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Geosyntec 3043 Gold Canal Drive,Suite 100 <br /> Rancho Cordova,CA 95670 <br /> PH(916)637-8048 <br /> consultants www.geosyntec.com <br /> Site Characterization Work Plan Fifth Addendum <br /> Date: 8 April 2019 <br /> To: Sid Sewalia, Central Valley Regional Water Quality Control Board <br /> From: Nicole Gotberg P.G., Geosyntec Consultants Inc. <br /> Scott Forbess P.E.,Geosyntec Consultants, Inc. <br /> Subject: Site Characterization Work Plan Fifth Addendum, Former Occidental <br /> Chemical Corporation—Lathrop Facility <br /> Geosyntec Consultants, Inc. (Geosyntec) has prepared this Fifth Addendum to the Site <br /> Characterization Work Plan (Work Plan)on behalf of Glenn Springs Holdings, Inc(GSH), for the <br /> Former Occidental Chemical Corporation (OCC) Lathrop Facility (Site) in Lathrop, California. <br /> The Work Plan was submitted on 22 June 2018 and approved by the Central Valley Regional <br /> Water Quality Control Board (CVRWQCB) on 27 June 2018. Fieldwork for the Site <br /> Characterization work was initiated on 24 July 2018. An Addendum to the Work Plan was <br /> submitted to the CVRWQCB on 10 September 2018 documenting changes to the monitoring well <br /> design and proposing two additional borehole/monitoring well locations(Location 9 and 10). The <br /> CVRWCB approved the Addendum on 25 September 2018. A Second Addendum was submitted <br /> to the CVRWQCB on 2 November 2018 proposing additional boreholes/monitoring wells at PW2, <br /> PW35 and PW36. A Third Addendum was submitted on 8 January 2019 proposing an additional <br /> borehole/monitoring well at PW 16. A Fourth Addendum was submitted on 5 March 2019 that <br /> proposed one additional borehole/monitoring well between the Site and Lathrop Water District <br /> (LWD) water supply well LWD-6 (Location 11). The CVRWQCB approved the second through <br /> fourth addendums in a letter dated 14 March 2019. This Fifth Addendum proposes one additional <br /> borehole/monitoring well on City of Lathrop property near LWD-9. <br /> One additional borehole/monitoring well is proposed to be installed north of LWD-9 on City of <br /> Lathrop property at Location 12 (Figure 1). <br /> The drilling, sampling and well construction work will be conducted in accordance with the <br /> Work Plan and the well construction details modifications described in the First Addendum to <br /> engineers I scientists I innovators <br />