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Ms Vicki McCartney Project No 8800401A 0201 <br /> October 26, 2004 `t <br /> Page 4 ��l <br /> � 1 <br /> Figures 5, 6, and 7 illustrate the extent of the MtBE plume beneath the subject site based <br /> on recent groundwater monitoring well analytical data Given the depth-to-water near <br /> the base of the upper sand at 15 feet bgs, and no detectable MtBE in groundwater below <br /> 30 feet bgs, the sand located between approximately 28 to 4,9 feet bgs appears to be the <br /> main migratory pathway downgradient of the site Appendix A contains current and <br /> 0,1 e <br /> histoncal groundwater chemical analytical data <br /> IOn August 12, 2004, depth to groundwater in wells at the site ranged from 14 05 feet <br /> below top of casing (btoc) In well MW-3, to 15 04 feet btoc in well MW-2 <br /> Groundwater flow on that date was to the east-northeast at a gradient of 0 001, which is <br /> consistent with historical data <br /> The following list presents specific information on site conditions as requested by the <br /> California RWQCB <br /> The depth and extent of free product found, including an estimate of volume <br /> removed and volume remaining <br /> Not applicable, free product has not been observed at the site <br /> ■ Figures delineating lateral and vertical extent of soil contamination, <br /> groundwater degradation plume(s), and vapor plumes as appropriate <br /> Figures 3 through 7 illustrate lateral and vertical extent of soil and groundwater <br /> impact beneath the site <br /> ■ Tables summarizing analytical data such as compound concentrations found in <br /> soil and groundwater, and sample depth <br />' Appendix A contains soil and groundwater analytical data tables <br /> • An evaluation of the physical and chemical characteristics of the hazardous <br />' substance or its constituents, including its toxicity, persistence and potential for <br /> migration in water, soil, and air <br /> N lsacDP20041Py188018800401A 4ad doc Shaw Environmental,Inc <br />