WORK PLANS - Laserfiche WebLink

Home Browse Search

\y. 0 1E J Oneida Total Integrated Enterprises FINAL REMOVAL ACTION WORK PLAN February 13, 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: 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, 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. 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. 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. "Hazcat" field tests indicated the substance contained elevated concentrations of copper, later tentatively identified as copper sulfate, a pesticide with reportedly no other hazardous properties, but which is toxic if ingested. The areal and vertical extent was not determined, and the powder was subsequently re -buried after sampling was completed. Versar recommended removal of an estimated 100 cubic yards of copper impacted soil for disposal at a Class I landfill. In October 2005, Versar returned to the site and removed copper impacted soil with concentrations exceeding 9,200 milligrams per kilogram (mg/kg) at the three pavement upwelling areas. The final excavations measured 25 feet by 15 feet by 10 feet deep (main excavation), and 2.5 feet by 6 feet by 3 feet deep for each of the two smaller excavations. Locations of the three excavations are depicted on Figure 3 (Attachment A). Approximately 100 cubic yards (130.85 tons) of impacted soil were removed from the site and delivered to Chemical Waste Management, Inc. landfill. During excavation activities, buried debris was encountered in the southwest portion of the main excavation, later identified as aircraft parts, and stockpiled for disposal. Oneida Total Integrated Enterprises, LLC Page 1 of 4