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;:�--OTIE Oneida Total Integrated Enterprises REMOVAL ACTION WORK PLAN February 24, 2012 Mr. Marcus Pierce, Engineering Geologist Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, #200 Rancho Cordova, CA 95670-6114 Subject: Copper Sulfate Impacted Soil Removal Combined Support and Maintenance Shop Stockton California Army National Guard Complex 8020 South Airport Way, Stockton, California 95206 Dear Mr. Pierce: RECEIVED FEB 2 7 2012 ENVIRONMENTAL HEALTH PERMIT/SERVICES Oneida Total Integrated Enterprises (OTIE) is submitting this Work Plan on behalf of the California Army National Guard (CA ARNG), under contract W91238 -09-D-0017, Task Order 0009 with the United States Army Corps of Engineers (USACE) Sacramento District. The proposed scope of work is to properly excavate and remove soils impacted with copper sulfate within the vehicle storage area east of the Combined Support and Maintenance Shop (CSMS) at 8020 South Airport Way in Stockton, California (herein after referred to as the "site"). Site location and general facility layout are illustrated in Figures 1 and 2 (Attachment A), respectively. The Work Plan, originally submitted to the Central Valley Regional Water Quality Control Board (CVRWQCB) in draft form on 22 December 2011, has been revised pursuant to our discussion at the site on 23 January 2012, and consistent with the CVRWQCB's letter, dated 16 February 2012, requesting that the following issues be addressed: • Adding groundwater grab sampling for copper sulfate to the scope of work; • Collecting confirmatory samples from each sidewall and the base of the excavation; and • Including reporting limits for target analytes in groundwater grab and confirmatory soil samples. In addition, and pursuant to email communication of 17 February 2012 between the CA ARNG and CVRWQCB, the work plan has been revised to indicate that the target analytes for the groundwater grab samples will be dissolved copper (as a metal) and sulfate. BACKGROUND A preliminary assessment/site investigation (PA/SI) performed at the four divisional areas of the CA ARNG facility by Versar, Inc., (Versar) in February 2004 included the excavation of soil at the location of pavement upwellings in three locations within the vehicle storage area located east of the CSMS building (Versar, 2004). The objective of this portion of the work was to determine the cause of the upwellings, and to characterize the materials beneath the pavement. During excavation activities, a blueish -white crystalline powder was observed at one location. Oneida Total Integrated Enterprises, LLC Page 1 of 6