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foot long, 2-inch diameter Schcdulc 40 PVC Flush joint sump and cnd cap shall be fixed to the bottom cnd of the well screen. The annulus of the borehole will be backfillcd as the hollow stun auger arc retracted. "fhe annulus sun'ounding the well screen and sump will be backiilled with 10-20 silica sand over the entire depth of the well screen. A bentonite seal will be placed above the sand pack to backfill the borehole annulus to grade. Care will be exercised during backfill operations to inhibit annulus backfill from entering the well casing. Drawing 3 depicts the details for well construction. DPI; wells do not require well development. Each DPI well will be fitted with a 3/4-inch diantcrer Schcdulc 40 PVC (lush joint drop wbc. "1'hc drop tube will be positioned in the DPI; well casing such that the bottom end of the drop tube is no grruu the 2.0 teal below the stalk ground water Icvcl. A rubber boot positioned between the drop attic and DI'L well casing will be used to seal the wellhead, and susputded the drop tube in place. '1'hc rubber boot shall also allow minor adjustments to position the depth of the drop tube. Stainless steel hose clamps will be used to fix the ribber boot to ate well casing and drop lobe. 4.2 rYIECIlANICAL 4.2. ( Pipir:g, Fittirrgs and Valves ERM shall furnish all labor, materials, equipment, and incidentals accessary to install the piping, linings, and valves depicted in Drawing I through Drawing 3. Piping runs from the vacuum manifold to the DPE wellheads shall be of 2-inch nominal diameter PVC pipe, with a maximum pressure rating of no less than 100 psi. All fittings shall have a maximum pressure rating of trot Icss than I50 psi. Piping for the vacuum manifold shall consist of 2.0-inch nominal diameter Schedule 40 PVC pipe as indicated on the drawings. LRM-Rocky t.9ountain, hu. 7 Printed on Recycled Paper P:\ 1000\S W PC\9G 1019. I \Design. Doc