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k4 KLEINFEEDER <br /> 3 BACKGROUND <br /> Kleinfelder previously reviewed pertinent documents and Information related to the USTs <br /> on the site provided by General Mills Based on Kleinfelder's review of this Information, <br /> Kleinfelder understands the UST area discussed in this report is located south of the <br /> office and approximately 10 feet north of Building No 86 (See Plate 2) The two USTs <br /> were oriented north to south and situated side by side on an approximate 30 foot by 30- <br /> foot reinforced concrete pad At one time, reportedly, the two 10,000-gallon USTs <br /> contained diesel, kerosene and/or JP-4 het fuel <br /> An unauthorized release report was prepared by county employee Mr William R <br /> Snavely, dated January 14, 1988 This report indicated that a leak was discovered due <br /> to inventory discrepancies and that approximately 123 gallons of JP1 Fuel was <br /> estimated to have been released Comments In this release report stated the following <br /> "Manager discovered a discrepancy in inventory and called ITT Tank Service to check <br /> system, leak in filler pipe observed, Stockton Service Station advised that the tank be <br /> removed, tank is being pumped out and to be empty 1112188 " <br /> According to a previous EHD inspection report, a single 10,000-gallon fiberglass UST <br /> was removed from the site on January 29, 1988 Apparently, the tank was removed <br /> due to an unauthorized release The tank removed was described In the Inspection <br /> report as being the easternmost tank of two USTs located side by side to the north of a <br /> "new" building The bottom of the tank was at a depth of approximately 12 feet bgs and <br /> located on a large concrete pad Two bottom soil samples were collected at each end <br /> of the tank and at the ends of the concrete pad at approximate depths of 14 feet bgs <br /> Kleinfelder reviewed analytical data reports dated January 29, 1988 prepared by <br /> California Water Labs, Inc associated with these two samples The two soil samples <br /> were analyzed for TPH-G, TPH-D, total petroleum hydrocarbons as referenced to <br /> kerosene (TPH-K) and motor oil (TPH-MO), and benzene, toluene and xylenes (BTX) <br /> The northernmost soil sample was reported by the laboratory as "none detected" for the <br /> requested analyses at or above laboratory reporting limits TPH-K was the only analyte <br /> detected at 19 0 milligram/kilogram (mg/kg) from the soil sample collected from the <br /> southern end of the tank <br /> t The General Mills facility utilized this UST and the previously removed UST for fuels used <br /> to run the turbines in their food production process Kleinfelder understands that currently <br /> there is only one UST In place (western side of cement pad) and that the UST has been <br /> emptied of all contents, a condition required before drilling could commence <br /> Kleinfelder conducted a soils assessment In the vicinity of the existing UST based upon <br /> our proposal titled "Revised Proposal, Pre-Abandonment Underground Storage Tank <br /> Assessment, General Mills Facility, 2000 West Turner Road, Lodi, California," dated <br /> January 19, 1999 Two soil borings, B1 and B2 (Plate 2) were advanced west of the <br /> 28209 T09/ST06R160/CD Iv Page 3 of 12 <br /> 0 2006 Kleinfelder, Inc February 15, 2006 <br />