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• Field Sampling p g Plan for the Former UST Location at Stockton FMS #24 California Army National Guard EXECUTIVE SUMMARY ESA This Field Sampling Plan (FSP) Addendum was prepared for the California Army National Guard (CA ARNG) under contract to the United States Army Corps of Engineers, Sacramento District. This FSP was prepared to evaluate the presence of fuels, volatile organic compounds (VOCs), and metals contamination at the former underground storage tank (UST) location at the CA ARNG Stockton Field Maintenance Shop (FMS) #24 (formerly called the Organization Maintenance Shop [OMS]). The evaluation will be accomplished by: • Drilling boreholes (using hollow -stem auger [HSA] or other similar technology) at the location of the former USTs to determine whether total petroleum hydrocarbons (TPH) as gasoline (TPHG) and diesel (TPHD), VOCs, and metals are present at the former UST location. ES.2 The Stockton FMS #24 is located at 8010 South Airport Way, Stockton, California, 95206 (Figure ES -1) and includes a former refueling area with dispenser island and USTs (removed), vehicle inspection rack, one active and one inactive oil/water separator (OWS) (also identified as clarifiers by the CA ARNG), vehicle maintenance facility, and hazardous waste storage sheds. ES.3 The area under investigation for this FSP is the former UST location at FMS #24. FMS #24 previously contained a fuel island with two associated dispensers and fuel lines and USTs for fueling privately owed and installation vehicles. The source of contamination to be investigated at this site is the former location of two former USTs (one 5,000 gallon diesel and one 10,000 gallon gasoline) and associated piping. The USTs were removed in April 1996. During removal and excavation of the USTs and associated piping, soil samples were collected, and based on soil sample analyses, releases of diesel fuel and gasoline had occurred from the two USTs (Versar, Inc., 2004). It is unknown if soil removed from the excavation was placed back into the UST excavation pit or if the remaining space was filled with clean fill material. Recommendations for investigation of the location of the former USTs are presented in Table ES -1. Table ES -1. Planned Activities for the former UST location, Stockton FMS #24 Potential Contaminant Source Area Recommendations USTs Drill five exploratory borings down to groundwater and collect soil and groundwater samples for analysis at the former diesel and gasoline UST location. In addition, hand auger one boring to 5 feet bgs and sample metals for background. Soil and groundwater samples will be analyzed for TPH as gasoline and diesel, VOCs, and metals. bgs = below ground surface FMS = organizational maintenance shop TPH = total petroleum hydrocarbons UST = underground storage tank VOC = volatile organic compound K:\Wprocess\00251\CA ARNG\Stockton FSP\FINAUStockton FSP.doc 1 August 2006