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le <br /> v <br /> A S S O C I A T E S I N C <br /> detectable concentrations of petroleum hydrocarbon constituents. The excavations were <br /> subsequently backfilled. <br /> In October 1997, ATC supervised the advancement of seven soil borings to approximately 20 to <br /> 31 feet below ground surface (bgs). Six soil borings were advanced in the area of the former <br /> 10,000-gallon diesel UST and one soil boring was advanced in the area of the former 750-gallon <br /> UST. Analytical results of soil samples and grab groundwater samples indicated that soil and <br /> groundwater in the area of the former 10,000-gallon diesel UST were impacted by petroleum <br /> hydrocarbons. Analytical results of soil samples and the grab groundwater sample in the area of <br /> the former 750-gallon UST contained low levels of petroleum hydrocarbons. Site activities were <br /> summarized in Smith Technology's Summary Report for Subsurface Investigation, dated <br /> November 24, 1997. Smith Technology concluded that no further action be required in the area <br /> of the former 750-gallon UST and PHS/EBD agreed with this conclusion in correspondence <br /> dated February 18, 1998. <br /> SCOPE OF WORK <br /> Plannin and Permits <br /> ATC has completed the soil boring permit application for the proposed subsurface investigation. <br /> The permit application and associated fees (check no. 128) are attached to this workplan. ATC <br /> will also schedule field personnel and equipment, notify Underground Service Alert to locate <br /> underground utilities as required, and perform any other necessary field preparation and job start- <br /> up activities. <br /> Installation of Soil Borings and Monitoring Wells <br /> Three soil borings will be advanced employing stem hollow auger to depths of approximately 28 <br /> feet bgs. Drilling will be conducted by a State licensed (C57) drilling company. A field geologist <br /> will be present to log all soil samples. Descriptions of soil types encountered and sample <br /> collection intervals will be recorded on boring logs. Soil samples will be collected at five-foot <br /> intervals or at changes in the lithology. Each soil sample will be field screened with a <br /> Photoionization Detection (PID) meter or similar instrument and at least two samples from each <br /> of the three borings, based on field observations (i.e. odor, discoloration, PID readings), will be <br /> placed in a cooler with ice and submitted for laboratory analysis. <br /> Placement of Borings and Wells <br /> To determine the extent of soil and groundwater contamination in the area of the former 10,000- <br /> gallon diesel UST, three soil borings will be advanced to approximately 28 feet below ground <br /> surface(bgs). One boring will be located in the center of the former 10,000-gallon UST location, <br /> one boring will be located downgradient from the former tank location approximately 10 feet <br /> away from the former excavation, and one boring will be located upgradient from the former <br /> w:1625001reporlslwkpwc1.doc 2 <br />