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v <br /> imCN m <br /> elml <br /> - r' m 0 <br /> D Sox'€' <br /> La CS C „"-�y <br /> © °' 1, <br /> SLURRY WALL NOTES: V ° a <br /> BACKFILL EXISTINGc J- , <br /> bentonite Soecifications EI 0 o M <br /> TRENCH WITH NATIVE7 <br /> 1 u_n <br /> MATERIALS YP/PV ratio API Std 13A less than 3 <br /> Viscometer greater than 30 I' c°'> <br /> • <br /> eld <br /> Filtrate Loss less than 15 cm3 a <br /> Moisture Content ASTM D 2216 less than 10 percent . <br /> Test results for each lot of bentonite must be provided !' <br /> 1 5' TYP — SANDY CLAY 2 Water Specifications <br /> OVERBURDEN pH 6-8 <br /> Hardness less than 200 ppm <br /> VARIES ASTM C33-7 Total Dissolved Solids less than 500ppm <br /> CONCRETE Oil, organics, acids, alkali less than 50 ppm each <br /> AGGREGATE ' Chloride report ul <br /> N <br /> 2' 3 Bentonite Slurry General Specifications Z <br /> The initial bentonite slurry must be tested prior to placement in <br /> 1 °a (MN) the trench The slurry may be mixed in high shear mixers or a <br /> mixed and hydrated in slurry hydration ponds In general, a U. N <br /> a i <br /> minimum hydration time of 8 hours will allow the bentonite slurry .6 N <br /> ASTM C33 a e y o J to meet all criteria A minimum bentonite content of 6 percent in Y <br /> CONCRETE SAND fthe slurry by weight is required 42 15 <br /> (IF REQUIRED) VAIN ES, eCI <br /> <` 4 0' 4 Bentonite Slurry Testing Specifications before Placement c <br /> SAND AND GRAVEL Viscosity Measured w/ Marsh Funnel (API RP 138-1) less W I O <br /> < e ALLUVIUM than 40 sectd <br /> Density less than 64 pcf <br /> a Off• 05' Filtrate Loss less than 20 cm3 g <br /> 1 5' 1 ,(TYP) o Y (TYP.) pH 6 5 to 10 d <br /> TYP 8 <br /> L The tests listed above should be run 1 or 2 times per shift and <br /> at least once per batch of slurry The slurry must be further <br /> f tested after placement in the trench The tests conducted are for <br /> viscosity, density, sand content, and pH Two sets of tests per <br /> 3' shift at two locations in the trench (approximately 2 feet below <br /> 4, the slurry surface and 2 feet above the bottom of the trench) <br /> are required If the density of the slurry in the trench exceeds 85 r <br /> PERIMETER DRAIN DETAIL (TYPICAL SECTION IF REQUIRED) pcf the excess solids must be removed by desanding or the slurry <br /> replaced with fresh slurry The slurry level must be maintained at C c <br /> least 3 feet above the ground water elevation and no more than <br /> 2 feet below the top of the working platform a+ n <br /> co d ..- <br /> 5 Bentonite Slurry Testing Specifications after Placement <br /> 2 Unit Weight 1 03 to 1 40 gm/cm3 =4 ) <br /> Q Sand Content ASTM D 4381-84(1993)e10 to 20 percent by <br /> cm <br /> volume ; 14. 0 <br /> N O ( 0 <br /> 00 6 Soil—Bentonite Backfill Specifications ` N <br /> ro S—B backfill slump ASTM C 143 1 set per 100 cu yds Q L <br /> d <br /> O CI <br /> Slump 2-6 inches = <br /> N <br /> co S—B backfill gradation 1 set per 300 cu yds <br /> co <br /> ,1Screen (US Standard) Percent by Dry Weight m <br /> m 3 inch 100 <br /> # 4 40-80 <br /> 8 <br /> #40 25-60 <br /> tin #200 20-40 i I <br /> I I <br /> o <br /> Minimum Plasticity Index of 10 <br /> 2 VARIES <br /> m u_ 7 Key Trench and Slurry Wall Cop Specifications `o_ <br /> E O a During excavation, soundings should be obtained to determine the n— <br /> .czi <br /> - z elevations of the top of the key layer, the bottom of the co , <br /> 02 <br /> excavation, and the bottom of the trench prior to backfilling If Z o <br /> VARIES sediments in excess of 2 inches have accumulated it is necessary O v <br /> co aJI OVERBURDEN AND TOPSOIL to clean the trench bottom by airlift pumps or excavation N I <br /> O u_i L" BACKFILL ALL DISTURBED AREAS equipment to remove the sand and sediment that has settled The w <br /> ` aM CC <br /> CI_ <br /> J DOWN TO WATER SURFACE trench bottom should be cleaned, as a minimum, at the beginning <br /> o as _J 3 of each shift Soundings should be obtained approximately every <br /> 20 feet <br /> \` ' ',\7,,,, = WATER SURFACE ,,_ ci <br /> • " / \,/ ,/ Adequate keying in the S—B backfill to an impermeable layer at <br /> o \�\,; /\�\j\��\��.`j� the base of the wall will be required and specified in the final mvi iii <br /> / / // /. / // design report for the slurry wall The design documents will include <br /> " •/\ \\/\\A\/\`/ 3 y a description of the key in layer and describe how trench cuttings <br /> CIS '.j y; NATIVE \/\\//;\/\/�\�\/ S Op or other observations will be used to assure that the slurry wall m - <br /> 'MATERIAL will be adequately keyed Temporary slurrywallprotection will be ro <br /> Q. �X/ '',X,,,, <br /> , ‘\ \� \' /�\��\� ,, q Y Y P ry o <br /> co ��� :;- / !// �// -//7 ,/\ /`//`7‘ , \� required in the form of a noncampacted soil cover placed within Lo <br /> /\� '/ �\/� \/ 1\/\\\,,\` \ \\ ,\ /\\ one day over each backfilled 100 foot reach The temporary cover z <br /> m - is removed after settlement (approximately 2 weeks) and replaced <br /> E with a compacted clay cover over the completed slurry wall <br /> 77, TYPICAL BACKFILL SECTION 8 Post Construction Testing <br /> CLeD N.T S Post construction testing will be conducted in accordance with the <br /> pn "Colorado State Engineer's Office" J&T Consulting, Inc <br /> C <br /> m9 Above specifications (notes 1-8) are provided as a general • - <br /> guideline for permitting purposes Final specifications and design <br /> criteria will be developed during the final design of the slurry wall <br /> a <br /> C) <br /> m Job# 07123 <br /> 0 Date _--_ 21318 <br /> Drawney WSS <br /> N <br /> 0 <br /> Desgned By TPY <br /> M Checked By _ JCY <br /> N <br /> Fed JT-Derr 2018 Rec <br /> EScale = <br /> a Sheet: of <br /> 3 3 <br />