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Site Background Information: Enterprise Investments (former J.B. Murphy Trucking) <br /> Page 3 of 3 <br /> fuel oxygenated compounds were detected at or above laboratory reporting limits. <br /> On 31 January 2002, six soil borings were advanced at the site. Pilot borings MW 1 through MW5 <br /> were completed as ground water monitoring wells using 2-inch diameter polyvinylchloride (PVC) <br /> casing with 0.020-inch slotted screen installed from approximately 5 feet to 20 feet bsg in borings <br /> MW 1,MW3,MW4,and MW5 and from approximately 30 feet to 35 feet bsg in boring MW2,with <br /> blank casing extended to the surface in each well. Pilot boring EW 1 was completed as a ground <br /> water extraction well using 6-inch diameter PVC casing with 0.020-inch slotted screen installed from <br /> approximately 5 feet to 20 feet bsg. TPH-g was detected in the soil samples collected from MW 1, <br /> MW3, MW4, MW5, and EW1 at 10 feet bsg at concentrations as high as 160 mg/kg. TPH-d was <br /> detected in the same samples,with the exception of EW 1,at concentrations as high as 3,800 mg/kg. <br /> No other analytes were detected at or above laboratory reporting limits in the soil samples analyzed. <br /> During the second quarter 2003,AGE recommended site closure and abandonment of the wells on- <br /> site. This request was denied by the San Joaquin Environmental Health Department (EHD), and <br /> quarterly monitoring events resumed in the third quarter 2004. <br /> From initial monitoring in February 2002 to the first quarter 2007, eighteen monitoring events have <br /> taken place at the site.Contamination has been non-detect in groundwater since 2002 in wells MW I, <br /> MW-3, and MW-4, since 2004 in wells MW-2 and MW-5, and since May 2006 in well EW-1. <br /> Advanced GeoEnvirunmental.Inc. <br />