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PUBLIC HISALTH SERVICES <br /> SAN JOAQUIN COUNTY Y. z <br /> ENVIRONMENTAL HEALTH DIVISION . <br /> Karen Furst, M.D., M.P.H., Health Officer �P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 <br /> DAVID ATWATER MAR 3 Z�Q� <br /> 'VAN DE POL ENTERPRISES <br /> P O BOX 1107 <br /> STOCKTON CA 95201 <br /> RE: CALIFORNIA FUELS STATION CODE: 1214 <br /> 2402 PACIFIC AVENUE <br /> STOCKTON CA 95204 <br /> San Joaquin County Public Health Services,Environmental Health Division (PHS/EHD) has reviewed <br /> Quarterly Report- October 1999 dated December 13, 1999 prepared by Advanced GeoEnvironmental, <br /> Inc. Maps and figures were not included in this report. <br /> PHS/EHD agrees with the report's recommendation to reduction of quarterly monitoring events to <br /> semi-annual basis until remediation at the site is initiated. Maps and figures of the site and well locations <br /> should be included in all future quarterly monitoring reports. <br /> &Air Sparge Well #2B (AW-2B) is the deepest screened well on site with the screen interval of AW-2B <br /> located from 60 to 70 feet below surface grade (bsg). Petroleum hydrocarbon analytes have been <br /> consistently detected in AW-2B groundwater samples. Analytical results of groundwater samples have <br /> been as high as 51,000 parts per billion (ppb) of total petroleum hydrocarbons (TPH-g) and 7,800 ppb of <br /> Benzene (ran/1999). PHS/EHD approved Work Plan Addendum -June 1998 dated June 8, 1998 <br /> prepared by AGE in an effort to define the vertical definition of the contamination in groundwater. <br /> On July 1, 1998, Boring#10 (B-10) was advanced to the depth of 95 feet bsg at a location approximately <br /> 5 feet south of AW-2B. However, when groundwater was not encountered at below 77 feet bsg in B-10, <br /> the proposed monitoring well was not installed. <br /> PHS/EHD recommends interim corrective action proceed as scheduled; however,vertical definition of <br /> the contamination in groundwater must be defined before the remediation plan can be considered final. <br /> Submit a work plan that will define the vertical extent of the contamination in groundwater no later <br /> than May 1, 2000. <br /> If you have any questions, please feel free to contact Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Jeffrey Wong, REHS Margaret Lagorio,REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: RWQCB, Central Valley Region-Marty Hartzell <br /> c: Advanced GeoEnvironmental,Inc.-Tim Cuellar <br /> A Division of San Joaquin County Health Care Services <br />