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30 November 1998 <br /> AGE-NC Project No. 98-0520 <br /> ' Page 2 of 9 <br /> ' If significant hydrocarbon-impacts are encountered, a second phase of investigation will be <br /> performed for the installation of at least three ground water monitoring wells. The investigation of <br /> the extent of petroleum hydrocarbons at the site will consist of the following tasks: <br /> ' • Permitting and pre-field work activities; <br /> • Soil sample collection and analysis; <br /> • Ground water sample collection and analysis; <br /> ' • Monitoring well installation and sampling (if appropriate); and <br /> • Reportpreparation. <br /> ' <br /> . 2- .1. PERMITTING AND P - <br /> RE FIELD WORK ACTIVITIES <br /> ' Applicable site assessment permits will be obtained from the PHS-EHD. As required by PHS-EHD <br /> permitting, a health and safety plan will be prepared in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazaf•dous Waste Site Activities (National Institute for-Occupational <br /> Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> 1985). Prior to mobilization, each soil probe location will be clearly marked and an utility clearance <br /> obtained through Underground Service AIert. <br /> 2.2. SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Initially, AGE proposes to advance four soil probe borings in the vicinity of the former USTs to <br /> ' evaluate the lateral and vertical extent of petroleum hydrocarbon impaction. Proposed probe boring - <br /> locations are illustrated in Figure 2. <br /> ' Two soil probe borings are proposed'to be advanced near former gasoline USTs Tank No. I and <br /> No. 2. One soil probe boring is proposed to be advanced within the former waste oil UST Tank No. 3 <br /> excavation and one soil probe boring will be advanced northwest of the former dispenser islands <br /> ' (Figure 2). <br /> All.probe borings are proposed to be advanced to the. water table, approximately 20 feet bsg. <br /> ' However, total depths of probe borings will be based on field observations and field screening using ' <br /> an organic vapor monitor (OVM). If necessary, one soil probe boring may be advanced to a depth <br /> of 40 feet bsg to evaluate the vertical extent of hydrocarbon-impaction. Soil samples will be <br /> ' collected from each probe boring at five-foot intervals from ground surface to the total depth of the <br /> boring. Field procedures for advancement of probe borings and collection of soil samples are <br /> . presented in Sections 3.1 and Section 3.2, respectively. <br /> Advanced GeoEnN ironmental,Inc. <br /> 1 <br />