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Rainwater Canvash 0 • Page 2 of 2 <br /> 420 W. Yosemite Avenue January 16, 2009 <br /> MW-6, and MW-7A should remain on quarterly sampling frequency. Continue collecting <br /> depth to water measurements in all wells during each quarterly monitoring event to <br /> determine the groundwater gradient. <br /> Submit a site conceptual model (SCM) for your site to the EHD by March 27, 2009 that <br /> characterizes the hydrogeology for your site, and that demonstrates that vertical and <br /> lateral extents of the sorbed (impacted soil) and dissolved plumes. Utilize the SCM to <br /> predict plume response to the remediation operation and the effect on the PCE/TCE <br /> plume. If additional information is needed to prepare a predictive SCM, submit a WP to <br /> acquire the necessary data by March 27, 2009. <br /> If you have any questions, please contact Frank Girardi, Senior Registered <br /> Enviro ent I Health Specialist, at (209) 953-7868. <br /> � <br /> Frank Girardi, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> C: James Barton, RWQCB, 11020 Sun Center Dr. #200, Rancho Cordova, CA 95670 <br /> C: AGE — Daniel Villanueva, Staff Geologist, AGE, 837 Shaw Road, Stockton, CA 95215 <br />