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Extraction Well Installation Summary Report and Injection ARCADIS Well Installation Work Plan Former Occidental Chemical Corporation Facility Lathrop, California • The current property owner, Simplot,was contacted to discuss the presence of utilities in the vicinity of the proposed work. • Underground Service Alert was contacted in accordance with local notification requirements. • A private utility locator was contracted to assess the presence of potential underground utilities in the vicinity of the boring locations. • Each boring location was cleared to a depth of approximately 5 feet below ground surface(bgs) using an air knife. • The Site-Specific Health and Safety Plan, dated September 23,2011 (ARCADIS 2011), outlining the general health and safety procedures followed at the Site was reviewed by ARCADIS field staff and the subcontractor's field staff. Potential health and safety concerns specific to the proposed investigation activities are addressed in the Standard Operating Procedures provided in Appendix B of the Site-Specific Health and Safety Plan. 2.2 Field Activities The field procedures summarized in this section were implemented to complete the well installation activities in accordance with the work plan(ARCADIS 2012a)and addendum (ARCADIS 2012b).Wells were completed in accordance with Section 4.7 of the SJCEHD well standards, which is included in Appendix A. Well installation activities were conducted by Cascade Drilling, L.P. (Cascade)of Rancho Cordova, California using a mud rotary drill rig [for wells EW-12A, EW-12B, EW-12B(R), EW-13, EW-14A, EW- 14B, EW-15A, EW-15B] and a hollow-stem auger(HSA)drill rig(for wells EW-10, EW-11,and EW-17), which operated under the oversight of an ARCADIS geologist from December 19, 2012 through March 23, 2013.Well construction logs are presented in Appendix B. Extraction wells EW-12A, EW-14A, and EW-15A were constructed with screened intervals within the shallow and intermediate depth intervals. EW-13 was screened in the intermediate groundwater zone. Extraction wells EW-12B(R), EW-1413, and EW-15B were screened in the deep groundwater zone. EW- 10, EW-11, and EW-17 were screened in the water-table groundwater zone. Extraction well screen intervals and groundwater zones are listed in Table 1. lathmp well inS Raton report fnal_(04-2413)docx 2