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I' Soil Remediation Summary Report <br /> Site.Code 2226,Economy Fence Company <br /> 2004 E.Mariposa Rd., Stockton,CA <br /> September 29, 1992 <br /> Page 2 <br /> Based upon the low levels of hydrocarbon constituents detected from native soil beneath_the tank <br /> and the condition of the tank at the time of removal, it`was initially estimated that less than 20 <br /> cubic yards-of hydrocarbon impacted soil remained in place. <br /> I <br /> FIELD ACTIVITIES <br /> Excavation. <br /> On August 24, 1992, suspected hydrocarbon impacted soils were excavated by Economy.Fence <br /> Company utilizing a backhoe tractor to perform the excavation. This work was performed by <br /> Economy Fence Company personnel in accordance with the Business and Profession Code, <br /> Division.3, Chapter 9, Article 3, Exemptions, on file with the PHS/EHD. <br /> The 12 by 14 feet excavation proceeded to a depth of approximately 10 feet below grade to <br /> ensure all suspected hydrocarbon impacted soils were removed from the former underground <br /> storage tank location. <br /> Excavated soils were field screened by RESNA personnel who were present in a consulting <br /> capacity, utilizing a photoionization detection (PID) meter, calibrated-to an isobutylene standard <br /> to detect volatile organic vapors. No hydrocarbon impacted soils were detected by PID readings <br /> f <br /> and field observations (i.e., odor, discoloration). <br /> Excavated soils were stockpiled on site, covered, and underlain by 6 mil plastic sheeting pending <br /> j results of laboratory analysis. <br /> Confirmation Sampling <br /> To verify source removal, five confirmation soil samples were collected by RESNA personnel <br /> under the regulatory guidance of Michael M. Collins of the PHSIEHD. One sample was <br /> collected from the excavation floor at approximately 10 feet below grade, and four were <br /> collected from the. sidewalls-at approximately 8 feet below grade (Figure 3). In addition, one <br /> 2 to 1 composite sample was collected from the excavated soil for characterization. Samples <br /> were placed on ice and transported under chain-of-custody protocol to State-certified RESNA <br /> Laboratories in Fremont, California, and analyzed for BTEX and TPHG utilizing EPA methods <br /> 8020 and modified .8015, respectively. No analytes were present in detectable concentrations, <br /> in any sample. Laboratory results are summarized on Table 2. Laboratory reports and chain-of- <br /> custody documentation are included in Attachment I. <br /> LFTTERSISRSR9292.DRF <br /> f4 <br /> 1 <br />