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Y N"011 1 Ultramar, Inc. December 21, 1998 UST Closure Report Page 3 Beacon Station No. 492 400-gallon UST, one soil sample was collected from a depth of approximately six feet bgs. One soil sample from beneath each of the four dispensers was collected from a depth of approximately five feet bgs. Two samples from beneath the removed product piping line were collected from depths of approximately five feet bgs. Sample locations (illustrated in Figure 2) and sampling methodology were approved and observed in the field by Mr. Sasson of the County. Soil samples were obtained by driving brass tubes into soil brought up by the backhoe bucket. Subsequent to collection, the ends of the sample tubes were covered with Teflon film and sealed with plastic caps. The soil samples were stored in an ice chest and kept cool with "blue-ice". Soil samples were delivered to Kiff Analytical, LLC, with chain-of-custody documentation, for analyses including EPA Method 8015 for Total Petroleum Hydrocarbons as Diesel (TPHd) and TPH as gasoline (TPHg), EPA Method 8020 for benzene, toluene, ethylbenzene, and xylenes (BTEX), EPA Method 8260 for seven fuel oxygenates, and EPA Method 6010 for total lead. Analytical laboratory reports are attached. Analytical results of soil samples are summarized in Table 1. Analytical results of the water sample collected from T-4 are summarized in Table 2. Field observations indicated that soil from beneath the south end of T-1 and the northeast dispenser was impacted with petroleum hydrocarbons at the depths the samples were collected (15 and 5 feet, respectively). With approval from the County, deeper samples were collected from the two areas. One 17-foot sample (S-17-TIS) was collected from the south end of T-1, and one eight-foot and one 12.5-foot sample (S-8-DNE and S-12.5-DNE, respectively) were collected from the northeast dispenser area. Soil samples were delivered to Kiff Analytical, LLC, with chain-of-custody documentation, for analyses including TPHd, TPHg, BTEX, seven fuel oxygenates, and total lead. Analytical laboratory reports are attached. Analytical results of soil samples are summarized in Table 1. The three additional samples are identified in the table with an asterisk after their sample identifications. After tank removal and soil sampling activities were completed, the UST excavation was cleaned out to a depth of 14 to 15 feet for installation of two new 14,000-gallon USTs. SOIL STOCKPILES Approximately 640 cubic yards of soil from around and above the-UST, dispenser, and piping areas was stockpiled at the area indicated on Figure 2. Stockpile#1 was approximately,160 cubic yards in volume, stockpile#2 was approximately 25 cubic yards, stockpile#3 was approximately 400 cubic yards, stockpile #4 was approximately 50 cubic yards, and stockpile#5 was approximately 10 cubic yards. Sampling and chemical analyses were conducted as directed by Ultramar. BSK collected four samples from each stockpile. Five sets of four samples were submitted to Kiff Analytical where they were composited into five samples. Analyses included TPHg and BTEX. One sample was also analyzed for lead. Analytical Laboratory reports are attached. Analytical results are summarized in Table 1. The stockpiled soil was transported to Forward psym