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COLBERG BOATWORK <br /> 848 FREMONT,STOCKTON <br /> } PAGE 2 <br /> of the MTBE groundwater plume does not appear to be around MW 3. No information or <br /> analyses of the groundwater exists north and east of SB-21. The extent o£the contamination <br /> in groundwater has not been defined. <br /> Since the extent of the.MTBE contamination in groundwater has not been defined, the mass . <br /> balance calculation of MTBE in groundwater is invalid. The Central Valley Regional Water <br /> Quality Control Board also indicated in a meeting with PHS/EHD on August 23, 2000 that <br /> closure for this site is premature at this time and additional investigation is required. <br /> Additional investigation of the groundwater and installation of repeatable groundwater <br /> sampling points near SB-21 is warranted. Submit a work plan that will define the extent of . <br /> the groundwater contamination to PHS/EHD by April 1,2001. <br /> Please direct any questions to Jeffrey Wong at (209) 468-0335. <br /> Donna Heran, RENS,Director <br /> Environmental Health Division <br /> f <br /> Jeffrey,,Wong, RENSMargaret gorio,RENS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> Q RWQCB, Central Valley Region- Marty Hartzell <br /> C. GHH Engineering- Tom Ballard <br /> 8084 Old Auburn Road,Suite E,Citrius Heights,-CA 95610 <br /> i <br />