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' 22 August 2000 <br /> AGE-NC Project No 95-0144 <br /> Page 2 of 8 <br /> feet bsg for collection of a grab ground water sample The locations of the soil probe borings are <br /> illustrated in Figure 2 <br /> 2 1 1 Soil Sample Collection <br /> Discrete soil samples were collected at depths of 6, 10 and 15 feet(bsg) Soil samples were collected <br /> ' using a Geoprobe soil sampling assembly loaded with four pre-cleaned 1 125-inch by 6-inch brass <br /> sleeves Soil samples were preserved by covering both ends of the brass sleeve with Teflon sheets, <br /> r capping, and sealing with tape Each preserved sample sleeve was labeled with soil probe boring <br /> ' location, depth, time, date and sampler's initials <br /> Each preserved sample was logged on a chane-of-custody form, placed in a chilled container and <br /> ' transported to Curtis and Tompkins, Ltd , a California Department of Health Services (DHS)- <br /> certified laboratory Selected samples were analyzed for <br /> ' • Total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel(TPH-d) and motor ort <br /> (TPH-mo) by EPA Method 5030/8015M, <br /> ' • Benzene, toluene, ethylbenzene and xylene (BTEX) by EPA Method 8020, and <br /> • Total lead by EPA Method 6010B <br /> ' Samples collected from soil probe boring 15B-8 were also analyzed by Curtis and Tompkins, Ltd <br /> for volatile organic compounds including MTBE <br /> ' 2 1 2 Grab Ground Water Sample Collection <br /> A temporary, pre-cleaned, one-inch outside diameter, 0 01-inch slotted well screen was placed into <br /> soil boring 15B-8 to a depth of 20 feet bsg The ground water sample was extracted by lowering a <br /> " modified Teflon bailer Into the screen section of the temporary well After sample retrieval,the water , <br /> ' sampler was disassembled and cleaned The sample was collected in three laboratory-supplied,40-ml <br /> VOA vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative The labeled vials <br /> ' were placed in a chilled container under ice and transported under chain-of-custody to Curtis and <br /> " <br /> Tompkins, Ltd for analysis The grab ground water sample and QA/QC blanks were analyzed for <br /> • TPH-g, TPH-d and TPH-mo by EPA Method 5030/8015M, <br /> ' • BTEX compounds by EPA Method 8021B, <br /> • MTBE by EPA Method 8260B, and <br /> • Advanced GevEnvironmental,Inc <br />