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RECEIVED <br /> ���DI DesgnsCosltancy <br /> fornaturaland <br /> JUN <br /> assets <br /> JUN 2 2 2f117 <br /> EWIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Michael Kith Arcadis U.S.,Inc. <br /> 2999 Oak Road <br /> San Joaquin County Environmental Health Department Suite 300 <br /> 600 East Main Street <br /> Stockton, CA 95202 walnut Creek <br /> California 94597 <br /> Tel 925 274 1100 <br /> Fax 925 274 1103 <br /> www.arcadis.com <br /> Subject: <br /> Well Destruction Work Plan Addendum <br /> ENVIRONMENT <br /> 4707 Pacific Avenue in Stockton, California <br /> Date: <br /> May 11, 2017 <br /> Dear Mr. Kith, <br /> Contact: <br /> On behalf of Chevron Environmental Management Company's(EMC's) affiliate, Tamera Rogers <br /> Union Oil Company of California ("Union Oil"), Arcadis U.S., Inc. (Arcadis) is <br /> pleased to submit this Well Destruction Work Plan Addendum for the above Phone: <br /> referenced site (Site; shown on Figures 1 and 2). Twenty of the 33 Site wells 408.797.2013 <br /> have already been destroyed in accordance with the June 2, 2013 Well <br /> Destruction Work Plan submitted by Stantec Consulting Services, Inc. (Stantec Email: <br /> 2013). The Site wells were destroyed between March 23 and April 21, 2015 and Tamera.Rogers@arcadis.com <br /> documented in the Well Destruction Report submitted by Stantec on June 17, our ref: <br /> 2016 (Stantec 2016b). 60035135.1515 <br /> Due to the following health and safety or logistical impediments associated with <br /> the overdrill method, the remaining groundwater monitoring wells (VW-4 and <br /> MW-15) and sparge wells (SP-1, SP-3, SP-4, SP-5, SP-6, SP-7, SP-8, SP-9, SP- <br /> 10, SP-12, SP-13)were proposed to be destroyed by blast perforation in a Work <br /> Plan Addendum submitted by Stantec on February 19, 2016 (Stantec 2016a). <br /> • VW-4 is adjacent to identified subsurface utilities that would be damaged <br /> by over drilling; <br /> • MW-15 is adjacent to a bus stop on Pacific Avenue (a major arterial roadway), and set up of a <br /> drill rig would significantly disrupt the bus route and traffic flow; <br /> • Due to the sparge wells' diameter and depth (65 feet below ground surface[bgs]), stingers could <br /> not be used to keep the drilling augers centered on the well. This issue was observed when <br /> destroying sparge wells SP-2 and SP-11. <br /> Approval to pressure grout sparge wells(SP-1, SP-3, SP-4, SP-5, SP-6, SP-8, SP-9, SP-10, SP-12, SP- <br /> 13)was provided by the San Joaquin County Environmental Health Department (SJCEHD) in a letter <br /> Page: <br /> 351515 170511-Well Destruction Work Plan Addendum_3.docx 1/4 <br />