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i <br /> CALIFORNIA GEOPHYSICAL GROUP, , LNG . : <br /> P. O . Box 578341 , Modesto, CA 95357 ; `' Tel : (209) 527- 1247 <br /> May 19, 2004 04 JUN - I PM 3: 59 Fax: (209) 527-4810 <br /> Public Health Services <br /> San Joaquin County <br /> P . O. Box 388 <br /> Stockton , CA 95201 <br /> RE : Work Plan <br /> Darpetro , Inc. USA Service Station <br /> 749 E. Charter Way <br /> Stockton , CA <br /> Site No. 1060 <br /> California Geophysical Group has been contracted by Darpetro, Inc. to act as their Environmental <br /> Consultant for this site . The following work plan will be performed to define the lateral and vertical <br /> extent of the impacted soil and groundwater 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 /> In April 1995 we drilled two CPT borings and this was reported in our report dated March 15, 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 April 1996 we drilled two additional CPT borings . They were reported in our report dated June <br /> 10, 1996 . <br />