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QUAM ERY GROUNDWATER rMONMRING REPORT <br /> ' 6131 Pacific Avenue Stockton California <br /> w m�9� tQrsag a�el1 MW;3;=oQ--a-weedy <br /> or�vu ct th# bans,--from-February-to-Noveffiber-A991. -Thicknesses=�of-liquid <br /> I fr�cia it MWS re=11stsd in Table I Liquids remnved_fromthe three-wells arm <br /> temporarily stored-on site in Department of Transportation-approved 55-gallon:drum, 4o <br /> T�1W-�FFtcj�,w�!r--� 6rer-6disposed.of,-on-a-quarterljbass, by-Crosby &-Overton, Inc., of Oakland, <br /> V4��1 VI f Ifp y 1 <br /> 1 apor extracttm pil'ot�test-was performed at the site from November 27!19911;througYt <br /> i ebxcz y4, 11�99-2-�uring the test, hydrocarbon vapors were drawn from the subsurface, <br /> via vapor extraction wells VEW-1 and VEW-2, and the horizontal slotted piping The <br /> vapors were burned using a portable internal combustion engine The purpose of the <br /> pilot test was to determine efficiency parameters (i e , hydrocarbon vapor yield, <br /> combustion efficiency, etc ) that may be expected during possible subsequent vapor <br /> extraction at the site Results of the vapor extraction pilot test will be reported under <br /> separate cover <br /> Sufficient data does not exist at the present time to estimate "zero lines" for petroleum <br /> hydrocarbons in groundwater beneath the site Data obtained during subsurface <br /> investigations, UST removal, quarterly groundwater monitoring, and pilot testing <br /> performed at the site will be used to form recommendations for further investigation <br /> and/or remediation alternatives <br /> 4 0 GROUNDWATER MONITORING <br /> t, <br /> 41 Groundwater <br /> I On May 12, 1992, Emcon personnel collected measurements of depths to liquids in each <br /> of the three wells The measurements were collected according to the Emcon sampling <br /> procedures (SP) included in Appendix A A groundwater elevation hydrograph is included <br /> as Figure 3 Figure 4 is a contour map of the potentiometric surface of the shallow water- <br /> bearing zone on May 12, 1992 <br /> t During the past 4 months, since February 26, 1992, groundwater levels have risen 1 23, <br />` 1 21, and 1 30 feet in MW-1, MW-2, and MW-3, respectively Floating hydrocarbons were <br /> observed in MW-3 on May 12, 1992, at a thickness of 0 01 foot The groundwater <br /> t Plavnf,nn In MW-q wac rnrrPrtPH for hvrirnrarhnn 4I innrPcclnn arrnrrllnn to thin fermi Ila <br /> � <br /> noted in Table 1 �- --- ----- - � - ---- --�--�-� --- - ----- - � -- - M <br /> _�- � � , est <br /> esfir�a <br /> are-r- o"as o e nortneast <br /> E90-0208 OMR -2 <br />