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WATERLOO FOOD AND FUEL UST REMOVAL PAGE 2 The brown, sandy backfill around the three gasoline USTs was generally excavated to the level of the bottom of the USTs at a depth of approximately i 1 feet below ground surface (bgs). Gray-stained backfill was noted in the northern half of the UST T-2/T-3 basin and the north wall of the UST T-1 basin. No groundwater was present in the excavation. The gasoline product lines were buried approximately one to two feet bgs at the locations shown on Figure 1. Gray stained soil was noted in soil below the product lines especially along the east-west run south of the dispenser islands. At the direction of a representative from the San Joaquin County Public Health Services- Environmental Health Division (SJCEHD), 19 soil samples were collected from below the USTs and product lines, and from soil stockpiles (Figure 1). Seven soil samples (PL-1 through PL-7) were collected from below the former product lines. Six soil samples(T-1-N, T-1-S, T-2 N, T-2-S, T-3 N and T-3-S) were collected from approximately 13 to 15 feet bgs below the former gasoline USTs. One soil sample (T-4) was collected from approximately seven feet bgs from below the waste oil UST. Five soil samples (SP-1 through SP-5) were collected from the soil stockpiles. The soil samples were collected using industry-standard sampling and sample handling procedures. The soil samples were collected in two-inch diameter brass sleeves and sealed with Teflon sheet and plastic end caps. The samples were cooled and delivered, under chain-of-custody documentation, to Alpha Analytical, Inc. in Sparks, Nevada for chernical analysis. The soil samples collected from below the gasoline USTs, the product lines and soil stockpiles from the gasoline UST excavations were analyzed for the following: • total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 modified; • benzene, toluene, ethylbenzene, m,p-xylenes, o-xylenes (BTEX), five oxygenates (methyl tertiary- butyl ether[MTBE], tertiary butyl alcohol [TBA], di-isopropyl ether[DIPE], ethyl tertiary-butyl ether [ETBE] and tertiary amyl methyl ether [TAME])by EPA Method 8260; and • total lead (Pb) by EPA Method 3050/ICP-MS. The soil samples collected from below the waste oil UST and from the waste oil UST soil stockpile were analyzed for the following: • total petroleum hydrocarbons as diesel (TPHd) and TPHg by EPA Method 8015 modified; • oil and grease (O&G) by EPA Method 5520; • BTEX and volatile organic compounds (VOCs) by EPA Method 8260; • Leaking Underground Fuel Tank (LUFT) Manual five metals: cadmium (Cd), chromium (Cr), lead (Pb), nickel (Ni) and zinc (Zn) by EPA Method 200.7/200.8; and • Semi-volatile organic compounds (SVOCs) by EPA Method 8270. • total lead (Pb) by EPA Method 3050/ICP-MS.