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SMITH ENVIRONMENTAL TE TEL : 1 - 209 - 579 - 2106 May 01l ' 7 8 : 46 No . 001 P . 03 <br /> 4 <br /> This task includes mobilization to the site, advancing five soil borings, collecting soil samples, and <br /> completing three of the borings as monitoring wells. <br /> Two borings will be advanced to depths of approximately 30 feet and three borings will be <br /> advanced to depths of 45 feet using a hollow stem auger equipped drill rig. Drilling will be <br /> conducted by a State-licensed (C57) drilling company. A field geologist will be present to log all <br /> drill cuttings and soil samples. Descriptions of soil types encountered and sample collection <br /> intervals will be recorded on boring/well logs. Soil samples will be collected at five foot intervals <br /> and up to two samples from each of the five borings will be submitted for laboratory analysis. <br /> Placement of Soil Borings <br /> During a conversation in August 1996 with Mary Meays of the PHS/EHD, she indicated that it <br /> had yet to be determined if residual soil contamination from the waste oil tank had been <br /> completely removed during the overexcavation on January 21 , 1988 . To determine if residual soil <br /> contamination from the waste oil tank exists, two soil borings, one placed in the location of the <br /> former waste oil tank and one placed near the southern edge of the overexcavation, will be <br /> advanced to approximately 30 feet. The remaining three soil borings will placed outside the <br /> overexcavation area. One boring will be located downgradient from the former tank locations <br /> approximately 10 feet away from the overexcavation. The two remaining borings will be located <br /> upgradient and downgradient from the former tank locations, approximately 45 feet away from <br /> the overexcavation. <br /> The three borings located outside the excavation area will be completed as groundwater <br /> monitoring wells. The monitoring wells will be constructed of 24nch inside diameter schedule 40 <br /> PVC well screen and casing. To protect the integrity of the wells, locking, water-tight well plugs <br /> will be installed on each well and a water-tight wellhead labeled "monitoring well" will be <br /> concreted over each well . The top of casing of the new wellheads will be surveyed to assess <br /> groundwater gradient and flow direction- All drill cuttings will be drummed and stored on-site <br /> pending laboratory results. Disposal of drill cuttings is not included in this proposal . If necessary <br /> based on analytical results, an estimated budget for disposal will be prepared under separate <br /> cover. <br /> Task 3; Soil Sample Analysis <br /> The selected soil samples will be sent using chain-of-custody record to a State-certified laboratory <br /> for analysis. All soil samples will be immediately placed in a cooler with ice and delivered under <br /> chain-o&custody documentation to a State-certified analytical laboratory. Samples from the two <br /> soil borings near the waste oil tank, four samples total, will be analyzed for total petroleum <br /> hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethylbenzene, xylenes (BTEX), oil and grease, total lead, polychlorinated biphenyls <br /> (PCBs), and volatile organics. Due to the low mobility of waste oil in soil, Smith Technology <br /> believes that analyzing the samples from the three soil borings located outside the overexcavation <br />