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PHONE 285 2460 <br /> CABLE ADDRESS TIMOIL <br /> TACOMA EN L1yiF�iJ,'rljciRj (FAX) 206 283 8036 <br /> PORTLAND I3F l_ �[ �r1 <br /> STOCKTON t1 12 1 Ta <br /> RENO <br /> RICHMOND 923 onE TIME <br /> �� t� w• <br /> LOS ANGELES � r <br /> 8 4 j <br /> T 5 5 TS 2737 WEST COMMODORE WAY SEATTLE WA 98199-1233 <br /> T <br /> PRODUCTS PO BOX 24447 SEATTLE WA 98124-0447 <br /> TIME TESTED M <br /> E <br /> January 25, 1995 <br /> Mr Harlan Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P O Box 2009 <br /> Stockton, California 95201 <br /> RE Submittal of Groundwater Monitoring Report- Fourth Quarter 1994 <br /> Jackpot Food Mart, 1434 W Yosemite Ave , Manteca, CA (Prop No 04-167) <br /> Dear Mr Knoll, <br /> Please find enclosed Science & Engineering Analysis Corporation's (SECOR) "Quarterly Monitoring <br /> Report, October- December 1994" dated January 17, 1995 This report presents the analytical results <br /> of groundwater samples collected from monitoring wells at the subject site during the fourth quarter of <br /> 1994 and summarizes field observations <br /> On October 25, 1994, samples were collected from each of the monitoring wells at the subject site Prior <br /> to purging, the depth to groundwater in each well was measured by a representative of SECOR to assist <br /> in evaluating changes in elevation, flow direction, and gradient As noted in the attached report, <br /> groundwater with an easterly flow was encountered at 15 87 to 17 17 feet below ground surface After <br />• purging, each well was sampled with a new, disposable bailer to prevent cross-contamination <br /> Analyses did not indicate the presence of gasoline or its constituents in samples collected from any of <br /> the groundwater monitoring wells sampled Table 4 in SECOR's report summarizes all groundwater data <br /> collected to date, and Appendix B contains analytical reports from the most recent sampling event The <br /> locations of the wells are presented on Figure 2 <br /> Since the previous sampling event, depth to groundwater has increased across the site by approximately <br /> 0 25 feet, and flow changed from northeast to east These variations are consistent with those observed <br /> In previous sampling events, however, not enough data has been collected to determine their cause <br /> While trace toluene concentrations appeared in W-6 during the December 1993 groundwater sampling <br /> event, no hydrocarbons were indicated during the July 1994 and October 1994 sampling events <br /> SECOR's "Final Remediation Plan", recommending vapor extraction for remediation of the site's <br /> hydrocarbon-impacted soils, was approved by the PHS/EHD in October 1994 Since that time, SECOR <br /> has been evaluating vapor abatement equipment and obtaining appropriate permits It is estimated that <br /> system will be installed during early 1995 If you have any questions regarding this project, please feel <br /> free to phone me at (206) 286-4495 If I am unavailable, Kevin Murphy may be able to assist you <br /> Sincerely, ' <br /> Anastasia E Duarte <br /> Environmental Toxicologist <br />• cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> jan9614167119 doe <br />