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Jennifer Jgtlsy . <br /> April i 201.4 <br /> r <br /> .y F rsr ,: <br /> 4 <br /> 1 � y <br /> R + <br /> t K <br /> f f } <br /> ,a1 t' t� ` t rt a <br /> v <br /> ti i 3 5 <br /> AlWE <br /> , <br /> rraelhcfds;thd# wi t E ett�{�1�yr dtc i t ess it cteas�ra ,y.�Vere r rof of g�t'�ghat <br /> tray develop SU�h cnteraa#rrtrst matey fior a givt;n s'Parertty��d#fie of e1it���fo�; <br /> -- uvha#tsest managementr #leka wig(tie ertso +ed t each 1ey-4,61, as tri^the ftaili?Wirlg <br /> example: "erosion of rips gt ea#er in dross se1.ction th in 5 spire ingkies ex�eeing 5 <br /> feef in length will be arrested by placement of graded;rock interceptors or straw <br /> bales to slow concentrated runoff within 1 week following any rainfall;event." Similar <br /> criteria should be,adopted'to trigger erosion control treatments at several stated <br /> levels of erosion that may possibly occur. <br /> 7. A copy of the current Waste Discharge Requirements (WDR's) approved by the <br /> Regional Water Quality Control Board should be attached to the reclamation plan <br /> and the updated WDR's made available for the annual inspection. <br /> 8. The geotechnical analysis should be augmented to demonstrate how ground water <br /> effects on slope stability were assessed. The report states that perched ground <br /> water was encountered at an 80-foot depth and a later hydrology study indicated <br /> similar depths to water over the entire site. A discussion of the Delta Mendota <br /> Canal, and its possible effect on slope stability should also be discussed in the <br /> report. Finally, the report should discuss the setback requirements for the canal, <br /> the PG&E easement, Highway 132 and the property boundaries. <br /> The slope stability analysis should be based on mechanical tests of representative <br /> on-site materials. A discussion of how material below the groundwater elevation will <br /> be compacted to 85% of maximum density, as presumed in the analysis. The <br /> fluctuation in groundwater elevations should be considered, and the relationship <br /> between a perched aquifer and the regional ground water levels should be <br /> explained. Seasonal variation in water levels, stabilization of water levels in test <br /> borings and long term ground water trends should be considered. <br /> The geotechnical report should discuss whether or not collapsible soils will be <br /> encountered and how they will be treated and should also discuss possible <br /> liquefaction effects under seismic conditions and local subsidence. The slope <br /> _ <br />