Laserfiche WebLink
16 <br /> is just southwest of the mud ponds, but may not be downgradient . <br /> Of these wells, only Well No. 4 and the Stock Well are probably <br /> shallow enough to serve as effective monitor wells. This is <br /> because the other wells are not perforated above the shallow clay <br /> which is normally present in the 70 to 100 foot depth interval . The <br /> strata most likely to be influenced by waste disposal activities at <br /> the facility are less than 70 feet deep. <br /> Five new monitor wells are proposed as part of a new moni- <br /> toring program (Figure 1 ) . One of these wells would be immediately <br /> downgradient (northwest) of the lime ponds. A second monitor well <br /> would be immediately downgradient (northwest) of the mud ponds . <br /> Two additional monitor wells would be drilled immediately down- <br /> gradient of the main wastewater ponds . A fifth monitor well would <br /> be drilled southeast of the main wastewater ponds, to serve as an <br /> upgradient monitor well. <br /> These monitor wells would all be drilled by the mud rotary <br /> method. Drill cuttings' would be logged by a geologist under the <br /> supervision of, R.D. Schmidt, a Registered Geologist in California. <br /> Shallow monitor wells would extend to a depth near the top of the <br /> shallow clay stratum (about 65 feet) , and perforated casing <br /> installed from about 20 feet in depth to the bottom of the well. A <br /> 12-inch diameter hole would be drilled and 6-inch diameter Schedule <br /> 80 PVC casing installed. The casing joints would be screwed <br /> together. The well would be gravel packed up to a depth about five <br /> feet above the top of the perforations. A pressure grouted cement <br /> seal would then be placed from the top of the gravel to the land <br /> surface. The wells would be developed by air-lifting for about two <br />