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• 1 <br /> [3. Unimprovcd arca or landscapc arcas shall be compacted to 90% of <br /> maximum dry dcnsity. <br /> 3.09.5 Trenchine Loneilttdinal to Roadwav <br /> Sc���er, water and stonn lincs that are within the roadway sectio❑ 1nd <br /> longitudinal to the road�vay shali be backfilled with native m�terial or Gra�el <br /> Borrow as approved hy the city enginecr to the pavement patch level or sub- <br /> gradc whiclie��er applies. All othcr utility cuts such as gas, telephonc, power, <br /> and cable TV shall be backfilicd with controlled dcnsity fill. <br /> 3.09.6 Trenchine Tr�nsverse to Road�vav <br /> lJtiliry trenching that crosscs transversely to the roadway alignment will <br /> generally not be pemiitted unless it can be shwvn that alternatives such as <br /> jacking, auguring or tunneling are not feasiblc or unless thc utility can be <br /> installed just prior to rcconstruct�on or an flverlay o�the road. Should an open <br /> cut be approved, the trench shall be backtlled with controlled density fill. <br /> When high ground water levcls are encountered, relief drains shall be installcd <br /> at l5 Ccet intervals to prevent damming. Thc rclief drains shall bc 3 inch PVC <br /> and placed at a minimum 3 fect from finished grade or as othcnvise approved <br /> by the city engineer. <br /> 3.09.7 Jackina Au�crina, or Timnelina <br /> Tunneling may be ordered by Ure city cnginecr wider pavcmcnts, buildings, <br /> railroad tracks, eta The developedcontractor shall install the pipe by jacking, <br /> auguring or tunneling, or installing the pipe in a casing pipe by a combmation of <br /> these methods. <br /> Whcn use of a casing pipe is required, the developer/contractor shall be <br /> responsible to select thc gauge and s:ze required, unless othernise indicatcd on <br /> thc drawings, and consistent with his jacking or auguring operation, and shall bc <br /> set to line and grade. During jacking or auguring operations, paRicular care <br /> shall be exercised to prevent clving ahcad of the pipe which will cause voids <br /> outside the pipc. When the carricr p�pe is installed witliin a casing pipe, thc <br /> carrier pipc shall be skiddcd into position in an acceptable manner and to thc <br /> linc and grade as designated. The annular space Uebvicen ihe casing and lhc <br /> pipe shall be filled with controlled density fill or as othernisc approved. <br /> The faces ef the jacking pit shall be constructed by driving sleel shects, or <br /> instaGing limber lagging as Uic excavation proceeds. The sheets, or lagging, <br /> shall extcnd a minimum of 5 fcet below tlic Uottom of thc pit except at the <br /> cntrancc of thc utility. Prior to jacking or auguring activitics, shop drawings <br /> describing tliese activities, including dimensioning of pit length and sizc of <br /> widerground borin�s and compicte descripiion of shori�ig, shall bc suUmitted to <br /> thc city cnginccr for approval. <br /> � <br />