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FINAL • DDRWharpe Well Installation Work Plan observation piezometers and monitoring wells • Depth interval of filter pack; will be protected at the surface by a 10-inch diameter steel pipe with locking cover. The • Filter pack description; protective steel pipe will extend to a height of . Depth interval of well screen; 36 inches above the ground surface and will be set in a 4-foot square, 4-inch thick concrete pad • Well screen description (including material, that slopes away from the steel pipe.A bronze slot type, and slot size); survey marker with a 2-inch diameter domed cap will be set in the concrete pad.The wellhead • Location of centralizers; will be protected by four steel posts,7 feet long and 4 inches in diameter,that extend 4 feet • Location and description of drawdoA n tube; above the ground surface.The posts will be placed around the wellhead and embedded in Well development method; concrete-filled postholes.The protective casings . Well development data; and posts will be painted with bright yellow permanent paint. • Generalized surface completion; 4.7 Well Construction Diagrams • Reference elevation for all depth measurements; During the construction of each monitoring well and piezometer, an as-built diagram of the well • Name of driller; and will be recorded by the field geologist. . Name and signature of the field geolc gist Information provided in the as-built well preparing the well construction diag diagrams will include the following: • Project and site names; 5.0 POST MONITORING WELL INSTALLATION ACTIVITIES • Well number and dates constructed; 5.1 Monitoring Well Develo ent • Location of the monitoring well; Each well will be developed after well ca ing • Type of drill rig; installation.Well development procedurewill • Size and type of drilling method; follow those outlined in the Comprehenst le Field Work Plan. Wells will be bailed wii h a • Nominal boring diameter; sand-pump bailer(bailer containing a phr iger device that draws sediment into the bailei and a • Location and thickness of each stratum and flap that traps the material as the bailer is a brief description of each stratum; withdrawn)to remove fine sand inside the well casing; bailing will continue until fine gr ' ed • Depth of the static water level during sediment removed from the well decreases to drilling—upon completion of well less than an estimated one teaspoon of sediment construction, and before and after well in one bailer load.The well will then be s irged development(including the date and time of for at least 30 minutes or until the amouni of the water level measurements); sediment entering the well decreases to a evel • Total depth of completed well; deemed acceptable to the field geologist. hrell development data recorded will include Id • Depth intervals of well seals and grouts; determinations of pH, temperature, specific conductivity, turbidity data, the total num Der of • Seal and grout descriptions; well volumes purged from the well durin S-SSWP.DOC 8 Septe bei 1996