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' Lodi Ready Mix Page 2 <br /> Site Closure Report <br /> Appendix D <br /> May 12,1995 <br />' Sampling and Analyses <br /> 1) Additional soil samples were collected from areas suspected to contain <br />' PHC. <br /> 2) Sampling and analyses protocol appeared to conform to standards <br />' prescribed by LUFT and the TRBSR at time of performance. <br /> 3) Appropriate soil sample analyses were used as per Table 2. <br /> 4) QA/QC results were submitted. <br />' 5) The site does not exhibit a high water table (not in contact with excavation) <br /> as evidenced by drilling to 42 feet below surface grade without encountering <br /> ' groundwater. Groundwater surface maps show that the depth to <br /> groundwater is approximately 53 feet below ground surface and that in "wet" <br /> years may be as high as 40 feet below ground surface <br /> ' 6) Soil samples were collected from the piping runs. <br /> 7) Depth and location of soil samples were submitted. <br /> CRWQCB Closure Checklist as per March 1, 1994 Tri-Regional Board Staff <br /> ' Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Tank Site, Appendix B, Central Valley Regional Water Quality <br /> Control Board Staff Recommendations for Closure Requests <br /> ' 1) The distance to nearest wells within 2,000 ft was not evaluated. <br /> ' 2) Site Maps are attached <br /> 3) Tabulated results of soil data presented in section S of this report <br /> 4) Hi ort and low water levels discussed in Section 3 of this re h g p <br /> ' 5) Vertical and lateral concentration contours of remaining PHC <br /> 6) A very conservative mass balance shows that approximately 3.6 gallons of <br /> diesel may remain after excavation. <br /> ' 7) Remedial action was performed by excavation. <br />