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rILE <br /> f PUBLIC H ALTH SERVI&S <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 <br /> 2091468-3420 <br /> PAUL SUPPLE NOV 0 7 2000 <br /> ARCO PRODUCTS COMPANY <br /> P O BOX 6549 <br /> MORkGA CA 95470 <br /> RE: ARCO Station #6080 SITE CODE: 0712 <br /> 85 Louise Ave. <br /> Lathrop CA 95330 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has <br /> reviewed the "Soil and Groundwater Investigation Report" dated October 13, 2000 that was <br /> submitted by Delta Environmental Consultants, Inc. (Delta) on behalf of the above referenced <br /> site and has the following comments. <br /> I <br /> The report documents site work that took place on June 12, 2000 when three monitoring a <br /> wells were installed to first groundwater, and the subsequent development and sampling of ? <br /> the wells that took place on June 21 and June 23, 2000. Soil samples for analysis were <br /> collected during the drilling of the borings for the monitoring wells. <br /> Soil and groundwater samples were analyzed for total petroleum hydrocarbons as gas and <br /> benzene, toluene, ethylbenzene and xylene (BTEX) by EPA Method 8020, and for fuel <br /> oxygenates, 1,2-dichloroethane and ethylene dibromide by EPA Method 8260A. Results of <br /> the analyses indicate that soil and groundwater beneath the site have been impacted with <br /> petroleum hydrocarbons and fuel oxygenates. <br /> There are several errors and inconsistencies between the data listed in the laboratory <br /> analytical reports and the data listed on Table 1, Soil and Groundwater Analytical Summary <br /> and Groundwater Elevation Data. For example, the tabulated reporting limit for the BTEX <br /> results from the soil sample collected from boring MW-1 at 26 feet below surface grade was <br /> 100 gglkg, while the laboratory report listed it at 5.0 µg/kg. Please have your consultant <br /> review the data and make all necessary corrections to Table 1. <br /> Please submit a work plan to continue the investigation of the vertical and lateral extent of <br /> the documented contamination at this site. Submit the work plan to PHS/EHD by December <br /> 8, 2000. If you have any questions, please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Lori Duncan, Senior REHS Dot Lofstr m <br /> LOP/Site Mitigation Unit IV Registered Geologist, Unit IV r <br /> cc: Marty Hartzell, CVRWQCB <br /> Jay Johnson, Delta <br /> A Division of San Joaquin County Health Care Services <br />