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<br />8-19: Drainaae of SDrinas. streams and Fills <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 5to 10 feet deep. The purpose of <br />the trench drains placed across the valleys near the <br />subdivision boundaries is to reduce the amount of <br />groundwater flow onto adjacent properties. <br /> <br />8-20: Groundwater - Relation to Surface Drainaae <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 /> <br />9-1: Noise Barriers to Minimize Traffic Noise <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 Ldn 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 />11 <br /> <br />. <br />