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D. USE SLOTTED PIPE FROM THE BOTTOM OF THE WELL HOLE TO APPROXIMATELY 3 FEET ABOVE THE MAXIMUM GROUNDWATER TABLE, CONSIDERING WATER TABLE FLUCTUATION. THE SLOTTED PIPE SHALL BE CAPPED AT THE BOTTOM. E. THE BLANK PIPE SECTION ATTACHED TO THE TOP OF THE SLOTTED PIPE AND EXTENDS UPWARD TO JUST BELOW GRADE ELEVATION. AVOID USING GLUE TO COUPLE THE PIPE SECTIONS; RATHER, USE THREADED PVC PIPE OR OTHER COUPLING METHODS WHENEVER POSSIBLE. A LOCKABLE CAP SHALL BE INSTALLED ON TOP OF THE BLANK PIPE. F. ONCE THE SLOTTED AND BLANK PIPE HAS BEEN SET IN THE HOLE, BACKFILL WITH A FILTER PACK OF POROUS MATERIAL SUCH AS PEA GRAVEL. THE FILTER PACK SHOULD BE FILLED AROUND THE PIPE TO AT LEAST 2 FEET ABOVE THE TOP OF THE SLOTTED SECTION. DO NOT BACKFILL AROUND THE SLOTTED PIPE WITH CLAY OR OTHER MATERIAL WHICH WOULD IMPEDE GROUNDWATER FLOW INTO THE OBSERVATION WELL. G. ABOVE THE FILTER PACK, BACKFILL WITH CLEAN, DRILLED SOIL MATERIAL TO APPROXIMATELY 2 TO 3 FEET BELOW GRADE, AND TOP THE BACKFILL WITH A SURFACE SEAL OF CEMENT GROUT OR PACKED CLAY TO PREVENT SURFACE CONTAMINATION FROM INFILTRATING THE FILTER PACK AND ENTERING THE WELL. H. "DEVELOP" THE OBSERVATION WELL BY FLOODING IT WITH WATER AND THEN PUMP IT OUT. THIS ACTION WILL DRAW DRILLING MUD AND FINE PARTICLES OUT OF THE FILTER PACK, IMPROVING THE PERFORMANCE OF THE WELL. I. AUGURED HOLE SOIL CHARACTERISTICS WILL BE RECORDED. J. OBSERVATION WELLS SHALL BE PROTECTED FROM DAMAGE DUE TO TRAFFIC OR OTHER HAZARDS AND REMAIN ACCESSIBLE FOR FUTURE USE AND OBSERVATION. WHERE LOCATED IN TRAFFIC AREAS, DRIVEWAY MANHOLES AND COVERS SHALL BE INSTALLED. 5. OBSERVATION WELL MONITORING AND DATA A. ESTABLISH A BENCHMARK AND DETERMINE THE RELATIVE ELEVATIONS AT THE TOP OF EACH TEST WELL PIPE. B. MONITOR THE WATER AND DEPTHS IN EACH PIPE. NOTE: IT IS IMPORTANT THAT ALL MEASUREMENTS BE FROM THE TOP OF EACH PIPE TO THE WATER AND/OR PRODUCT LEVELS IN EACH PIPE. RECORD MEASUREMENTS TO THE NEAREST EIGHTH INCH. C. PRODUCT SHOULD BE PUMPED OUT OF THE OBSERVATION WELLS ONLY WHEN DIRECTED BY HEAD OFFICE. PREMATURE REMOVAL OF SAID PRODUCT COULD CAUSE INCORRECT WELL "READINGS" . WELL EQUIPMENT/MATERIALS 1. OBSERVATION WELL PIPE A. SCHEDULE 40 PVC PIPE (4 . 5" OD-. 237 WALL THICKNESS) AVAILABLE IN BOTH FACTORY SLOTTED AND STANDARD PIPE WITH FITTINGS AND CAPS AVAILABLE. B. SIX, EIGHT, TEN AND TWELVE INCH SCHEDULE 40 PVC PIPE ALSO AVAILABLE WITH FACTORY MACHINE SLOTS AT TWENTY THOUSANDTHS OF AN INCH. Page 10