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ENVIRONMENTAL HEALTAEPARTMENT <br />SAN JOAQUIN COUNTY <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202 <br />Telephone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />Donna K. Heran, R.E.H.S. <br />Director <br />Al Olsen, R.E.H.S. <br />Program Manager <br />Laurie A. Cotulla, R.E.H.S. <br />Program Manager <br />Unit Supervisors <br />Carl Borgman, R.E.H.S. <br />Mike Huggins, R.E.H.S., R.D.I. <br />Douglas W. Wilson, R.E.H.S. <br />Margaret Lagorio, R.E.H.S. <br />Robert McClellon, R.E.H.S. <br />Mark Barcellos, R.E.H.S. <br />SHELDON HECKMAN <br />CONNELL MOTOR TRUCK CO <br />PO BOX 8467 <br />STOCKTON CA 95202 <br />RE: River City Petroleum Card lock <br />2211 N. Wilson Way <br />Stockton, CA., 95205 <br />FEB 1 4 2002 <br />Site Code: 1304 <br />RO#: 0000447 <br />San Joaquin County, Environmental Health Department (EHD) has reviewed the "Fourth <br />Quarter 2001 Monitoring Well Sample Analysis Report" dated January 10, 2002 as <br />submitted by Foothill Engineering on January 16, 2002, and has the following <br />comments. <br />This quarterly monitoring report (QMR) completes the sixth consecutive sampling event <br />since the last series of monitoring well were installed in September and October 2000. <br />With the exception of the September 13, 2001 sampling event, groundwater flow <br />direction has stabilized and a trend appears to have been established. Petroleum <br />concentrations in the groundwater do not appear to be increasing at this time. <br />The monitoring wells that were installed deep into the saturated zone show consistent <br />low to non-detect petroleum concentrations and EHD agrees with the conclusion <br />included in this report that further investigation below the depth of 100 feet below ground <br />surface (` bgs) is not needed at this time. <br />A request to remove EPA Method 8260B from quarterly analysis was included in this <br />report. EHD is concerned with this site's history of pumping gasoline during the 1950's <br />and 1960's where the use of Lead, EDB, and the Lead scavenger, di-chloroethane (1,2- <br />DCA) were used. An analysis for these constituents is required before EHD can <br />approve your request to remove this method from the sampling requirements. You are <br />hereby directed to quarterly analyze all groundwater samples from each well <br />associated with this UST investigation for Lead, EDB, and 1,2-DCA. Your request <br />to discontinue EPA Method 8260B is not approved at this time. Once consecutive <br />quarterly groundwater sampling events verify that these constituents are not present in <br />the groundwater, you may request the discontinuance then. <br />MW-8S (shallow) is located to the west of the former UST pit and dispenser location and <br />is mostly up gradient of the core of the known UST petroleum groundwater plume. <br />Consistently elevated Total Petroleum Hydrocarbons as Gasoline (TPHg) and Benzene <br />concentrations have been detected in this first-interface well and EHD considers the <br />plume to be undefined in this quadrant.