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flowing or heaving sands This bind- ing can generally be overcome by Geoprobe Madel GS1000 ' lowering extension rods down the Grout Machine inside of the well user and gently, Plastic Plug but firmly, tapping the extension (13227) rods against the base of the well as the rods are slowly retracted If the binding persists, clean tap water or t distilled water may be poured down ' the annulus of the rods to increase 1)Fill Probe Rads oath the hydraulic head inside the well grout from bottom up This step,combined with the use of 2)continue operating Grout extension rods, will free up the Pump while retracting rods prepacked screen and allow for proper screen placement Side-Port Tremie Tube Once the well is set, conventional High Solids (Flexible Tubing 14299} Bentonite Slurry flush-mounted or aboveground well or Neat Cement Grout protection can be installed to prevent Bentonite Seat ' tampering or damage to the well head (Fig 2 2) Prepack screen Grout Barrier monitoring wells can be sampled by ' several available methods(peristal- tic pump, mini-bailer, Geoprobe's tubing check valve, etc) to obtain high integrity water quality samples These wells also provide accurate water level measurements and can ' be used as observation wells during aquifer pump tests Additionally, FIGURE 2 3 commercially available interface Grouting Well Annulus with probes can be used to detect and Geoprobe Grout Machine measure the thickness of free prod- uct(LNAPL and DNAPL)inside the wells When installed properly,these small diameter wells generally meet regulatory requirements for a perma- nent monitoring well While a detailed installation procedure is given in this document,it is by no means ' totally inclusive Always check local regulatory requirements and modify the procedure accordingly Standard Operating Procedure Page 5 1 Qin x 2 5-in OD Prepack Screen Monitoring Well