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ATTACHMENT C <br /> FIELD PROCEDURES <br /> Chevron Service Station 9-1452, 334 East Main Street, Ripon, California <br /> A Laboratory Procedures for Soil Samples <br /> Soil samples collected were analyzed for the presence of total petroleum hydrocarbons <br /> quantified as gasoline (TPHg), by Northern California Leaking Underground Fuel Tank <br /> (LUFT) method, methanol and ethanol by EPA Method 8015B (modified), benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) and the fuel oxygenates methyl tertiary butyl ether <br /> (MtBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), ethyl tertiary butyl <br /> ether (EtBE), tertiary butyl alcohol (TBA), 1,2-Dibromo ethane (EDB), and 1,2 <br /> dichloroethane (1,2-DCA)by EPA Method 8260B. <br /> Slug Testing <br /> The slug test consists of quickly raising (slug insertion) or lowering (slug removal) the water <br /> level in a well from equilibrium and measuring the subsequent rate of rise or fall, <br /> respectively. Slug insertion and slug removal tests were performed on each well using a slug <br /> of known volume and measuring the water level response to derive values for transmissivity <br /> (T) and hydraulic conductivity(K). <br /> Values for T and K were solved using a Bouwer and Rice. (1976), solution in AQTESOLVTM <br /> software. The hydraulic conductivity and transmissivity for each tested well, as determined <br /> from the analyses of the slug test data, are presented in Table 2. Appendix E contains the <br /> data plots and analyses for each test. <br /> Soil Cuttings and Rinsate Water <br /> Soil cuttings generated during drilling operations were temporarily stored onsite and covered <br /> with plastic sheeting pending characterization and disposal. Chevron's disposal contractor <br /> removed soil cuttings to an appropriate disposal facility. Water generated during steam <br /> cleaning was temporarily stored in DOT-approved 55-gallon drums pending transport by <br /> Chevron's disposal contractor to an appropriate disposal or treatment facility. <br /> Soil cuttings and rinsate water drums were temporarily stored onsite for approximately 4 to 8 <br /> weeks. <br /> Organic Vapor Procedures <br /> Soil samples collected continuously during drilling were analyzed in the field for ionizable <br /> organic compounds using a photo-ionization detector (PID) with a 10.2 eV lamp or a flame <br /> ionization detector (FID). The test procedure involved measuring approximately 30 grams <br /> from an undisturbed soil sample, placing this sub-sample in a sealed container (either a zip- <br /> lock bag or a mason jar). The container was warmed for approximately 20 minutes (in the <br /> Bouwer,H.,and R.C.Rice,A Slug Test for Determining Hydraulic Conductivity of Unconfined Aquifers <br /> With Completely or Partially Penetrating Wells, Water Resources Research, 12(3),423-428, 1976. <br />