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CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> (40 C OBc�tober 43 1, Modesto, CA 95357 Tel- (209) 527-1247 <br /> Fax: (209) 527-4810 <br /> Work Plan RIECIMWEID <br /> Darpetro Station <br /> 749 E Charter Way OCT 16 ZOOZ <br /> Stockton, CA <br /> SITE No 1060 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> California Geophysical Group has been contracted by Darpetro, Inc to act as their Environmental <br /> Consultant for this site The following work will be performed to determine the source of the <br /> hydrocarbon contamination <br /> HISTORY <br /> On November 14, 1989 three tanks were removed at this site and three fiberglass tanks were <br /> installed The laboratory results taken at the time of removal tested positive for gasoline <br /> hydrocarbon contamination <br /> On December 19, 1989 an Electromagnetic Induction Survey was conducted on the site to aid the <br /> investigation of the aerial extent of the contaminated soil and in planning the position of the <br /> monitoring wells <br /> In January 1990 three monitoring wells were installed They were reported in our report dated <br /> February 9, 1990 <br /> In March and April 1992, three more monitoring wells were installed They were necessary <br /> because the groundwater had fallen below the depth of the original wells This work was reported <br /> in our report dated April 30, 1992 <br /> In July 1993 we installed two additional monitoring wells and drilled one boring This work was <br /> reported in our report dated August 24, 1993 <br /> In September 1994, we installed three additional monitoring wells This work was reported in our <br /> report dated October 10, 1994 <br /> I <br /> In April 1995 we drilled two CPT bonngs and they were reported in our report dated March 15, <br /> 1995 <br /> In February and March, 1996 five vapor extraction wells, one air sparging well and one boring <br /> were installed at this site This work was reported in our report dated March 19, 1996 <br /> In Apnl 1996 we drilled two additional CPT borings They were reported in our report dated June <br /> 10, 1996 <br /> In July 1999, we drilled an additional monitoring well MW-12 to 80 feet, This was reported in our <br /> report dated August 5, 1999 <br /> County <br />