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ENVIRO?�RENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> mf; ?{ Ronna K.Heran,R.E.H.S. 304 East Weber AVenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> A]Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> _ r•` Douglas W.Wilson,R.E.H.S. <br /> c4�ikoRr'�PProgram Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (2.09) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> FEB 0 6 2006 <br /> JAY AND MARY MCILRATH <br /> P O BOX 326 <br /> STOCKTON CA 95201 <br /> RE: Jay's Mini Mart SITE CODE 1289 <br /> 3302 West Lane RO: 676 <br /> Stockton, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan <br /> for Additional Subsurface Investigation at Jay's Mini Mart, dated January 12, 2006, and <br /> submitted by ATC Associates Inc. (ATC) on your behalf ATC proposes to advance <br /> seven soil borings to 60 feet below ground surface (bgs), and one soil boring to 50 feet <br /> bgs. Five of the borings will be advanced in the area surrounding the location of the <br /> former dispenser island at the southern portion of this site "to eliminate soil data gaps in <br /> this area"; one boring will be advanced to a total depth of 50 feet bgs near monitoring <br /> well MW-2 to eliminate soil data gaps above 50 feet bgs; and two borings will be <br /> advanced northwest and southeast of the current dispenser islands to 60 feet bgs to further <br /> investigate hydrocarbon contamination previously identified in soil samples collected <br /> from soil borings B1, S133, and SB4. <br /> EHD agrees that soil borings in the south portion of this site near the former fuel <br /> dispensers FD5 and FD6 would provide additional site characterization; however, <br /> gasoline constituents were not detected in soil samples collected during the removal of <br /> fuel dispensers FD5 and FD6 and gasoline constituents were not detected in soil samples <br /> collected during the installation of monitoring well MW-1 located southeast of the former <br /> dispenser islands. Therefore, unless a technical justification for each boring is provided, <br /> EHD will only approve the proposed boring southeast of SB3 and the boring between the <br /> former dispenser islands. If significant field indications of contamination are <br /> encountered in these borings, the adjacent proposed borings may be advanced if <br /> warranted in the opinion of the person in professional charge of the investigation. <br /> EHD believes additional site investigation is needed in the areas down gradient and <br /> adjacent to the USTs, B1, S133, and SB4 where known hydrocarbon contamination is <br /> documented. Therefore, EHD approves the borings proposed to collect soil data above <br /> 50 feet bgs near MW-2 and the two soil borings proposed to be advanced northwest and <br /> southeast of the current dispenser islands. EHD is concerned about the detection of 1,2- <br /> dichloroethane (1,2-DCA) at 31 micrograms per liter (ltg/L) found in a grab groundwater <br /> sample from soil boring SB3. Groundwater data collected during the six groundwater <br /> monitoring events from January 2004 to September 2005 indicate the onsite groundwater <br />