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maximum of 20 feet of screened section. Based upon P previous <br /> drilling at the site it is anticipated that slot sizes will be . 010 <br /> inch with appropriately sized filter pack. <br /> installed, developed, These wells will be <br /> attached QA/QC Plan. purged and sampled in accordance with the <br /> Soil samples will be collected at f ' <br /> well boring for logging <br /> r <br /> in five foot intervals from each <br /> field geologist us ng the ASTM Standard Practice for Descamples will be deribed p the <br /> and Identification of soils (D-2488-90) . Description <br /> For the two borings along the eastern side of the <br /> 1) a total of 8 soil samples will be submittedfromteach yell <br /> boring for laboratory analysis. These samples will be selected by <br /> the site geologist based on field observations including, PID <br /> response, discoloration or odors, and lithology. If a new well is <br /> drilled in the northwest corner of thero ert <br /> only soil samples from below 60 feet (previously rsampledeplacgdepth) <br /> I <br /> will be submitted for analysis. One sample per ten foot of <br /> drilled section will be submitted from this boring. <br /> E All soil samples will be analyzed for Total Petroleum Hydrocarbons <br /> as gas and diesel (TPHG&D) and Benzene, Toluene, Ethylbenzene and <br /> Xylenes (BTEX) . The water samples from the three wells will also <br /> be sampled for TPHG&D and BTEX, as well as Chlorinated <br /> Hydrocarbons. A sample from one of the wells will be submitted for <br /> a general mineral analysis to establish the inorganic quality of <br /> the first water bearing zone. Laboratory analysis will performed <br /> by Sequoia Analytical (DOHS #1210) <br /> protocols. utilizing standard EPA <br /> All wellheads (including wells from earlier investigations) will be <br /> surveyed to a common datum and wells with standing water will be <br /> monitored to establish hydraulic gradient. Monitoring will be <br /> conducted at several times over a 24 hour period to assess any <br /> 4 <br /> short term temporal variation. <br /> All residual material (water and soil) <br /> investigation will be stored on site and addressedeal ng withthis the <br /> existing stockpiled materials from earlier investigations for which <br /> a remedial plan has already been approved. <br /> 3 . Although it is anticipated that excavation will be the only <br /> feasible approach for remediating the impacted soils identified in <br /> the northwest corner of the site a formal feasibility evaluation <br /> will be performed. This is intended primarily to identify any <br /> problems with excavation in that area (utilities, need for shoring) <br /> as well as to estimate costs relative to other approaches. It is <br /> likely that the only other feasible approaches for the impacted <br /> soil identified to date is vapor extraction or capping. <br /> � <br /> Additionallyet <br /> , <br /> soilysample results may affect z the remedialtoption.complete <br />