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25 October 2016 <br />AGE Project No. 11-1847 <br />Page 2 of 8 <br />and the advancement of four (4) off-site and downgradient soil borings to depths of <br />approximately 125 feet bsg. The proposed groundwater monitoring wells/downgradient <br />soil borings will assess off-site potential groundwater hydrocarbon impact to the aquifer <br />groundwater zone, resulting from the previously installed leaking UST's. <br />Additionally, the scope of work will include the drilling of one (1) 20-foot soil boring to <br />evaluate for waste oil (i.e. adjacent to Tank #1), and the drilling of three (3) 5-foot soil <br />borings to evaluate the site's dermal contact risk from soils between 0-5 feet <br />The scope of work will include the following tasks: <br />Permitting and pre-field work activities; <br />On-site, drilling and soil sample collection; <br />Off-site, downgradient soil boring advancement; <br />Monitoring well installation and development; <br />Laboratory analysis of soil and grab groundwater samples; <br />Preparation of a report of findings. <br />2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br />Applicable drilling/well installation permits will be obtained from the San Joaquin County <br />Environmental Health Department (EHD), while encroachment permits will be obtained <br />from the City of Stockton Public Works Department. In addition, an update to the health <br />and safety plan presently on-file will be prepared in accordance with Occupational Safety <br />and Health Guidance Manual for Hazardous Waste Site Activities (National Institute for <br />Occupational Safety and Health Administration, U.S. Coast Guard and U.S. <br />Environmental Protection Agency, 1985). Prior to mobilization, each proposed boring/well <br />locations will be clearly marked and a utility clearance obtained through Underground <br />Service Alert. <br />2.2. DRILLING AND SAMPLE ANALYSIS <br />AGE proposes to advance two (2) off-site soil borings to depths of approximately 100 feet <br />bsg for the purpose of logging lithology and for installation of deep groundwater <br />monitoring wells; AGE proposes to advance one (1) off-site soil boring to a depth of <br />approximately 40 feet bsg for the installation of one shallow groundwater monitoring well; <br />AGE proposes the drilling of four (4) soil borings to depths of approximately 125 feet bsg <br />for the purpose logging lithology and for collection of shallow, intermediate and deep grab <br />groundwater samples. <br />Soil borings will be advanced using a truck-mounted drill rig equipped with either 6.25- <br />inch or 8.25-inch hollow-stem augers; at depths less than 20 feet bsg, a van-mounted <br />Advanced GeoEnvironmental Inc