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Californ; egional Water Quality Cool Board <br /> Central Valley Region ° <br /> Karl E. Longley, ScD, P.E.,Chair <br /> o <br /> 11020 Sun Center Drive,#200,Rancho Cordova,California 95670-6114 <br /> Matthew Rodriquez (916)464-3291 °FAX(916)464-4645 Edmund G.Brown Jr. <br /> Secretary for http://www.waterboards.ca.gov/centraivalley Governor <br /> Environmental Protection <br /> RECEIVE® <br /> 16 February 2012 FEB 2 12012 <br /> ENVIRONMEND L.HEALTH <br /> PERMMSERVICES <br /> Chris Markowski <br /> Project Manager <br /> 10620 Mather Road <br /> Mather, CA 95655-4176 <br /> COPPER SULFATE IMPACTED SOIL REMOVAL, COMBINED SUPPORT AND <br /> MAINTENANCE SHOP, STOCKTON CALIFORNIA ARMY NATIONAL GUARD COMPLEX, <br /> SAN JOAQUIN COUNTY <br /> California Regional.Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff has reviewed the Copper Sulfate Impacted Soil Removal, Combined Support and <br /> Maintenance Shop, Stockton California Army National.Guard Complex (Work Plan). The <br /> Work Plan describes the proposed remedial activities to complete excavation and off-site <br /> disposal of soils impacted by copper sulfate. The California Army National Guard (CA ARNG) <br /> attempted to remove the impacted soils in 2005, but was unable to remove all of them due to <br /> funding constraints. The Work Plan proposes to complete this removal action. Central Valley <br /> Water Board staff comments on the Work Plan are provided below. <br /> Comments <br /> 1. Per our discussion at the 23 January 2012 meeting, add groundwater grab sampling for <br /> copper sulfate to the Work Plan. <br /> 2. The Work Plan currently states "confirmation soil samples will be collected from the <br /> excavation bottom and/or one sidewalls of the excavation". Samples should be collected <br /> immediately below and immediately adjacent to the areas where copper sulfate is <br /> removed. For the assumed "25 feet by 15 feet by 10 feet" excavation, samples should be <br /> collected from each sidewall and the base of the excavation. If the excavation is <br /> significantly larger or smaller, then it may be appropriate to increase or decrease the <br /> number of confirmation samples. Please modify the Work Plan accordingly. <br /> 3. Revise the Work Plan to include the reporting limits proposed for target analytes in both <br /> confirmation soil samples and groundwater grab samples. <br /> If you have any questions, please contact me at (916) 464-4733 or email me at <br /> mpierce(a)-waterboards.ca.gov. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br />