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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> R <br /> -� 304 East Weber Avenue, Third Floor <br /> a: < Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> y P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> c4�1FORr'� 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 /> APR 0 3 2002 <br /> JOHN & MAXINE FERRAIOLO <br /> PO BOX 757 <br /> LODI CA 95241 <br /> RE: HARRY' S AUTO MART SITE CODE: 1306 <br /> 2662 N WILSON WY <br /> STOCKTON CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has <br /> received First Quarter 2002 Groundwater Monitoring and <br /> Sampling Report dated March 24, 2002 prepared by Ground Zero <br /> Analysis, Inc . (Ground Zero) . Analytical results of the <br /> latest groundwater samples collected from monitoring well 1 <br /> (MW-1) were 180, 000 micrograms per liter (µg/L) of Total <br /> Petroleum Hydrocarbons as gasoline (TPH-g) , 13 , 000 µg/L of <br /> Benzene, 18, 000 µg/L of Toluene, 4, 400 µg/L of Ethylbenzene, <br /> 21, 000 µg/L of xylenes, and 900 µg/L of 1, 2-dicholoroetheane <br /> (1, 2-DCA) . Analytical results of groundwater samples from <br /> MW-2 and MW-3 were 150 µg/L of 1, 2-DCA and 110 µg/L of 1, 2- <br /> DCA. California Department of Health Services Primary <br /> Maximum Contaminant Level (MCL) for Drinking Water is 1 µg/L <br /> for benzene and 0 . 5 µg/L for 1, 2-DCA. <br /> The extent of the groundwater contamination at this site has <br /> not been defined. Submit a work plan that will define the <br /> extent of the contamination in groundwater by May 26, 2002 . <br /> In a telephone conversation on March 27, 2002 , EHD agreed <br /> with Ground Zero that due to relatively deep soil <br /> contamination, high concentrations of benzene and 1, 2-DCA, <br /> and the presence of multiple alternating stiff sand and clay <br /> layers (Monitoring Well Installation and Vertical <br /> Investigation Report dated July 2, 2001 prepared by Ground <br /> Zero) , technologies such as air sparging, vapor extraction, <br /> and groundwater pump and treat remediation may be <br /> inappropriate for this site. EHD agrees with Ground Zero <br /> that a test to evaluate the feasibility of ozone sparging as <br /> a remediation alternative should be conducted for this site. <br /> Submit a feasibility work plan for ozone sparging to EHD by <br /> June 15, 2002 . <br />