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d ix <br /> Lodi Ready M Page 2 <br /> Site Closure Report <br /> Project No. 93.1 <br /> May 12, 1995 <br /> T <br />' a bulk concrete mixing and loading plant. This facility once operated two <br /> underground storage tanks of which one 1,000 gallon capacity tank held diesel <br />' fuel and the other 1,000 gallon capacity tank held gasoline motor fuel for <br /> business operation. <br />' On December 19, 1989, Thorpe Oil Company uncovered and removed two <br /> carbon steel underground storage tanks (1,000 gallon capacity unleaded tank <br />' I.D. 1359-01 and a 1,000 gallon capacity diesel tank I.D. 1359-02) from the 851 <br /> East Lodi Avenue location. The tanks were purged and triple rinsed of all <br /> remaining petroleum product which was containerized, manifested (Manifest <br /> #87849390-EPA site #CAC000158517), and properly disposed of at Refineries <br />' Service in Patterson, California. The inerted tanks were transported to and <br /> received on January 11, 1990 by Schnitzer Steel Products of Rancho Cordova, <br /> ' California. <br /> Detectable concentrations'of petroleum hydrocarbons were found in the soil <br /> ' beneath the south ends of both former UST's and the pump island (samples <br /> GS-1, 2, 3, 4, & 5). This information was transmitted to the PHS/EHD in the <br /> April 4, 1990 Jim Thorpe Oil Company Re-Excavation/Re-Sample Work Plan. <br /> MOn August 1, 1990, a re-excavation and sampling effort was performed by Jim <br /> Thorpe Oil, Inc. The original tank removal excavation was enlarged to <br /> ' remove contaminated soil. Confirmation soil samples were collected and <br /> two samples were shown to contain detectable petroleum hydrocarbons. This <br /> information was transmitted to the PHS/EHD by William J. Hunter and <br /> ' Associates. <br /> On or about October 10, 1990, a second re-excavation was performed in the <br /> ' south area of the re-excavation of the former UST and pump island removal <br /> excavation. Slight levels of petroleum hydrocarbons were detected in several <br /> of the confirmation soil samples tested. This information was compiled into <br /> ' the November 1990 Site Assessment Report transmitted to the PHS/EHD by <br /> William J. Hunter and Associates. <br /> iThe excavated soil was stockpiled on site and the excavation was backfilled <br /> with clean washout sourced from the operation of the cement plant. The <br /> ' stockpiled soil was divided into 10 piles each containing approximately 50 <br /> cubic yards of material. <br /> ' On October 22, 1991, Geological Technics Inc. (GTI) collected soil samples from <br /> the stockpiled soil and tested them in order to characterize their chemical <br /> content. Only two piles of soil were shown to contain detectable levels of <br /> ' petroleum hydrocarbons: <br /> 1 <br />