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<br /> gasoline (TPHg) were detected in soil from borings B-1 through B-3 at maximum concentrations
<br /> of 1,900 ppm Benzene was detected in soil from borings B-2, B-3, and B-6 at concentrations up
<br /> to 3 9 ppm Shallow soil samples from boring B-3 were also analyzed for total recoverable
<br /> petroleum hydrocarbons, none were detected Groundwater samples collected from bonngs B-2,
<br /> B-3, and B-6 contained 1,600 to 12,000 parts per billion (ppb) TPHd, 23,000 to 150,000 ppb
<br /> TPHg, and 970 ppb to 13,000 ppb benzene This investigation is described in Geosystem's
<br /> August 1995 Phase I and Phase II Site Assessment
<br /> 1997 Soil Borangs During April 1997,Enviros, Inc (Enviros) of Sonoma, California drilled five
<br /> Geoprobe soil borings (SB-1 through SB-5) Soil and groundwater samples were collected from
<br /> all of the borings Soil samples from all the borings contained TPHd at concentrations ranging
<br /> from 13 to 260 ppm Soil from borings SB-1, SB-2, SB-4, and SB-5 contained up to 890 ppm
<br /> TPHg Benzene was detected in soil from boring SB-2 at maximum concentrations of 0 11 ppm
<br /> Methyl tertiary butyl ether (MTBE) was reported by EPA Method 8020 in samples from borings
<br /> SB-1, S13-2, and SB-5 at concentrations up to 4 1 ppm No confirmation analysis was performed
<br /> at that time Soil samples from boring SB-2 were also analyzed for cadmium, chromium, lead,
<br /> nickel, zinc, oil and grease, halogenated volatile organic compounds (HVOCs), and semi-volatile
<br /> organic compounds (SVOCs) This boring contained 37 to 45 ppm chromium, 7 0 ppm lead, 36
<br /> to 39 ppm nickel, 43 to 52 ppm zinc, 184 ppm oil and grease, and 0 77 to 0 93 ppm phenol No
<br /> other waste oil constituents were detected in soil ,,BEd=tt t a7tted,l r .41 a�i 01C
<br /> Groundwater samples were also collected from all the borings TPHd was detected in
<br /> groundwater from all the borings at concentrations ranging from 430 to 25,000 ppb TPHg and
<br /> benzene were detected in borings SB-1, SB-2, SB-4, and SB-5 at concentrations ranging from
<br /> 15,000 to 38,000 ppb and 220 to 1,900 ppb, respectively MTBE was also reported in these
<br /> borings by EPA Method 8020 at concentrations ranging from 110 to 370 ppb The sample with
<br /> the highest MTBE reported was also analyzed by EPA Method 8260 and none was detected
<br /> (<50 ppb) Groundwater samples from boring SB-2 were also analyzed for cadinium, chromium,
<br /> lead, nickel, zinc, oil and grease, HVOCs, and SVOCs This boring contained 1,100 ppb
<br /> chromium, 1,200 ppb nickel, 1,600 ppb zinc, 51 ppb 1,2-dichloroethane (1,2-DCA), 390 ppb
<br /> 2-methylnaphthaelene, and 350 ppb naphthalene This investigation is summarized in Enviros'
<br /> July 10, 1997 Site Investigation Report
<br /> 1998 Site Investigation• During February 1998, Cambna drilled two cone penetration test (CPT)
<br /> borings (CPT-1 and CPT-2) and installed six groundwater monitoring wells (S-1 through S-6)
<br /> During this investigation, soil samples were collected at depths of 40, 51, and 60 feet below
<br /> grade (fbg) in boring CPT-1 and at 40, 52, and 58 fbg in CPT-2 No TPHg, benzene, toluene,
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