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Fuller Mobile Home Park . <br /> 3651« Louise Ave-, Lathrop, California December 20, 1993 <br /> Phase HSite Characterization Page. 2 <br />' 3.1 Drilling <br />' Permits were obtained as necessary for all wells before drilling began The soil bonngs <br /> were accomplished using a mobile mounted drilling ng employing the use of a hollow <br /> stem flight auger of 6 112" 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 prevent cross <br />' contamination <br /> The bonngs were logged under the direct supervision of a registered professional using <br /> the Unified Soil Classification System (Appendix F) The color, texture, moisture, <br /> plasticity (if applicable), consistency of the earth materials, pertinent soil or bedrock <br /> characteristics and any evidence of contamination were noted All water bearing zones <br />' and the depths at which they were encountered were also noted on these logs <br /> All borings were drilled in such a manner as to prevent cross contamination between <br /> strata Exploratory soil bonngs within the unsaturated zone were backfilled with a <br /> cement and three percent(3%)Bento:ute mixture <br /> Upon termination, the bonngs into the saturated zone were completed as monitoring <br /> wells and backfilled with concrete grout, after a Bentonite seal had been placed <br /> (Appendix C) The bonngs for the monitoring wells were of a diameter at least 4 <br />' inches greater than the 2 inch diameter of the well casing to be used <br /> The -uttmgs from the drilling operation were containerized on-site during drilling for <br />' proper disposition The proper method of disposal will be dependent upon results of <br /> laboratory analysis This disposal is the responsibility of the client unless other <br /> arrangements have been made <br />' 3.2 Well Construction <br /> All materials used in well construction were thoroughly cleaned prior to introduction <br />' into the boring A Bentonite or cement and Bentonite grout was placed at the bottom <br /> of the borings as necessary After the seal has been allowed to set long enough to <br /> support the weight of the casing, a 2- inch diameter PVC well casing with end cap and <br />' factory perforations for placement in the saturated zone (taking into account seasonal <br /> variation) was placed in the boring The screen and filter pack sizes were as noted in <br /> the well completion logs The casing and end caps were threaded or joined by stainless <br /> steel screws, no PVC cement was used The filter pack extended two feet above the <br /> perforated zone A Bentonite seal two to three feet thick was placed in the annular <br /> space above the filter pack followed by a cement grout to the surface <br /> 1 <br />