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N - - <br /> CALIFORNIA GEOPHYSICAL GROUP , INC . <br /> P . O . Box 578341 , Modesto, CA 95357 Tel : (209) 527- 1247 <br /> Fax: (209) 527-4810 <br /> May 27, 2005 <br /> Environmental Health Department <br /> San Joaquin County <br /> 304 East Weber Avenue Third Floor <br /> Stockton , CA 95202-2708 <br /> Attn: Mr. Nuel Henderson <br /> Re : Amended Work Plan to Work Plan dated October 16 , 2004 <br /> Beneto Tank Lines , 749 East Charter Way, Stockton , CA Site No. 1060 <br /> California Geophysical Group has been contracted by Beneto Tank Lines to act as their <br /> Environmental Consultant for this site. The following work will be performed to determine the <br /> source of the 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 /> In April 1995 we drilled two CPT borings 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 April 1996 we drilled two additional CPT borings. They were reported in our report dated June <br /> 10, 1996. <br />