Laserfiche WebLink
' Manteca Unified School District <br /> Soil&Groundwater Investigation eport <br /> Page 4 <br /> • <br /> 2.1 Drilling <br /> Permits were obtained as necessary for all wells (including borings) before <br /> drilling began The soil boring was accomplished using a mobile mounted <br /> drilling ng employing the use of a hollow stem flight auger no less than 3 1/4- <br /> inchid and 87/8od <br /> ' All drilling equipment was thoroughly steam-cleaned before drilling began, to <br /> prevent the introduction of contamination from off site, and between borings to <br /> ' prevent cross contamination <br /> The borings were logged under the direct supervision of a registered professional <br /> i ' using the Unified Soil Classification System The color, texture, moisture, <br /> plasticity (if applicable), consistency of the earth materials, pertinent soil or <br /> bedrock characteristics, and any evidence of contamination will be noted All <br /> ' water-bearing zones and the depths at which they were encountered are noted on <br /> these logs <br /> ' All borings were drilled in such a manner as to prevent cross contamination <br /> between strata Exploratory soil borings within the unsaturated zone were <br /> ie backfilled with Bentonite and cement <br />' ' Upon termination, the boring into the saturated zone was completed as a <br /> monitoring well and backfilled with concrete grout, after a Bentonite seal has <br /> ' been placed The boring for the monitoring well was of a diameter at least 4 <br /> inches greater than the 2-inch diameter of the well casing to be used <br /> ' The cuttings from the drilling operation were containerized on-site during drilling <br /> for proper disposition The proper method of disposal will be dependent upon <br /> ' results of laboratory analysis This disposal will be the responsibility of the client <br /> unless other arrangements are made <br /> ' 2.2 Well Construction <br /> ' All materials used in well construction were thoroughly cleaned prior to <br /> introduction into the boring A Bentonite or cement and Bentonite grout was <br /> placed at the bottom of the boring as necessary After the seal had been allowed <br /> ' to set long enough to support the weight of the casing, a 2- inch diameter well <br /> casing (PVC) with end cap and factory perforations for placement in the saturated <br /> zone (taking into account seasonal variation) was placed in the boring The <br /> screen and filter pack sizes were as noted in the well construction drawing (see <br /> boring log) The casing and end caps were threaded, no PVC cement was used <br /> The filter pack extends two feet above the perforated zone A Bentonite seal 2- to <br />