308 EROSION AND SEDIMENT CONTROL

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308.01 DESCRIPTION
Install and maintain erosion and sediment control (ESC) measures throughout the life of the Contract to control erosion and to minimize the release of sediments into adjacent areas and nearby rivers, streams, lakes, reservoirs, bays, and coastal waters. Implement the approved ESC plan and approved modifications. Identify staging and stockpile areas, and apply ESC measures as approved.
308.01.01 Erosion and Sediment Control Manager (ESCM). Designate an Erosion and Sediment Control Manager (ESCM) to implement the ESC plan and to oversee the installation, maintenance, and inspection of the ESC measures.
308.01.02 Severe Weather Event. A severe weather event is defined as a weather event in which measured rainfall exceeds 3 in. in a continuous 24-hr period based upon rainfall data obtained from the nearest official National Weather Service (NWS) gauge station in proximity to the project site.
308.01.03 Quality Assurance (QA) Toolkit. The Quality Assurance (QA) Toolkit is a web-based system that contains project and permit information, a history of ESC inspection reports, and is used to submit, track and receive approvals for modifications to the ESC plans.
308.02 MATERIALS
Riprap       901.03
4 to 7 in. Stone       901.05
Asphalt Mixes       Section 904
Pipe       Section 905
Gabion Wire       Section 906
Steel Plate       909.02
Welding Material       909.03
Fence Fabric for Super Silt Fence       914.01.01
Geotextile, Woven and Non-Woven       919, Class E
Geotextile, Woven Slit Film       919, Class F
Soil Amendments       920.02
Compost       920.02.05
Fertilizer       920.03
Mulch       920.04
Soil Stabilization Matting       920.05
Seed and Turfgrass Sod       920.06
Straw Bales       921.08
2 in. to 3 in. Stone       M 43, No. 2
3/4 in. to 1-1/2 in. Stone       M 43, No. 4
No. 57 Stone       M 43, No. 57
308.02.01 Filter Log Casing. Produced from 5 mil thick continuous high-density polyethylene or polypropylene, woven into a tubular mesh netting material with openings in the knitted mesh of 1/8 in. to 3/8 in.
308.03 CONSTRUCTION
308.03.01 Preliminary. Prior to beginning any construction activity, complete the following.
(a) Attend a Pre-Construction Erosion and Sediment Control Meeting with the Engineer and the Regional Environmental Coordinator (REC) to discuss ESC schedule, responsibilities, and modification procedures.
(b) Submit the location of the nearest official National Weather Service (NWS) gauge station. Alternatively, a gauge station may be installed. Alternate gauge station proposals must be acceptable to and approved by the Engineer and the REC.
Include detailed information regarding the type, location, accuracy, methodology, and security of the rain gauge in the proposal for consideration.
(c) Demarcate all wetlands, wetland buffers, floodplains, waters of the United States (WUS), tree protection areas, and the Limit of Disturbance (LOD) as specified in Section 107. Ensure the demarcations are inspected and approved.
308.03.02 Contractor Responsibilities. Prior to beginning any earth disturbing activity, complete the following.
(a) Install ESC measures as specified in 308.03.03. Ensure that controls are inspected and approved.
(b) Ensure that all stormwater runoff from disturbed areas is directed to installed ESC measures.
(c) Do not remove and ESC measure without the approval from the Regional Environmental Coordinator (REC).
(d) Ensure that dewatering practices do not cause any visible changes to stream clarity.
308.03.03 Standards and Specifications. Construct and maintain in good working order all ESC measures as specified and in accordance with the latest versions of the following.
(a) Maryland Department of the Environment (MDE) ESC and Stormwater Management (SWM) regulations, including but not limited to the pertinent sections of the Annotated Code of Maryland and the Code of Maryland Regulations (COMAR).
(b) MDE “Maryland Standards and Specifications for Soil Erosion and Sediment Control.”
(c) MDE “Maryland Stormwater Design Manual, Volumes I and II.”
(d) (d) SHA Field Guide for Erosion and Sediment Control.
Keep a copy of the MDE “Maryland Standards and Specifications for Soil Erosion and Sediment Control” on the project site throughout the duration of the Contract.
308.03.04 Erosion and Sediment Control Plan (ESC Plan) and Sequence of Construction. Implement the approved ESC plan and Sequence of Construction. All changes to the approved ESC plan or Sequence of Construction require Administration approval. Submit modifications to the approved ESC plan and Sequence of Construction to the Administration using the QA Toolkit at least 14 days prior to the desired time to implement the change. Ensure that all changes are approved before implementing the change.
Submit modifications overlaid on approved plans. Ensure submittals are full-size, reasonably legible, clear, and easily understood; use the standard symbology and names of ESC measures in the Contract Documents; and follow the design requirements specified in 308.03.03 (a) through 308.03.03 (d).
When requested by the Administration, obtain the services of a Professional Engineer, licensed in the State of Maryland, to develop the ESC modification submittals.
308.03.05 Erosion and Sediment Control Manager. At least 10 days prior to beginning any work, assign and submit the name and credentials for approval an Erosion and Sediment Control Manager (ESCM). Ensure that the ESCM and the superintendent have successfully completed the MDE “Responsible Personnel Certification Training for Erosion and Sediment Control” and the Administration’s “Erosion and Sediment Control Certification Training for Contractors and Inspectors.” The certifications must be current for the entire duration of the Contract. If the certification expires or is revoked for either person, immediately replace the person with an appropriately qualified and certified person acceptable to the Administration. No work may proceed without the appropriate certified personnel in place. Any substitutes for the ESCM will be subject to approval. The Administration reserves the right to require a reassignment of the ESCM duties to another individual for any reason.
The ESCM is primarily responsible for and has the authority to implement the approved ESC plans, schedules, and methods of operation for both on-site and off-site activities. The ESCM’s duties and responsibilities include the following.
(a) Attendance at the Pre-Construction ESC Field Meeting and periodic field meetings to evaluate the effectiveness of measures already installed and to plan for the implementation of necessary controls proposed for succeeding areas of soil disturbance.
(b) Daily inspections of the ESC measures to ensure that all measures are always in place and to develop a list of activities and schedules to ensure compliance with the Contract Documents.
(c) Maintenance of a log of the daily inspections in 308.03.05 (b), including actions taken, and submit a written report at the end of each work day.
(d) With the Engineer, conduct post-storm inspections both during and beyond normal working hours and submitting a written report.
(e) Having the authority to mobilize crews to make immediate repairs to the ESC measures during working and non-working hours.
(f) When requested, accompanying the Engineer during REC inspections and inspections made by the regulating agencies.
(g) Coordinating with the Engineer to ensure that all deficiencies are immediately corrected and that the project always complies with the approved ESC plan.
308.03.06 Quality Assurance Ratings. The REC will routinely inspect the Project Site to ensure compliance with the approved Erosion and Sediment Control (ESC) and Stormwater Management (SWM) Plans. The REC will assign scores based on these inspections. The scores will be reported on Form No. OOC61/QA-1: Erosion/Sediment Control and Stormwater Management Field Investigation Report. The REC will use the scores to determine the following ratings.
Quality Assurance Ratings
SCORE RATING
≥ 90.0 A
80.0 - 89.9 B
70.0 - 79.9 C
60.0 - 69.9 D
< 60.0 F
(a) Rating A. The Project complies with the approved plan. Minor corrective actions may be necessary.
(b) Rating B. The Project generally complies with the approved plan; however, corrective action is necessary.
(c) Rating C. The Project generally complies with the approved plan; however, deficiencies noted require corrective action within 72 hours and shutdown conditions may arise quickly. The Project Site will be re-inspected within 72 hours and routine inspection frequency may increase.
(d) Rating D. The Project is in non-compliance. The Administration will shut down earthwork operations. Focus work efforts on correcting ESC deficiencies. The Project Site will be re-inspected within 72 hours. Complete all required corrective actions within the 72-hour period for the Project to be upgraded to a 'B' rating. Failure to upgrade the Project from a 'D' rating to a 'B' or better rating will result in the Project being rated an 'F'. Liquidated damages will be imposed for each day the Project has a 'D' rating and inspection frequency may increase.
(e) Rating F. The Project is in non-compliance. An ‘F’ rating indicates one or more of the following.
(1) A score of less than 60.
(2) Required permits and approvals have not been obtained.
(3) The approved LOD has been exceeded.
(4) Wetlands, wetland buffers, waters of the US (WUS), floodplains, and/or tree preservation areas have been encroached upon without prior necessary and adequate approval.
(5) The work is not proceeding according to the approved ESC plan, Sequence of Construction, and/or ESC schedule.
When a project is in non-compliance, the Administration will shut down the entire project until the project receives a ‘B’ or better rating. Focus all work efforts on correcting ESC deficiencies. Liquidated damages will be imposed for each day the Project has an ‘F’ rating and inspection frequency may increase.
308.03.07 Shutdowns. If a Project is rated 'C', correct all deficiencies within 72 hours. The Project Site will be re-inspected at the end of the 72-hour period. If the deficiencies have not been satisfactorily corrected, the Project will be rated 'D' and all earthwork operations will be shut down.
If consecutive 'C' ratings are received, expect notification that the overall effort appears marginal and that a shutdown of all earthwork operations is imminent if ESC efforts do not substantially improve within 72 hours. The Project Site will be re-inspected at the end of the 72-hour period. If the deficiencies are not satisfactorily corrected, or if other deficiencies are identified, and the Project receives less than a ‘B’ rating, a 'D' rating will be given and all earthwork operations will be shut down.
If the deficiencies are not corrected in 72 hours, an 'F' rating will be given, and the entire Project will be shut down. When degradation to a regulatorily protected resource, occurs or has already occurred, or if corrective measures remain uncompleted after the 72-hour period, the Administration may elect to have the corrective actions performed by another contractor or by Administration personnel.
The second time that a Project is rated 'F', the ESC Training Certificate issued by the Administration will be immediately revoked from the superintendent and the ESCM for at least six-months and until successful completion of the Administration’s Erosion and Sediment Control Certification Program. Immediately replace the superintendent and ESCM and focus all work efforts on correcting ESC deficiencies.
308.03.08 Severe Weather Event. Maintain, repair, or replace any damaged ESC measures within 72 hours of a severe weather event occurrence.
Refer to GP-7.12 for unforeseen conditions.
308.03.09 Pre-Construction Conference. Present a general overview at the Pre-Construction Conference of how ESC measures shall be implemented.
308.03.10 Initial Controls. Install all perimeter controls, such as silt fence, super silt fence, earth dikes, sediment traps, and sediment basins, prior to grubbing operations.
If it is determined that the clearing area has been disturbed and a potential for sediment runoff or erosion exists, install the controls at that time as directed.
308.03.11 Maintenance. Always maintain ESC measures throughout the life of the Contract, whether active or inactive. Maintain access to all ESC measures until they are removed.
Inspect ESC measures immediately after storm events. Clean out as necessary and repair or replace all damaged ESC measures as the first order of business after the storm event.
308.03.12 Stabilization Requirements. Following initial soil disturbance, complete permanent or temporary stabilization within the following.
(a) Three calendar days for the surface of all perimeter dikes, swales, ditches, perimeter slopes, and all slopes steeper than 3 horizontal to 1 vertical (3:1); and
(b) Seven calendar days as to all other disturbed or graded areas on the project site not under active grading.
(c) Areas between temporary berms, except median areas, need not be stabilized during incremental stabilization.:Sensitive areas may require less than three or seven day stabilization. Maintain as necessary to ensure continued stabilization.
(d) Sensitive areas may require less than three- or seven-day stabilization. Maintain as necessary to ensure continued stabilization.
(e) Track slopes within two days of establishment as specified in 701.03.
308.03.13 Waste Areas. From the appropriate authority and while coordinating with the Engineer, obtain approval for off-site waste areas not delineated in the Contract Documents. Protect waste areas and stockpile areas with ESC measures as specified in 308.03.12 (a) and (b).
308.03.14 MDE Inspections. Work is subject to field inspections by MDE. If non-compliance is determined, the MDE Water Management Administration (WMA) inspector will immediately notify the Engineer of needed corrective actions. Corrective actions may require a shutdown of construction activities until the non-compliance is satisfactorily corrected. Focus all efforts on correcting ESC deficiencies found during MDE inspections.
308.03.15 Stabilized Construction Entrance. Construct stabilized construction entrances (SCEs) as specified.
Rehabilitate SCEs with periodic top dressing using additional aggregate, replacing the drainage pipe beneath the SCE if one was installed, or making other repairs to the SCE and sediment trapping devices.
When necessary, place wash racks to prevent tracking of mud and sediment from disturbed areas onto roadways or other areas.
308.03.16 Side or Berm Ditches and Culverts. Construct side ditches in fill areas and berm ditches in cut areas. Construction includes the installation of lining. Protect linings from sediment deposits. Place silt fence along the banks of existing streams as specified prior to placing any culverts. To help avoid sedimentation during construction, divert the streams around the location of the culvert until the proposed culvert and channel are stabilized.
308.03.17 Erosion and Sediment Control Original Excavation. Excavate, construct embankments, grade, and backfill for sediment traps, sediment basins, and other ESC measures.
Ensure that excavation and embankments meet the dimensions for each ESC measure as specified. Stockpile excavated material and use for backfill when the ESC measures are removed.
308.03.18 Erosion and Sediment Control Cleanout Excavation. Remove accumulated sediment from ESC measures and other areas during routine maintenance of ESC measures and as directed.
Clean out sediment traps as necessary to ensure that at least 50 percent of the wet storage capacity is always available. Ensure that riprap outlet sediment traps have at least 75 percent of the wet storage capacity always available. Remove sediment from silt fence and super silt fence when sediment reaches 25 percent of the height of the fence and from stone check dams when sediment reaches 50 percent of the height of the dams. Remove sediment from stone outlet structures when sediment is within 6 in. of the weir crest.
Place removed sediment in an approved waste site. Material stored on-site may be reused once it is dried and if it meets embankment requirements unless otherwise specified.
308.03.19 Heavy Use Areas. Locate and size heavy use areas used for activities such as staging and storage. From the appropriate authority and while coordinating with the Engineer, obtain approval for off-site heavy use areas not delineated in the Contract Documents. Obtain any necessary permits or modifications for non-specified heavy use areas.
308.03.20 Stockpile Areas. Locate and size stockpile areas. From the appropriate authority and while coordinating with the Engineer, obtain approval for off-site stockpile areas not delineated in the Contract Documents. Obtain any necessary permits or modifications for non-specified stockpile areas.
308.03.21 Earth Dike. Do not use sod as stabilization unless specifically approved.
308.03.22 Temporary Swale. Do not use sod as stabilization unless specifically approved.
308.03.23 Perimeter Dike Swale. Do not use sod as stabilization unless specifically approved.
308.03.24 Pipe Slope Drain. When slope drains are placed on grade, construct interceptor berms to direct flow into the flared end section.
308.03.25 Stone Check Dam. Construct using Class 0 riprap.
308.03.26 Riprap Inflow Protection. Construct as specified in Section 312.
308.03.27 Gabion Inflow Protection. Construct as specified in Section 313.
308.03.28 Rock Outlet Protection. Construct as specified in Section 312.
308.03.29 Gabion Outlet Protection. Construct as specified in Section 313.
308.03.30 Plunge Pool. Construct as specified in Section 312.
308.03.31 Super Silt Fence. Construct as specified with the following exception:
Run a 7 gage top tension wire continuously between posts.
308.03.32 Filter Berms. Construct berms of wood chips and up to 50 percent Compost.
308.03.33 Filter Log. Use Compost for the filter media. Install Filter logs parallel to contours and perpendicular to sheet flow from disturbed areas.
Where a connection is needed, there are two options based on whether the filter log is being filled on-site or offsite. Overlap prefilled filter logs by 1-ft minimum and staked where they connect. Sleeve filter log casings that are filled onsite. After one filter log section is filled and tied off (knotted), pull the second filter log section over the first (2 ft) and “sleeve,” creating an overlap.
Remove sediment when it has accumulated to a depth of half the exposed height of the filter log. Replace the filter log if torn or damaged. Reinstall the filter log if undermining or dislodging occurs.
Drive stakes perpendicular to water flow at a maximum of 8 ft intervals. Restrict vehicular and construction traffic from crossing filter logs.
Upon stabilization of the drainage area to the filter log and with approval, remove stakes. The filter log may be left in place and vegetated, or removed. In the former case, cut the filter log casing open, remove all non-biodegradable material, spread the compost as a soil supplement, and seed as specified.
308.03.34 Filter Bag. Determine the bag dimensions necessary to provide the required storage volume, determine pump and hose sizes, and install.
308.03.35 Straw Bales. Embed the bales to a depth of at least 4 in., and anchor in place with two No. 4 reinforcement bars, steel pickets, or 2 in. x 2 in. wood stakes, 36 in. length. Locate the anchoring devices at approximate third points along the longitudinal center line of each bale, driven through the bale and into the ground to a depth of 12 in. to 18 in.
308.03.36 Stone Outlet Structure. Stabilize the area immediately after removal of the structure.
308.03.37 Temporary Gabion Outlet Structure. As specified in Section 313. Grade and stabilize the area beneath the structure, immediately upon removal.
308.03.38 Portable Sediment Tank. Determine the dimensions necessary to provide the required storage volume.
308.03.39 Dewatering. Dewater only when conditions allow. Ensure that dewatering activities do not cause any visible change to stream clarity. If a sediment plume is visible, immediately cease the dewatering activity. Direct any pumping activity, including dewatering sediment traps and basins, through an approved dewatering device.
308.03.40 Sediment Traps. Excavate sediment traps to the specified length, width, and depth.
At locations where filtration facilities are specified, prevent runoff from adjacent unstabilized areas from entering the locations. Ensure that bottom elevations of sediment control devices are at least 2 ft higher than the finished grade bottom elevation. When converting a sediment trap to a permanent stormwater facility, remove and dispose of all accumulated sediment prior to final grading.
When grading and paving operations are complete and vegetation is established on the slopes and channels to the satisfaction of the Engineer, refill the sediment traps with suitable materials, shape, and permanently stabilize as specified.
308.03.41 Stone for Sediment Control. Place No. 57 stone, 3/4 in. to 1-1/2 in. stone, 2 in. to 3 in. stone, 4 in. to 7 in. stone, and riprap as specified.
308.03.42 Maintenance of Stream Flow. Maintain the continuous flow of waterways during operations as specified or directed.
(a) Implement the approved ESC plan. Any changes to the approved ESC plan require approval from the appropriate regulatory authorities.
(b) A different plan for maintenance of stream flow may be submitted, but approval from the Engineer and the appropriate approval authority is required.
(c) If the stream diversion system as shown is not capable of blocking the flow of water through the soil beneath the system, design and provide an effective means of diverting the water away from the designated areas.
(d) Ensure that all excavation performed within the diverted stream is performed in a dewatered condition, which may require additional pumps, sheeting, shoring, cofferdams, etc.
(e) If the proposed system does not perform satisfactorily or additional material and equipment is required to dewater the site and excavated areas, adjust the stream diversion system and obtain approvals from the appropriate approving authorities.
(f) Securely anchor the stream diversion system in place to prevent movement during high water events. Submit the proposed method of anchoring for approval. Do not install anchors beyond the limits of disturbance or infringe on the channel area available for stream flow.
(g) Upon completion of construction and when temporary drainage devices are no longer necessary, with the approval of the REC and the Engineer, remove and dispose of the devices in an acceptable manner.
308.03.43 Sandbags. Furnish and install sandbags to contain or divert water and sediment as specified and as directed.
308.03.44 Removal of Controls. Do not remove ESC measures until all previously disturbed areas are vegetated with at least a 3-in. growth of grass, and removal of the ESC measures is approved by the REC and the Engineer. Immediately stabilize those areas where ESC measures are removed as specified and as directed.
308.04 MEASUREMENT AND PAYMENT
The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work. The maintenance, repair, removal and resetting, and final removal of ESC measures will not be measured, but the cost will be incidental to the Contract price to construct the device unless otherwise specified.
308.04.01 ESCM will not be measured but the cost will be incidental to ESC items.
308.04.02 Implementation of the ESC Plan will not be measured but the cost will be incidental to the Erosion and Sediment Control items.
308.04.03 No claims against the Administration will be considered due to a shutdown of the grading operations or the entire project. When corrective actions are performed by another contractor or by the Administration, all costs associated with the work will be billed to the original Contractor.
308.04.04 When specified, a project may include incentive payments. Starting at the Notice to Proceed, an Incentive Payment will be made for a rating quarter consisting of 3 months when at least four inspections were performed by the REC and an average score equal to or greater than 85.0 for the entire rating quarter is received. The quarterly incentive payment will be made within 60 days after the end of the rating quarter. No incentive will be paid for partial quarters or for quarters with less than four inspections. No incentives will be paid for any quarter in which a 'D' or 'F' rating is received. When a project receives no 'D' or ‘F’ ratings and the overall average score is equal to or greater than 85.0, the final incentive payment will be made at final project closeout. If a time extension is granted, additional quarterly incentive payments will be drawn from the final incentive payment.
308.04.05 Whenever a project is rated 'D' or 'F', the Liquidated Damages will be assessed. Liquidated Damages must be paid within 30 days from the date of notification.
308.04.06 Incentive Payments and Liquidated Damages. The Contract Documents will specify the amounts of incentive payments and liquidated damages that apply if applicable.
308.04.07 Replacement of ESC measures that are damaged and replaced as a result of a Severe Weather Event will be measured and paid for at the Contract unit prices provided that a Quality Assurance Rating of “B” or better was obtained in the previous rating. Restabilization of damaged areas will be measured and paid for at the Contract unit prices. Other damages as a result of an event are subject to TC-7.03.
308.04.08 Stabilized Construction Entrance will be measured and paid for per each and includes all excavation, geotextile, aggregate, pipe, rehabilitation, relocation and incidentals to complete the work.
308.04.09 Wash Racks for Stabilized Construction Entrance will be measured and paid for per each and includes racks, excavation, wash water and incidentals to complete the work.
308.04.10 Erosion and Sediment Control Original Excavation will be measured and paid for at the Contract unit price per cubic yard. The payment will include excavation, backfill, grading and disposal.
308.04.11 Erosion and Sediment Control Cleanout Excavation will be measured and paid for at the Contract unit price per cubic yard. The payment will also include excavation and disposal.
308.04.12 Temporary Mulch will be measured and paid for as specified in 704.04.01.
308.04.13 Temporary Seed will be measured and paid for as specified in 704.04.02.
308.04.14 Turfgrass Sod will be measured and paid for as specified in 708.04.01.
308.04.15 Soil Stabilization Matting will be measured and paid for as specified in 709.04.
308.04.16 Temporary earth berms and interceptor berms for incremental stabilization will not be measured, but the cost will be incidental to the excavation items specified in the Contract Documents.
308.04.17 Heavy use areas will not be measured but will be incidental to the pertinent items.
308.04.18 Stockpile areas will not be measured but will be incidental to the pertinent items.
308.04.19 Earth Dikes will be measured and paid for at the Contract unit price per linear foot. 4 to 7 in. stone, temporary seeding, and soil stabilization will be measured and paid for as specified in 308.04.60, 704.04, and 709.04, respectively.
308.04.20 Temporary Swales will be measured and paid for at the Contract unit price per linear foot. 4 to 7 in. stone, temporary seeding, and soil stabilization matting will be measured and paid for as specified in 308.04.60, 704.04, and 709.04, respectively.
308.04.21 Perimeter Dike/Swales will be measured and paid for at the Contract unit price per linear foot. Temporary seeding and soil stabilization matting will be measured and paid for as specified in 704.04 and 709.04, respectively.
308.04.22 Temporary storm drain diversions will be measured and paid for at the Contract unit price per linear foot of the size specified and will include all grading, pipe, connections and any incidentals necessary to complete the work.
308.04.23 Temporary Asphalt Berm will be measured and paid for at the Contract unit price per linear foot. The removal of the temporary asphalt berm will not be measured but the cost will be incidental to the Contract price.
308.04.24 Clear Water Diversions will be measured and paid for at the Contract unit price per linear foot of the size specified and will include all pipe, connections, anchors, sandbags, sheeting, dewatering and any incidentals necessary to complete the work.
308.04.25 Temporary Barrier Diversions will be measured and paid for at the Contract unit price per linear foot and will include all barrier, sandbags, sheeting, dewatering and any incidentals necessary to complete the work.
308.04.26 Mountable Berms will be measured and paid for at the Contract unit price per each and will include all earthwork, stone, geotextile, and any incidentals necessary to complete the work.
308.04.27 Diversion Fence will be measured and paid for at the Contract unit price per linear foot.
308.04.28 Pipe Slope Drain will be measured and paid for at the Contract unit price per linear foot. The payment will also include excavation, backfill, flared end section, geotextile, anchors, coupling bands, and pipe elbows.
308.04.29 Stone Check Dam will be measured and paid for as specified in 308.04.60.
308.04.30 Riprap Inflow Protection will be measured and paid for as specified in 308.04.60.
308.04.31 Gabion Inflow Protection will be measured and paid for as specified in 313.04.
308.04.32 Rock Outlet Protection will be measured and paid for at the Contract unit price per square yard of Riprap Slope and Channel Protection.
308.04.33 Plunge Pool will be measured and paid for at the Contract unit price per square yard of Riprap Slope and Channel Protection.
308.04.34 Silt Fence will be measured and paid for at the Contract unit price per linear foot.
308.04.35 Silt Fence on Pavement will be measured and paid for at the Contract unit price per linear foot of Silt Fence.
308.04.36 Super Silt Fence will be measured and paid for at the Contract unit price per linear foot.
308.04.37 Clear water pipes through silt fence or super silt fence will not be measured but will be incidental to the pipe and silt fence items.
308.04.38 Filter Berms will be measured and paid for at the Contract unit price per linear foot.
308.04.39 Filter Logs will be measured and paid for at the Contract unit price per linear foot for the size specified.
308.04.40 Temporary Stone Outlet Structures will be measured and paid for as specified in 308.04.60. The baffle board and stakes will not be measured but the cost will be incidental to the Contract price.
308.04.41 Temporary Gabion Outlet Structures will be measured and paid for at the Contract unit price per each.
308.04.42 Standard Inlet Protection will be measured and paid for at the Contract unit price per each for Inlet Protection.
308.04.43 At Grade Inlet Protection will be measured and paid for at the Contract unit price per each for Inlet Protection.
308.04.44 Curb Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection.
308.04.45 Median Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection.
308.04.46 Median Sump Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection.
308.04.47 Combination Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection.
308.04.48 Gabion Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection.
308.04.49 Catch Basin Insert will be measured and paid for at the Contract unit price per each for Inlet Protection.
308.04.50 Removable Pumping Station will be measured and paid for at the Contract unit price per each. The payment will also include excavation, pipe, geotextile, wire mesh, steel plate, hose, pump, and connections.
Stone will be measured and paid for as specified in 308.04.60.
308.04.51 Sump Pit will be measured and paid for at the Contract unit price per each. The payment will also include excavation, pipe, geotextile, wire mesh, steel plate, hose, pump, and connections.
Stone will be measured and paid for as specified in 308.04.60.
308.04.52 Portable Sediment Tank will be measured and paid for at the Contract unit price per each. The payment will also include pipe, geotextile, wire mesh, steel plate, hose, pump, and connections. No adjustments will be made for resizing or relocating portable sediment tanks to meet stream clarity discharge requirements.
308.04.53 Filter Bags will be measured and paid for at the Contract unit price per each and will include pump, hoses, connections, straw bales, sizing, locating, relocating, disposal and any other incidentals necessary. No adjustments will be made for resizing or relocating to meet Permit conditions or turbidity requirements.
308.04.54 Sediment traps will be measured and paid for at the Contract unit price for one or more of the items listed below:
(a) Erosion and Sediment Control Original Excavation as specified in 308.04.10.
(b) Pipe as specified in 303.04.
(c) Stone as specified in 308.04.60.
(d) Inflow protection as specified in 308.04.30 and 308.04.31
(e) Baffle board and stakes will not be measured but the cost will be incidental to the other items.
(f) Temporary risers will be measured and paid for at the Contract unit price per each.
(g) Anti-seep collars will be measured and paid for at the Contract unit price per each.
(h) Geotextile will not be measured but the cost will be incidental to the stone.
308.04.55 Sediment Basins will be measured and paid for at the Contract unit price for one or more of the following items:
(a) Earthwork as specified in 308.04.10.
(b) Pipe as specified in 303.04.
(c) Stone as specified in 308.04.60.
(d) Baffle board and stakes will not be measured but the cost will be incidental to the other items.
(e) Temporary risers will be measured and paid for at the Contract unit price per each and include trash racks, draw down devices, concrete bases, projection collars, riser connectors and any other incidentals.
(f) Modifying Stormwater Management Riser Structures and installing dewatering pipe systems will be measured and paid for at the Contract unit price per each for Convert Stormwater Management Riser for Sediment Control. Converting the risers back to their permanent state will be incidental to pipe.
(g) Anti-seep collars will be measured and paid for at the Contract unit price per each.
(h) Geotextile will not be measured but the cost will be incidental to the stone.
308.04.56 Temporary Access Bridge will be measured and paid for at the Contract Lump Sum price.
308.04.57 Temporary Access Culvert will be measured and paid for at the Contract unit price per linear foot.
308.04.58 Onsite concrete washout structures will not be measured but will be incidental to the various concrete mixes.
308.04.59 Restabilization will not be measured when permanently stabilized areas are disturbed by grading operations or other activities not specifically approved.
308.04.60 Stone for sediment control will be measured and paid for at the Contract unit price per ton for the pertinent Stone for Sediment Control item. Geotextile, excavation, and backfill will not be measured but the cost will be incidental to the Contract price.
308.04.61 Straw bales will not be measured but the cost will be incidental to the pertinent items with which they are used.
308.04.62 Maintenance of Stream Flow will not be measured but will be paid for at the Contract lump sum price. The payment includes design, redesign providing diversion structures regardless of the type required to satisfactorily divert the stream flow, anchoring of the system, excavation, backfill, dewatering the site and excavation within the stream diversion area, maintenance of the diversion system, sandbags, polyethylene sheeting, diversion pipes, pumps, hoses, connections, portable sediment tanks and obtaining any necessary permits. Payment will not be adjusted for alternative stream diversion systems regardless of any changes in quantities from that shown in the Contract Documents. The provisions of GP-4.05 will not apply to this work.
Cleanup and restoration of the stream diversion area that is damaged and replaced as a result of a Severe Weather Event will not be measured but paid for as specified in TC-7.03.
308.04.63 When sandbags are specified for use other than when incidental to 308.04.24, 308.04.25, 308.04.62, or otherwise specified as incidental, sandbags will be measured and paid for per cubic yard.