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1 • 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 ' In March 1997, AW, 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 for the soil samples revealed TPHg concentrations of 5 7-1,400 mg/Kg, Benzene concentrations of 0 95-23 mg/Kg, Toluene concentrations of 40-200 mg/Kg, Ethyl Benzene concentrations of 9 2-53 mg/Kg, and total Xylene concentrations of 80-410 mg/Kg ' MTBE was not detected in the samples Analytical results for the groundwater sample showed 53,000,ug/L (ppb) TPHg, 21,000 µg/L ' Benzene, 21,000,ug/L Toluene, 1,700/,4g/L Ethyl Benzene, and 120,000,ag/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 for soil samples from the borings are summarized in Table 1 Cumulative analytical results for groundwater samples obtained from the Site are summarized in Table 2 Cumulative groundwater elevation data from the monitoring wells is presented in Table 3 1 4.0 PURPOSE AND SCOPE ' The 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 four monitoring wells on June 19, 1999, ' • Purged and sampled the four monitoring wells and a domestic well at the Site, • Analyzed five groundwater samples for Total Petroleum Hydrocarbons as gasoline ' (TPHg) and Benzene, Toluene, Ethyl benzene, and Total Xylenes (BTEX) using EPA Method 8015/8020 (Modified) and for fuel oxygenates 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 • 2 Qusrtrrly Moni=n8 Report-07400178 Seeond Qu=cr 1999