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REQUEST FOR SITE CLOSURE <br /> Genera( Mils Facility <br /> 2000 West Turner Road <br /> Lodi, Ca orrua <br /> Delta Project No 40-92-708 <br /> Page 3 <br /> construct the water table contour mac shown m Figure 5 The airect ion of ground water flow has been <br /> consistently toward the southwest at an approximate hydraulic Crradtent of 0003 to 0.005 <br /> Ground water samples were collected from each monitoring well during tour quarterly sampling events <br /> and submitted to a certified lanoratory for analyses of BTEX and TPH as diesel No 6 BTEX or TPH <br /> as diesel No 6 were not detected in any of the ground water samples collected. The ;round water <br /> sample results are presented in Table 4 The laboratory data sheets are presented in Delta's reports dated <br /> June 9 and October 16, 1992, and January 21 and May 28, 1993 <br /> 2.6 Commun:cstions with San oa uin County <br /> In a letter dated February 17, 1993, San Joaquin County Public Health Services, Environmental Health <br /> Division (County) presented a review of the site conditions and, based on their review, requested <br /> additional site assessment work Apparently, the County performed a Leaching Potential Analysis <br />• described in the Leaking Underground Fuel Tank (LUFT') Manual and, based on rhat analysis, determined <br /> that number 6 heating oil detected ui the tank basin floor in Octocer 1991 had the potential to migTate <br /> to ground water <br /> In a letter dated March 18, 1993, Delta presented a Leaching Potential Analysis, based on information <br /> collected during the hydrogeologic invesugation conducted at the site Presented in Taole 5 is Delta's <br /> analysis Our analysis indicates that the maximum allowable TPH as diesel No 6 concentrations should <br /> be 1,000 ppm. <br /> On April 15, 1993, representatives of the County, Delta, and General Mills met to discuss appropriate <br /> actions at the site. It was determined that the difference between the County's and Delta's Leaching <br /> Potential Analyses was the assumed depth to ground water- the County assumed a minimum depth to <br /> ground water from the soil samples contauung fuel od 46 was less than 25 feet and Delta assumed that <br /> it was greater than 25 feet (see Table 5)- Using the County's assumption, the maximum allowable <br /> concentration of TPH as diesel No 6 should be 100 ppm, using Delta's assumption, the maximum <br />. allowable concentration should be 1,000 ppm. <br /> RPT076 TA <br />