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i <br /> PUBLIC HEALTH SERVIdS <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer, " <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 �iFbR <br /> 209/468-3420 <br /> MICHELLE NOKES MAR ® 2 1998 <br /> ANTIOCH TOYOTA <br /> 1810 SOMERSVILLE ROAD <br /> ANTIOCH CA 94509 <br /> RE: DISCOVERY CHEVROLET SITE CODE: 2595 <br /> 1615 W 11'" STREET <br /> TRACY CA 95376 <br /> San Joaquin County Public Health Services/Environmental Health Division (PHS/EHD) has <br /> reviewed "Selection of Soil Samples for Analysis" dated 02/27/98 prepared by Horizon <br /> Environmental Inc. Based on PHS/EHD field notes taken on 02/19/98 during the drilling of the <br /> GeoProbe (GP) soil borings, and the heed for analytical data in order to perform mass balance <br /> calculations before closure can be considered, PHS/EHD recommends the soil samples collected <br /> from GP4, GPS, GP6, GP7, and GP8 at 10 feet and 20 feet collected on 02/19/98 be analyzed for <br /> petroleum hydrocarbons as gasoline(TPH-g), aromatic hydrocarbons (BTEX), and fuel <br /> oxygenates as proposed in the "Work Plan for Additional Subsurface Investigation" dated <br /> 01/27/98 and "Addendum to Work Plan" dated 02/10/98. PHS/EHD concurs with Horizon that it is <br /> unnecessary to analyze the soil samples taken from GP1 GP2, GP3, and GP9 at 10 feet and 20 <br /> feet. <br /> r <br /> If you have any questions, please feel free to contact Jeff Wong at(209)468-0335. <br /> Donna.Heran, RENS, Director <br /> Environmental Health Division <br /> AJeffrey �Wong , EHS, Trainee Margaret gorio, REHS " <br /> LOP/Site Mitigation Unit IV Supervisor <br /> JW:lb <br /> c: Horizon Environmental Inc. - Ken Mateik . <br /> c: RWQCB, Central Valley Region - Pat Anderson <br /> i <br /> i <br /> A Division of San Joaquin County Health Care Services ` <br />