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i <br /> Canepa's Car Wash <br /> 248 E Park Street, Stockton, California <br /> aka: 642 N. Hunter Street <br /> Phase II Site Characterization and July 2, 1994 <br /> Quarterly Groundwater Report (May 1994) Page: 3 <br /> 3.1 Drilling <br /> Permits were obtained before drilling began The borings were accomplished using <br /> a mobile mounted drilling ng employing the use of hollow stem flight augers The <br /> borings were drilled with 6 3/4" o d augers, and the monitoring wells were drilled <br /> with either 8 or 9" augers All drilling equipment was thoroughly steam-cleaned <br /> before drilling began, to prevent the introduction of contammatnon from off-site, <br /> and between borings to prevent cross-contamination <br /> The bonngs were logged under the direct supervision of a registered professional <br /> using the Unified Soil Classification System (Appendix E) The color, texture, <br /> moisture, plasticity, consistency of the earth materials, pertinent soil or bedrock <br /> characteristics, and any evidence of contamination were noted All water-beanng <br /> zones and the depths at which they were encountered were noted on these logs <br /> (Appendix C) <br /> All bonngs were drilled in such a manner as to prevent cross contamination <br /> between strata Exploratory soil borings were backfilled with a neat <br /> cement/bentomte grout mixture to the original grade <br /> The cuttings from the drilling operation and steam-cleaning were contamenzed on- <br /> site for proper disposition The proper method of disposal will be dependent upon <br /> the results of laboratory analyses This disposal will be the responsibility of the <br /> client unless other arrangements have been made <br /> 3.2 Well Construction <br /> All materials used in well construction were thoroughly cleaned prior to <br /> introduction into the boring A bentonite or cement/bentonite grout seal was <br /> placed at the bottom of the bonngs as necessary After the seal was allowed to set <br /> long enough to support the weight of the casing, a 2-inch diameter PVC well <br /> casing with end cap and factory perforations for placement in the saturated zone <br /> (taking into account seasonal variation) was placed in the boring The screen and <br />' filter pack sizes are noted on the Bonng/Well Completion Logs The casing and <br /> end caps were threaded or joined by stainless steel screws, no PVC cement was <br /> used The filter pack extends two feet above the perforated zone A bentonite <br />' seal two to three feet thick was placed in the annular space above the filter pack <br /> followed by a cement/bentorite grout to the surface <br /> 1 <br />