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Lopez Property _ Page <br /> 1601 Turnpike Road April 2, 2009 <br /> Stockton,California 95206 <br /> Based on groundwater results submitted in the fourth quarter 2008 report, the EHD <br /> approves the following groundwater sampling schedule: <br /> • Collect groundwater samples semiannually from monitoring wells MW-1, MW-5, <br /> MW-8,MW-10, and MW-11. <br /> • Collect groundwater samples annually from MW-3, MW-4,MW-6 and MW-7. <br /> Although groundwater is currently collected annually from MW-2, resume quarterly <br /> sampling of this well since significant concentrations of contaminants of concern were <br /> detected in groundwater during the fourth quarter 2008 sampling event. The EHD will <br /> reevaluate the sampling frequency for MW-2 once analytical results become stable. Also, <br /> sample MW-9 during one additional quarterly sampling event. If groundwater results <br /> remain non-detect, this well may be sampled annually along with the other wells sampled <br /> annually. <br /> Please contact Vicki McCartney at(209) 468-9852 or by email at vmccartney[a)sicehd.com <br /> if you have any questions. <br /> �Sincerely, <br /> � <br /> I✓iS�i1P'G��/�L �'��ii"""��3����yZ%G(/cvflYt� <br /> Victoria L. McCartney,REHS6r Nuel C. Henderson, Jr.,PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Ms. Ally L. Colavita, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200,Rancho Cordova, California 95670 <br />