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UNDERGROUND STORAGE TANK REMOVAL <br />SOIL SAMPLING RESULTS <br />Sharpe Army Depot <br />Lathrop, California <br />August 28, 1995 <br />1.0 INTRODUCTION <br />Excavation and removal of one (1) 55 -gallon gasoline underground storage tank (UST) at <br />building 5-647 at the Sharpe Army Depot, Lathrop, California, was performed by Mr. Keith Tallia of <br />Oil Equipment Service (OES) on August 14, 1995. Condor Earth Technologies, Inc., (Condor) was <br />retained by OES to provide sampling and reporting services. This report was prepared following the <br />removal of the UST and includes a description of the field work, a discussion of the laboratory <br />analyses and conclusions/recommendations based on the results of the excavation sampling. <br />2.0 UNDERGROUND STORAGE TANK REMOVAL <br />On August 14, 1995, Keith Tallia of OES excavated and removed the UST (TK1) from the <br />site. The site location is shown in Figure 1, Appendix A. The former location of TK1 is shown in <br />Figure 2, Appendix A. Don Kresse of Condor was on site to make field observations and collect soil <br />and groundwater samples following removal of TK1. Letitia Briggs of the San Joaquin County Public <br />Health Services, Environmental Health Division (SJCPHS,EHD) was on site to observe the removal <br />of TK1 and to specify soil sampling locations and the laboratory analyses to be performed on each of <br />the samples. <br />The bottom of. TK1 was approximately 3.0 feet below the ground surface (bgs). The fill and <br />vent openings were in the middle of TK1 and extended out of the ground. Inspection of the exterior <br />of TK1 after removal indicated moderate corrosion. No holes or cracks were observed. No <br />underground piping associated with TKl was observed. <br />No petroleum odor was noted following the removal of TKI. The soil in the excavation <br />consisted of silty, brown, sand (backfill material) from the surface to approximately 5.0 feet bgs. <br />No petroleum staining was visible on the sidewalls or at the bottom of the excavation. Groundwater <br />%4 CONDOR <br />