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ENVIRONMENTAL HEALTH EPARTMENT <br /> ° SAN JOAQUIN COUNTY <br /> �o <br /> :.2 Unit Supervisors <br /> v. Donna K.Heran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> s Mike Huggins,R.E.H.S.,R.D.T. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> Douglas W.Wilson,R.E.H.S. <br /> eQ�! o Raga Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S, <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S, <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> NICHOLAS BOKIDES MAY 0 7 2002 <br /> MEL BOKIDES PETROLEUM, INC. <br /> 521 WEST PINE STREET <br /> LODI CA 95240 <br /> RE: Mel Bokides Petroleum SITE CODE: 691 <br /> 8203 Highway 26 <br /> Stockton CA 95204 <br /> San Joaquin County Environmental Health Division (EHD) has reviewed "Preliminary <br /> Investigation and Evaluation Report" (the report) dated March 7, 2002, that was <br /> submitted by Advanced GeoEnvironmental, Inc. regarding the above referenced site and <br /> has the following comments. <br /> The report details investigative site work that took place on October 15 through 17, <br /> 2001, when six soil borings were advanced at the site, of which three were turned into <br /> monitoring wells. As described in the report, subsequent sampling of the wells took <br /> place on November 2, 2001. <br /> Results of the investigation indicate that soil at the site has been impacted by petroleum <br /> hydrocarbons and oxygenated fuel additives. The highest concentrations of soil <br /> contamination were encountered in the area of borings B1, B5, and B6. Analytical <br /> results from boring B5, included 15,000 mg/kg total petroleum hydrocarbons as gasoline, <br /> (TPHg), 9,100 mg/kg total petroleum hydrocarbons as diesel (TPHd), and 1,700 mg/kg <br /> xylene. Methyl tertiary butyl ether (MTBE) concentrations were highest in borings B1 <br /> and B5 at 30 feet bsg and B1 and B6 at 40 feet bsg- B5 at 30 feet had the highest <br /> concentration of MTBE at 18,000 µg/kg. <br /> The results of groundwater sampling showed that TPH and benzene, toluene, <br /> ethylbenzene and total xylene (BTEX) were not detected in any of the monitoring well <br /> samples. MTBE was detected in the sample from MW-1 by EPA method 8020 at 5.9 <br /> µg/i and by EPA method 8260 at 4.7 µg/l. <br /> The report recommends continued sampling and analysis of groundwater from monitor <br /> wells MW-1, MW-2, and MW-3 on a quarterly schedule. The report also recommends a <br /> vapor extraction feasibility study to remediate the vadose zone at the site. EHD agrees <br /> with these recommendations. <br />