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APPENDIX A: MITIGATION MONITORING AND REPORTING PROGRAM <br />'Mitigation Measure <br />distance from the top of the existing creek banks as determined by the <br />City and per the requirements of Zoning Ordinance Section 32.12. <br />m) Consideration shall be given to biotechnical creek bank stabilization <br />methods and limiting surface water runoff into the creek. <br />n) Install a subdrain system of perforated pipe and permeable drain rock <br />or gravel as needed to mitigate potential springs that could occur <br />during the winter. Subdrains shall be installed where seepage is <br />observed, and a conceptual subdrain plan shall be prepared once <br />grading plans have been finalized. <br />o) A geotechnical engineer shall be on site during or just following heavy <br />rainstorms to evaluate and map the locations of springs on the site, <br />and provide recommendations for mitigatingiee the adverse impacts of <br />springs or seeps, if necessary. <br />p) The shallow landslide area on Lots 14 and 15 shall be completely <br />removed down to bedrock, and the grade rebuilt with a keyed and <br />benched engineered buttress fill containing subdrains. <br />q) Further evaluation of the questionable landslide near the bottom of <br />Lots 3 and 4 shall be performed during the design -level geotechnical <br />investigations for Lots 1 through 4 to provide detailed <br />recommendations for keyways, benching, and subdrains. The design - <br />level geotechnical investigation shall determine whether mitigation is <br />needed to reduce the potential for damage to the planned site <br />improvements and the potential for adversely affecting neighboring <br />properties. <br />r) The bottom of the bio -retention basins on Lots 5, 7, 8, 9, and 10 shall <br />be lined with HDPE liner to limit water infiltration into the native soils <br />below the permeable filter soils. A subdrain shall be installed above the <br />HDPE liner to intercept the excess water and direct it to a suitable <br />discharge point. The specific recommendations for the HDPE liner <br />system and subdrains shall be presented in the design -level <br />geotechnical report. <br />s) The outfall for the bio -retention basins shall release the discharge near <br />the base of the seasonal creek and shall not be allowed to flow over <br />the top of the creek banks. <br />Laurel Way Planned Development Revised Final EIR <br />February 2013 <br />Impleeiantation/ I Monitoring Entity lit+plementatlon <br />Monitoring Method I Schedule <br />A- <br />