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09 January 2017 • • AGE Project No. 00-0769 Page 3 of 9 2.0. SCOPE OF WORK Based on the analytical results of groundwater samples collected from off-site borings CPT-4, CPT-13, CPT-15, and CPT-17 (Table 2), the CVRWQCB has directed the preparation of a work plan proposing the collection of a sufficient number of groundwater samples to delineate groundwater pollution laterally and vertically to the north, northeast, east, and southeast of the site. Additionally, the CVRWQCB directed installation and sampling of permanent soil-vapor wells near on-site structures. The scope of work will include the following tasks: • Permitting and pre-field work activities; • Advancement of off-site soil borings for collection of groundwater samples; • Advancement of soil borings for installation of soil-vapor wells and collection of soil-vapor samples • Laboratory analysis of soil-vapor and grab groundwater samples; • Soil boring abandonment; and • Report preparation. 2.1. PERMITTING AND PRE-FIELD WORK PREPARATIONS Applicable site assessment permits will be obtained from the San Joaquin County Environmental Health Department (EHD); encroachment permits will be obtained from the City of Stockton Public Works Department; and AGE will attempt to secure access agreements from private property owners where borings are proposed or could potentially be advanced to reduce City permitting and fees. In addition, a site specific health and safety plan will be prepared in accordance with Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). Prior to mobilization, each soil boring will be clearly marked and a utility clearance obtained through Underground Service Alert. The EHD will be contacted at least 72 hours prior to conducting any field work. 2.2. DRILLING AND GROUNDWATER SAMPLE ANALYSIS AGE proposes to advance four (4) off-site soil borings to depths ranging between approximately 145 feet bsg and 165 feet bsg for collection of grab groundwater samples at various selected depth intervals between 50 feet bsg and 165 feet bsg. Soil borings will be advanced using a truck-mounted CME-95 drill rig equipped with either 6.25-inch or 8.25-inch hollow-stem augers or potentially direct push capability for shallow soil borings. The total depth of each boring may vary according to geologic/hydrogeologic conditions Advanced GeoEnvironmen[al Inc.