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w� completed at a depth of approximately 55 feet below grade or within an impermeable horizon, if encountered. The wells will be constructed of 2 inch diameter PVC screen/casing and completed as shown on Figure 4. Screen slot size will be 0.010" . Filter pack will consist of #2 sand. 2, ) Drilling will be conducted by Spectrum Exploration, c. (C57-512268) using a hollow stem drill rig. A field geologist will be present to continuously log all drill cuttings and soil samples utilizing the Unified Soil Classification sample colPen- en- dix II) . Descriptions of soil types encountered, tion intervals, and well completion details will be recorded On well/boring logs and included within the assessment report. Cored soil samples will be collected above the water table at five foot intervals in accordance with Waterllork's Soil Sampund- ling Protocol (Appendix II ) . Samples collected from the soil/gro d for laboratory analysis. water interface will be submitte Analysis will be conducted for benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as diesel {TPHD) by Applied Analytical Laboratories (DOHS Cert. #1211) . Analyti- cal methods, sample containers, holding times and means of pres- ervation are lis--;ed in Appendix II. 3 . ) All drill cuttings will be placed on a paved surface, covered with plastic sheeting, and remain on-site pending labo- ratory results. Thereafter, a proposal for treatment or disposal of the excavated material will be prepared. To avoid cross- contamination, drilling augers will be steam cleaned before used to clean the augers after drilling each borehole. Waterdrilli will stored in drums provednfor hazardous each liquid storage e collected d storage pendinglabora laboratory analysis 4, ) Following completion of the monitoring well, it will be developed and monitored in accordance with WaterWoruentGtouin- water Monitorir►g Protocol (Appendix II) , stallation, a water sample will be collected from the wells after purging a minimum of four well volumes (casing and sand pack) . The purged water will remain on-site A p p proposal forseced 55 on drums, ied• treatment until laboratory results are receve ared. and /or disposal of the produced water will then be prepared. ation will be in accordance Water sample collection and presery with WaterWork' s Groundwater Sampling Protocol (Appendix II) . The water sample will be analyzed for TPHD and BTEX by a DHS certified laboratory utilizing appropriate EPA and DHS methodolo- gies. 5 . ) All site activities involving potential contact with hazardousminated soils) l be conducted materials accorda th W terWork'stHealth and Safety a inc w Plan (Appendix III). 6. ) A Problem Assessment report will be prepared according to Regional Board guidelines summarizing the findings of the inves- tigation and recommending remedial action alternatives, as appro- priate. The field investigation will be conducted under the 4