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i During the week of May 9,1997; URS Greiner, Inc. completed the PSI. The scope of the PSI included the drilling of 4 soil borings on the Nelson REady-Mix site. Soil and groundwater-grab samples were collected for analysis from each of the 4 on-site soil borings. Soil and groundwater- grab samples collected from soil boring (SB-1), drilled on the west side of the former UST excavation, and from SB-2, drilled on the east side of the former UST excavation contained elevated concentrations of TPH=as-diesel. Concentrations of TPH-as-diesel in'soil were reported as high as 6,000 mg/kg at a depth of 15 feet bgs._Concentrations of TPH-as-diesel in groundwater were reported as high as 590,000 micrograms per literj( tg/l). Benzene was also detected in groundwater at a concentration of up to 3.6 pgll.. Methyl tertiary butyl ether (MTBE) was not detected in any of the soil or groundwater-grab.samples analyzed. The soil sample analytical results are summarized in Table 1 and the groundwater-grab sample analytical results are summarized in Table 2. On May 28 and 29, 1998, Wright Environmental Services, Inc. (Wright) drilled 3 soil borings for soil and groundwater-grab sampling and 3 additional soil borings for soil sampling and the installation, development, surveying and sampling of 3 monitoring wells. The well construction details and groundwater monitoring data are included in Table 3. On February 25, 1999, Wright collected soil and/or groundwater-grab samples from five additional soil borings and monitored and sampled the three existing groundwater monitoring wells. The five soil borings were drilled with a Geoprobeo direct-push rig. +The locations of the soil borings are shown on Figure 2. The methods and findings associated with these tasks will be documented in detail, upon completion of the proposed excavation and waste management activities. 3 r