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ISite Background Information
<br /> . Former FISCO WAREHOUSE (Howard Lenz Property)
<br />' 1648 Shaw Road, Stockton, California
<br /> as gasoline (TPH-g) was detected in samples from B-1, B-3, and B-5 at concentrations as high as
<br /> 14,000 mg/kg. Benzene was detected in only one sample (B-1-40), at a concentration of
<br /> 0.042 mg/kg. Toluene, ethylbenzene, and xylenes were detected in samples from B-1,B-3, and B-5
<br />' at concentrations as high as 1,600 mg/kg (xylenes in B-5-25). TPH-d was detected in samples from
<br /> B-1, B-3, and B-5 at concentrations as high as 12,000 mg/kg (13-3-10 and B-3-15). None of the
<br /> samples analyzed from borings B-2 or B--4 contained detectable concentrations of TPH-g, TPH-d,
<br /> I volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes (BTEX), or methyl
<br /> tertiary-butyl ether (MTBE).
<br />' From 22 to 24 February 2000, four soil borings (MW-1 through MW-3 and B-6) were advanced at
<br /> the site. TPH-g was detected in 9 of the 16 soil samples analyzed at concentrations as high as
<br /> 6,700 mg/kg; TPH-d was detected in 7 of the 16 soil samples analyzed at concentrations as high as
<br /> 5,800 mg/kg.Benzene was detected in 4 of the 16 samples at concentrations as high as 0.027 mg/kg.
<br /> Toluene, ethylbenzene, and xylenes were detected in 11 of the 16 samples at concentrations as high
<br /> as 370 mg/kg. MTBE was not detected in any samples analyzed.Petroleum hydrocarbons were not
<br /> detected in 5 of the 16 soil samples analyzed.
<br /> In February 2001, four pilot soil borings were advanced at the site. Pilot borings MW-4 through
<br /> MW-7 were completed as groundwater monitoring wells using two-inch diameter PVC casings with
<br /> 0.020-inch slotted screens installed from approximately 60 feet to 40 feet bsg and with blank casing
<br /> extending to the surface. A total of 16 soil samples were analyzed for TPH-g, TPH-d, BTEX, 1,2-
<br /> dibromoethane(EDB), 1,2-dichloroethane (1,2-DCA), and the suite of five fuel additives.None of
<br /> the analytes were detected at or above laboratory reporting limits in the soil sample analysis.
<br /> IOn 10 and 11 January 2002, three soil boring (CPT-1, CPT-2, and CPT-3) were advanced on-site
<br /> utilizing CPT technology to model the geological and hydrogeologic framework and to assess
<br /> I potential dissolved petroleum migration pathways beneath the site. Soil borings CPT-1,CPT-2,and
<br /> CPT-3 were advanced vertically to total depths of 96 feet bsg, 134 feet bsg, and 125 feet bsg,
<br /> respectively, utilizing a 25-ton truck-mounted CPT drill rig equipped with 1.50-inch diameter
<br /> hollow-stem rods.
<br /> A total of five grab ground water samples were collected from CPT-1, CPT-2, and CPT-3
<br /> and submitted for laboratory analysis for TPH-g, TPH-d, BTEX, EDB, 1,2-DCA, and the
<br /> suite of five fuel additives. Ground water samples were collected from: CPT-1 between
<br /> 92 feet and 96 feet bsg (CPT-1-92-96); CPT-2 between 76 feet and 80 feet bsg
<br /> (CPT-2-76-80) and between 92 feet and 96 feet bsg (CPT-2-92-96); and CPT-3 between
<br /> 74 feet and 78 feet bsg(CPT-3-74-78) and between 92 feet and 96 feet bsg (CPT-3-92-96).
<br /> Groundwater samples CPT-2-76-80 and CPT-3-74-78 were collected from HUl.TPH-d was
<br /> • detected in sample CPT-3-74-78 at a concentration of 64 micrograms per liter(µg/1). Total
<br /> Advanced GeoEnvironmental,Inc
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