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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 />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 AND/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 />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 />HYDROPHYLLIC INDUSTRIES <br />5815 A NORTH AMERICAN <br />PUYALLUP, WASHINGTON 98371 <br />TELEPHONE: 206/927-4321 MR. PHIL GALLAGER <br />12 <br />