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/*II% Californitegional Water Quality CoiVol Board <br />Central Valley Region <br />Karl E. Longley, ScD, P.E.,Chair <br />11020 Sun Center Drive, #200, Rancho Cordova, California 95670-6114 <br />(916) 464-3291 • FAX (916) 464-4645 <br />http://www.waterboards.ca.govicentralvalley <br />Edmund G. Brown Jr. <br />Governor <br />Matthew Rodriquez <br />Secretary for <br />Environmental Protection <br />RECEIVED <br />16 February 2012 FEB 2 1 2012 <br />ENVIRONMENTAL HEALTH <br />PERMIT/SERVICES <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 />Cornments <br />Per our discussion at the 23 January 2012 meeting, add groundwater grab sampling for <br />copper sulfate to the Work Plan. <br />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 />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@waterboards.ca .00v. <br />California Environmental Protection Agency <br />Ci Recycled Paper