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T <br /> 10 <br /> INTRODUCTION <br /> On July 20, 2005 one boring (B-4) was drilled on the US Station property The boring along with <br />' three monitoring wells were requested and approved by the Environmental Health Division (EDH) <br /> of San Joaquin County Only two wells were drilled (MW-14 and MW-16) Well MW-15 was not <br /> drilled because Beneto, Inc and Pep Boy could not reach an agreement <br />' On July 27 and 28, 2005, two wells were drilled MW-14 and MW-16 and groundwater samples <br /> were taken at 40 and 50 feet below the surface bgs <br />' SITE 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 areal 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 Apnl 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 spargmg 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 bonngs They were reported in our report dated June <br /> 10, 1996 <br />' In July 1999, we drilled an additional monitoring well MW-12 and a vapor boring to 80 feet, which <br /> was completed to a vapor extraction well, VW-7 They were reported in our report dated August 5, <br /> 1999 <br /> • 3 <br />