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1 <br /> O s h source the remaining liquid in the UST was removed and stored in <br /> • Once identified a the g q <br />' the Baker Tanks on-site Testing of the liquid indicated the material was fuel oil A UST <br /> removal permit was subnutted and approval received on December 12, 2003 Prior to <br /> removal, the UST was triple rinsed UST removal activities were commenced on <br /> December 15, 2003 and the UST was removed from the site on December 17, 2003 <br /> Samples for chemical analysis were collected from the east and west ends of the UST <br />' excavation, as well as from beneath a product line that had been attached to the tank No <br /> TPH or other volatile organic compounds (VOCs) were detected in the soil samples <br />' analyzed from the tank ends The sample collected from beneath the product line <br /> contained TPH in the diesel range (2,300 ppm), as well as low concentrations of several <br />' other VOCs <br /> Approximately 100-tans of oil-contaminated soil was removed from the site and disposed <br />' of as non-RCRA hazardous waste at Waste Management's Kettleman City facility in <br /> California Oil from the top of the water in the Baker Tanks was skimmed off and <br />' disposed of off-site The remaining water was either transported and disposed of off-site <br /> or discharged under permit to the City of Stockton, Department of Municipal Utilities, <br /> sanitary sewer On December 19, 2003, SJCEHD issued a "Notice of Responsibility" to <br />' UniFirst Corporation indicating it had been assigned to the Local Oversight Program <br /> (LOP) with the County In November 2004, UniFirst received a letter from SJCEHD <br />' indicating that a groundwater investigation for the former UST area would be required <br /> based on shallow groundwater conditions A copy of these letters is included as <br />' Appendix A of this report In accordance with the requirement for a groundwater <br /> investigation, URS submitted a workplan to SJCEHD, which it approved on March 24, <br /> 2005 <br /> 3.0 OBJECTIVES <br /> The objective of the site investigation work is to assess soil and groundwater quality in <br /> the immediate vicinity of the former UST to evaluate if a release from the UST has <br />' impacted soil and groundwater The installation of groundwater monitoring wells also <br /> provides data for use in establishing site-specific groundwater gradient and flow direction <br /> information for use in evaluating potential impact from offsite upgradient sources <br />' 4.0 MONITORING WELL INSTALLATION <br /> • The following section details the installation of the groundwater monitoring wells at the <br /> site The work was conducted from April 18 through April 20, 2005 Drilling activities <br />' 3 V\Goodwin ProctorTinalReport doc <br />