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<br /> S E C 0 R
<br /> 3017 K;lgore Road Suite 100
<br /> Rancho Cordova CA 95670
<br /> 916-861-0400 TEL x
<br /> 916-861-0430 w+x
<br /> TPHg at 2,100 ppm (TD-2), toluene at 3 5 ppm (TD-3), ethylbenzene at 18 ppm (TD-3), and total
<br /> xylenes at 110 ppm (TD-3) TPHd, oil range total petroleum hydrocarbons (TPH-O), and
<br /> benzene were not detected above laboratory detection limits Laboratory analysis of soil samples
<br /> from borings THP 1 and THP-2 detected maximum concentrations of TPHd at 1 ppm (THP1S-
<br /> 10) and benzene at 0 03 ppm (THP@S-15) TPHg, TPH O, toluene, ethylbenzene, and total -
<br /> xylenes were not detected above laboratory detection limits Laboratory analysis of groundwater "
<br /> samples from borings THP-1 and THP-2 detected maximum concentrations of TPHg at 6,900 ppb
<br /> (THP2W-21), TPHd at 840 ppb (THP2W-21), benzene at 1,900 ppb (THP2W-21), and total
<br /> xylenes at 77 ppb(THP2W-21) TPH-O, benzene toluene, ethylbenzene, and Halogenated
<br /> Volatile Organic Compounds (HVOC's) were not detected above laboratory detection limits
<br /> (EMCON, 1994)
<br /> On December 10 through 22, 1998, Gettler-Ryan Incorporated (GR) supervised the removal of
<br /> two 10,000 gallon and one 8,000 gallon single-walled UST, dispensers, and associated product
<br /> dispenser piping Laboratory analysis of sod samples collected from the UST excavation
<br /> detected maximum concentrations of TPHg at 31 ppm (3W), benzene at 027 ppm (3W), and
<br /> Methyl-tert Butyl Ether(MtBE) at 80 ppm (3E) Laboratory analysts of soil samples collected from
<br /> the beneath the dispensers and product piping detected maximum concentrations of TPHg at
<br /> 1,600 ppm (D1) and MtBE at 1 8 ppm (D3) Additionally, approximately 15,000 gallons of water
<br /> was removed from the UST excavation during the installation of the new USTs Laboratory
<br /> analysis of a grab groundwater sample detected maximum concentrations of TPHg, benzene,
<br /> and MtBE at 17,000 pg/L, 1,500 pg/L, and 120,000 pg/L, respectively Groundwater monitoring
<br /> well MWA was destroyed to allow the enlargement of the existing UST excavation to allow for the
<br /> installation of the new USTs (GR, 1999)
<br /> • On October 7 and 8, 1999, Cambria Environmental Technology, Incorporated (Cambria)
<br /> conducted Cone Penetration Testing (CPT) by advancing six borings (CB-1 through CB-6)for soil
<br /> and groundwater sampling and two borings (CB-2E and CB-4E) for electric sod logging Sot]
<br /> samples were collected every five feet to approximately 20 feet bgs Water samples were
<br /> collected using a hydropunch at depths of 16 and 29 feet bgs in borings CB-1, CB-2, and CB-4
<br /> through CB-6 Water samples were collected at depths of 16 and 29 feet bgs in boring CB-3
<br /> Laboratory analysis of sod samples collected from the sod borings detected maximum
<br /> concentrations of gasoline range organics (GRO) at 27 milligrams per kilogram (mg/kg) (CB-3-
<br /> 13 5), MtBE at 27 mg/kg (CB-3-13 5), and Tert amyl methyl ether (TAME) at 0 058 mg/kg (CB-3-
<br /> 135) BTEX was not detected above laboratory detection limits Laboratory analysis of
<br /> groundwater samples collected from the soil borings detected maximum concentrations of
<br /> gasoline range organics (GRO) at 87,000 pg/L (CB-4-16HP), benzene at 1,300 lag/L (CB-4- w
<br /> 16HP), MtBE at 38,000pg/L (CB-1-16HP), and TAME at 160 pg/L (CB-1-16HP) (Cambria, 1999)
<br /> On June 12 and 13, 2000, Cambria replaced destroyed Well MW-1 and damaged Well MW-2 with
<br /> Groundwater Monitoring Wells MWA R and MW-2R to depths of 31 5 and 30 feet bgs,
<br /> respectively In addition, Cambria drilled and installed two 2-inch diameter wells (MW-9 and MW-
<br /> 10) to a total depth of 31 5 feet bgs Laboratory analysis of sod samples collected from the soil r
<br /> borings detected maximum concentrations of TPHg at 0 82 mg/kg (MWB-12') and MtBE at 2 6
<br /> mg/kg (MW8-30) BTEX was not detected above laboratory detection limits Laboratory analysis
<br /> of groundwater samples collected from all wells detected maximum CON gr�trations of TPHg at
<br /> 3,400 NgIL {VW-1 benzene at 84 pg/L (VW-1), MtBE at 250,000 pg/lh, 7and Tert-butyl Alcohol
<br /> (TBA) at 17,00 g/L (MW-2R) (Cambria, 2000) V 30,1`6 u
<br /> In November 2001, SECOR conducted a five-day dual-phase extraction (DPE) test to reduce they
<br /> amount of petroleum hydrocarbons to soil and groundwater beneath the site, and to determine
<br /> • the feasibility of DPE as an applicable technology for remediation at the site DPE tests were
<br /> performed on well MW-1 R for 3 hours, MW-2R for 3 hours, VW-1 for 2 hours, and simultaneously
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