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PUBLICIEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 9520 ( <br /> 209/468-3420 \c\_- 10 <br /> } err <br /> BRETT HUNTER APR 1 '' t;)5r <br /> CHEVRON USA INC <br /> P O BOX 5004 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station #9-1918 SITE CODE: 1138 <br /> 45 East Harding Way <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of the work plan prepared by Gettler-Ryan dated April 1, 1997. <br /> The work plan proposed to destroy the seven remaining groundwater monitoring wells by pressure <br /> grouting. Please be aware that generally pressure grouting is an acceptable well destruction methodology <br /> when wells are located outside an area of soil and/or groundwater contamination. <br /> Upon review of the results obtained during the installation and sampling of the wells proposed for <br /> destruction, PHS/EHD has determined the following: <br /> 1. The soil sample results obtained during the installation and/or the groundwater sample results <br /> obtained from MW3, MWl l and MW13 indicate that overdrilling is an appropriate destruction <br /> methodology. <br /> 2. The soil sample results obtained during the installation of MW7, MW10, MW12, and MW14 indicate <br /> that pressure grouting is an appropriate destruction methodology. <br /> Gettler-Ryan included a field methods and procedures description within the work plan which indicated <br /> that wells would be destroyed by overdrilling to at least one foot below the installed depth of the wells so <br /> that the casing, sand pack and sealing material are removed. Therefore, it will be unnecessary to submit a <br /> work plan addendum. PHS/EHD will amend the permits to reflect the appropriate well destruction <br /> methodology. Please submit the City of Stockton encroachment permit for the wells located in their <br /> easement. <br /> Also, you should be aware that the Central Valley Regional Water Quality Control Board has not issued <br /> concurrence requiring no further action based on available information. Should the Board determine that <br /> additional monitoring and/or some other action is required, they may direct you to install new wells. <br /> If you have any questions, please feel free to contact me at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, Senior REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> cc: Elizabeth Thayer, CVRWQCB <br /> A Division of San Joaquin County Health Care Services. <br />