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AM <br /> 404 WEST FREMONT STREET <br /> WKA No. 1628.09 <br /> �--? August 31, 2001 <br /> Page 4 <br /> Shallow groundwater beneath the site appears generally unconfined and has been observed to <br /> J fluctuate widely over the last 15 years. On October 29, 1986, when monitoring well MWl was <br /> k.=a installed, groundwater was measured at 16.3 feet below ground surface. However, WKA <br /> -_� personnel measured the depth to water approximately six years later(12122192) at 27.3 feet bgs. <br /> The groundwater level beneath the site subsequently rose as high as 12.5 feet bgs but has <br /> recently returned to approximately 15 feet below grade. <br /> F= Site History <br /> Crystal Cream. and Butter Company(Crystal Creamery)has owned and operated a dairy <br /> distribution facility at the site since 1965. Prior to this date the site was owned by Clover Leaf <br /> Dairy,which also operated a dairy processing plant on site. <br /> Mr. Steve Jerkins of Crystal Creamery was interviewed by telephone on April 29, 1991 regarding <br /> historical information on the underground storage tank previously removed from the site. He <br /> 8* g P Y <br /> indicated no specific knowledge of existing records of tank maintenance, leaks, spills or <br /> f_ accidents. He also indicated that he had no personal knowledge of fill or use records. <br /> Project History <br /> The following information was obtained during a review of files located at the San Joaquin <br /> E_ County Environmental Health Department (SJCEHD). <br /> One 10,000-gallon unleaded gasoline storage tank was removed from the site on September 3, <br /> 1986. Analytical results of soil samples collected from beneath the tank by Mr. Michael Ramos, <br /> immediately following the tank removal, revealed Total Petroleum Hydrocarbon as gasoline <br /> (TPHg) concentrations ranging from X20 mg/kg to 3,600 mg/kg. <br /> On October 29, 1986 Applied GeoSystems (AGS) drilled and sampled two soil borings. Boring <br /> B1 was advanced to 21.5 feet below grade; ground water was encountered at 16.3 feet below <br /> grade during drilling. Boring B2, which was subsequently converted to monitoring well MW1, <br /> was advanced to 3 8.5 feet below grade; ground water was reportedly encountered at 18 feet <br /> J <br /> -.� <br /> INK <br /> f� <br /> Rr�drd�nii „A a):'.-,flE`AVF-S W!(" <br />