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<br />e <br /> <br />e <br /> <br />e <br /> <br />salt and alkali; and when tested by standard laboratory methods, <br /> <br />shall conform to the followinB requirements: <br />Tbe maximum percentage of deleterious substances shall not exceed <br /> <br />the following values by weight: <br /> <br />Removed b.1 decantation <br />Clay lumps <br />Shale <br />Soft fragments <br />Other 10 ca,1 deleterious substances <br />such as friable pieces <br />The sum of the percentages of all above <br />constituents shall not exceed <br /> <br />4% <br />0.25% <br />0.25% <br />3% <br />3% <br /> <br />5% <br /> <br />e <br /> <br />The wear for crushed stone or gr~vel shall not exceed the following <br />:gercentages: <br /> <br />Crushed stone <br />Gravel <br /> <br />3% <br />17% <br /> <br />Coarse aggregEte shall conform to the grad:Lng requirements given <br />belot.! 't11'hen tested on standard screens, and shall te 'trell gre,ded <br />within the limits specified. <br />Co~rse Aggregate (Crushed Stone, or Gravel) <br /> <br />Sieve Size <br /> <br />Per Cent Passi~ <br /> <br />It in. <br />3/4 in. <br />3/8 in. <br />#4 <br /> <br />Clay - 1% Max. <br />4. Concrete: The concrete shall be cocposed of <br /> <br />95-100 <br />40- 70 <br />10- 30 <br />0- 5 <br /> <br />e <br /> <br />standard Po~tland cement or an approved high, early strenr,th cement, <br />fine ag~regate, coarse aggregate, and water, mixed and proportioned <br />to give a dense, workable mixture. The concrete shall have a mix <br /> <br />of a~proximately one part cement, two parts fine aggregate, four <br /> <br />yarts of coarse aggregate, and shall contain not less than five <br />sacks of cement per cubic y~rd and not more than seven g&llons of <br />water net per sack of cement. <br />5. Sub-Base: The sub-base shell consist of firm, <br />hard soil from which all grass, traSh, roots, and other loose materia.l <br />4t has been removed. In the event it is necessary to fill any area <br />where a sidew~lk is to be constructed, the fill shall be made of <br />compactable clay, placed in six (6) inCh layers, and thoroughly <br /> <br />tam~ed ~ith rollers or hand tamps. Such fill shall extend a minimu m <br />