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02 August 2018 <br /> AGE-NC Project No. 18-4471 <br /> Page 3 of 5 <br /> acceptable to the EHD, and will be reviewed and signed by a California Professional <br /> Geologist. <br /> 3.0. FIELD PROCEDURES <br /> All field procedures will be overseen by an AGE representative under the supervision of <br /> a California Professional Geologist. Procedures for advancing soil borings, collection and <br /> analysis of soil-vapor and groundwater samples, boring abandonment, equipment <br /> decontamination and sample handling are presented below. <br /> 3.1. DRILLING ACTIVITIES <br /> The following procedures will be performed prior to any digging/drilling activities: <br /> • Prepare a Site Health and Safety Plan in accordance with the Occupational Safety <br /> and Health Guidance Manual for Hazardous Waste Site Activities - Prepared by <br /> National Institute for Occupational Safety and Health, Occupational Safety and <br /> Health Administration, U.S. Coast Guard and U.S. Environmental Protection <br /> Agency, October 1985. <br /> • Notify the EHD a minimum of 72 hours prior to commencement of any work, <br /> following the date of issue for drilling and/or well permits. <br /> • All drilling locations will be marked at least 48 hours in advance for an Underground <br /> Service Alert (USA) check of underground utilities or pipes. <br /> 3.1.1. Soil-Vapor Boring Advancement and Sampling <br /> Soil borings for collection of soil-vapor samples will be advanced at the site to maximum <br /> depths of 20 feet bsg using a van-mounted Geoprobe® 5400 equipped with 1.25-inch <br /> probing rods. The probe rig will advance soil borings using a hydraulic hammer to drive <br /> sampling tools to specified depths. <br /> Upon reaching a total depth, each soil-vapor boring will be converted into vapor sampling <br /> points using a three-inch long vapor implant attached to '/4-inch diameter Teflon tubing. <br /> The implant and tubing will be lowered to the desired depth of each boring and filter pack <br /> material consisting of #2/12 sand will be placed from the bottom of the borehole to <br /> approximately one-foot above the vapor implant. Following filter placement, <br /> approximately one foot of dry granular bentonite will be placed above the filter pack. The <br /> remainder of the void space between the tubing and the open borehole will be filled with <br /> bentonite and hydrated at the surface. <br /> Advanced GeoEnvironmental,Inc. <br />