1925 (#1403-1607) - Laserfiche WebLink

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No fill shall be widened by dmnplng Io~e nmterinl over their slopes. V~hen a fill is to be widener, the new material shall be bonded to the old by cutting steps into the existing slope and by placing the layers as specified above. Whun special flooding is required, the ~ntractor shall perform the same in accord- ance with the requirements as specified on the plans. (b) MUD AND SOFT MATERIAL. ~A~hen mud or other soft or spongy material is encountered, it shall be removed and the space filled with gravel or good earth, which shall be placed in layers as hereinbefore set forth for fills, an~ rolled until the surface ceases to move or creep under the roller. The Contractor will not be required in such cases to excavate mud or other soft or spongy material to a depth greater than two (2) feet below grade. V~'henever any area is too wet to pern~t of thorough rolling, the tractor shall wait until the material has dried su~ciently and then complete the rolling. 8~TION 3, SUB-GRADE. After the rough grading has been completed, thc surface of the street shall be bi, ought to the required grade and cross-section, and the sub-grade prepared as follows: (a) FOR PAVEMENTS. After a block or section has been graded to approximate grade, the surface shall be thoroughly dlsced to a depth of at least six (6) inches and then thoroughly moistened by a process of alternate sprinkling and dlscing until thc moisture has penetrated uniformly to a depth of at least six (6) inches. ~*hile it is moist, it shall be thoroughly rolled until it is hard and unyielding, with a macadam type roller, weighing not le~s than twelve (12) tons. All depressions made by the rolling, or from other cause, shall be filled with good earth, and all high places leveled off, after which it shall be lightly discod and again thoroughly rolled. This process is to be continued until the surface of the subgrude conforms to the true grade and crors-sectiun, and is smooth and unyielding. All places that cannot be reached by the roller shall be hand-tamped until it is firm and hard. After being refilled, all excavations, pipe trenches, etc., which were more than one (1) foot in depth below the subgcade elevation, and that cannot be coiled satisfactorily, shall be hand-tamped until solid. V~'here the pavemeat to be lald, does not join a curb or ~uttor at the edges, it shall, after being thoroughly moistened, receive the first rolling before the header boards are set. Such rolling shall extend at least eighteen (18) inches beyond the header board limits. All subgrade for pavement shall be ~uaged by a true templet conforming to the cross- section of the subgrade* Such templet shall be furnished and used by the Contractor and shall be of such desisn that the end ~2ides will rest on the ~utters or temporary header boards and permit of dra~ing along the lensth of the roadway. Such templet shall not be less, in length, than one-half (~) the width of the pavement. (b) FOR CURBS, SfD]~V~*ALKS, AND GUTTERS. After the rough grading has been completed, as specified hereinbefore, the foundation shall bo brouaht to enh~"~lde and tamped or rolled until solid. Vv'here the subgcade is composed of adobe or other swelling soil, the upper two (2) inches shall be removed and replaced with a sand cushion unless otherwise specified. Where the curb line does not conform to existh~ curbs and surfers, or new curbs are to be built, the existing curbs and ~utters shall bo removed, unless other. wise specified, and the space filled in with sound earth. All subgrade for sidewalks and gutters shall be determined by a guage extending to the full depth of the couercte, and supported by side strips set to grade. Sub~radlng for curb or pincin8 of sand cushion on swelling soll shall be done before curb forms have been set. SEOTXOB' 4, (~O](DI'~XOI( OF STREE~ DI~RII((~ GRADLqG, During the gradln~, the surface of the street and street crossings shall be maintained in a reasmmbly good condition for tra~c. Proper dralnuge must be maintained at all times. 'vVhere there is a car line, suitable landing places shall b~ loft undisturbed as loni~ as possible for the cunvanleuee of the paasun~ars.