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30 October 1998 <br /> AGE Project No. 95-0118 <br /> i r Page 2 of 6 <br /> in Pacheco, California. Each sample was analyzed in accordance with the following: <br /> • EPA Method 8015m for total petroleum hydrocarbons quantified as gasoline (TPH-g), <br /> ` EPA Method 8020 for volatile aromatics (benzene toluene ethyl benzene and xylenes: <br /> BTEX), methyl tertiary butyl ether(MTBE) and <br /> • EPA Method 8260(m) and EPA method 8260 for di-isopropyl ether (DIPS), ethyl tertiary <br /> butyl ether(ETBE),methyl tertiary butyl ether(MTBE),tertiary amyl methyl ether(TAME) <br /> and tertiary butyl alcohol (TBA) and other volatile organic compounds (VOCs). <br /> <a 2.3. DRILLING AND SAMPLING <br /> On 30 and 31 July 1998, six borings were drilled at the site. Two soil borings(V W3 and V W4)were <br /> drilled vertically to a depth of 35 feet below surface grade (bsg) and one soil boring (VW5) was <br /> established at a 30° angle from vertical, with a total run length of 35 feet. Three additional soil <br /> borings (IAS3,IAS4 and IAS5)were vertically established to a depth of 44 feet bsg. The locations <br /> of the borings are shown on Figure 2. Each boring was drilled using a truck-mounted CME 75-HT <br /> drill rig. The drill rig and two-man crew were supplied by Mitchell Drilling Environmental (MDE) <br /> of Rancho Cordova, California. <br /> -_a <br /> Samples were collected at five-foot intervals in each boring beginning at varying depth using a split <br /> -_ tube sampler loaded with three clean, 2 by 6-inch brass sleeves. A 140-pound hammer was used to <br /> advance the sampler 18 inches; the number of blows required to advance the sampler in 6-inch <br /> increments was recorded on the boring logs. All sampling equipment was washed in an Alconox <br /> solution and rinsed twice with water prior to each sampling run. <br /> For each sample, both ends of the lead sleeve were covered with Teflon sheets, capped and sealed <br /> with tape. The samples were then labeled, stored on ice and transported under chain-of-custody to <br /> MAI. <br /> 2.4. LOGGING <br /> l During drilling,.auger returns and duplicate soil samples were monitored for the presence of organic <br /> soil-vapor using an organic vapor meter (OVM) equipped with a photo-ionization detector (PID: <br /> Thermo Environmental 580A, 10.0 eV, calibrated to isobutylene). Auger returns were then placed <br /> on plastic sheeting and stored on-site. The soil was then described in accordance with the Unified <br /> Advanced GeoEnvironmental,Inc. <br /> r <br />