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PUBLIC TiEALTH SERVICES <br /> pau�N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer :'• <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 4!02 <br /> 2091468-3420 ~ + <br /> 4 L <br /> MANUEL & MARY E SANCHEZ JUL 17 07 <br /> 1633 W WALNUT ST <br /> STOCKTON CA 95203 <br /> RE: Former Underground Tanks SITE CODE. 1844 <br /> 1876 Country Club Blvd. <br /> Stockton, CA., 95203 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS- <br /> EHD), has reviewed the "First Quarter-1997, Groundwater Monitoring Report" (QMR) as <br /> submitted by your consultant, WM. Hunter & Associates on .lune 30, 1997, and has the <br /> following comments. <br /> Although a Fourth Quarter, 1996, Groundwater Monitoring Report has not been <br /> received at this office, tables in the First QMR-1997 indicate that groundwater <br /> petroleum concentrations have dropped since the December 18, 1996 sampling event. <br /> With the depth to groundwater (DTW) at its highest level ever recorded (May 1, 1997) <br /> and the Benzene concentration in MWA at the lowest concentration ever detected, <br /> PHS-EHD has concluded that the additional water in the monitoring well above the <br /> screened interval is acting to dilute the sample and not allowing an accurate <br /> representation of the groundwater condition. <br /> Recent soil sampling activities have indicated that the highest levels of soil <br /> contamination exists between the two former dispenser islands at 16 feet below ground <br /> surface. PHS-EHD has concluded that as long as the groundwater and top of the <br /> saturated zone continue to be above the monitoring well screened interval, accurate <br /> groundwater petroleum concentrations cannot be collected. PHS-EHD cannot support <br /> your consultant's conclusion that the groundwater plume is stable and does not require <br /> any further action. <br /> Previous discussions concerning the relatively shallow residual soil contamination still in <br /> place have suggested that over-excavation of the soil may be an option for this site. <br /> Pursuant to Article 11 Corrective Action Requirements (California Code of Regulations, <br /> Title 23, Division 3, Chapter 16), two alternatives to achieve the numerical objectives <br /> designated in our water quality control plans must be evaluated and the most cost <br /> effective alternative implemented. If over-excavation is the most cost effective <br /> alternative, then a workplan should be submitted to PHS-EHD. <br /> A Division of San Joaquin County Health Care Services <br />