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_ If <br /> CALIFORNIA GEOPHYSICAL GROUP, INC. ENVIRP,r,IME4MIAALUI <br /> O Box 578341, Modesto, CA 95357 ""' (209) 527-1247 <br /> January 6, 2003 03 FEB -3 Pkfj09) 52 7-48 10 <br /> Work Plan <br /> Darpetro 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 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 SM- i 1(,— 0h -j <br /> In March and April 1992, three more monitoring wells were installed Theywere 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, 19921 <br /> l <br /> ✓In July 1993 we installed two additional monitoring wells and dniled one boring This work was <br /> reported in our report dated August 24, 1993 Mk;7,Mw f 4 ,( <br /> ,/In September 1994, we installed three additional monitoring wells This work was reported in our <br /> report dated October 10, 1994 3 Mg- �m j) <br /> �` In April 1995 we drilled two CPT borings and they were reported in our report dated March 15, <br /> 1995 N6flk,,c - ?•?Waal1-F-tdr11,Jf 4b1 C1"r- Ftgd—tA-(A dk{ •tcjv { 4f1gr/95 repel d <br /> In February and March, 1996 five vapor extraction wells, one air sparging welland one boring <br /> were installed at this site This work was reported in our report dated March 19, 1996 <br /> /011 ) 4 VU-13 S 1 6014wy <br /> �. In April 1996 we drilled two additional CPT borings They were reported in our report dated .tune <br /> 10, 1996 -,vr 3 1�16jql'(Zll-r ,u61)3 - �'�'l , !k 4 <�c✓fG� j <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 />