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3.0 Piezometer Design <br /> Figure 3 (left side) shows a typical 2" diameter piezometer configuration (no centralizers <br /> are required and grout required only for surface seal). This "above ground" design is <br /> typical for piezometers that will be used for 1 or more years. An alternative design for <br /> short-term use and lower cost, uses a 3/4" stand pipe piezometer and schedule 80 PVC pipe <br /> installed in a surface vault (Figure 3 right side). The material and installation labor cost for <br /> the 3/4" design is significantly less that for the 2" design. However; the 2" design allows <br /> airlifting can be used to development of the piezometer necessary for accurate water level <br /> readings, where as 3/4" design requires a gravel or sandy packing of the well and care <br /> during installation to not plug the inlet holes. <br /> PROTECTIVE COVER <br /> CLEAR <br /> E RAN mm1 NttTt11OC[c1NG CAP <br /> f SAMPLER WELL IVENTIf1CATION V+NUD S <br /> I_ 1NSIl1E AND OVTSIOE TriE CA➢ ui <br /> TOP CF RISER 31L(to m).... <br /> ei ... .... VPNTEO CAP <br /> ASM1 GRAD£ f WASHED PEA GRAVEL CR7 WARS@$V0 M1 NUKE w <br /> SLOPE BENYTLW1[EiSCIL MIXTURE p1((7fEGf1VE CAS1K, <br /> OR d im(101 m)THICK CONCRETE .' <br /> PAD AWAY TROM CASING 1,+M.(fx)MM)WEEP NOSE <br /> AT 6 01.AGM GRUVW LEVEL x <br /> r 2 <br /> a <br /> SLOPE C~MYAY <br /> CASING OR RISER TO 1 tt,-5 R.(1.0 W 11 m)EXIMEO <br /> PROTECTM CASING v U <br /> PREVENT 1NF1LvAnC N,am o <br /> 60 NW CREATE A MVSWOOM - DEPTH TO Er10W FROST L[W x � <br /> fOR Gwjvt WH1CN WILL 6E <br /> -%WELT TO fAOST HEM <br /> NEAP CEMENT GROtR `ti^ <br /> `v <br /> `u <br /> DRY RENTON[TL <br /> v <br /> �a <br /> $n <br /> HINIMIA!2�n(S0 mm)1D RISER W1Ttt Sc <br /> fLLSN i1 .EAOEO CO)RNELTIONS � n <br /> 2s <br /> - <br /> AS NECESSARY �� A <br /> r <br /> BOREHOLE WALZ <br /> 3r s <br /> d <br />�. Ct4TRA1..1ZER5 <br /> AS NKZ-$ AY <br /> PLUG- EEDIMENTSL".P(As A.PPRF9fRm-) <br /> Figure 3: 2" Piezometer Design, 6" Surface Vault, 3/4" Standpipe Piezometer <br />