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Mr. Russell Chapin <br /> 1766 W. Monte Diablo Avenue <br /> Page 2 of 2 <br /> oxidation/reduction potential, should be obtained at or near the purge depth immediately <br /> before and following purging. Intuitively, the purge depth should be coincident with the <br /> most permeable strata encountered by the well screen. The WP and Addendum are <br /> approved, but please inform the EHD of the planned purge depth for each well prior to <br /> initiation of this monitoring program. <br /> Please conduct the next monitoring event, collecting both natural attenuation parameters <br /> and contaminant analytical samples, immediately following shutdown of the groundwater <br /> extraction system. Notify the EHD a minimum of 48 hours prior to any planned field <br /> activities. Questions and/or comments may be directed to Nuel Henderson at <br /> (209) 468-3436. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., PG / Margaret agorio, REHS <br /> Unit IV - Site Mitigation, LOP Supervisor, Unit IV, LOP <br /> C: Mr. James L.L. Barton —CVRWQCB <br /> Mr. Dennis Parfitt- SWRCB <br /> Mr. William Little - AGE <br /> Supervisor Victor Mow— San Joaquin County Board of Supervisors <br />