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L Page 2 <br /> Geological Teclutics Inc. g <br /> City of Escalon(Escalon) <br /> Project No.: 1114:2 <br /> September 29,2003 <br /> L <br /> Boring logs compiled during the investigation of the site reveal the upper 50 feet of <br /> L sediment is comprised of alternating layers of sands, silts and clays. Boring logs from work <br /> performed by Kleinfelder in 1996 and 1997 are included in Appendix A. Lithology is <br /> displayed in two cross sections included as Figure 9 and Figure 10. <br /> L <br /> A review of the USGS Topographic Map, Escalon Quadrangle, reveals that the elevation of <br /> this site,is approximately.115 feet above.MSL. Based on the information from a nearby site <br /> located at 1305 Escalon Avenue, groundwater depth averages.approximately 57 feet below <br /> ground surface (bgs), and groundwater is estimated to flow approximately N67W at an <br /> average slope of 0.0017 ft/ft. <br /> 1.3 Site Background <br /> L <br /> Extensive site investigation has taken place at the site since July of 1988. Subsurface <br /> Lfmonitoring conducted on July 14, 1988 by Reda Darlene Reuss of the San Joaquin County <br /> Public Health Services, indicated the presence of petroleum hydrocarbons discharged from <br /> a pipe leak. <br /> On September 27, 1988, Jogi Khanna, M.D., M.P.H., District Health Officer, San Joaquin <br /> Local Health District (SJLHD), reviewed the Supplemental Site Assessment submitted on <br /> LSeptember 8, 1988 by ETS Environmental. Dr. Khanna's review concluded the following: <br /> • SJLHD does not concur with the conclusions and recommendations of the ETS <br /> r Environmental report. <br /> L • Further investigation may be required in the future to identify the nature and extent <br /> of soil contamination noted in the Preliminary Site Assessment Report of July 11, <br /> 1988, and prove that groundwater contamination has not occurred at this site. <br /> L • . An Unauthorized Release Report will be filed for this facility and it will be added to <br /> the list of sites with evidence of soil contamination. <br /> L <br /> On December 30, 1988, Jogi Khanna, M.D., M.P.H., SJLHD, approved, with revisions, a <br /> work plan for subsurface environmental investigation. <br /> L On June 23 1989 Jogi Khanna M.D. M.P.H. SJLHD reviewed the <br /> g Preliminary <br /> Assessment Report and found the report to be inadequate. Dr. Khanna requested a work <br /> L plan to address continued field investigative work. <br /> Charles E. Hunt;San Joaquin County PHS-EH reported an unauthorized release of gasoline <br /> during a tank test conducted on December 13, 1989. Mr. Hunt recommended further site <br /> [ assessment. <br /> L <br /> L <br />