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CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> O Box 578341, Modesto, CA 95357 Tel (209) 527-1247 <br /> Fax (209) 527-4810 <br /> WORK PLAN <br /> FOR <br /> DARPETRO SERVICE STATION <br /> 749 E. CHARTER WAY <br /> STOCKTON, CALIFORNIA <br /> SEPTEMBER 14, 1995 <br /> SITE HISTORY <br /> On November 14, 1989 three underground tanks were removed from <br /> the site in accordance with the Tri--Regional regulations. <br /> Testing of the soil samples taken around the old tanks indicated <br /> the site had been contaminated with gasoline. <br /> The excavation site was backfilled with the original soil plus <br /> soil from a new excavation. The site was then remodeled and <br /> placed back in service. <br /> A work plan for assessing the contamination of the site was sent <br /> to the San Joaquin Health Department on December 29 , 1989. The <br /> plan was accepted and a special well permit was issued on January <br /> 19, 1990. <br /> Drilling and sampling according to the work plan began on January <br /> 22, and finished on January 26 , 1990 . A Site Assessment Report <br /> was submitted to San Joaquin County Health on February 9 , 1990 . <br /> On October 1 , 1990 we began quarterly sampling, by that time the <br /> water table had dropped below the bottom of the wells and has <br /> remained so till this time. <br /> In April 1992 , we drilled three additional wells at the site into <br /> the water table. The results of this work were reported in our <br /> Site Assessment Report on April 30, 1992 . <br /> In August 1993 , we drilled two additional wells in order to define <br /> the groundwater plume and to investigate the possibility of <br /> contaminated water entering our site from an up gradient source. <br /> In September, 1994 , three additional wells were drilled to <br /> further define the limits of the contamination. <br /> Upon the request of the San Joaquin County Environmental Health <br /> Division (EHD) , two hydropunch borings were placed on the <br /> property at 721 E. Charter Way to help define the high <br /> concentration of TPH in the groundwater in this area. This work <br /> was done in June, 1995. The results indicated an area of <br /> groundwater with higher concentrations of TPH than the area closer <br /> • to the source area at 749 E. Charter Way, Stockton, CA. <br /> Page 1 <br />