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' Stantec <br /> ' L & M OPERABLE UNIT-THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY, <br /> AND GROUNDWATER MONITORING REPORT <br /> Introduction <br /> October 27, 2010 <br /> by a sand/silty sand layer extending to approximately 92 ft bgs. This stratum is a water-bearing <br /> zone identified as the C-Zone. Below this sand layer, imbedded clays and silts are encountered <br /> to a depth of approximately 115 ft bgs, underlain by a sand/silty sand layer with some imbedded <br /> clay to a depth of approximately 130 ft bgs. This stratum is designated as the D-Zone. Clay and <br /> silt is encountered below this sand layer to a total depth explored of 140 ft bgs. <br /> Groundwater beneath the Site is influenced by the Stockton Channel to the north and the <br /> Mormon Slough to the south. The regional groundwater flow direction for the shallow and <br /> ' deeper groundwater bearing zones is generally to the east-northeast. <br /> 1 <br /> 1 <br /> ' IATde terlTN Stockton(Parml2A-0415)\Reports%QMRM10ZQ10\0G10QSSRQRSRQMR StocktonFINAL.doc 1.9 <br />