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Ak, I rce7 <br />A S S O C I A T E S I N C <br />Discoloration of soil and a petroleum hydrocarbon odor were noted in the field After the tanks <br />were removed, the areas of the former tanks were backfilled <br />On April 23, 1998, an ATC geologist supervised the advancement of six soil borings to 21 feet <br />below ground surface (bgs) Soil borings SB 1, SB2, and SB4 were placed in the vicinity of the <br />former USTs, soil boring SB3 was placed in the vicinity of the former dispenser, and soil borings <br />SB5 and SB6 were placed at the southern edge of the former excavation area A site plan with <br />soil boring locations is shown on Figure 2 Soil samples and grab groundwater samples were <br />collected from each boring Analytical results indicated that the soil samples and the groundwater <br />sample from boring SB6 contained detectable concentrations of petroleum hydrocarbons The <br />work is summarized in ATC's Summary Report of Subsurface Investigation, dated June 17, 1998 <br />On September 21, 1998, an ATC geologist supervised the advancement of five soil borings to <br />depths ranging from 5 to 31 feet below ground surface (bgs) Soil borings SB7 through SB 11 <br />were placed south and east of boring SB6 which was completed in April 1998 and contained <br />detectable concentrations of petroleum hydrocarbons Analytical results of soil samples indicated <br />the presence of petroleum hydrocarbons One groundwater sample was collected from each <br />boring at the depth groundwater was first encountered Groundwater samples indicated the <br />presence of petroleum hydrocarbons Results are summarized in ATC's Summary Report of <br />• Additional Subsurface Investigation, dated November 4, 1998 <br />SCOPE OF WORK <br />Planning and Permits <br />ATC has completed the well installation permit application for the proposed subsurface <br />investigation The permit application and associated fees (check no 188) are attached to this <br />workplan ATC will also schedule field personnel and equipment, notify Underground Services <br />Alert to locate underground utilities as required, and perform any other necessary field <br />preparation and fob start-up activities <br />Installation of Soil Borings and Monitorin-a Wells <br />Two soil borings will be advanced using a hollow stem auger equipped drill rig to depths of <br />approximately 35 feet bgs One soil boring will be advanced to approximately 45 feet bgs using <br />continuous core methodologies to collect undisturbed soil samples and obtain more exact <br />lithological data The soil samples from the remaining two soil borings will be collected at five <br />foot intervals or significant changes in lithology Drilling will be conducted by a State licensed <br />(C57) drilling company A field geologist will be present to log all drill cuttings and soil samples <br />Each soil sample will be field screened with a Photoionization Detection (PID) meter or similar <br />instrument and at least two samples from each of the three borings, based on field observations <br />. (i a odor, discoloration, PID readings), will be placed in a cooler with ice and submitted for <br />laboratory analysis <br />w 114981Veporlslwkpwe1 doc 2 <br />