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8-19= Drainaqe of Springs, Streams and Fill~ <br /> <br /> A. The project geotechnical engineer shall provide <br /> recommendations for controlling drainage from springs or <br /> streams. In particular, subsurface drainage shall be <br /> provided for all springs or streams which will be covered <br /> by fill. <br /> <br /> B. Subsurface drains shall be placed under all fills <br /> proposed on the site. The bases of the fills shall be <br /> drained with either a series of trench drains forming a <br /> herringbone pattern or with a blanket drain which <br /> underlies the entire fill. These drainage systems shall <br /> discharge into the storm drainage system. Also, trench <br /> drains shall be placed across all valleys on-site where <br /> the valley trends off-site. Each trench drain shall be <br /> placed perpendicular to the centerline of the valley and <br /> shall be located near the subdivision boundary. These <br /> trench drains shall be 5 to 10 feet deep. The purpose of <br /> the trench drains placed across the valleys near the <br /> subdivision boundaries is to reduce the amount Qf <br /> groundwater flow onto adjacent properties. % <br /> <br /> 8-20: Groundwater - Relation to Surface Drainaq~ <br /> <br /> The surface drainage system for the development as a whole <br /> shall be evaluated by the geotechnical engineer and <br /> engineering geologist in order to determine the effects of the <br /> surface drainage system on the groundwater regime at the site. <br /> <br /> 8-21: Other Groundwater Considerations <br /> <br /> The developer shall provide a pamphlet to individual <br /> homeowners cautioning against over-irrigating landscaping <br /> areas. Excessive irrigation water is a common cause of <br /> groundwater seepage problems. <br /> <br />9. NOISE <br /> 9-1~ Noise Barriers to Minimize Traffic Nois~ <br /> <br /> A. The applicant shall construct a noise barrier to the <br /> standards proposed on Figure 9-2 of the EIR to mitigate <br /> outdoor noise levels to an L~ of 60 dB or less. This <br /> mitigation measure shall be coordinated with Mitigation <br /> Measure 5-4. <br /> <br /> Page 15 of 19 <br /> <br /> <br />