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Clayton EM 1ROwE.,TALL CONSULTANT5 2.0 PHASE I RONMENTAL ASSESSMENT Clayton was contracted by OSH in January 1990 to conduct a Phase I environmental assessment of the subject site (CIayton Project No. 27537.00, February 9, 1991). OSH was in the process of purchasing the property from the current owner, Interland Corporation. At that time the site was a vacant, 40-acv,- 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 corner of the parcel. This building was removed in 1986. The assessment revealed that a gasoline underground storage tank (UST) was also removed in 1986. At that time, Kaprealian Engineering, Inc. (KEI) had been retained by Interland to install a groundwater mcnitoring 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 benzene, toluene, ethylbenzene, and xylene (BTEX). None of these constituents were detected. + ( Clayton could not find the well during the assessment. We were later informed that it had been abandoned. ( T,te existence of a 6-inch diameter domestic water well was also discovered onsite i during the Phase I process. t --� Based on the above findings, Clayton recommended that three groundwater monitoring wells be installed on the corners of the property to establish baseline environmental conditions of the property prior to property transfer from Interland to OSH and construction and operation of a new facility. , 3.0 INSTALL O a>� MONIT®RING WELLS Mw-i MW-2 AND MW 3 +* 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 installed adjacent to and downgrad;'ent of the former location of the gasoline j: underground storage tank (UST). 11_W-1 was installed at the northwest corner of the property.to monitor-any....possibleleaks from a-UST.located west of the subject site at Leprino Cheese Company. MW-2 was installed at the northeast corner of the r property to complete the triangle so that groundwater gradient could be calculated. The three wells were installed on March 28, 1990. Groundwater was first encountered at 13 feet bp in 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 con=c.tion and depth to groundwater. 3.1 ANALYTICAL SAMPLING PIAN Laboratory analyses were selected to establish a baseline environmental condition at 11,ME, .,1 the site, and to assess soil and groundwater for possible contamination from the 3 .f �asoo.o�.rsP.