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1. INTRODUCTION <br /> Geosyntec Consultants, Inc. (Geosyntec) has prepared this Site Characterization 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. This Work Plan was <br /> prepared to address data gaps identified in the current conceptual site model (CSM) regarding the <br /> extent and potential transport pathways of sulfolane between the on-Site source area and the J.R. <br /> Simplot Company (Simplot)and Lathrop Water District(LWD)water supply wells located east <br /> of the Site. <br /> The Site is approximately 341 acres and is located at 16777 Howland Road in Lathrop, <br /> California(Figure 1). Previous assessment work identified the fumigants 1,2-dibromo-3- <br /> chloropropane (DBCP) and ethylene dibromide(EDB) as constituents of concern (CDCs) for the <br /> former OCC Facility, and a groundwater extraction and treatment system for DBCP and EDB <br /> was installed at the Site in 1982 (Figure 2; Conestoga-Rovers& Associates [CRA], 2008). <br /> Environmental investigations identified sulfolane as a COC from the former OCC operations, <br /> and in 1992 the treatment system was modified to include the treatment of sulfolane (Ying, <br /> 1994). <br /> Site Characterization Work Plan I June 22,2018 <br />