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r, N%''' %Now, <br /> When the sampler was advanced, O-ring seals and an expendable drive point provided a <br /> watertight system to ensure sample integrity. <br /> When the tool was advanced to the desired depth, extension rods were sent downhole to brace <br /> the bottom of the sample screen as the tool casing was retracted. When the casing was retracted, <br /> .� approximately 41-inches of screen with slot sizes of 0.004 inches was exposed. Teflon tubing <br /> with a check valve attached to one end was inserted down the casing until it was immersed in <br /> groundwater. Water was then pumped through the tubing and to the ground surface by <br /> oscillating the tubing up and down. Groundwater samples were placed on ice and delivered under <br /> chain-of-custody documentation to State-certified AEN laboratory for chemical analysis. <br /> �.. Following soil and groundwater sample collection, the borings were backfilled with neat cement <br /> grout to the ground surface. <br /> Groundwater samples were analyzed by AEN for TPHg, BTEX, oxygenate fuel additives, and <br /> total lead. The analytical results for soil samples are summarized in Table 2. Laboratory data <br /> sheets and chain-of-custody documentation are included in Appendix D. <br /> 2_2 Phase Two <br /> V <br /> The scope of work completed in phase two included obtaining permits, advancing two soil <br /> borings using hollow stem auger, soil sampling and analysis, completing one of the borings as a <br /> groundwater monitoring well, developing the groundwater monitoring well, and groundwater <br /> sampling and analysis. <br /> 2.2.1 Drilling Activities <br /> On November 12, 1997, a Smith Technology geologist supervised the advancement of one soil <br /> boring to 35 feet bgs and one boring to 9 feet bgs. A site plan showing soil boring locations is <br /> included as Figure 2. Drilling was conducted by Mitchell Drilling (State C57 license no. 672617) <br /> utilizing a hollow stem auger drill rig. A field geologist logged all drill cuttings and cored soil <br /> samples utilizing the Unified Soil Classification System. Cored soil samples were collected at <br /> five-foot intervals using a 2-inch diameter split-spoon sampler containing three brass tubes. The <br /> cored samples and drill cuttings were characterized for soil type, moisture content, and visual <br /> evidence of petroleum contamination. Descriptions of soil types encountered and sample <br /> collection intervals are presented on the boring logs contained in Appendix E. <br /> 2.2.2 Soil Sampling and Analysis <br /> �1 <br /> Each soil sample was field screened with a Photoionization Detector (PID) for the presence of <br /> volatile organic compounds. No petroleum hydrocarbons were observed during field activities in <br /> borings MW1 and MM2. No PID readings from the collected soil samples exceeded background <br /> w:\90954\90954.03\repM\psi.doc 3 <br /> SMTH <br />