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7�c �ca <br /> ,- ,�,yy{{ 1.- �, K:- .� p,r's ' :%air` "z"-�'�. rs'F'-�±, +?x v,C.r, n "..•d. xL sc rY , •;:a .. r;;fr" [ ,, .: zrkns,�t <br /> G!J .G6.•_r, '3''ap iY" f�W 4Y ''.�w`k:�4'' eY. .sl. `' F r rcF�-,sl ?...,.-�7yt�. .r,zr't-"7a r 3'' -t4... '.n4' �, b �r p•'u '�.. p Si•7rta <br /> ,'� h,P°;r.-,-t�:�,�. <br /> n " 'F La .sN^a Lr 'F ° r;f �Fi:. ✓ ,✓ 3. 'Y rte. !:^-4 1vL � -�i-r k fr' v, r .� �xr�•- Y ;k +.,.s. . <br /> v� �IJ''w r`aA ��' d l.✓�=i=.r � �'y hf-'-'+�,1- ...t! .� ��n:�L .J-.''Y1_ F' - J <br /> y <br /> 7[ <br />{N <br /> t <br /> a <br /> i <br /> The annulus of the perforated section will be packed with clean no. <br /> 3 or 4 Monterey sand, or equivalent, for the length of the screen <br /> and approximately 2 feet above the uppermost slot. In order to <br /> create a spacer between the sand and annular seal two feet of <br /> bentonite will be placed on top of the sand envelope pack. An <br /> annular veal of cement grout composed of Portland Type I/II cement <br /> (94 pounds/5 gallons water) will be placed immediately above the <br /> bentonite layer to approximately 3 inches below surface grade. A <br /> sand-cement slurry may also be used with a minimum 11 sacks of <br /> Portland-Type cement per cubic yard. If a sand-cement slurry is <br /> used it must be mixed off-site at a batch plant. If more than 30 <br /> feet of seal is required the sealant must be tremie-piped within 3 <br /> feet of the underlying material or bottom of the well. <br /> 6. An above-grade or at-grade well completion will depend upon the <br /> final well location. Above grade completion will require a 6-inch <br /> diameter locking, steel, waterproofed, protective casing set into <br /> a concrete pad. A sketch of an above-grade completion -- phown in <br /> Figure 2. An at-grade completion will require a steel casing and <br /> a Christy, of equivalent, traffic box and a concrete pad with <br /> approximately 3 inches of slope away from the center of the well <br /> box. The purpose of this is to prevent surface runoff from <br /> entering the well box. A sketch of an at-grade completion is shown <br /> In Figure 3. A watertight cap will be installed on the well head <br /> and the top of the well will be secured i4ith a locking calx and kept <br /> locked. <br /> 7. The cover of the well will be marked "Monitoring Well". A <br /> small metal tag will be pormanently attached to the well or within <br /> the well vault. This tag will include the well number, hole and <br /> casing diameters, location of screened interval, and total depth of <br /> i <br /> the well. <br /> B. All borings will be sealed with a mixture of Portland Type 1/1I <br /> cement by tremie-piping to within at least 3 feet from. the true <br /> bottom of the hole. <br /> WELL DEVELOPMENT <br /> I. All wella will be developed no earlier than 72 hours after seal <br /> emplacement and no later than a week after initial well <br /> installation. The wells will be purged and sampled at least 72 <br /> hours after well development. <br /> 2. wells will be developed until water is free of fine-grained <br /> sediments and/or until field measurements of Ph, conductivity and <br /> temperature stabilize. At least 5 and up to 10 well volumes of <br /> water will be removed during the development of the well.. This <br /> water removal is accomplished by either bailing with a 1.5--inch <br /> diameter PVC bailer or using a bottom loading airlift pump. All <br /> downhole tubing will be flushed with TSP soapy water, rinsed with <br /> tap water, rinsed with ui2tilled water and air dried prior to and <br /> 275 Grantline Rd. DSSP Page 2 of 6 <br />