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r <br /> 7 <br /> 1 v�' <br /> Ms. Eleanor Ratliff <br /> March 29, 1991 <br /> page 2 <br /> To avoid exposing an open excavation during the rainy season, <br /> soils will be excavated in the spring when alnathenir4iexcOmta�the <br /> nated soils can be completed efficiently. Plastic he <br /> former tank pit location has been covered with 6-mil p <br /> to <br /> prevent leaching of contaminants. <br /> The analytical results from the most resent sampling of -'.-he <br /> site's groundwater monitoring wells (Table 1) indicate the dis- <br /> solved hydrocarbon contaminant plume roundwatcr contaminant plume, <br /> defined. To fully define the g <br /> WaterWork proposes the installation of three additionalmonitor- <br /> ing wells. The proposed monitoring wells will be placed <br /> on Figure 1 to attempt to define a zero--line of the dissolved <br /> hydrocarbon contamination. <br /> Drilling will be conducted by Exeltech Drilling (C57-596545 ) <br /> using a hollow stem drill rig. An experienced field geologist <br /> will be present to continuously log all drill cuttings and soil <br /> De- <br /> samples �,tilizing the Unified Soil Clasam£leacollection ir►ter- <br /> scrip <br /> tions of soil types encountered, p <br /> vats, boring abandonment, and well Coxed soil 1 construcsamplestion twill belcol- <br /> recorded on well/boring logs. <br /> lected above the water table at five foot intervals and below the <br /> ,,later table at select intervals in accordance edhsoilesamples <br /> Soil Sampling protocol (Attachment I) . <br /> Selection far ample- <br /> ! will be submitted for laboratoryanalysis. <br /> be based upon field evidence of contamination <br /> tory analysis will <br /> (PID readings, discoloration, odors) and site stratigxaphid <br /> s will. be conduct <br /> changes. Analysied for STEX and TPHG by Applied <br /> ert. 1211). Analytical methods, sample contain- <br /> Analytical (DHS cnd means of preservation are listed in <br /> ers, holding times, a <br /> Attachment I. <br /> All drill cuttings will be placed on plastic sheeting, covered <br /> with same, and remain on-site pending laboratory results. All <br /> soils generated during drilling activities <br /> will in e aerated <br /> eletter.s dalong <br /> with excavated soils, as described p <br /> avoid cross-contamination, drilling augers will be steam-cleaned <br /> before drilling eacli borehole. Water used to clean the augers <br /> iill be collected and n <br /> after ri loin haea h bordous ing <br /> I d storage pend ng laboratory analys <br /> ape <br /> sis. <br /> ll�15111 Ila, x <br />