Laserfiche WebLink
;Sanzplir�q Protocols <br /> Drilling <br /> Permits were obtained for the. borings and .Monitoring wells before the di-lling began. <br /> The soil borings were accomplished usin,g.a mobile mounted drillingrig g em ploying the <br /> use of a hollow stem flight auger ro less than 3-3%4 inch I.A. and 8-714 inch o.d. <br /> All drilling equipment_was thoroughly steam cleaned before drilling began to prevent <br /> the introduction' of contamination from off site, and between borings to preveIlt cross <br /> contamination. <br /> The borings were logged under the direct supervision of a registered geologist, using <br /> the Unified Soil Classification System. The color, texture, moisture, plasticity (if <br /> applicable), consistency of thz earth material-., blow counts, pertinent soil or bedrock <br /> characteristics, and any evidence of contamination viere noted. All water-bearing zones <br /> and the depths at which they were encounlered were noted on these logs. <br /> M.l borings were drilled in such a manner as to prevent cross contamination between j <br /> strata. Exploratory soil borings within tl.e unsaturated zone were backfilled with a. five <br /> percent (5%) Bentonitc and cement grout with a Bentonite plug at the base. <br /> The cuttings from the drilling operation were containerized on site during drilling for <br /> proper disposition, The proper method of.disposal is dependent upon results of labora- <br /> tory analysis; this disposal is the responsibility of the client unless other arrangements <br />� have been math:. <br /> Well Construction <br /> All materials used in well construction were thoroughly cleaned prior to introduction <br /> into the boring. A Bentonite grout was placed at the bottom of the boring as necessary. <br /> After the seal had-been allowed.to set long enough to support the weight of the casing, <br /> a two inch (2") diameter well casing (PVC) with.end cap andfactory perforations for. <br /> placement in the saturated zone (taking into account seasonal variation) was placed in <br /> the boring. The screen and filter pack sizes-are as rioted in the well construction draw= <br /> ing. The casing and end caps were breaded`; no.PVC cement was used. The filter pack <br /> extends 4-112' above the perforated zone. A Bentonite seal two to six feet (6') thick <br /> was placed in the annular space above the filter pack followedby a,cement grout to the <br /> surface. Seal and filter pack elevations may vary based on the underlying geology. <br /> r , . <br /> F } rc <br />