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y'f d <br /> M, <br /> s <br /> Chevron U.S.A. - Page 7 <br /> Typical pumping rates of ground water extraction and treatment systems <br /> anticipated for the remediation of petroleum hydrocarbons at the subject property <br /> most likely will range between 10 to 20 gallons per minute. Therefore, the 4- <br /> inch diameter wells anticipated to be installed at the subject property during <br /> our proposed investigation will most likely perform satisfactorily if utilized <br /> for such systems, with such use being anticipated in the initial well designs. <br /> Please refer t, Plate 2 at the end of the text which illustrates proposed <br /> soil boring and well locations. <br /> r: 5.0 METHODOLOGY <br /> Drilling will be performed utilizing a truck mounted drill rig equipped with <br /> .' <br /> - flight hollow-stem auger. A flames & Moore geologist or engineer will be present <br /> during drilling to assist in obtaining relatively undisturbed samples of the <br /> I <br /> subsurface materials, to maintain a log of borings, to field screen samples with <br /> f� a device capable of detecting volatile organic hydrocarbons as a trace gas, and <br /> �a <br /> I,..., to make observations of the site conditions. <br /> tom. <br /> is <br /> proximate 5 foot intervals, commencing at an <br /> Subsoils will be sampled at ap <br /> u approximate depth of five feet below the existing grade. It is anticipated that <br /> the pilot soil boring for the furthest down-gradient well will be sampled in a <br /> continuous manner to more closely evaluate aquifer material. Samples will be <br /> obtained by means of a California Modified sampler lined with brass sleeves or <br /> rings. The sampler will be advanced by blows from a 140 pound hammer falling 30 <br /> inches. Upon retrieval, samples will be retained 'or chemical analysis, and will <br /> be capped with a plastic cap over a teflon seal, and taped at each end. The <br /> samples will be placed into a cooler chest under proper chain of custody protocol <br /> s:� h40( <br />