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C Mr Michael Infurna
<br /> June 22, 2005
<br /> • Total petroleum hydrocarbons as diesel (TPHd) were detected in soil from borings B-I through
<br /> B-7 at concentrations up to 700 parts per million (ppm) Total petroleum hydrocarbons as
<br /> gasoline (TPHg) were detected in soil from bortngs 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 was detected Groundwater samples collected from borings 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 Geosystem's August 1995 Phase 1 and Phase 11 Srte
<br /> Assessment described this investigation
<br /> 1997 Sail Borings During April 1997, Enviros, Inc (Environ) of Sonoma, California drilled five
<br /> Geoprobe® soil borings (SBA through S13-5) Soil and groundwater samples were collected
<br /> from all the borings Soil samples from all the borings contained TPHd at concentrations ranging
<br /> from l 3 to 260 ppm Soil from borings SBA, SB-2, SB-4, and SB-5 contained up to 890 ppm
<br /> TPHg Benzene was detected in soil trom 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 /> SBA, SB-2, and SB-5 at concentrations up to 4 1 ppm No confirmation analysis for MTBE was
<br /> performed at that time Soil samples from boring SB-2 were also analyzed for cadmium,
<br /> chromium, lead, nickel, zinc, oil and grease, halogenated volatile organic compounds (HVOCs),
<br /> and semi-volatile organic compounds (SVOCs) Samples from this boring contained 37 to
<br /> 45 ppm chromium, 7 0 ppm lead, 36 to 39 ppm nickel, 43 to 52 ppm zinc, 184 ppm oil and
<br /> grease, and 0 77 to 0 93 ppm phenol No other waste oil constituents were detected in soil
<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 SBA, 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 reported MTBE was also analyzed by EPA Method 8260, and none was detected
<br /> (<50 ppb) Groundwater samples from boring SB-2 were also analyzed for cadmium, chromium,
<br /> lead, nickel, zinc, oil and grease, HVOCs, and SVOCs Samples from this boring contained
<br /> 1,100 ppb chromium, 1,200 ppb nickel, 1,600 ppb zinc, 51 ppb 1,2-dichloroethane (1,2-DCA),
<br /> 390 ppb 2-methylnaphthaelene, and 350 ppb naphthalene Enviros' July 10, 1997 Site
<br /> Investigation Report summarized this 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 (fbg) in boring CPT-1 and at 40, 52, and 58 fbg in CPT-2 No TPHg, benzene, toluene,
<br /> ethylbenzene, xylenes, or fuel oxygenates were detected in soil from these borings Therefore,
<br /> these borings delineated these constituents in soil above 40 fbg TPHd was detected at 16 ppm at
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