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' L HEALTH <br /> VICE <br /> tli-plill f `r-8141;E BID REQUEST FOR <br /> ADDITIONAL SOIL AND Gj=AATER ASSESSMENT <br /> � q� PROPERTI ERCIAL SITE <br /> L39 WEST CLAY STREET <br /> STOCKTON, CALIFORNIA 95206 <br /> (APN 147-071-10) <br /> Consulting Engineers, and Geologists experienced in the field of <br /> underground storage tank corrective action work are being invited to <br /> submit bids to conduct an additional soil and groundwater site <br /> assessment. <br /> The objective is to carry out a soil and water investigation as they <br /> are defined in Section 2722 (a) of the California Underground <br /> Storage Tank Regulations (Title 23 , Division 3 , Chapter 16 <br /> California Code of Regulations) at West Clay Properties. <br /> Based on West Clay Properties current understanding of the site <br /> conditions, and our preliminary understanding of the San Joaquin <br /> County Environmental Health Division ' s SJCEHD ' (S) desires and <br /> requirements, we prepared this request. <br /> BACKGROUND <br /> On May 31, 1990, one 1, 000-gallon underground storage tank was <br /> removed from the site by Triangle, Inc. Tank removal soil samples <br /> were obtained by Cal Water Labs of Modesto, California. The results <br /> of analyses on the samples revealed hydrocarbons to be present in <br /> the soil beneath the former tank location. <br /> On October 7, 1993 , the product line running from the former tank <br /> location to the dispenser (located dust off the southeast corner of <br /> the shop building) was removed. Soil samples were obtained during <br /> the removal by EMCON Associates of Sacramento, California. The <br /> results of the analytical testing on the samples revealed only trace <br /> concentrations of some fuel constituents. <br /> DSS Engineering Contractors subsequently excavated approximately 550 <br /> cubic yards of hydrocarbon-affected soil from the UST excavation. <br /> However, the limit of the affected soil was not able to be <br /> ascertained. Soil was excavated to a depth of approximately 38 feet <br /> in some areas. <br /> Based on the presence of hydrocarbons naar the groundwater surface <br /> and the need for better definition of the volume of <br /> hydrocarbon-affected soil, a soil and groundwater assessment bid was <br /> requested and Kleinfelder, Inc. was the successful bidder. <br /> During the field portion of the Kleinfelder soil and groundwater <br /> assessment, boring B-1 was advanced to a depth of 45. 5 feet below <br /> grade surface (bgs) . Free groundwater was encountered at 45 . 5 <br /> instead of the published depth of 60 feet bgs. Because of the <br /> photoionization detector (PID) readings present in the samples at <br /> that depth, the boring was abandoned immediately to avoid <br /> contaminant migration into groundwater. The boring was abandoned by <br /> Pumping it from the bottom up with neat cement. The other three <br /> borings (B-2 , B-3 , and B-4) were advanced to depths of 59 . 5 feet, 60 <br />