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. indicated concentrations of 1,200 mg/kg (ppm) Total Volatile Petroleum Hydrocarbons, 430 mg/kg Benzene, 69 mg/Kg Toluene and 6 0 mg/kg Total Lead The sample from beneath the 550-gallon UST had a concentration of 9 0 mg/Kg Total Lead Other analytes were not detected 1 In March 1997, WHF, Inc advanced one soil boring to 80 feet bgs in the vicinity of the former USTs Soil samples and a groundwater sample from the boring, along with a water sample from the domestic well, were submitted for laboratory analysis of Total Petroleum Hydrocarbons as gasoline(TPHg), Benzene, Toluene, Ethyl Benzene and Total Xylene isomers (BTEX), and Methyl Tertiary-Butyl Ether(MTBE) Analytical results indicated that the soil samples had TPHg concentrations of 5 7 to 1,400 mg/kg, benzene concentrations of 0 95 to 23 mg/kg, toluene concentrations of 40 to 200 mg/kg, ethylbenzene concentrations of 9 2 to 53 mg/kg, and total xylene concentrations of 80 to 410 mg/kg MTBE was not detected in the samples Analytical results of the groundwater sample indicated that it contained 53,000 gg/L TPHg, 21,000 gg/L benzene, 21,000 gg/L toluene, 1,700 gg/L Ethylbenzene, and 120,000 gg/L total xylenes None of the analytes were detected in the domestic well water sample In December 1998, BSK & Associates (BSK) advanced five borings at the Site (identified in Figure 2 as B-2 and MW-1 through MW-4) and converted four of them to monitoring wells Analytical results of soil samples from the borings are summarized in Table 1 A summary of analytical results of a groundwater grab sample obtained from boring B-2 is presented in Table 2 4.0 PURPOSE AND SCOPE tThe purpose of quarterly monitoring is to monitor trends in groundwater quality, groundwater depths, gradient, and direction of groundwater flow beneath the Site BSK performed the following tasks • Measured depth to groundwater in the four monitoring wells, • Purged and sampled the four monitoring wells and a domestic well at the Site, • Analyzed five groundwater samples for TPHg and BTEX by EPA Method 8015/8020 (Modified) and for fuel oxygenates and 1,2-DCA by EPA Method 8260, • Prepared this quarterly monitoring report summarizing the condition of the wells, depth to groundwater, groundwater gradient and flow direction, and laboratory analytical results M Staves Rep= 07400179 Third QUAW 1999 2 WN