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<br />(3) Whe.re soil is transported onto a public road surface, the roads shall be <br />cleaned thoroughly at the end of each day, or more frequently, in order to <br />ensure public safety. Soil shall be removed from paved surfaces by shoveling or <br />sweeping. Street washing shall be allowed only after shoveling or sweeping has <br />removed most of the sediment and street sewer inlet protection is properly <br />installed unless end of sewer sediment ponds exist and are properly functioning. <br /> <br />(4) Erodible material ramps in streets will not be used to enable equipment to <br />cross curbs. Non-erosive materials (e.g. wood and stone) can be used. <br /> <br />(m) Stabilization of Outfalls and Channels: Outfalls and constructed or modified <br />channels shall be designed and constructed to withstand the expected velocity of flow <br />from the planned post-development frequency storm without eroding. The planned <br />post-construction velocity and flow shall include the entire contributing watershed. <br /> <br />(n) Establishment of Permanent Vegetation: A permanent vegetative cover shall be <br />established on denuded areas not otherwise permanently stabilized. Permanent <br />vegetation shall not be considered established until ground cover is achieved which, in <br />the opinion of the City Engineer, has 70% vegetative density over the entire disturbed <br />area and provides adequate cover, and is mature enough to satisfactorily control soil <br />erosion and survive adverse weather conditions. <br /> <br />(0) Disposition of Temporary Practices: All temporary soil erosion and sediment <br />control practices shall be disposed of immediately after final site stabilization is achieved <br />or after the temporary practices are no longer needed, unless otherwise required by the <br />City Engineer. Trapped sediment shall be permanently stabilized to prevent further <br />erosion. The Construction Maintenance Guarantee shall not be released by the City of <br />Lakewood until all temporary soil erosion and sediment control practices that are no <br />longer needed have been removed, properly disposed of and any trapped sediment has <br />been stabilized. <br /> <br />(p) Underground Utility Construction: The construction of underground utility lines, <br />pipes, etc. shall be subject to the following criteria: <br /> <br />(1) Trenches shall remain open for no more than five days, unless approved <br />by the City Engineer. <br /> <br />(2) There shall be no turbid discharges to surface waters resulting from <br />dewatering àctivities. If trench or ground water contains sediment, it must <br />pass through a sediment settling pond or other equally effective sediment <br />control device, prior to being discharged from the construction site or to <br />waters of the state. <br /> <br />23 <br />