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California gional Water Quality Control Board <br /> Central Vallet, Region <br /> ion <br /> Katherine Hart,Chair 0 <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold <br /> Secretary forSchwarzenegger <br /> Environmental Phone(916) acerb 91•FAX(916)=164-4645 <br /> Protection http://v<tivw.w [erboards.ca.;ov/centralvalley <br /> 23 November 2010 NOV 2 9 2010 <br /> ENVIRONMENTAL HEALTH <br /> Chris Markowski PERMIT/SERVICES <br /> Project Manager <br /> 9800 Goethe Road, Box 17 <br /> Sacramento, CA 95827 <br /> DRAFT WORK PLAN FOR GROUNDWATER MONITORING WELL INSTALLATION, SOIL <br /> GAS AND GROUNDWATER INVESTIGATION, AND GROUNDWATER MONITORING, <br /> ARMY AVIATION SUPPORT FACILITY, CALIFORNIA ARMY NATIONAL GUARD, <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff has reviewed the Draft Work Plan for Groundwater Monitoring Well Installation, <br /> Soil Gas and Groundwater Investigation, and Groundwater Monitoring (Draft Work Plan) <br /> received on 25 October 2010. The California Army National Guard (CANG) proposes to install <br /> two monitoring wells to further delineate and monitor historical release(s) from former <br /> underground storage tanks (USTs) at the Army Aviation Support Facility (AASF). The Draft <br /> Work Plan also proposes to advance 40 borings to collect soil vapor and grab groundwater <br /> samples to assess the extent of volatile organic compounds (VOCs), primarily <br /> tetrachloroethene, trichloroethene, cis-1,2-dichloroethene, and carbon tetrachloride. .The <br /> VOCs appear to be associated with washrack(s) at the facility. The Central Valley Water <br /> Board staff's General and Specific Comments on the document are presented below. <br /> GENERAL COMMENTS <br /> 1. The suspected washrack, located due south of the former 20,000 gallon USTs (Figure 4), <br /> appears to coincide with the location of a secondary clarifier that was plumbed to the <br /> main washrack that was removed in the early 1990s. The former secondary clarifier is <br /> depicted on most investigation reports on the AAFS facility prior to 2008. Please confirm <br /> whether there was a washrack or secondary clarifier south of the 20,000 gallon USTs and <br /> revise the Draft Work Plan, if necessary. <br /> 2. The former USTs reportedly contained aviation fuels. Naphthalene is a common <br /> component of aviation fuel, so samples from all media should be analyzed for <br /> naphthalene as well as the proposed target compounds. Revise the Draft Work Plan to <br /> include analysis for naphthalene in all phases of investigation as well as profiling soil <br /> cuttings and decontamination water for disposal. <br /> California Environmental Protection Agency <br /> p�a Recycled Paper <br />