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18 August 2021 dvanc <br /> Yee-Owned Company <br /> Project No. 21-6555f <br /> Page 2 of 4 2_X <br /> vapor samples will be collected at 5 feet and 10 feet bsg in SV1 through SV3. Borings will <br /> be advanced in the following general areas at this site: <br /> • Two borings will be located approximately in the northeast and northwest corner <br /> of the building. A third boring will be located in the western portion of the building <br /> (Figure 2). <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable drilling and site assessment permits will be obtained from the EHD. As <br /> required by EHD permitting, a health and safety plan will be prepared in accordance with <br /> Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities <br /> (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard <br /> and U.S. Environmental Protection Agency, 1985). Prior to drilling activities, each <br /> proposed drilling location will be clearly marked, and a utility clearance obtained through <br /> Underground Service Alert. <br /> 2.2. SOIL VAPOR POINT INSTALLATION, SAMPLING AND ANALYSIS <br /> AGI proposes to advance three (3) soil borings (SV1 through SV3) to 10 feet bsg utilizing <br /> hand tooling. Soil-vapor samples will be collected from borings SV1 through SV3 at <br /> depths of approximately 5 feet and 10 feet bsg. <br /> The borings will be field-screened for the presence of volatile organic compounds using <br /> an organic vapor meter (OVM), equipped with photo-ionization detector (PID) pre- <br /> calibrated to isobutylene. <br /> Upon reaching total depth (10 feet bsg), approximately six inches of #2/12 sand will be <br /> placed at the bottom of the borehole for the vapor implant to be placed on. The first vapor <br /> points (10-foot point) will be installed by lowering a '/4-inch diameter, 2-inch-long <br /> polyethylene soil-vapor implant and 12 feet of '/4-inch Teflon® tubing to the base of the <br /> boring; two feet of tubing will remain outside the borehole for vapor sample collection. <br /> Once the six inches of sand, tubing and vapor implant are in place, the filter pack of#2/12 <br /> sand will continue to be added from the bottom of the boreholes to approximately 9 feet <br /> bsg. Following placement of the filter pack, approximately 12 inches of dry granulated <br /> bentonite will be placed atop the filter pack to 8 feet bsg. The remaining space between <br /> the first and second nested vapor points will be filled with hydrated bentonite to 5.5 feet <br /> bsg. <br /> The second vapor point (5-foot point) will be installed using similar procedures. <br /> Approximately six inches of #2/12 sand will be installed above the hydrated bentonite to <br /> 5 feet bsg, and a '/4-inch diameter, 2-inch-long polyethylene soil-vapor implant and 7 feet <br /> of/4-inch Teflon® tubing will be lowered to 5 feet bsg. The filter pack of #2/12 sand will <br />