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15 January 2007 <br /> AGE-NC Project No. 99-0669 <br /> Page 2 of 10 <br /> Additionally,based on significant petroleum-impacted soil documented at the site(Site Conceptual <br /> Model, dated 08 December 2003)at depths as shallow as 10 feet bsg,the SJCEHD has directed by <br /> letter(Appendix A)that the indoor air pathway be investigated.Therefore,AGE is proposing to drill <br /> and sample seven (7) soil vapor probe borings at the site to characterize soil vapor intrusion. The <br /> scope of work for both the ground water monitoring well installs and soil vapor intrusion <br /> investigation will consist of the following tasks: <br /> • Permitting and pre-field work preparations; <br /> • Well drilling and soil sample collection; <br /> • Well installation, development and survey; <br /> • Geoprobe advancement and soil vapor sample collection; <br /> • Soil vapor sample analysis; <br /> • Review and analysis of soil vapor data and <br /> • Report preparation. <br /> 2.1. PERMITTING AND PRE-FIELD WORK PREPARATIONS <br /> A site specific health and safety plan will be prepared in accordance with Occupational Safety and <br /> Health Guidance Manual for Hazardous 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 proposed soil boring/monitoring well location will be clearly <br /> marked and an utility clearance obtained through Underground Service Alert. <br /> 2.2. WELL DRILLING AND SOIL SAMPLE COLLECTION <br /> AGE proposes to advance pilot borings for the installation of thirteen additional ground water <br /> monitoring wells on-site; seven of the thirteen are proposed within AGE's informally identified <br /> hydrogeologic unit HU2 (between 35 and 50 feet), while six of the thirteen are proposed within <br /> HU-4(between 70 and 84 feet). Monitoring wells are proposed for the following areas: <br /> • Well MW-12 will be single-completed within HU2 (screened between 40 and 50 feet),and <br /> located approximately 65 to 75 feet southwest of existing BAS well MW-1; <br /> • Clustered wells MW-13 and MW-14 will each be single-completed within HU2 (screened <br /> between 40 and 50 feet) and HU4 (screened between 70 and 80 feet), respectively, and <br /> Advanced GeoEnvironmental,Inc. <br />