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Ms. Kasey Foley Fuel System Upgrade Report September 22, 2003 Page 4 Soil Sample Collection from Sidewalls and Beneath USTs On June 2, 2003, a total of nine UST confirmation soil samples (designated T1-10' through T9-14.0') were collected from native soil adjacent to and underlying the middle and ends of the three USTs (Figure 2). The samples were collected at approximate depths of 10 feet, 14 feet, and 14.5 feet bgs. An excavator was used to retrieve the native soil from the tank pit floor. Samples were collected in clean 2-inch diameter brass sample liners that were driven into the native soil held in the excavator bucket. 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 in Davis, California. Minor soil discoloration was observed in soil in the sidewall of the northeast end of the excavation. Slight petroleum odors were noted during the collection of tank pit soil samples. Soil sample locations are shown on Figure 2. Copies of the field notes are included in Attachment B. UST Replacement Activities Between June 3 and July 9, 2003, Glacier installed three new double-walled fiberglass USTs (one 15,000-gallon UST and two 10,000-gallon USTs). Associated product piping, dispenser pans, and turbine sumps were also replaced; and the vent line slope was modified. In order to accommodate the new USTs, Glacier excavated soil and pea gravel from the original tank pit, which expanded the UST pit slightly to the south. The soil was stockpiled on-site and profiled prior to disposal at the Forward Landfill Facility(Forward) in Manteca, California. During UST removal activities, tank pit observation points TP-1 and TP-2 were removed. During the installation of the new USTs, a new tank pit observation point was installed in place of the former location of TP-1. Referred to as TP-1, the new well was constructed with 6-inch diameter PVC that is screened from 10 feet to 15 feet bgs. The well was sealed with 3 inches of bentonite from 1.0 foot to 0.75 feet bgs, followed by neat cement from 0.75 feet to 0.5 feet bgs. The well contains a locking expansion cap, and is secured at grade within a water-tight well box. Following the completion of UST replacement activities, future remediation lines, which consist of two 2-inch diameter and one 1-inch diameter PVC lines, were stubbed up in the well box for TP-1. The remediation piping was installed along west side of the USTs, extending approximately 90 feet south of TP-1 and stubbed up adjacent to the air/water service area (Figure 3). Copies of the field notes are included in Attachment B. ANALYTICAL RESULTS Soil and groundwater analytical results are discussed below, presented in Tables 1 and 2, and are illustrated on Figures 2 and 3. Copies of laboratory analytical reports, and chain-of-custody documentation are included in Attachment D. 32262 Fuel Line&USTs Upgrade Report.doc SECOR International Incorporated