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Ms. Kasey Foley Fuel System Upgrade Report September 22, 2003 Page 2 SITE LOCATION AND FACILITY DESCRIPTION The site is located at the southern corner of the intersection of Grant Line Road and Joe Pombo Parkway in Tracy, California. Access to the property is provided by Joe Pombo Parkway to the southeast and from Grant Line Road to the northwest. The site is located in a mixed residential and commercial area. The site is occupied by an operating 7-Eleven convenience store, which is located along the southwestern portion of the property. Three USTs are located in one common excavation in the southeastern portion of the property between the 7-Eleven convenience store and the approach on Joe Pombo Parkway (Figure 2). The concrete drive slab and six dispenser islands are located adjacent and north of the USTs. The dispenser islands and UST areas are paved with concrete, and the remainder of the site is surfaced with asphalt. The UST concrete pad and portions of the dispenser islands were removed during the fuel system upgrade activities. FIELD ACTIVITIES Dispenser and Fuel Line Soil Sample Collection and Analyses Under the direction of a SJCEHD representative, SECOR's field scientist collected a total of ten soil samples on May 2 and 3, 2003 from native soil beneath the product lines (L1 through L4) and dispensers (D1 through D6) at depths between 3.5 feet and 4.5 feet below ground surface (bgs). Each soil sample was screened for hydrocarbon vapors using a portable photoionization detector (PID). Soil samples were collected in clean, 2-inch diameter by 6-inch-long brass sample tubes. A SECOR scientist used a hand auger to extract soil then, pounded a sample tube into the soil in the center of the auger. The sample tube was filled completely with soil to minimize headspace and sealed using Teflon® sheeting and plastic end caps. Each soil sample was labeled and placed in a cooler on ice for delivery to Kiff Analytical (Kiff) in Davis, California. All soil sampling equipment was cleaned with a non-phosphate detergent solution and rinsed with tap water followed by a distilled water rinse to reduce the possibility of cross-contamination between sample locations. Soil sample locations are shown on Figure 2. Copies of the field notes are included in Attachment B. Soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl t-butyl ether (MTBE), di-isopropyl ether (DIPE), tert- amyl methyl ether (TAME), ethyl-t-butyl ether (ETBE), and tert-butyl alcohol (TBA) using Environmental Protection Agency (EPA) Method 8260B. Soil samples were also analyzed for total lead using EPA Method 6010B. Tank Pit Observation Well Groundwater Sample Collection and Analyses During fuel line and dispenser upgrade activities on May 3, 2003, SECOR personnel collected grab water samples (W1 and W2) from two tank pit observation wells (TP-1 and TP-2, Figure 3). Depth to bottom of wells TP-1 and TP-2 were measured between 11 feet and 12 feet bgs. Groundwater samples were submitted to Kiff for analysis of TPHg, BTEX, MTBE, DIPS, TAME, ETRE, and TBA using EPA Method 8260B. Copies of the field notes are included in Attachment B. 32262 Fuel Line&USTs Upgrade Report.doc SECOR International Incorporated