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Site Assessment Report
<br /> 1022 Frontage Road
<br /> C A M B R I A Ripon, California
<br /> December 16, 2005
<br /> samples collected from the pilot boring for well MW-9 at 15,20,25,and 30 ft bgs were submitted to
<br /> the laboratory for analysis No soil samples collected from boring EW-1 were submitted to the
<br /> laboratory for analysis TPHg was detected in soil samples collected from boring MW-9 at 20,25 and
<br /> 30 ft bgs at concentrations of 260,0 36 and 0 24 mglkg,respectively No benzene was detected in any
<br /> of the soil samples analyzed MTBE was detected in samples collected from boring MW-9 at 15,25,
<br /> and 30 ft bgs at concentrations of 0 016,0 54,and 0 27 mg/kg,respectively TPHd was only detected
<br /> in the 20 ft sample of boring MW-9at a concentration of 800 mg/kg
<br /> June 2002 In June 2002,AGE conducted a 48-hour groundwater extraction pilot test to assess the
<br /> characteristics of the aquifer and its response to groundwater extraction The test was performed on
<br /> extraction well EW-1 screened from 16 to 36 ft bgs A maximum drawdown of 9 76 feet was
<br /> measured in extraction well EW-1 while pumping at a constant rate of 6 gallons per minute(gpm) A
<br /> maximum drawdown of 0 40 feet was observed in observation MW-1, located 20 feet from extraction
<br /> well EW-1 The transmissivity and hydraulic conductivity of the shallow aquifer were calculated at
<br /> 1,000 ft2lday and 0 175 cm/sec,respectively Additional details are presented in AGE's November 6,
<br /> 2002 Well Installation and Groundwater Aquifer Pumping Test Report
<br /> • May 2004 In May 2004,TEC Accutite removed one 1,000-gallon,steel waste oil UST Soil samples
<br /> TPI and TP2 were collected by Cambria during the waste oil UST removal activities No TPHg,
<br /> benzene,fuel oxygenates,volatile organic compounds(VOCs),or poly-chlorinated biphenyls(PCBs)
<br /> were detected All leaking underground fuel tank (LUFT) metal concentrations appeared to be
<br /> background concentrations TPHd was detected at concentrations of 0 mg/kg(TPl)and 160 mg/kg
<br /> (TP2) No estimate of the amount of soil excavated was provided
<br /> May 2005 In May 2005, TEC Accutite removed or closed in place the piping related to the former
<br /> waste oil UST Soil samples WOI through W04 were collected by TEC Accutite dunng the waste
<br /> oil piping removal activities No benzene, fuel oxygenates, or PCBs were detected TPHd was
<br /> detected in soil samples WO I, W03, and W04 at concentrations of 3, 234, and 17,600 mg/kg,
<br /> respectively No VOCs were detected,except for 1,3,5-tnmethylbenzene(1,3,5-TMB)(2 76 mg(kg),
<br /> 1,2,4-TMB (1 03 mg/kg),and sec-�iutyl benzene(0 761 mg/kg) No semi-volatile organic compounds
<br /> (SVOCs)were detected,except fglr naphthalene(2 74 mg/kg)and 2-methylnaphthalene(6 52 mg/kg)
<br /> in soil sample WO4 All LUFT etal concentrations appear to represent background concentrations,
<br /> except for 392 mg/kg zinc,detect in soil sample W03 at 3 ft bgs No estimate of the amount of soil
<br /> excavated was provided l Oq �, X !4/
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