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212 Industrial Drive <br /> Page 2 Of 2 <br /> • EHD concurs with Ground Zero's proposal to collect one discreet groundwater sample from <br /> each of the°deeper borings, except any to be converted to groundwater monitoring wells; <br /> however, EHD directs you to analyze the groundwater samples for 1,2-dichloroethane <br /> (1,2-DCA), and 1,2-dibromoethane(EDB)by EPA SW-846 method 8260B in addition to the <br /> proposed analyses for TPH-G by EPA SW-846 method 8015B and BTEX by EPA SW-846 <br /> method 8021. PIease report the groundwater samples for 1,2-DCA and EDB at 0.5 <br /> micrograms per liter(µg/L), if possible. <br />--�.�—_.-... 7��­,P_lease:.submit_an.Adderdtim4QJhis�worlc plan-_for_installation,of-the Awo rno itsring-wills to:EI U Y= __ <br /> by November 5,2004. Also include the groundwater analyses for 1,2-DCA and EDB at reporting <br /> limits of 0.5 µg/L. ) <br /> Should you have.any questions or concerns regarding this letter, please contact Vicki McCartney, <br /> RENS, by mail (address on letter head), by telephone at (209) 468-3456, or by e-mail at <br /> vmccartney@sjcehd.com. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> 4, 0K <br /> Vicki McCartney,REHS Nuel C. Henderson,Jr.,RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit N <br /> c: James L.L.Barton -CVRWQCB <br /> Joe Vasquez-Ground Zero <br /> Doug Reynolds—H&H Engineering <br /> 1 <br /> I <br />