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Ms. Kasey Foley Fuel System Upgrade Report September 22, 2003 Page 5 Soil Sample Analytical Results— Dispensers, Fuel Lines, and USTs Soil samples were collected beneath the dispensers, fuel delivery piping between the dispensers and the USTs, and beneath and at the ends of the USTs. The soil samples collected beneath the dispenser and fuel delivery piping contained concentrations of MTBE ranging from 0.0076 milligrams per kilogram (mg/kg, L4-4.0') to 4.5 mg/kg (D1-4.0'). TBA concentrations were detected in several samples ranging from 0.0053 mg/kg (L3-3.5') to 12 mg/kg (D1-4.0'). TAME was detected in sample D1-4.0' at 0.024 mg/kg. TPHg, BTEX, and other fuel oxygenates were not reported in any soil samples above laboratory method detection limits. Nine soil samples were collected from the ends and beneath of the USTs. Two soil samples (T1-10' and T2-10'), located at the northwest end of the tank pit, contained TPHg concentrations of 1.4 and 2.2 mg/kg, respectively. Minor concentrations of benzene were detected in T6-10' and T8-10' at concentrations of 0.0051 mg/kg and 0.0070 mg/kg, respectively. MTBE was detected in all samples at concentrations ranging from 0.88 mg/kg (T5-14.0') to 36 mg/kg (T1-10'). TBA was detected in all samples at concentrations ranging from 0.073 mg/kg (T5-14.0') to 52 mg/kg from soil sample T3-10' collected from the northwestern edge of the 15,000 gallon UST. Concentrations of BTEX, DIPS and ETBE were not detected in any tank pit soil samples above laboratory method detection limits. Stockpiled Soil Sample Analytical Results and Disposal MTBE and TBA were reported in the three composite soil samples at maximum concentrations of 6.8 mg/kg (SP3-[ABCD]) and 29 mg/kg (SP2-[ABCD]), respectively. TAME was detected in composite soil sample SP3-[ARCD] at 0.012 mg/kg. Total lead was reported in all soil and pea gravel composite samples at a maximum concentration of 8.07 mg/kg (SP3-[ABCD]). Since TPHg, BTEX, and fuel oxygenates were not detected in any of the pea gravel composite samples, SECOR requested permission from the SJCEHD to reuse the excavated pea gravel as backfill material for the current excavation. The SJCEHD authorized the reuse of the pea gravel, only if it was screened for the removal of any debris before its placement into the excavation. Glacier subsequently screened the pea gravel stockpile, and replaced the pea gravel in the tank pit excavation. Following waste profiling and the receipt of landfill approval, approximately 736 tons of soil removed from the expanded UST excavation and dispenser/piping upgrade activities was hauled to Forward between June 14, 16, and July 3, 2003 under non-hazardous waste manifest documentation. Copies of the Non-Hazardous Waste Manifests are included in Attachment C. Groundwater Analytical Results, Transport, and Disposal Between May 3 and June 16, 2003, five water samples were collected and analyzed from the site. Initial concentrations in water samples collected from the tank pit observation wells before UST removal activities reported maximum concentrations of MTBE, TBA, and TAME at 510,000 micrograms per liter (ug/L), 79,000 ug/L, and 1,500 ug/L, respectively (W1 from TP-1). The water sample collected from the base of the UST excavation before dewatering activities reported concentrations of MTBE, TBA, and TAME at 26,000 ug/L, 6,600 ug/L, and 71 ug/L, respectively. Concentrations of TPHg, BTEX, DIPE, and ETBE were not detected above laboratory method reporting limits in any of these grab water samples. 32262 Fuel Line&USTs Upgrade Report.doc SECOR International Incorporated