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F. ONCE THE SLOTTED AND BLANK PIPE HAS BEEN SET IN THE HOLE, BACKFILL WITH A FILTER <br /> PACK OF POROUS MATERIAL SUCH AS PEA GRAVEL. THE FILTER PACK SHOULD BE FILLED <br /> AROUND THE PIPE TO AT LEAST 2 FEET ABOVE THE TOP OF THE SLOTTED SECTION. DO NOT <br /> BACKFILL AROUND THE SLOTTED PIPE WITH CLAY OR OTHER MATERIAL WHICH WOULD IMPEDE <br /> GROUNDWATER FLOW INTO THE OBSERVATION WELL. <br /> G. ABOVE THE FILTER PACK,BACKFILL WITH CLEAN,DRILLED SOIL MATERIAL TO APPROXIMATELY <br /> 2 TO 3 FEET BELOW GRADE, AND TOP THE BACKFILL WITH A SURFACE SEAL OF CEMENT GROUT <br /> OR PACKED CLAY TO PREVENT SURFACE CONTAMINATION FROM INFILTRATING THE FILTER PACK <br /> AND ENTERING THE WELL. <br /> H. "DEVELOP" THE OBSERVATION WELL BY FLOODING IT WITH WATER AND THEN PUMP IT OUT. <br /> THIS ACTION WILL DRAW DRILLING MUD AND FINE PARTICLES OUT OF THE FILTER PACK, <br /> IMPROVING THE PERFORMANCE OF THE WELL. <br /> I. AUGURED HOLE SOIL CHARACTERISTICS WILL BE RECORDED. <br /> J. OBSERVATION WELLS SHALL BE PROTECTED FROM DAMAGE DUE TO TRAFFIC OR OTHER <br /> HAZARDS AND REMAIN ACCESSIBLE FOR FUTURE USE AND OBSERVATION. WHERE LOCATED IN <br /> TRAFFIC AREAS, DRIVEWAY MANHOLES AND COVERS SHALL BE INSTALLED. <br /> 5. OBSERVATION WELL MONITORING AND DATA <br /> A. ESTABLISH A BENCHMARK AND DETERMINE THE RELATIVE ELEVATIONS AT THE TOP OF EACH <br /> TEST WELL PIPE. <br /> B. MONITOR THE WATER AND DEPTHS IN EACH PIPE. <br /> NOTE: IT IS IMPORTANT THAT ALL MEASUREMENTS BE FROM THE TOP OF EACH PIPE TO THE WATER /OR <br /> PRODUCT LEVELS IN EACH PIPE. RECORD MEASUREMENTS TO THE NEAREST EIGHTH INCH. <br /> C. PRODUCT SHOULD BE PUMPED OUT OF THE OBSERVATION WELLS ONLY WHEN DIRECTED BY <br /> HEAD OFFICE. PREMATURE REMOVAL OF SAID PRODUCT COULD CAUSE INCORRECT WELL <br /> "READINGS". <br /> WELL EOUIPMENT/MATERIALS <br /> 1. OBSERVATION WELL PIPE <br /> A. SCHEDULE 40 PVC PIPE(4.5" OD-.237 WALL THICKNESS) AVAILABLE IN BOTH FACTORY SLOTTED <br /> AND STANDARD PIPE WITH FITTINGS AND CAPS AVAILABLE. <br /> B. SIX, EIGHT, TEN AND TWELVE INCH SCHEDULE 40 PVC PIPE ALSO AVAILABLE WITH FACTORY <br /> MACHINE SLOTS AT TWENTY THOUSANDTHS OF AN INCH. <br /> C. FACTORY SLOTTED PIPE AVAILABLE FROM THE FOLLOWING MANUFACTURERS: <br /> 1. 2" TO 14" AVAILABLE <br /> GATOR PLASTICS, INC. <br /> BOX 15020 BROADVIEW STATION <br /> BATON ROUGE, LOUISIANA 70815 <br /> TELEPHONE: 504/926-0100 MR. TOM HAYES <br /> 2. 2" TO 14" AVAILABLE <br /> HYDROPHILIC INDUSTRIES <br /> 5815 A NORTH AMERICAN <br /> PUYALLUP, WASHINGTON 98371 <br /> TELEPHONE: 206/927-4321 MR. PHIL GALLAGER <br />