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Delineation and Destruction Work Plan for Well B-1 1 INTRODUCTION This delineation and destruction work plan was prepared for the destruction of shallow zone monitoring well B-1 at the Former Kearney-KPF Facility (project), located at 1624 East Alpine Avenue, in Stockton, California (project site; Figure 1, Location Map). An unidentified party released an oily substance into well B-1 without authorization sometime between July and October 2013, despite the well being secured with a locked well cap and monument. Well B-1 will be destroyed to prevent future misuse. The well destruction will be performed in accordance with the San Joaquin County(County) Well Standards (EHD 2005) and the California Department of Water Resources Water Well Standards Bulletins 74-81 (DWR 198 1)and 74-90(DWR 1991).The well will be destroyed following approval of a well destruction permit by the County Environmental Health Department(EHD). 1.1 Scope of Work and Objectives The objective for this project is to decommission shallow zone monitoring well B-1 at the site. The scope of work includes the following activities: • Initial site reconnaissance and delineation and destruction work plan preparation • Mobilization/demobilization of a drilling rig, associated equipment, and personnel • Delineation of impacts from the unauthorized release of an oily substance, including completion of three (or more, if step-outs are necessary) temporary exploratory borings for soil and groundwater sampling near well B-1 • Proper shallow zone monitoring well destruction to mitigate potential threats to the groundwater, in accordance with the County Well Standards (EHD 2005), the Department of Toxic Substances Control (DTSC) Well Design and Construction for Monitoring Groundwater at Contaminated Sites(2014),and California Department of Water Resources Bulletins 74-81 (1981) and 74-90 (1991) • Management and disposal of the investigation-derived waste (IDW) • Documentation of all site activities in a delineation and well destruction report 1.2 Well Location Well B-1 is located in County Assessor's Parcel No. 117-080-06,which is owned by Empire Real Estate and referred to as the Former Kearney-KPF Facility (Figure 2, Locations of Wells and Proposed Exploratory Boreholes). The well is approximately 275 feet south-southeast of the on- site treatment system and 385 feet east of the western property boundary. It is located within an area used for storage of drums, vehicle parts, and semitrucks and trailers. At the time of the 10886-7 DUDEK 1 January 2019