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Geosyntec° <br /> consultants <br /> 1. INTRODUCTION <br /> Geosyntec Consultants, Inc. (Geosyntec) has prepared this Pre-Design Data Collection Work Plan <br /> (Work Plan) on behalf of Glenn Springs Holdings, Inc. (GSH), for the Former Occidental <br /> Chemical Corporation (OCC) Lathrop Facility (Site) in Lathrop, California. The data collection <br /> activities described in this Work Plan include tasks required to support the design of an aeration <br /> system for treatment of sulfolane impacted groundwater that will be produced from the expanded <br /> eastern groundwater extraction system currently being installed at the Site. The aeration system <br /> will generally consist of a series of aboveground aeration tanks and a filtration system located on <br /> a secondarily contained concrete pad. <br /> Geosyntec is currently conducting an aeration pilot test to evaluate and optimize the design <br /> parameters required for a full-scale aeration system. Due to the time critical nature of the project, <br /> GSH has requested that Geosyntec concurrently complete critical path pre-implementation <br /> planning activities, including collection of additional information required to facilitate aeration <br /> system design. This Work Plan will be used to guide the collection of geotechnical data needed <br /> to design the aeration system tanks. <br /> 1.1 Document Organization <br /> Following this introduction, this Work Plan is organized as follows: <br /> • Section 2 provides applicable Site background,which forms a basis for the data collection. <br /> • Section 3 presents the Scope and Objectives of the investigation. <br /> • Section 4 presents the Reporting. <br /> • Section 5 presents the anticipated project schedule. <br /> • Section 6 presents the references. <br /> Pre-Design Data Collection Work Plan I July 22,2019 <br />