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Mr. Paul Supple <br /> Arco Station No. 6100 <br /> 25775 Patterson Pass Road <br /> Page 3 of <br /> at 111 feet below surface grade (bsg) in boring B-32/MW-1 at concentrations of <br /> 0.194 milligrams per kilogram (mg/kg) and 0.436 mg/kg, respectively. The <br /> Central Valley Regional Water Quality Control Board requires that these <br /> compounds be fully assessed prior to closure consideration. Please include <br /> 1,2-DCA and EDB in all future sample analyses. <br /> Finally, Delta identified one water supply well 2000 feet southeast of the site in <br /> the down-gradient direction. This appears to be the artesian well noted on the <br /> USGS base map utilized to plot identified wells in Appendix C. Although it does <br /> not seem likely that the release on the subject site would impact a well at that <br /> distance, there has been free product migration off-site toward the southeast of <br /> unknown extent, volume or duration; therefore, EHD requests that you verify the <br /> presence or absence of the well. If the well exists, please sample this well during <br /> your next quarterly ground water monitoring event and analyze the sample for all <br /> constituents of concern. <br /> Questions or comments may be directed to Nuel Henderson by telephone at <br /> (209) 468-3436, or by mail to the address on the letter head. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., RG Margaret Lagorio, REHS <br /> Unit IV - Site Mitigation Supervisor, Unit IV <br /> cc: James L. L. Barton — CVRWQCB <br /> Jay R. Johnson - Stratus <br />