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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 />I:\Tidewater\TW Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 1.9 <br />