ARCHIVED REPORTS XR0010930 - Laserfiche WebLink

Home Browse Search

a.. McDowell &Davis Towing Phase II Groundwater Monitoring Well Installation Report "- The wells were surveyed for elevation so that a gradient can be determined: Groundwater Elevations sw Well Collar Elevation DTW GW Elevation MW-1 116.98 61.37 55.61 MW-2 117.5 61.99 55.51 MW-3 117.28 61.59 55.69 2.1 Drilling Permits were obtained as necessary for all wells (including borings) before drilling began. The soil boring was accomplished using a mobile mounted drilling rig employing the use of a hollow stem flight auger no less than 3 1/4- inch i.d. and 8 718 o.d. &. All drilling equipment was thoroughly steam-cleaned before drilling began, to prevent the introduction of contamination from off site, and between borings to y prevent cross contamination. The borings were logged under the direct supervision of a registered professional using the Unified Soil Classification System. The color, texture, moisture, plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock characteristics, and any evidence of contamination will be noted. All water-bearing zones and the depths at which they were encountered are noted on these logs. ;. All borings were drilled in such a manner as to prevent cross contamination between strata. Exploratory soil borings within the unsaturated zone were backfilled with Bentonite and cement. w. Upon termination, the boring into the saturated zone was completed as a monitoring well and backfilled with cement grout, after a 3' Bentonite seal has *� been placed. The boring for the monitoring well was of a diameter at least 4 inches greater than the 2-inch diameter of the well casing to be used. +r The cuttings from the drilling operation were containerized on-site during drilling for proper disposition. The proper method of disposal will be dependent upon results of laboratory analysis. This disposal will be the responsibility of the client unless other arrangements are made. 2.2 Well Construction All materials used in well construction were thoroughly cleaned prior to introduction into the boring. A cement and Bentonite grout was placed at the '"' bottom of the boring as necessary. After the seal had been allowed to set long enough to support the weight of the casing, a 2- inch diameter well casing (PVC) with end cap and factory perforations for placement in the saturated was placed in the boring. The casing and end caps were threaded, no PVC cement was used. 4