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California Regional Water Quality Control Board t 'r <br /> .4`rFTo _f` <br /> Central Valley Region <br /> Linda S.AdamsR7 <br /> � Karl E.Longle � Scll P.F,. Chair Uf ��: ! Arnold <br /> SecroYNT nr 1, 12 AN/I Stprzenegger <br /> F_�nrirunmennil t nrrrnor <br /> Protecti„n Sacramento Alain Office . <br /> 11020 Sun Center Drive#200.Rancho Cordova,Cahlornia 95670-6114 <br /> Phone(9 16)464-3291 -FAX(9 16)464-4645 <br /> htip://www.waterboards.ca.gov/cenrrnlvaIlev - <br /> 6 June 2007 <br /> Mr. Joe Hofbauer <br /> Manager, Environmental Health and Safety <br /> Pioneer Companies, Inc. <br /> Houston, TX 77002 <br /> WELL ABANDONMENT WORK PLAN- PIONEER AMERICAS LLC, 26700 SOUTH BANTA <br /> ROAD, TRACY, SAN JOAQUIN COUNTY <br /> On 29 May 2007, California Regional Water Quality Control Board, Central Valley Region (Regional <br /> Water Board) staff sent you an approval letter for the Pioneer Americas LLC (Pioneer) <br /> 16 March 2007 Well Abandonment Work Plan (Work Plan). Secor International Incorporated <br /> prepared the Work Plan for the Pioneer chemical manufacturing facility (Facility) at 26700 South <br /> Banta Road in Tracy. As you know, we incorrectly referenced monitoring well MW-7 rather than <br /> MW-4 as one of the wells that Pioneer proposed for abandonment. The letter corrects that reference <br /> and replaces the 29 May 2007 approval letter. <br /> On 6 March 2007, Joe Hofbauer of Pioneer and Eva Hey of Secor International Incorporated met with <br /> me to discuss the Facility groundwater monitoring network and cleanup status. During that meeting, <br /> we discussed monitoring and reporting requirements including the adequacy of the groundwater <br /> monitoring well network at the Facility. Pioneer has defined three groundwater bearing horizons <br /> beneath the Facility: Upper, Middle, and Lower Horizons. We agreed that the network adequately <br /> characterizes the extent of constituents of concern that have migrated in groundwater within the <br /> Upper and Middle Horizons at the Facility. Furthermore, we agreed that sampling of wells MW-4, <br /> MW-5, and MW-8 are no longer needed to monitor the status of the plume within the Upper Horizon <br /> because other wells at the site are sufficient for this purpose. Monitoring wells MW-1 and MW-2 <br /> monitor the areas near MW-4 and MW-5; and MW-7 monitors for MW-8, <br /> The Work Plan proposes to abandon the Upper Horizon monitoring wells MW-4, MW-5, and MW-8. <br /> Regional Water Board staff approves this proposal. Prior to performing the work, Pioneer must <br /> obtain a Well Destruction Permit from San Joaquin County Environmental Health Department (EHD). <br /> The work must be performed in compliance with the well destruction requirements of EHD. <br /> Within 30 days following completion of the work, Pioneer must submit a report of well destruction. If <br /> you have any questions, please contact me at (916) 464-4675 or jbrownell@waterboards.ca.gov. <br /> i ; <br /> ?, James R. Brownell, R.G. <br /> Engineering Geologist <br /> cc: San Joaquin County Health Department, Stockton <br /> Eva Hey, Secor International Incorporated, Lafayette <br /> Jeff Inkes, Pioneer Americas LLC, Tracy <br /> California Environmental Protection Agency <br /> Z3Recv(led Paper <br />