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KITTITAS COUNTY SOLID WASTE ON-CALL <br />CLE ELUM TRANSFER STATION FRONT ENTRANCE DESIGN <br />PW\JA\KITTCO02\ENTRANCE TEMPORARY EROSION AND <br />JUNE 2023 SEDIMENT CONTROL <br />©COPYRIGHT 2023 JACOBS 01 57 13 - 7 <br />3. Controlling underground water found during construction. <br />4. Covering or otherwise protecting slopes until permanent erosion control <br />measures are working. <br />F. To the degree possible, coordinate this temporary Work with permanent <br />drainage and erosion control work the Contract requires. <br />G. Site may require additional temporary control measures if it appears pollution <br />or erosion may result from weather, nature of materials, or progress on the <br />Work. <br />H. Install all sediment control devices including, but not limited to, sediment <br />ponds, perimeter silt fencing, or other sediment trapping BMPs prior to any <br />ground disturbing activity. Do not expose more erodible earth than necessary <br />during clearing, grubbing, excavation, borrow, or fill activities without written <br />approval by Engineer. Engineer may increase or decrease the limits based on <br />Project conditions. Erodible earth is defined as any surface where soils, <br />grindings, or other materials may be capable of being displaced and <br />transported by rain, wind, or surface water runoff. Cover inactive areas of <br />erodible earth, whether at final grade or not, within specified time period (see <br />[NPDES] Erosion and Sediment Control Permit), using an approved soil <br />covering practice. Phase clearing and grading to maximum extent practical to <br />prevent exposed inactive areas from becoming a source of erosion. <br />I.Water Management: <br />1. Manage site water in accordance with the conditions of the waste <br />discharge permit from a local permitting authority. If site water <br />management is not subject to permit, manage as follows: <br />a. When groundwater is encountered in an excavation, treat and <br />discharge as follows: <br />1) When groundwater conforms to applicable Water Quality <br />Standards, it may bypass detention and treatment facilities <br />and be routed directly to its normal discharge point at a rate <br />and method that will not cause erosion. <br />2) When turbidity of groundwater is similar to turbidity of site <br />runoff, groundwater may be treated using same detention <br />and treatment facilities being used to treat the site runoff <br />and then discharged at a rate that will not cause erosion. <br />3) When groundwater turbidity is greater than turbidity of site <br />runoff, treat ground water separately until turbidity is <br />similar to or better than site runoff, and then it may be <br />combined with site runoff and treated as described above.