The Coconino sun., 1916-04-21

specifications which has heretofore been adopted by the Mayor and Con- mon Council of the Town of Flag staff.
 All cement sidewalks hereafter con- structed shall be built under the supervision and control of the Super intendent of Street of the said Town of Flagstaff; or his duly authorized representtive, and according to the following specifications and require ments.
 a. Walks built in the business district shall be built to the curb line.
 b. The outer edge of the cement walks in the residence district shall be five (5) feet from the street line and parallel to said street line, unless otherwise directed by the Superin- dent of Streets; the walk to extend continuously from the street line to the outer edge and not to be more nor less than five (5) feet in width. c. The outer edge of the curb shall be placed ten (10) feet from the street line in both residence and busi- ness districts.
 d. The curbs at alleys and street corners shall turn in and extend to the walks, and walks at such corners shall extend to the curb to meet the street or alley crossings, unless other wise directed.
 e. Stakes shall be set by the Town Engineer to define the edge of the walk with grade marked thereon to indicindicate the top of the finished walk, which shall be furnished without cost by the Town. All walks to have a slope toward the curb of one-quarter (h) inch to the foot.
 f. All walks at alley crossing shall be constructed so as to give free in- gress and egress to the alley and flush with the top of the adjoining walks.
 g. Openings for drainage shall be left under all alley crossings where necessary; the sizes of such openings to be decided by the Town Engineer.
 FOUNDATIONS:
 All materials excavated in con structing the foundations shall be classified as earth, loose rock and solid rock, and the prices bid for these classes of excavation, and for the em- bankment necessary to bring the side walk foundation to the proper sub grade, shall apply to all work neces- sary for the proper grading of the foundations.
 Where considered necessary by the Town Engineer, some points mate rial, such as gravel or cinders, shall be used to bring the foundation up to the proper sub-grade, and proper drainage provided for the same.
 All foundations shall be cleaned of all trash and vegetable matter, and thoroughly rolled or tamped and dampened before placing any concrete upon the same.
 RETAINING WALLS:
 Where considered necessary by the Town Engineer, a stone or concrete retaining wall shall be built to retain the sidewalk foundation.
 CEMENT
 The cement used shall be Portland cement and must conform to the re- quirements and be subject to the tests as set forth in Specification No. IA, of the Town of Flagstaff.
 FINE AGGREGATE:
 Fine aggregate shall consist of sand or screenings from hard, durable crushed rock or gravel consisting of quartzite grains or other equally hard material, graded from fine to coarse, with the coarse particles predominant ing and passing, when dry, screen having one-quarter (A) inch open ings. It shall be clean, free from dust, vegetable or other deleterious matter, and all fine aggregate con- taining more than five (5) per cent clay or loam shall be washed before using.
 COARSE AGGREGATE:
 Coarse aggregate shall consist of clean, hard, durable crushed rock or gravel, graded to size, free from dust, loam, vegetable or other deleterious matter, and of such sizes as to pass two and one-half (2h) inch round opening and to be retained on screen having one-quarter (A) inch open ings.
 NATURAL MIXED AGGREGATE
 Natural mixed aggregate shall not be used as it comes from deposits, but shall be screened and used as speci- zI