RES 99074 - Laserfiche WebLink

unannounced site inspections, are empowered to levy considerable fines if it is determined that the SWPPP has not been properly prepared and implemented. Erosion and Sediment Control. Best Management Practices (BMPs) designed to reduce ero- sion of exposed soil may include, but are not limited to: soil stabilization controls, watenng for dust control, perimeter silt fences, placement of hay bales, and sediment basins. The potential for erosion is generally increased if grading is performed during the rainy season as disturbed soil can be exposed to rainfall and storm runoff. If grading must be conducted during the rainy season, the primary BMPs selected shall focus on erosion control to keep sediment on the slopes. End-of-pipe sediment control measures (e.g., basins and traps) shall be used only as secondary measures. If hydroseeding is selected as the primary soil stabilization method, then slopes shall be seeded by September 1 and irrigated to ensure that adequate root development has occurred prior to October 1. Entry and egress from the construction site shall be carefully controlled to minimize offsite tracking of sediment. Vehicle and equipment wash down facilities shall be designed to be accessible and functional both during dry and wet conditions. Post-Construction Storm Water Management. This refers to measures taken to prevent storm water pollution associated with post-construction activities at the developed site. Because the project includes relatively low-density development, it may be practical for the design of the residential development areas to include "no net gain" in stormwater runoff from the site. Large single-family home lots generally provide many opportunities for stormwater management, including unit pavers on sand patios, concave lawn/infiltration basins, and dry-wells connected to roof downspouts. BMPs required in the SWPPP and grading plan requirements described in Impact 4.3-1 would effectively reduce or eliminate increased erosion while mitigating potential impacts related to sediment transport from residential development sites on nanoff water quality. However, these requirements do not specifically address the potential erosion and sedimentation impacts associated with vineyard or other crop development and operations. The grading plan requirement discussed in Impact 4.3-1 would address the potential impacts of erosion and sedimentation associated with vineyards and other crops. SIGNIFICANT EFFECT Impact 4.3-3: Agricultural Chemical Use. The development and operation of vineyards and other possible crops and orchards within the project site could result in the discharge of agricultural chemicals to surface and subsurface waters potentially causing water quality degradation. This would be considered a potentially significant project impact. Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential hydrology and water quality impacts to a less-than-significant level: Mitigation Measure 4.3-3: Agricultural Chemical Use. Each individual vineyard or other crop owner of agricultural land shall be responsible for the preparation of an Integrated Pest Management Vineyard Avenue Corridor Specific Plan Draft EIR -13- Findings