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General monitoring well construction <br />we-, is are s':nL-n 0 r <br />cons ,-ucticn for each monitoring well are <br />3. <br />*+^ tcr_nq we`ll Casin <br />El <br />details for the <br />®. Details Of <br />"resented in . ab:. e <br />A screen <br />Opening size of 0.005 <br />inch <br />was cliosen 'or. <br />mon_ to_ _ng <br />weds .�-1 ®hrouah P'r�r*-s <br />.ti'`.y ..::e <br />r_ .;7 e_ _ eng_neer <br />section). in. <br />based on sieve analyses (described <br />in the <br />next <br />steel- <br />order t0 <br />a :h:.eve a reasonable tolerence, <br />stair:less <br />cos+ng `a5 <br />croered instead of Pv'C. <br />The screen <br />oper.jncs are <br />–he <br />between 0.003 inc : and <br />exaected .o vary be <br />C. Z5 _.. . <br />E -green iS 4-.1nC:_1 diameter, in'arE�i+�.r.,a s =Een, .i.';-:: the-P.a s <br />d'areter, <br />®wel to <br />®ani., <br />4 inch <br />threaded, <br />6chedule 40 PVC casing. <br />Monitoring wells Mw -9 and <br />rp;-20 were <br />constructed with 4 inch <br />diameter, threaded, wire - <br />wound 7.0 <br />screen with an opening size cf <br />0.01 inch. This <br />screen was <br />also screwed to blank, <br />4 inch <br />diameter, threaded <br />schedule 401 <br />PVC casing. <br />_ <br />v% 'ie cerate: <br />..;�e =:,-:%_�: ^.y ;„E'_1 :'a5:.ng .:as 5 S ._ _ <br />Gf the hc_®oW s e= augers d:.rectly after t:,e bCrE;l ees Were <br />le_ <br />reamed. The augers were � <br />in the ground during <br />W0nitrring well construction to act as a centralizer for the <br />Casing. <br />Filter Pack <br />An ideal f_lter pack was calculated for each we11, based on <br />sieve analyses performed on a rifer ;.�ater�rl collected <br />zri g t e initial drilling. The method outlirie.d in the <br />dn _ �j q by <br />Call`i `Pr®,� a Cate :1�1tagC:�aGn Design Tree L.aS L®il®Me,►e '^he <br />Ca_ r_ \/_ i.A %,ppen4—ix <br />results Of the sieve analyses are presented an <br />B. The calculated falter park castricu l'.'s are an\.:LOed on <br />each sieve ata-Lvsas C17LaL— .. <br />^he prese-:ce of clay and s', ` in the screened in:es-` als fer <br />d t*1-.rOz=,h ?;'w-8 res _ted In Ca�CL:�ated <br />r•, ••; ®P inr We.�wS id Yt-1 a.s... • q _ ire—wound <br />und <br />_Ai -e_ ra_Ks ....a` were too _ane _c_ ,.he s... es <br />e The f'lter pack <br />screen openings t hat could be manufactu.r . - <br />G:.stt®.^.n selected was coCrC�:late,:. with the encaneer <br />assigned o the project from the Califor:.�a State Department <br />;. <br />of Health Services, ToxiCS substances Can`rol Division. <br />This firer pack was designed to be as close as possible to <br />an average of all the calculated a1 �e_ pa.. `- <br />bat coarse enouch for the smallest- screen cpenln-Ts that <br />could be Obtained. The cistribution was designed with a <br />coarse tt <br />ail and a Fine ail. The grain s-ze distribution of <br />this cussOm blended filter pack is included in appendix C. <br />