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Ms. Vicki McCartney Project No. 8800401A.0201 <br /> October 26, 2004 <br /> fx Page 4 <br /> F <br /> Figures 5, 6, and 7 illustrate the extent of the MtBE plu�ie beneath the subject site based e <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,Wfeet bgs appears to be the <br /> main migratory pathway downgradient of the site. . Appendix A contains current and <br /> q(' <br /> historical��groundwater chemical analytical data. ° �At <br /> On 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 /> Groundwaterflow 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 fi-ee product found, including an estimate of volume <br /> removed and volume remaining. <br /> 1 <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 /> IJ <br /> ■ An evaluation.of the physical and chemical characteristics of the hazardous <br /> 1 <br /> substance or its constituents, including its toxicity, persistence and potential for <br /> migration in water, soil, and air. <br /> -1 <br /> F __ <br /> N:isacDPi2004 Pnlssois800401a.aad.doc Shaw Environmental,Inc. <br />