SU0013754 - Laserfiche WebLink

Home Browse Search

PotentiallyLess Than Less Than Significant Significant with Significant No g Mitigation g Impact Incorporated Impact Impact X. Hydrology and Water Quality. Would the project: a) Violate any water quality standards or waste discharge requirements or otherwise substantially ❑ 11 ❑ degrade surface or ground water quality? b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge ❑ ❑ ❑ ❑ such that the project may impede sustainable groundwater management of the basin? c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the ❑ El11addition of impervious surfaces, in a manner which would: i) result in substantial erosion or siltation on-or off- ❑ ❑ ❑ site; ii) substantially increase the rate or amount of surface runoff in a manner which would result in ❑ 1:11:1flooding on-or off-site; iii) create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide ❑ 1111substantial additional sources of polluted runoff; or iv) impede or redirect flood flows? ❑ ❑ ❑ d) In flood hazard, tsunami, or seiche zones, risk F] F] F]release of pollutants due to project inundation? 13 e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater ❑ El ❑ management plan? Impact Discussion: a) Less-than-Significant Impact. Construction of the Project would include earthwork activities that could potentially result in erosion and sedimentation, which could subsequently degrade downstream receiving waters and violate water quality standards. Stormwater runoff during the construction phase may contain silt and debris, resulting in a short-term increase in the sediment load of the municipal storm drain system. Substances such as oils, fuels, paints, and solvents may be inadvertently spilled on the Project site and subsequently conveyed via stormwater to nearby drainages, watersheds, and groundwater. For stormwater discharges associated with construction activity in the State of California, the State Water Resources Control Board (SWRCB) has adopted the General Permit for Storm Water Discharges Associated with Construction and Land Disturbance Activities (Construction General Permit)to avoid and minimize water quality impacts attributable to such activities. The Construction General Permit applies to all projects in which construction activity disturbs 1 acre or more of soil. Construction activity subject to this permit includes clearing, grading, and disturbances to the ground, such as stockpiling and excavation. The Construction General Permit requires the development and implementation of a SWPPP, which would include and specify water quality BMPs Enter oroiect#s. —Initial Study 22