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. _ Clayton E O'4%L L tE♦ET,L COVtit,LTa'vT1 2.0 MANE I ENYMNMENTAL ASSESSMENT Clayton was contracted by OSH in January 1990 to conduct a Phase I environmental assessment of the subject site (Clayton Project No 27537 00, February 9, 1991). OSH - was in the process of purchasing the property from the current owner, Interland Corporation _ At that tome the site was a vacant, 40-acre parcel The land had been used primarily for agricultural purposes There had been a building that housed a bar and car maintenance shop on the southwestern comer of the parcel. This building was removed in 1985. The assessment revealed that a gasoline underground storage tank (UST) was also removed in 1986 At that tune, Kaprezlian Engineering, Inc (KEI) had been retained by Interland to install a groundwater monitoring well The well was installed to a depth of 25 feet. A water sample from the well was analyzed for total petroleum hydrocarbons (TPH) as gasoline and the volatile hydrocarbons beru.-me, toluene, ethylbenzene, and xylene (13TEX). None of these constituents were detected. ' Clayton could not find the well during the assessment. We were later informed that it had been abandoned. 17 The existence of a 5-inch diameter domestic water well was also discovered onsite 61 during the Phase I process �..-, Based on theabove findings, Clayton recommended that three groundwater ` inonitoringmells be installed on the corners of the property to establish baseline environmental conditions of the property prior to property transfer from Interland to 01�zi and construction and operation of a new facility. r zi 30 DiSTALLAMON 01 MOEMBOG W Clayton was retained by OSH to install three monitoring wells to sample and analyze soil and groundwater at the subject site (Clayton Project No 28094.00) } The locations of the three monitoring wells are shown on Figure 2. MW-3 was f ; installed adjacent to and downgradient of the former location of the gasoline underground storage tank(UST) MW-1 was installed at the northwest corner of the property to monitor any possible letiks from a UST located west of the subject site at Lepnno Checse Compimy. MW-2 was installed at the northeast comer of the Ll property to complete tt.e triangle so that groundwater gradient could be calculated. The three wells were installed on March 28, 1990. Groundwater was first encountered at 13 feet bgs_m MW-1, 8 feet bgs in MW-2, and 14 feet bgs in MW-3, although the water rose a few feet in MW-1 and MW-3. Table 1 provides details of monitoring well construction and depth to groundwater. 3.1 ANALYTICAL SAMPLING PLAN air Laboratory analyses were selected to establish a baseline environmental condition at s✓' the site, and to assess soil and groundwater for possible contamination from the 3