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Ken and Ed Enditch • <br /> 101 S. Wilson Way <br /> Page 2 of 2 <br /> EHD concurs with and approves these recommendations. <br /> EHD believes that the inferred groundwater flow direction shown in Figure 3 is in <br /> error due to mistakenly contouring the —28.65 feet mean sea level (MSL) <br /> groundwater elevation in MW-1 as —29.65 feet MSL. The actual flow direction is <br /> probably the more usual east-northeast to northeast for this site. <br /> The uncertainty regarding your plume's margins and possible commingling with <br /> the 102 and/or 130 S. Wilson Way sites' plumes should be addressed through <br /> additional lateral investigation and characterization of your dissolved plume. <br /> Please submit a work plan to EHD no later than 15 August 2005 to complete the <br /> lateral characterization and delineation of your dissolved plume. Any uncertainty <br /> remaining regarding the vertical extent of your dissolved plume should also be <br /> addressed in this work plan. <br /> The proper delineation of your plume's margin is important as the information is <br /> needed to characterize your plume's behavior and to resolve the issue relating to <br /> the MTBE impacting the southwest corner of the 102 S. Wilson Way site, which <br /> does not appear to be related to the release on that site. At the current time, it <br /> seems more probable that the MTBE came from your release and/or from the <br /> release on the 130 S. Wilson Way site. Hopefully, the additional lateral site <br /> characterization of your plume can help resolve the issue. <br /> Questions or comments may be directed to the undersigned at (209) 468-3436 or <br /> by mail (address on the letterhead). <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., PG Margo, HS <br /> Site Mitigation, Unit IV Supervisor, Unit IV <br /> C: Tim Cuellar - AGE <br /> James L.L. Barton, PG - CVRWQCB <br />