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AEGIS ENVIRONMENTAL, INC. <br /> STANDARD OPERATING PROCEDURE <br /> r- RE: Hop LOW-STEM AUGER MONITORING WELL INSTALLATION AND <br /> DEVELOPMENT <br /> SOP-6 <br /> �- B reholes for monitoring wells are drilled using a true mn�hes !ted a gear thanhollW-stenthe outs drel <br /> 0 <br /> rig. The borehole diameter will be a <br /> mf ll <br /> screen.o The hollow-Steprovides <br /> diameter of the casing when installing <br /> minimal interruption of drilling while permitting soil sampling at desired intervals. Soil <br /> samples are collected by <br /> either hammering or hydraulically pushing a conventional split- <br /> barrel sampler containing pre-cleaned 2-inch diameter brass tubes. A geologist or <br /> engineer from Aegis Environmental, Inc. continuously logs each borehole during drillingo <br /> 9s of both the <br /> and constantly checks drill cutting so�"sin indication <br /> a portable photoonizat onrst rdetector <br /> groundwater and volatile hydrocarbon9 between <br /> (Pl(]), flame ionization detector <br /> eared or washexped with all other driter. The lling equipmendt between <br /> samples and either steam <br /> -contamination. <br /> borings to minimize the potential for cross <br /> Monitoring wells are cased with threaded,factory-perforated and blank Schedule 40 PVC. <br /> Thwith 0.020-inch wide by 1.5- <br /> e erforated interval consists of slotted casing, ge�ereysecu ed to the bottom of the <br /> T P <br /> inch long slots,with 42 slots per foot. A PVC cap may <br /> casing with stainless steel screws; raelvents or c <br /> dist ibu on of filtermaterial and ements are used. rg o devices <br /> within <br /> may be fastened to the casing to assureis thoroughly hl washed and/or steam cleaned, or <br /> the borehole annulus• he well +pgor to installation. <br /> may be purchased as pre-cleaned, <br /> lter material is <br /> After setting the casing inside the hollow-stem aubgttor� no generally r gravellffoot a ove the <br /> poured into the annular space to fill from boring <br /> perforated interval. A r in into filter bentonite <br /> ck.`tEithlerr neat cement,coug is set above ntaining ng about5�f <br /> prevent grout from infiltrating into t ace fom the top <br /> bentonite, or sand-cement grout is then tremmied into the annular sp <br /> the bentonite plug to near surface. A ewa sr whale steel vault 5stoveld <br /> pipes" are usually s taround each we Ihover <br /> for wells located in parking lots or dr Y <br /> wellheads in landscaped areas. <br />