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L EnvirOmega Consultants <br /> 16732 Palmero Drive <br /> t San Diego, California 92128 <br /> L (619) 676-0046 <br /> e <br /> December 11, 1996 <br /> The Hill Companies, Inc. <br /> 226 Airport Parkway, Suite 206 <br /> L San Jose, California 95110 <br /> I Attention: Ms. Ginny Spencer <br /> Subject: Report on Environmental Services <br /> Sacramento Insulation Contractors Property <br /> ` 1722 East Flora Street <br /> Stockton, California 95205 <br /> EOC Project No. EOC-96-028 <br /> L Dear Ms. Spencer, <br /> At your request and representing Sacramento Insulation Contractors (SIC), EnvirOmega <br /> Consultants (EOC) has prepared this report on environmental services performed for the SIC site <br /> located at 1722 East Flora Street in Stockton, California. The services completed include the <br /> advancement of two soil borings; the collection and analysis of soil samples, and the collection <br /> and analysis of one groundwater sample. The location of the site is presented on the Vicinity <br /> Map, Figure 1. <br /> 1 SUMMARY OF BACKGROUND INFORMATION <br /> Blaine Tech Services Inc. of San Jose, California, removed a 1,000 gallon underground storage <br /> tank (UST) from the subject site on November 1, 1988. The UST, which reportedly stored <br /> �- gasoline, was inspected by Ms. Kasey Foley from the San Joaquin Public Health Services, <br /> Environmental Health Division (PHS), following the removal of the tank. During Ms. Foley's <br /> t inspection, holes were observed in the tank. Additionally, Ms. Foley directed the collection of <br /> one soil sample from beneath the UST at a depth of 13 feet below the ground surface (bgs). <br /> This soil sample contained a total petroleum hydrocarbon (TPH)concentration of 57 milligrams <br /> per kilogram (mg/kg) and was quantified as gasoline. This soil sample also exhibited benzene, <br /> L toluene, ethylbenzene, xylenes (BTEX) and organic lead concentrations above their respective <br /> detection limits. The soil removed from the excavation during the tank removal was reportedly <br /> spread on the ground surface in a grassy area located to the south of the warehouse building. <br /> The approximate former location of the UST and the estimated area where the excavated soil <br /> was spread on the site are presented on the Site Plan, Figure 2. <br /> A few months after the removal of the UST, and when not informed by the PHS that they were <br /> i required to perform additional environmental services on the site, SIC backfilled the tank <br /> excavation to the ground surface with clean soil obtained from another area of the site. <br /> Additionally, the former location of the UST was paved at ground surface with asphalt. <br /> L <br /> S <br /> L <br /> I <br /> L <br />