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reached , and excavate to such additional dept ured , excavate Cn such maneliminate to al ow ghe er of undermining . Wherever rock bottom sse solid rock to be exposed and prepared thin strata . Haverizontal ds for he Engineer receiving the masonry , Remove inspect and approve all all loose and disintegratedrock foundation excavations prior to placing masonry . 120 -3 . 4 . 2 Earth Excavation : 120 -3 . 4 . 2 . 1 Foundation Material other than the Rock : When masonry is to rest on an excavated surface other than rock , take special care to avoid disturbing the bottom of the excavation , and do not remove the final foundation material to grade until just before placing the masonry . In case the foundation material is soft or mucky , the Engineer may require excavation to a greater depth and to backfill to grade with approved material . 120 -3 . 4 . 2 . 2 Foundation Piles : Where foundation piles are used , complete the excavation of each pit before driving the piles . After the driving is completed , remove all loose and displaced material , leaving a smooth , solid , and level bed to receive the masonry . 120 -3 . 4 . 2 . 3 Removal of Obstructions : Remove boulders , logs , or any unforeseen obstacles encountered in excavating . 120 -3 . 4 . 3 Rock Excavation : Clean all rock and other hard foundation material , remove all loose material , and cut all rock to a firm surface . Either level , step vertically and horizontally , or serrate the rock , as may be directed by the Engineer . Clean out all seams , and fill them with concrete or mortar . 120 -3 . 4 . 4 Pipe Trench Excavation : Excavate trenches for pipe culverts and storm sewers to the elevation of the bottom of the pipe and to a width sufficient to provide adequate working room . Remove soil not meeting the classification specified as suitable backfill material in 120 -8 . 3 . 2 . 2 to a depth of 4 inches below the bottom of the pipe elevation . Remove rock , boulders or other hard lumpy or unyielding material to a depth of 12 inches below the bottom of the pipe elevation . Remove muck or other soft material to a depth necessary to establish a firm foundation . Where the soils permit , ensure that the trench sides are vertical up to at least the mid - point of the pipe . For pipe lines placed above the natural ground line , place and compact the embankment , prior to excavation of the trench , to an elevation at least 2 feet above the top of the pipe and to a width equal to four pipe diameters , and then excavate the trench to the required grade . 120-4 Disposal of Surplus and Unsuitable Material. 1204 . 1 Ownership of Excavated Materials : Dispose of surplus and excavated materials as shown in the plans or , if the plans do not indicate the method of disposal , take ownership of the materials and dispose of them outside the right- of-way . 1204 . 2 Disposal of Muck on Side Slopes : As an exception to the provisions of 120 -4 . 1 , when approved by the Engineer , muck (A- 8 material ) may be placed on the slopes , or stored alongside the roadway , provided there is a clear distance of at least 6 feet between the roadway grading limits and the muck , and the muck is dressed to present a neat appearance . In addition , this material may also be disposed of by placing it on the slopes where , in the opinion of the Engineer , this will result in an aesthetically pleasing appearance and will have no detrimental effect on the adjacent developments . Where the Engineer permits the disposal of muck or other unsuitable material inside the right-of-way limits , do not place such material in a manner which will impede the inflow or outfall of any channel or of 22 Technical Specifications F :\Public Works\ENGINEERING DIVISION PROJECTS\0744-8th St-USI to 6th Ave\Admim\bid documents\0744 CONTRACT DOCUMENTS\Technical Specifications .doc