PR0535342 - Laserfiche WebLink

Home Browse Search

During excavation and removal activities, an on-site groundwater production well will be developed and used temporarily to provide water supply for dust control. Well production rates are not anticipated to result in a significant lowering of the local groundwater table. C. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, in a manner which would result in substantial erosion or siltation on or off-site. Less Than Significant Impact. Implementation of the proposed remedial action plan will not cause short-term or long-term alterations to existing drainage patterns. The Site is a closed basin; therefore, surface water runoff will not be discharged from the Site during or following project implementation. However, the project may result in the exposure of bare soils following excavation activities on-site; if heavy precipitation were to occur during this period there is potential for some siltation to occur within the boundaries of the Site. This is considered a minor potential impact and is consistent with the Site's previous use as a gravel mine. d. Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river, or substantially increase the rate or amount of surface runoff in a manner that would result in flooding on or off-site. No Impact. Implementation of the proposed remedial action plan will not cause any short- term or long-term alterations to existing drainage patterns. There will be no runoff discharged from the Site during or following project implementation because the Site is a closed basin with no outflow drainage. e. Create or contribute runoff water which would exceed the capacity of existing or planned storm water drainage systems or provide substantial additional sources of polluted runoff. No Impact. Runoff rates will not be affected by the proposed project because the project does not involve site development. Implementation of the proposed remedial action plan will not cause any short-term or long-term alterations to existing drainage patterns. The Site is a closed basin and there will be no runoff discharged from the Site during or following project implementation. f. Otherwise substantially degrade water quality. No Impact. Implementation of the proposed remedial action plan will not cause short-term or long-term water quality or hydrology impacts. The removal of waste and light misting with water for dust control is anticipated to introduce little water to the ground surface. The groundwater quality at the Site is not anticipated to degrade under these circumstances. The Site is a closed basin and there will be no runoff discharged from the Site during or following project implementation. See discussion under question a. above. g. Place within a 100-year flood hazard area structures which would impede or redirect flood flows. No Impact. Although the southwest portion of the project site is located within the 100- year flood plain, according to the Federal Emergency Management Agency Flood Insurance Rate Map, implementation of the proposed remedial action plan will not cause short-term or long-term alterations to existing drainage patterns or result in the development of any structures that would impede or redirect flood flows. The existence of the 100-year flood plain at the site will not affect project activities. Temporary field trailers will be established in the northeast corner, outside of the 100-year flood plain. 34