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18 August 2023 AdvancedGeo <br /> Project No. 17-4073 An Employee-Owned Company <br /> Page 3of7 <br /> • Permitting and pre-field work activities. <br /> • Soil boring advancement, sample collection and analysis. <br /> • Soil-vapor point installation, sample collection and analysis. <br /> • Boring abandonment <br /> • Indoor air sampling. <br /> • Report preparation. <br /> Each of the tasks is discussed in detail below. <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable soil boring permits will be obtained from the San Joaquin County <br /> Environmental Health Department (EHD). As required by EHD permitting, a health and <br /> safety plan will be prepared in accordance with Occupational Safety and Health Guidance <br /> Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety <br /> and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, <br /> 1985). Prior to drilling activities, each proposed drilling location will be clearly marked, <br /> and utility clearance obtained through Underground Service Alert. <br /> 2.2. SOIL BORING ADVANCEMENT AND SOIL SAMPLING <br /> AGI proposes to advance twelve (12) soil borings at the site utilizing a van-mounted <br /> Geoprobe 5400 direct-push probing unit equipped with 1.25-inch diameter propping rods. <br /> The Geoprobe advances soil borings using a hydraulic hammer to drive sampling tools <br /> to specified depths. Soil borings will be advanced to approximately 15 feet below surface <br /> grade (bsg) for the collection of soil samples at 5, 10, and 15 feet bsg. Proposed sample <br /> locations are depicted in Figures 2 and 3. <br /> Soil samples will be collected at discreet five-foot intervals beginning at five feet bsg using <br /> a 1 .45-inch Geoprobe soil sampling assembly loaded with a two-foot acetate liner. Upon <br /> sample retrieval, a selected portion of the liner will be cut, and the liner will be covered <br /> with Teflon sheets, capped, and sealed with tape. Each sample will be labeled with boring <br /> designation, depth, time, date, and sampler's initials. Soils encountered in the borings will <br /> be visually classified by AGI personnel in accordance with the Unified Soil Classification <br /> System (USCS). Additionally, soil samples will be field-screened for the presence of <br /> VOCs using an organic vapor meter(OVM), equipped with photo-ionization detector(PID) <br /> pre-calibrated to isobutylene. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a California Environmental <br />