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i 11 Environmental Hazardous Materials Assessment Work Plan ACE Equipment Maintenance Facility,Stockton,CA Page 3 photoionization detector (PID). Following completion of the sampling, the boreholes will be filled with neat cement. 3.3 SOIL SAMPLING General Railroad Use Soil samples will be collected from the 18 borings. The soil samples will be logged according to the Unified Soil Classification System. Geological logs will be prepared containing field observations including soil type, estimated moisture content, PID measurements, and the presence of staining or odor. Two soil samples will be collected from each boring: one at the ballast/native soil interface and one at a minimum depth of five feet below this interface.The soil samples will be retained, undisturbed, in the liners or brass sleeves. Each sample end will be covered with Teflon® sheeting, the ends sealed with plastic end caps, and labeled. The soil samples will be stored in a cooler chilled with ice and delivered under chain-of-custody procedures to a California Certified Laboratory and analyzed using U.S. EPA Methods and California-approved methods under quality assurance measures. Seven borings will be advanced to groundwater (approximately 30 to 40 feet below ground surface) to obtain groundwater samples. Groundwater samples will be collected in 40-milliliter glass volatile organic analysis (VOA) containers, capped, and labeled. The groundwater samples will be stored in a cooler chilled with ice and delivered under chain-of-custody procedures to a California Certified Laboratory and analyzed using U.S. EPA Methods and California-approved methods under quality assurance measures. Aboveground Storage Tanks One soil sample will be collected from each angled boring from beneath the centerline of the ASTs. The soil samples will be retained, undisturbed, in the liners. Each sample end will be covered with Teflon® sheeting, the ends sealed with plastic end caps, and labeled. All soil samples will be stored in a cooler chilled with ice and delivered under chain-of-custody procedures to a California Certified Laboratory and analyzed using U.S. EPA Methods and California-approved methods under quality assurance measures. Prior to each use, the soil sampling equipment will be decontaminated by washing in a solution of laboratory-grade,non-phosphate detergent and deionized water, and double rinsing with deionized water. One equipment blank will be collected each field day and submitted to the analytical laboratory to ensure decontamination procedures are effective. The laboratory will also provide a trip blank for each field day to confirm that samples are not exposed to contaminants after collection. The soil cuttings will be placed in 55-gallon drums, sealed, labeled, and left on-site to await disposal pending results of the laboratory analyses. 3.4 LABORATORY ANALYSES General Railroad Use The soil samples collected from the ballast/native soil interface in the 18 borings at the site will be analyzed discretely for volatile organic compounds (VOCs) by EPA method 8260B and asbestos by Method 600/R-93/116. The six interface samples collected from each north-south line will be composited at a six-to-one (6:1) ratio by the laboratory. The three resulting composite soil samples will be analyzed for total petroleum hydrocarbons quantified as diesel (TPH-D), as kerosene (TPH-K), and as motor oil (TPH-MO) by EPA Method 8015m, semi- �.1� CONDOR