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r - <br /> 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. Please report the groundwater samples for 1,2-DCA and EDB at 0.5 <br /> micrograms per liter(µg/L);if possible. <br /> Please submit an addendum to this work pian for installation of the two monitoring wells to EHD <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 /> REHS, by mail (address on letter head), by telephone at (209) 468-3456, -or by e-mail at <br /> vmccartney@sjcehd.com. <br /> Donna Heran,RENS,Director <br /> Environmental Health Department <br /> W6 <br /> Vicki McCartney,REHS Nuel C.Henderson,Jr.,RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: James L.L. Barton-CVRWQCB <br /> Joe Vasquez-Ground Zero <br /> Doug Reynolds—H&H Engineering <br /> h <br />