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<br /> C A M B R A Mr Michael Inturna
<br /> • April 6, 2005
<br /> B-7 at concentrations up to 700 parts per nulhon (ppm) Total petroleum hydrocarbons as
<br /> gasoline (TPHg) were detected in soil from borings B-1 through B-3 at maximum concentrations of
<br /> 1,900 ppm Benzene was detected in soil from borings B-2, B-3, and B-6 at concentrations up to
<br /> 3 9 ppm Shallow soil samples from boring B-3 were also analyzed for total recoverable petroleum
<br /> hydrocarbons, none were detected Groundwater samples collected from borings B-2, B-3, and
<br /> B-6 contained 1,600 to 12,000 parts per billion (ppb) TPHd, 23,000 to 150,000 ppb TPHg, and
<br /> 970 ppb to 13,000 ppb benzene Geosystem's August 1995 Phase 1 and Phase H Site Assessment
<br /> describes this investigation
<br /> 1997 Soil Borings 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 the borings Soil samples from all the borings contained TPHd at concentrations ranging from
<br /> 1 3 to 260 ppm Soil from borings SB-1, SB-2, SB-4, and SB-5 contained up to 890 ppm TPHg
<br /> Benzene was detected in soil from boring SB-2 at maximum concentrations of 0 11 ppm Methyl
<br /> tertiary butyl ether (MTBE) was reported by EPA Method 8020 in samples trom borings SB-1,
<br /> SB-2, and SB-5 at concentrations up to 4 1 ppm No confirmation analysis was performed at that
<br /> time Soil samples from boring SB-2 were also analyzed for cadnvum, chromium, lead, nickel,
<br /> zinc, oil and grease, halogenated volatile organic compounds (HVOCs), and senu-volatile organic
<br /> . compounds (SVOCs) This boring contained 37 to 45 ppm chromium, 7 0 ppm lead, 36 to 39 ppm
<br /> ruckel, 43 to 52 ppm zinc, 184 ppm oil and grease, and 0 77 to 0 93 ppm phenol No other waste
<br /> oil constituents were detected in soil
<br /> Groundwater samples were also collected from all the borings TPHd was detected in groundwater
<br /> from all the borings at concentrations ranging from 430 to 25,000 ppb TPHg and benzene were
<br /> detected in borings SB-1, SB-2, SB-4, and S13-5 at concentrations ranging from 15,000 to
<br /> 38,000 ppb and 220 to 1,900 ppb, respectively MTBE was also reported in these borings by
<br /> EPA Method 8020 at concentrations ranging from 110 to 370 ppb The sample with the highest
<br /> reported MTBE was also analyzed by EPA Method 8260, and none was detected (<50 ppb)
<br /> Groundwater samples from boring SB-2 were also analyzed for cadmium, chromium, lead, nickel,
<br /> zinc, oil and grease, HVOCs, and SVOCs This boring contained 1,100 ppb chromium, 1,200 ppb
<br /> nickel, 1,600 ppb zinc, 51 ppb 1,2-dichloroethane (1,2-DCA), 390 ppb 2-methylnaphthaelene, and
<br /> 350 ppb naphthalene Enviros' July 10, 1997 Site Investigation Report sump-irizes this
<br /> investigation
<br /> 1998 Site Investigation During February 1998, Cambria advanced two cone penetration test
<br /> (CPT) borings (CPT-1 and CPT-2) and installed six groundwater monitoring wells (S-1 through
<br /> S-6) During this investigation soil samples were collected at depths of 40, 51, and 60 feet below
<br /> grade (tbg) in boring CPT-1 and at 40, 52, and 58 tbg in CPT-2 No TPHg, benzene, toluene,
<br /> ethylbenzene, xylenes, or fuel oxygenates were detected in soil from these borings Therefore,
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