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ARCO Service Station No. 2186 Page 3 <br /> 3212 North California Street December 3,2008 <br /> Stockton,California 91570 <br /> Vapor wells VW-1B through VW-313 and VW-4 were not sampled during the second <br /> quarter 2008 sampling event. These wells must be sampled quarterly. Also, the EHD is <br /> not being notified of quarterly groundwater monitoring events. You must inform the <br /> EHD at least seventy-two hours prior to the sampling event so an inspector can be <br /> present. <br /> The EHD has reviewed the data submitted in Quarterly Groundwater Monitoring and <br /> Remediation Progress Report Second Quarter 2008, dated August 29, 2008. Although <br /> depth-to-water measurements were not taken for vapor wells VW-1A and B, VW-2A and <br /> B, and VW-3A and B, depth-to-water measurements for the remaining wells ranged from <br /> approximately forty-one to forty-three-and-a-half feet bsg. This indicates that <br /> groundwater is above the screened intervals for wells VW-113, VW-213, and VW-313, <br /> making it impossible to perform the functions for which these wells were intended. <br /> Continue to sample these wells quarterly but shut down the soil vapor extraction (SVE) <br /> system since data show the SVE system has reached asymptotic recovery levels. <br /> By letter dated August 22, 2008, the EHD first suggested implementing groundwater <br /> batch extraction using replacement wells for MW-1 to remove additional petroleum <br /> hydrocarbon mass from the groundwater. The EHD will not expect a response to this <br /> recomincndation until after the new wells have been installed and data are made available <br /> from the newly installed wells. <br /> If you have any questions regarding this letter, please contact Vicki McCartney, Senior <br /> Registered Environmental Health Specialist, at (209) 468-9852, or by email at <br /> vinr-cartncy@sjcelid.com. <br /> Sincerely, <br /> 0 . <br /> Victoria L. McCartney, Senior <br /> REH S Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Rusty Benkosky, PE, SECOR International Incorporated, 3017 Kilgore Road, <br /> Suite 100, Rancho Cordova, California 95670 <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 <br /> 95670 <br />