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evioko � Lf) t'l <br />Hyl <br />Mr. Alan Biedermann <br />San Joaquin County <br />Environmental Health Department <br />P.O. Box 2009 <br />Stockton, CA 95201 <br />Subject: Monitoring Well Installation <br />Foothill Landfill <br />Waverly Road <br />San Joaquin County, California <br />Dear Mr. Biedermann: <br />i <br />Hydro -Search, Inc. <br />333 Flint St. • Reno, Nevada 89501 <br />HYDROLOGISTS -GEOLOGISTS -ENGINEERS <br />Phone (702) 322-4173 <br />April 12, 1988 <br />(7751-88) <br />Hydro -Search, Inc. (HSI) proposes to install four monitoring wells at the <br />Foothill Landfill as part of an environmental assessment for a land <br />transfer of the property. The proposed locations are shown on Figure 1. <br />The wells will be constructed as shown on Figure 2. <br />Hunt Drilling of Jackson, California will be drilling the wells using a <br />CME air -rotary drilling rig. The drilling bit and rig will be steam <br />cleaned between holes. The air used to lift the cuttings will be filtered <br />to remove all organics introduced by the compressor on the drill rig. <br />Six-inch diameter holes will be drilled and one -inch schedule 80 PVC <br />casing and screen will be installed. We estimate a maximum of 10 feet of <br />screen will be placed in each well. Filter pack consisting of #4 Monterey <br />sand will be placed to a height of 2 feet above the top of screen. A one <br />to three foot thick bentonite seal will then be placed over the filter <br />pack using Volclay pellets followed by a cement/bentonite grout to land <br />surface. An locking anodized aluminum protective casing will be <br />installed. <br />The wells will be developed by air lifting and surging. Samples will be <br />obtained using a PVC bailer. The bailer will be steam cleaned between <br />holes. Approximately three casing volumes will be evacuated prior to <br />sampling. Specific conductance, pH, and ground -water temperature will be <br />monitored before and during well evacuation. Water samples will be placed <br />in sample bottles with teflon septa and transported on ice under chain - <br />of -custody to a California certified laboratory. Samples will be <br />analyzed for total dissolved solids, specific conductance, pH and <br />purgeable halocarbons (EPA 601). <br />Reno Denver Milwaukee <br />