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09 December 2021 <br />Project No. 14-3002 <br />Page 5 of 9 <br /> <br />3.1. PRE-FIELD WORK ACTIVITIES <br /> <br />Applicable drilling permits will be obtained from the EHD. In addition, a health and safety <br />plan will be updated 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 mobilization, each proposed trench and boring location will be clearly <br />marked, and a utility clearance obtained through Underground Service Alert. <br /> <br /> <br />3.2. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> <br />Prior to use, all non-disposable sampling tools used for sample collection will be <br />thoroughly rinsed with clean water after being washed with a solution of Alconox, if <br />necessary. All tools will be cleaned prior to advancement at each boring location. Soil and <br />rinseate generated during drilling activities will be containerized in properly labeled <br />Department of Transportation (DOT)-approved 55-gallon drums and stored on-site in an <br />area generally lacking public access. Disposal alternatives will be evaluated at a later <br />date based on laboratory results of soil and water. <br /> <br /> <br />3.3. REPORT PREPARATION <br /> <br />Upon completion of the proposed field work and receipt of final laboratory analysis, a site <br />assessment report will be prepared, summarizing this scope of work. Conclusions, <br />applicable recommendations, maps, cross-sections, and an updated conceptual site <br />model will be included in the report. The report will be in a format acceptable to the <br />USEPA and CVRWQCB and will be reviewed and signed by a California Professional <br />Geologist. <br /> <br /> <br />4.0. FIELD PROCEDURES <br /> <br />All field procedures will be overseen by an AGI representative under the supervision of a <br />California Professional Geologist. Procedures for surface sample collection, trenching, <br />boring advancement, and sample collection are described below. <br /> <br /> <br />4.1. SURFACE SAMPLE COLLECTION AND ANALYSIS <br /> <br />Prior to trench excavation, surface samples will be collected in the proposed locations of <br />the trenches to be excavated at the Site (Figure 4). Two surface samples per trench will <br />be collected to determine PCB concentrations in surface soils before excavating and <br />disturbing the ground. Surface samples will be collected at six (6) inches bsg using a hand <br />trowel. Soil encountered will be visually classified by AGI personnel in accordance with <br />the Unified Soil Classification System (USCS). Surface samples will be hand-packed into