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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer FILE <br /> GipOrt <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 520 JUL Q 7 10-I? <br /> 209/468-3420 <br /> RICHARD FISH WL SIMMONS <br /> DEL MONTE FOODS C/O SIDNEY RUDY ESQ <br /> PO BOX 9004 PARMACEAST <br /> WALNUT CREEK CA 94598-0904 333 MARKET <br /> SAN FRANCISCO CA 94105 <br /> RE: QUARTERLY MONITORING REPORT REVIEW SITE CODE:2498 <br /> RESPONSE TO REQUEST TO DISCONTINUE <br /> OXYGENATE ANALYSES AND QUARTERLY SAMPLING <br /> DEL MONTE/DISCO SITE <br /> 110 FILBERT STREET <br /> STOCKTON CA <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> has reviewed the files for the above referenced site including recent and historic quarterly <br /> ground water sampling data sets submitted to this office. <br /> Reports have been submitted to this office regarding the site referenced above without <br /> signatures from an appropriately registered professional. Additionally, these reports often <br /> lack conclusions and recommendations by a registered professional (see Quarterly <br /> Monitoring Results Report dated February 1999 submitted by CH2M HILL). <br /> Groundwater elevation measurements were not recorded for Piezometers NP-1-70', 80', <br /> or 90' during the February 11, 1999 monitoring event and measurements from MW-DIS- <br /> 7D and 8D "were not used to interpret the groundwater gradient because those wells <br /> are screened in different stratigraphic intervals from the shallow wells" according to the <br /> unsigned CH2M HILL report_ All reports with hydrogeologic conclusions and <br /> recommendations must be signed and stamped by an appropriately registered professional <br /> (examples; RG, CEG, CHG, PE). During all future groundwater monitoring and sampling <br /> events potentiometric heads must be recorded, evaluated, and reported in all wells <br /> containing groundwater. At a minimum, the February 1999 report submitted by CH2M <br /> HILL must be amended with recommendations and conclusions including a signature <br /> from a registered professional. The report amendment must be submitted to <br /> PHS/EHD by July 30, 1999 5:00pm. <br /> Fuel additivesiblending agents/oxygenates have been confirmed in the subsurface <br /> environment at this site as tertiary butanol (TBA, from Nested Piezometers and Soil <br /> Vapor Extraction Wells on different occasions and different depths). In correspondence <br /> dated June 16, 1999 you requested the elimination of oxygenate testing (EPA Method <br /> 8260). EPA Method 8020 cannot identify or quantify TBA. In order to reduce cost, you <br /> Division of San Joaquin County Health Care Services J <br />