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SS# 6348, Tracy <br /> QM Report, 1/31/92 <br /> FINDINGS <br /> Water-level measurements indicate that on December <br /> 11 , 1991 the depth from the surface to the groundwater <br /> averaged 9 .7 feet . The flow direction was to the N39E with a <br /> gradient of 0 . 001.0 foot per foot . These and earlier <br /> measurements are lasted in Table 1. <br /> As reported by ChromaLab of San Ramon, California, <br /> no TPHg or BTEX was detected in well MW-2 to the west of the <br /> station, indicating that an earlier release f rom the Shell <br /> station across Tracy Boulevard has not migrated to this site <br /> and that no onsite contamination is present at this location. <br /> No contamination was detected at MW-4 which is located at the <br /> northwest of the property in a downgradient direction from <br /> the underground tanks. At MW-3 , where TPHg and BTEX were <br /> identified before, these compounds are reported again. The <br /> benzene constituents are somewhat elevated from the previous <br /> reading. <br /> Laboratory results are listed in Table 2 . The <br /> laboratory report and chain-of -custody documentation are <br /> attached as Appendix A <br /> Mattelhauser Corporation recommends that scheduled <br /> quarterly monitoring continue an order to detect any changes <br /> which might occur in the condition of the subsurface. <br /> Please call me with any questions or comments <br /> about this report, at 10) 743-0335 . <br /> DGE GEp� <br /> Sincerely, <br /> MITTELHAUSER CORPORATION <br /> No 3633 <br /> ��q2 \� Mar o ie Bushnell <br /> `�lglE Of C ` Pro ct Manager <br /> A►i� <br /> attachments: <br /> Figure 1: Site Plan <br /> Table 1: Groundwater Levels <br /> Table 2 : Laboratory Results <br /> Appendix A: Laboratory Report <br /> Chain-of Custody Documentation <br /> Well-Monitoring Report <br /> copies: <br /> Mr. Keith Bullock, Unocal Corporation <br /> Ms. Beth Thayer, RWQCB <br />