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ATTACHMENT B FIELD AND LABORATORY PROCEDURES Chevron Service Station 9-3232, 8660 Lower Sacramento Road, Stockton, California of known volume and measuring the water level response to derive values for transmissivity (T) and hydraulic conductivity(K) Values for T and K were solved using a Cooper et al (1967)1 solution in AQTESOLVIM software The hydraulic conductivity and transmissivity for each tested well, as determined from the analyses of the slug test data, are presented in Table 2 Appendix E contains the data plots and analyses for each test Laboratory Procedures for Soil Samples Soil samples collected were analyzed for the presence of TPHg and methanol by EPA Method 8015, BTEX, MtBE, DIPE, TAME, EtBE, TBA, EDB, 1,2-DCA, and ethanol by EPA Method 8260B Collected groundwater samples were analyzed for TPHg by EPA Method 8015, BTEX and MtBE by EPA Method 8021, and DIPE, TAME, EtBE, TBA, EDB, 1,2-DCA, ethanol, and MtBE by EPA Method 8260 Soil Cuttings and Rinsate Water Soil cuttings generated during drilling operations were temporarily stored onsite and covered with plastic sheeting pending characterization and disposal Chevron's disposal contractor removed soil cuttings to an appropriate disposal facility Water generated during steam cleaning was temporarily stored in DOT-approved 55-gallon drums pending transport by Chevron's disposal contractor to an appropriate disposal or treatment facility Organic Vapor Procedures Soil samples collected at five-foot intervals during drilling were analyzed in the field for ionizable organic compounds using a photo-ionization detector (PID) with a 10 2 eV lamp The test procedure involves measuring approximately 30 grams from an undisturbed soil sample, placing this sub-sample in a sealed container (either a zip-lock bag or a mason far) The container was warmed for approximately 20 minutes (in the sun), then the head-space within was tested for total organic vapor, measured in parts per million as benzene (ppmv, volume/volume) The instrument was calibrated prior to drilling using a 100-ppm isobutylene standard (in air) and a sensitivity factor of 55, which relates the photo-ionization potential of benzene to that of isobutylene at 100 ppm The results of the field-testing was noted on the boring logs PID readings are useful for indicating relative levels of contamination, but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory analyses Soil Sampling for Stockpiled Soil Soil samples were collected by advancing a 2-inch diameter stainless steel sample liner into the soil stockpile, after removing approximately 6-inches to 1-foot of surface material in the 1 Cooper,H H,Jr,J D Bredehoeft,and I S Papadopulos, Response of finite dlwmwter well to an instantaneous change of water, Water Resour Res,3,263-269, 1967 40