisions to mitigate these potential impacts. (3) Degradation of Groundwater Resources It is possible that, under the proposed project, the existing onsite detention basins would be expanded. One function of these basins is to treat stormwater in compliance with NPDES requirements. Stormwater from parking lots, roadways, and sports fields may contain urban-type pollutants. These pollutants could infiltrate through the bottoms of the basins and eventually reach the water table, degrading groundwater quality. 90