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-emu- <br /> N , <br /> 3 <br />� ��ti~ �. � !�!� K' #a��m. � � �M_w !"•'k„ + �; b,�� s _�- �� � .ter ,� _ �;", <br /> T <br /> . GASCO Oil Company December 11, 1990 <br /> Quote No. 8115G(Revised) <br /> Page 2-2 <br /> k <br /> wells with approximately 35 feet of screen. The long screen interval is due to large <br /> fluctuaticns in groundwater elevatio,i. Exceltech will obtain prior authorization for the <br /> soil borings, monitoring wells, and long screen interval from the San Joaquin County <br /> Health Services Environmental Health Division. <br /> EU_I9rAWa_Daring <br /> ExceItech will drill four exploratory borings and convert them, when completed, to <br /> groundwater monitoring wells. The borings will be drilled with a truck-mounted drill <br /> rig using continuous-flight, hollow-stem auger measuring 10-inch outside diameter and <br /> 6-5,8-inch inside diameter. The auger and other tools used in the borehole will be <br /> steam-cleaned before use. Soil samples will be collected at 5-foot depth intervals <br /> beginning at 15 feet with a California modified split-spoon sampler with internal brass <br /> liners. Soil collected during drilling will be placed in properly labeled drums and left <br /> on-site until laboratory resillts are completed. The client is responsible for the disposal <br /> of aII drummed soil. Exceltech can assist for an additional fee based on time and <br /> mater11 als. <br /> A,, the boring is advanced to-the desired sampling depth, the sampler will be lowered ed to <br /> the bottom of the hole. The sampler will.be driven by a 140-pound, rig-operated <br /> hammer 18 inches into the relatively undisturbed soil below the auger. The sampler <br /> will then be removed from the hole and disassembled. The Exceltech geologist will <br /> field-test one sample with a portable gas vapor photoionization detector for vo?atile <br /> hydrocarbons. The geologist-will-also prepare a log of the subsurface conditions <br /> encountered during drilling based-on observations of tite samples, The geologist wii. <br /> classify the soil usi,ig the Unified Soil Classification System and Munsell Soil Color <br /> Charts. <br /> Soil from one of the brass liners will be designated as a possible laboratory sample and <br /> retained in a chilled ice chest. An Exceltech geologist will collect the remainir,-g soil <br /> samples and field-test each sample for total volatile hydrocarbons with a portable <br /> photoionisation detector. Based on this field test, fouv samples from each boring will <br /> be selectee: for laboratory analysis. All s=imple;, selected for Iabaratory analysis will be . <br /> capped, lr,neled, logged on a chain-of-custody form, and placed in a chilled ice chest for <br /> 1 transport to a state-certified laboratory. The Exceltech geologist will prepare a log of <br /> subsurface.conditions encountered during drilling. <br /> 1 Gr ndwater Monitoring Well Const ,rrir�r� <br /> Groundwater monitoring wells will be constructed in each of the exploratory boring;, <br /> as shown in Figure 1. The wells will be constructed according to San Joaquin County <br /> Health Services specifications. Although Exceltech is planning to construct the wc,ls <br />