CATEGORY 300 DRAINAGE SECTION 308 — EROSION AND SEDIMENT CONTROL
308.01 Description
Install and maintain erosion and sediment control (ESC) measures and best practices throughout the duration of the Contract as specified in the Contract Documents, regulations, associated regulatory approvals, and associated regulatory permits.
308.01.01 ESC Approved Plans. The portion of the Contract Documents consisting of the ESC
plans bearing the pertinent regulatory approvals from the Administration’s Plan Review Division (PRD), the Anne Arundel Soil Conservation District (AASCD; applies to the Severn River Watershed area only), and inclusive of all approved revisions and modifications thereto.
308.01.02 Training, Certifications, and Accounts. The Erosion and Sediment Control Manager
(ESCM) and the Superintendent shall have valid certification of successful completion of the Maryland Department of the Environment ( 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 ESCM and the Superintendent shall hold valid certifications throughout the duration of the Contract. The ESCM and the Superintendent shall maintain active accounts in the Quality Assurance (QA) Toolkit, as specified in 308.01.06, throughout the duration of the Contract.
308.01.03 Conformance Requirements. In addition to the Contract Documents, conform with
the latest applicable regulations, regulatory approvals, regulatory permits, installation details, and other documents, including but not limited to, the following.
a.Annotated Code of Maryland and the Code of Maryland Regulations (COMAR) 26.17.01 (Erosion and Sediment Control), 26.17.02 (Stormwater Management), 26.17.04 (Construction on Nontidal Waters and Floodplains), and
26.17.06 (Water Appropriation or Use).
b.Title 9 of the Environment Article, Annotated Code of Maryland and COMAR 26.08.04.
c.The provisions of the Federal Clean Water Act (CWA), 33 U.S.C. §1251 et seq., as amended by the Water Quality Act of 1987, and its implementing regulations at 40 Code of Federal Regulations (CFR) Parts 122, 123, 124, 125 and 127.
d.23 CFR §I.G. Part 650 Subpart B. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
e.23 U.S.C. 109 Standards (2020) Subsection (g).
f.40 CFR Part 110, 40 CFR Part 117, and 40 CFR Part 302. (g) 40 CFR part 112 and Section 311 of the CWA. (h) 40 CFR 122.26(a)(1)(v) or 40 CFR 122.26(b)(15)(ii). (i) 40 CFR 122.26(b)(14)(x) or 122.26(b)(15)(i). (j) 40 CFR 122.44(i)(1)(iv). (k) 40 CFR 144 -147. (l) General Permit for Stormwater Discharge Associated with Construction Activity General National Pollutant Discharge Elimination System (NPDES) Permit Number MDRC0000 State Discharge Permit Number 20CP0000 and all updates and revisions thereto.
m.ESC Handbook, which refers to the handbook codified in COMAR 26.17.01 titled “2011 Maryland Standards and Specifications for Soil Erosion and Sediment Control”, or its successor.
n.MDE “2000 Maryland Stormwater Design Manual,” Volumes I and II or its successor.
o.MDOT SHA “Field Guide for Erosion and Sediment Control” and all updates and revisions thereto.
p.MDE Waterway Construction Guidelines.
308.01.04 Erosion and Sediment Control Manager (ESCM). The ESCM is responsible for the
implementation of the ESC measures and methods of operations, including but not limited to the implementation of corrective actions. The ESCM shall have the authority to implement ESC, schedules, and methods of operation for both on-site and off-site activities. When the Contract Documents indicate a limit of disturbance (LOD) greater than or equal to 1 acre, the ESCM shall also be a member of the Stormwater Team as specified in 308.01.07. ESCM duties include the following.
a.Attend the pre-construction meeting. (b) Attend the initial ESC field meeting and periodic field meetings to evaluate the effectiveness of ESC measures installed and to plan for the implementation of additional measures for subsequent areas of soil disturbance, which includes developing a list of activities and schedules to ensure compliance with the Contract 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS Documents and conformance requirements as specified. Must be on site at a frequency and duration to ensure compliance and as specified in 308.03.03.
c.Perform daily inspections of the installed ESC measures and ensure they are always in place and functioning.
d.Maintain a daily log of the ESC inspections that includes documenting steps taken for corrective actions, and submit a daily written report to the Engineer at the end of each calendar day.
e.Conduct inspections after a storm event of 0.25 inches and greater, within 24 hours, either the same day the rainfall event concludes or the next day, concurrently with the Engineer, submitting a written report documenting observations and corrective actions, to the Engineer.
f.Authorize mobilization of crews 24 hours a day each calendar day to make immediate repairs and implement corrective actions to ESC measures. Coordinate with the Engineer and the Regional Environmental Coordinator (REC) to ensure that all deficiencies are immediately corrected, and that Contract remains in compliance.
g.When requested, accompany the Engineer and REC during compliance inspections and inspections made by regulatory agency personnel.
h.Ensure prohibited discharges per 308.01.03(l) are not released and measures are in place to prevent prohibited discharges from occurring.
i.Ensure dewatering activity and turbidity monitoring is performed, recorded, documented, and ensure documentation includes corrective actions taken.
308.01.05 Severe Weather Event. A weather event in which measured rainfall exceeds 3 in. in a
continuous 24 hour period based upon rainfall data obtained from the nearest official National Weather Service (NWS) gauge station in proximity to the specific location of construction activities or from a gauge used on the project site as specified in 308.03.02 (c), or as otherwise determined by the Administration.
308.01.06 Quality Assurance (QA) Toolkit. A web-based system that contains Contract and
permit information, ESC inspection reports, stormwater management (SWM) facility as-built certification package submittals and tracking and may be used to submit requests for field modifications to the ESC Approved Plans, as well as track the status thereof, as instructed by the Administration’s “Quality Assurance Toolkit Construction Field Manual.” (https://apps.roads.maryland.gov/epd.qatoolkit/frmLogin.aspx)
308.01.07 Stormwater Team. When the Contract Documents indicate an LOD greater than or
equal to 1 acre, the Administration will establish a stormwater team. The stormwater team is not involved with permanent stormwater management (SWM) facilities in any way and is instead a team focused on ESC and pollution prevention during construction activities. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS The stormwater team includes personnel who are responsible for the following.
a.Compliance with the installation, maintenance, and repair of ESC measures and pollution prevention.
b.Conducting inspections as specified.
c.Taking corrective actions. The stormwater team shall have sufficient knowledge of requirements associated with the installation, maintenance, and removal of ESC measures, stabilization, locations of ESC measures and how they are to be maintained, procedures to follow, and when and how to conduct inspections, record applicable findings, and take corrective actions. The stormwater team shall have ready and easy access to the specified documents and reports.
308.02 Materials
Riprap Stone for Channels and Ditches Stone for Slopes Stone for Gabion 4 in. to 7 in. Stone Asphalt Mixes Pipe Gabion Wire Steel Plate Welding Material Fence Fabric for Super Silt Fence Geotextile, Woven and Non-Woven Geotextile, Woven Slit Film Soil Amendments Compost Fertilizer Mulch Soil Stabilization Matting Seed and Turfgrass Sod Straw Bales 2 in. to 3 in. Stone 3/4 in.to 1-1/2 in. Stone No. 57 Stone 901.02.01 901.03 901.04 901.05 901.05 Section 904 Section 905 Section 906 909.02 909.03
914.01 01
919.01, Class E 919.01, Class F 920.02
920.02.05 , Type C
920.03 920.04 920.05 920.06 921.08 M 43, No. 2 M 43, No. 4 M 43, No. 57
308.02.01 Filter Log Casing. Produced from 5 mils 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. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.02.02 Metal Posts for Super Silt Fence. Galvanized steel or aluminum posts having 2-3/8 in.
diameters and are 84 in. long.
308.03 Construction
308.03.01 Preliminary Activities. Prior to beginning construction activities, complete the
following.
a.Attend the Pre-Construction Meeting and present a general overview of how ESC measures shall be implemented for the Contract.
b.Assign an Erosion and Sediment Control Manager (ESCM) and submit to the Engineer the name and credentials of the ESCM for approval. The ESCM shall hold valid certifications as specified in 308.01.02.
308.03.02 Erosion and Sediment Control (ESC) Preparation. Prior to establishing staging
(heavy use) areas or stockpile areas, and prior to beginning grading and other earth disturbing activities, complete the following.
a.Attend the Initial ESC Meeting with the Engineer and the Regional Environmental Coordinator (REC) to discuss, at a minimum, ESC for the project, responsibilities, corrective action procedures, and modification procedures. When the Contract Documents indicate an LOD greater than or equal to 1 acre, the meeting shall include an invitation to a representative from the Maryland Department of the Environment’s (MDE’s) Compliance Program (MDE Compliance Inspector and the establishment of the Stormwater Team.)
b.When the Contract Documents indicate an LOD greater than or equal to 1 acre, post at a safe, publicly accessible location in proximity to the construction area(s), a notice of National Pollutant Discharge Elimination System (NPDES) permit coverage for stormwater discharges associated with construction activities. Locate the notice such that it is visible from the public right of way that is nearest to the construction activities. (For linear work zones that extend over several miles and for which a posting may be insufficient to provide notice of permit coverage, submit proposed alternatives of notification to the Engineer, who will coordinate with the REC and the MDE Compliance Inspector for approval.) The notice shall include the following, be accessible to the public, and be a minimum of 24 in. by 36 in.
1.The Contract Number and project name as listed on the permit.
2.The permittee as MDOT SHA. (3) The words “General Permit for Stormwater Associated with Construction 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS Activity” and the permit authorization number.
c.Submit, to the Engineer and REC for acceptance and approval, the location of the nearest official National Weather Service (NWS) gauge station or submit a proposal to install a gauge station for the specific location(s) of work. Proposals shall include detailed information regarding the type, location, accuracy, methodology, and security of the rain gauge. The rain gauge shall meet NWS large 20 in. gauge standards and have a measuring stick, overflow can, collector funnel, and an inner measuring tube that holds 2 in. of precipitation. The rain gauge shall use aluminum supports and be installed to where the bottom of the gauge is approximately 10 in. to 15 in. above the ground.
d.Demarcate all wetlands, wetland buffers, 100-year floodplains, waters of the United States (WUS), tree protection areas, stream protection zones (SPZs), special protection areas, and LOD as specified in Section 107. Ensure the demarcations are inspected and accepted by the Engineer.
308.03.03 ESCM and Superintendent. Do not commence work without an approved ESCM and
a Superintendent meeting the certification requirements as specified in 308.01.02. (The Contractor may elect to have the Superintendent serve as the ESCM.) Do not perform excavation, grading, or dewatering activities without the presence of the ESCM. When excavation, grading, or dewatering activities require an alternate ESCM, submit to the Engineer for approval the name and credentials of an alternate ESCM meeting the certifications as specified in 308.01.02. Inform the Engineer when the alternate ESCM will be responsible. If the certifications for the ESCM expire or are revoked, cease construction activities and immediately submit to the Engineer for approval the name and credentials of a new ESCM meeting the certifications as specified in 308.01.02. Resume construction activities when directed by the Engineer. The Administration reserves the right to require reassignment of the ESCM duties to another individual at any time with detailed justification. If the certifications for the Superintendent expire or are revoked, cease construction activities and immediately replace the Superintendent with another meeting the requirements as specified in 308.01.02. Resume construction activities when directed by the Engineer. Proactively prevent deficiencies. Promptly resolve deficiencies identified by the Regional Environmental Coordinator (REC) and maintain compliant quality assurance ratings. Refer to 308.03.07.
308.03.04 Off-Site Waste Areas. Obtain approvals and permits from the appropriate
jurisdictional authority for off-site waste areas that are not included in the Contract Documents and coordinate with the Engineer. Provide a copy of the approvals and permits to the Engineer, 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS who will place in the Contract records. Investigation Report. The REC will use the scores to determine the following ratings. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.03.05 MDE Inspections. All areas associated within the Contract are subject to routine,
periodic, scheduled, unscheduled, and random field inspections by one or more MDE Compliance Inspectors. If non-compliance is found, the MDE Compliance Inspector will immediately notify the Engineer and require corrective actions. The non-compliance and/or corrective actions may require a shutdown of construction activities until the non-compliance is satisfactorily resolved.
308.03.06 Field Modifications. Alternatives or variations to the ESC Approved Plans, including
but not limited to changes to the ESC sequence of construction, location and placement of ESC measures, type of ESC measures, additional or redundant ESC measures, location of staging (heavy use) areas within the LOD, and location of stockpiles within the LOD, may be submitted, at the option of the Contractor, to the Administration for approval. Such alternatives are known as ESC field modifications. Submit modification requests to the Administration using the Quality Assurance (QA) Toolkit at least 14 days prior to the desired time to implement the change. When an ESC field modification request changes the LOD for projects in which the LOD is greater than or equal to 1 acre, submit modification requests at least 30 days prior to the desired time to implement the change. Requests to change the total LOD for projects in which the total LOD is less than 1 acre but will equal or exceed 1 acre as a result of the ESC field modification are unacceptable. Submit ESC field modifications overlaid on the pertinent ESC Approved Plans. Ensure requested ESC field modifications to the ESC Approved Plans are submitted in PDF format, that changes are blue in color, and are overlayed on the pertinent full-size ESC Approved Plans, typically 36 in. x 24 in. in size. Ensure the ESC field modifications adhere to the standard symbology and names of ESC measures used in the Contract Documents and conform to 308.01.03. Ensure the request is legible, clear, and easily understood. The Administration reserves the right to require ESC field modifications to be prepared, stamped, and sealed by a Professional Engineer, licensed in the State of Maryland. Do not implement ESC field modifications until they have been approved via the QA Toolkit; however, if MDE or another regulatory authority directs ESC field modifications, or if the Engineer determines a modification is needed to prevent discharges, immediately implement the direction and follow up with a submission in the QA Toolkit.
308.03.07 Quality Assurance Ratings. The REC will routinely inspect the project to ensure
compliance with the Contract Documents with regards to ESC and Stormwater Management (SWM). 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 QUALITY ASSURANCE RATING TABLE 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. A project complies. Corrections to deficiencies may be necessary.
b.Rating B. A project generally complies. Corrections to deficiencies are necessary. (c) Rating C. A project marginally complies. Corrections to deficiencies are necessary. Shutdown conditions may arise quickly. The REC will reinspect within 72 hours. If the deficiencies have not been satisfactorily corrected, a ‘D’ rating will be issued. Inspection frequency may increase. If a consecutive ‘C’ rating is issued, the REC will reinspect after 72 hours. Failure to achieve a ‘B’ or better rating will result in a ‘D’ rating.
d.Rating D. A project is in non-compliance. Corrections to deficiencies are necessary. The Administration will shut down earthwork operations and will impose liquidated damages for each day of a ‘D’ rating. The REC will reinspect within 72 hours. Inspection frequency may increase. Failure to achieve a ‘B’ or better rating will result in an ‘F’ rating and the entire project will be shutdown. Liquidated damages will be imposed for each day of a ‘F’ rating. Inspection frequency may increase.
e.Rating F. A project is in non-compliance. Corrections to deficiencies are necessary. 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 or have expired. (3) The approved LOD has been exceeded. (4) Sensitive areas as specified have been encroached upon without prior necessary and adequate approval.
5.The work is not proceeding in conformance with the Contract Documents. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS The Administration will shut down earthwork operations until all deficiencies are satisfactorily corrected and ’B’ or better rating is achieved. The Administration will impose liquidated damages for each day of a 'F' rating. Inspection frequency may increase. Following an initial ‘F’ rating, subsequent ‘F’ ratings will result in the following until a ‘B’ rating or better is achieved. (i.) The Administration will shut down the entire project. (ii.) The ESC Training Certificate (Yellow Card) issued by the Administration will be immediately revoked from the Superintendent, and the ESCM responsible at the time of the subsequent rating, for no less than six-months and during which time access to the QA Toolkit will be restricted, after which time the individual may be eligible to take the Administration’s “Erosion and Sediment Control Certification Training for Contractors and Inspectors” (Yellow Card) again. Upon meeting 308.01.02, they may resume their former roles on the project. (iii.) If degradation to a sensitive area, protected resource, or Waters of the State occurs or has already occurred, or if corrective actions have not been taken, the Administration may elect to have corrective actions performed by another contractor or by Administration personnel.
308.03.08 Severe Weather Event. Maintain, repair, remove and reset, or replace damaged or
dysfunctional ESC measures, and install missing ESC measures, beginning within 24 hours following a severe weather event, and as safe conditions prevail as determined by the Engineer.
308.03.09 Prohibited Discharges. Prevent the release of prohibited discharges throughout the
duration of the Contract. 308.03.10 Stabilization Requirements. Following initial soil disturbance, complete temporary or permanent stabilization as specified. 308.03.11 Stabilized Construction Entrance (SCE). Construct stabilized construction entrances (SCEs) as specified. Rehabilitate SCEs with periodic top dressing using additional aggregate, replacing the drainage pipe beneath the SCE when one is installed, or making other repairs to the SCE and sediment trapping devices. When necessary and as directed, place wash racks to prevent tracking of mud and sediment. 308.03.12 Side or Berm Ditches and Culverts. Construct side ditches in fill areas and berm ditches in cut areas. Protect linings from sediment deposits. Place silt fence along the banks of existing streams as specified prior to placing culverts. To help avoid sedimentation during construction, divert the streams around the location of the culvert until the proposed culvert and channel are stabilized as specified. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.03.13 Erosion and Sediment Control Original Excavation. Excavate, construct
embankments, grade, and backfill for sediment traps, sediment basins, and other pertinent ESC measures.
308.03.14 Erosion and Sediment Control Cleanout Excavation. Remove accumulated
sediment from ESC measures and other areas during routine inspection and maintenance of ESC measures when necessary and as directed, per the ESC Handbook. Dispose of removed sediment as excess or unsuitable material. Alternatively, removed sediment may be reused once it is dried and if it meets embankment requirements unless otherwise specified.
308.03.15 Heavy Use Areas. Heavy use areas may be used for staging and for storage of
equipment and non-erodible materials. Locate heavy use areas using optional areas that may be identified for use in the Contract Documents. For locations within the approved LOD, these areas may not be shared with other entities not directly performing work on the Contract. Alternatively, obtain property owner permission and appropriate regulatory approvals and permits for off-site locations from the appropriate jurisdictional authority(ies) and coordinate with the Engineer. Provide copies of documented permission, approvals, and permits to the REC and Engineer, who will keep copies of the documents with the Contract records. Do not allow approvals and permits to expire for the duration of the Contract or as long as the location(s) is (are) needed.
308.03.16 Stockpile Areas. Stockpile areas may be used for the storage of erodible materials,
including but not limited to sand and soils. Locate stockpile areas using the optional areas that may be identified for use in the Contract Documents. For locations within the approved LOD, these areas may not be shared with other entities not directly performing work on the Contract. Alternatively, obtain property owner permission and appropriate regulatory approvals and permits for off-site locations from the appropriate jurisdictional authority(ies) and while coordinating with the Engineer. Provide copies of documented permission, approvals, and permits to the REC and the Engineer who will keep copies of the documents with the Contract records. Do not allow approvals and permits to expire for the duration of the Contract or as long as the location(s) is (are) needed.
308.03.17 Onsite Concrete Washout Structures. Locate onsite concrete washout structures and
cleanout activities as far away as practical from sensitive areas, Waters of the State, stormwater inlets, and stormwater conveyances. Direct wash water into an approved leak-proof container or leak-proof and lined pit designed so that no overflows occur due to inadequate sizing or precipitation. Do not dump washout or cleanout wastes, solid and liquid, in storm sewers or Waters of the State. Dispose of at an approved facility.
308.03.18 Earth Dike (ED). Do not use sod as vegetative stabilization unless directed.
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.03.19 Temporary Swale (TS). Do not use sod as vegetative stabilization unless directed.
308.03.20 Perimeter Dike/Swale. Do not use sod as vegetative stabilization unless directed. 308.03.21 Pipe Slope Drain. When slope drain is placed on grade, construct interceptor berms to
direct flow into the flared end section. 308.03.22 Riprap Inflow Protection. Construct as specified in Section 312. 308.03.23 Rock Outlet Protection (ROP). Construct as specified in Section 312. 308.03.24 Gabion Outlet Protection. Construct as specified in Section 313. 308.03.25 Gabion Inflow Protection. Construct as specified in Section 313. 308.03.26 Super Silt Fence (SSF). Use a 7-gauge top tension wire continuously between posts. 308.03.27 Filter Berms (FB). Use wood chips and up to 50 percent compost. 308.03.28 Filter Log. Use compost for filter media. Drive stakes perpendicular to water flow at a maximum of 8 ft intervals. Restrict vehicular and construction traffic from crossing filter logs. Once the drainage areas to filter logs are permanently stabilized with vegetation, with concurrence of the Engineer and the REC, remove stakes. Filter logs may remain in place and vegetated or removed. If remaining in place, cut filter log casings open, remove all non-biodegradable material, spread the compost as a soil supplement, and perform the pertinent vegetative establishment.
308.03.29 Temporary Stone Outlet Structure (TSOS). Permanently stabilize the area
immediately after removal of the structure. 308.03.30 Temporary Gabion Outlet Structure (TGOS). Construct as specified in Section 313. Grade and stabilize the area beneath the structure, immediately upon removal. 308.03.31 Dewatering. Dewater only when conditions facilitate successful operations and does not alter stream clarity. When dewatering discharges flow to Tier II stream or Waters of the State indicated as having an impairment of sediment or a sediment-related parameter, comply with benchmark monitoring for turbidity. Minimize the discharge of pollutants from dewatering operations as follows.
a.Route dewatering water through ESC measures designed to minimize discharges of pollutants and prevent discharges from altering visual turbidity or clarity.
b.Do not discharge visible floating solids or foam. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
c.To the extent feasible, use well-vegetated, upland areas of the site to infiltrate dewatering water before discharge. Do not use Waters of the State as part of the treatment area.
d.Use stable, erosion-resistant surfaces, including but not limited to well-vegetated grassy areas, clean filter stone, or geotextile underlayment, to discharge from dewatering controls.
e.Do not place dewatering operations on steep slopes.
f.At all points where dewatering water is discharged, use velocity dissipation measures. (g) With backwash water, either remove and dispose or return it to the beginning of the treatment process.
h.For filter bags, determine filter bag dimensions necessary to provide the required storage volume, determine pump and hose sizes, and install. Do not place filter bags on steep slopes.
i.For portable sediment tanks, determine the dimensions necessary to provide the necessary storage volume.
308.03.32 Sediment Traps. Excavate and grade sediment traps to the specified length, width, and
depth. When grading and paving operations are complete and permanent vegetative stabilization within the drainage areas to sediment traps, including slopes and channels, have been applied and those areas are vegetated with at least a 3 inches of growth, with the concurrence of the Engineer and the REC refill sediment traps with suitable materials, shape, and permanently stabilize as specified.
308.03.33 Stone for Sediment Control. Place No 57 aggregate, 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. 308.03.34 Maintenance of Stream Flow. Maintain the continuous flow of waterways as specified. Ensure that all excavation performed within the protected stream area is performed in a dewatered condition, which may require additional pumps, sheeting, shoring, cofferdams, and other measures. With concurrence of the Engineer and REC, adjust stream diversion as necessary to ensure satisfactory performance of the diversion, using additional ESC measures and equipment as appropriate. Always securely anchor the stream diversion system in place to prevent movement during high water and storm events. Submit to the Engineer for approval the method of anchoring before implementing. Do not install anchors beyond the LOD or infringe on the available channel area for stream flow. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS Upon completion of construction and when temporary drainage devices are no longer necessary, with the concurrence of the Engineer and the REC, remove the stream diversion.
308.03.35 Removal of ESC Measures. Do not remove ESC measures until all disturbed areas
have been permanently stabilized, vegetation is at least 4 inches tall, exhibits dark green color, and has achieved at least 95 percent groundcover. Do not remove ESC measures without concurrence from the REC and the Engineer.
308.04 Measurement and Payment
The payment will be full compensation for all material, labor, equipment, tools, and incidentals necessary to complete the work. Replacement of Erosion and Sediment Control 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. Other damages as a result of an event are subject to TC-7.03. Maintenance, repairs, rehabilitation, removal, and corrective actions of and to ESC measures will not be measured, but the cost will be incidental to the Contract price for the pertinent item. The cost of posting a notice of National Pollutant Discharge Elimination System (NPDES) permit coverage for stormwater discharges associated with construction activities will be measured and paid per the temporary sign item. Corrective actions, due to one or more ‘F’ ratings or are otherwise necessary due to degradation to sensitive areas, protected resources, or Waters of the State due to the Contractor’s action or in-action, directly or indirectly, or performed by Administration personnel or another contractor under the direction of the Administration will be at the Contractor’s expense.
308.04.01 Erosion and Sediment Control Manager (ESCM). The Erosion and Sediment
Control Manager will not be measured but the cost will be incidental to the Erosion and Sediment Control items. Replacement of the Erosion and Sediment Control Manager with a new Erosion and Sediment Control Manager will be at no additional cost to the Administration.
308.04.02 Claims. No claims against the Administration will be considered due to a shutdown of
the grading operations or the entire project that resulted from non-compliance. 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.
308.04.03 Incentive Payments and Liquidated Damages Amounts. Applicable amounts as
specified. 308.04.04 Incentive Payments. When incentive payments are specified payment schedule is as follows, beginning at the Notice to Proceed. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
a.Rating Quarters and Quarterly Incentive Payments. A rating quarter is a three- month period in which at least 4 inspections are performed by the Regional Environmental Coordinator. An average score of at least 85.0 for the entire quarter is necessary to receive the quarterly incentive amount. Payment will be made within 60 days from the end of the quarter. No incentive will be paid for partial quarters or for three-month periods with less than 4 inspections by the Regional Environmental Coordinator. Time extensions approved by the Administration that increase the number of eligible rating quarters will be drawn from the Final Incentive Payment.
b.Disqualification for Incentive Payments. Ratings quarters in which a ‘D’ or ‘F’ rating occurs and/or a Maryland Department of the Environment enforcement action is issued are disqualified from the quarterly incentive for the quarter(s) in which they occurred, regardless of the average score for those entire quarter(s) and no payment will be made.
c.Final Incentive Payment. When no ‘D’ or ‘F’ ratings have been received, the average score for the Contract is at least 85.0, and no Maryland Department of the Environment enforcement actions have been issued, the final incentive payment will be made at Final Closeout in the amount specified or the remaining amount if additional eligible rating quarters were added by time extensions approved by the Administration.
308.04.05 Liquidated Damages. When 'D' or 'F' ratings are received, liquidated damages will be
assessed, and deductions imposed.
308.04.06 Stabilized Construction Entrance (SCE). Stabilized Construction Entrance will be
measured and paid for at the Contract unit price per each. When drainage pipe under the Stabilized Construction Entrance is specified, the pipe will not be measured but the cost will be incidental to the Stabilized Construction Entrance item.
308.04.07 Wash Racks for Stabilized Construction Entrance. Wash Racks for Stabilized
Construction Entrance will be measured and paid for at the Contact unit price per each. 308.04.08 Erosion and Sediment Control Original Excavation. Erosion and Sediment Control Original Excavation will be measured and paid for at the Contract unit price per cubic yard. 308.04.09 Erosion and Sediment Control Cleanout Excavation. Erosion and Sediment Control Cleanout Excavation will be measured and paid for at the Contract unit price per cubic yard. 308.04.10 Temporary Mulch. Temporary Mulch will be measured and paid for as specified in
704.04.01 308.04.11 Temporary Seed. Temporary Seed will be measured and paid for as specified in
704.04.02 308.04.12 Turfgrass Sod. Turfgrass Sod will be measured and paid for as specified in 708.04.01.
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.04.13 Soil Stabilization Matting (SSM). Soil Stabilization Matting will be measured and
paid for as specified in 709.04.
308.04.14 Heavy Use Area Protection. Heavy use area protection will not be measured but the
cost will be incidental to the pertinent Erosion and Sediment Control measures. 308.04.15 Stockpile Areas. Stockpile areas will not be measured but the cost will be incidental to the pertinent Erosion and Sediment Control measures. 308.04.16 Earth Dike (ED). Earth Dike will be measured and paid for at the Contract unit price per linear foot. 4 inch to 7 inch. stone, temporary seeding, and soil stabilization will be measured and paid for as specified in 308.04.60, 704.04, and 709.04, respectively.
308.04.17 Temporary Swale (TS). Temporary Swale will be measured and paid for at the
Contract unit price per linear foot. 4 inch to 7 inch 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.
308.04.18 Perimeter Dikes/Swales. Perimeter Dikes/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.
308.04.19 Temporary Storm Drain Diversion. Temporary Storm Drain Diversion will be
measured and paid for at the Contract unit price per linear foot of the size specified. 308.04.20 Temporary Asphalt Berm. Temporary Asphalt Berm will be measured and paid for at the Contract unit price per linear foot for 5 inch Asphalt Berm. 308.04.21 Clear Water Diversion (CWD). Clear Water Diversion will be measured and paid for at the Contract unit price per linear foot of the size specified. The payment will include pipe, connections, anchors, sandbags, sheeting, dewatering, and turbidity monitoring when monitoring is required.
308.04.22 Temporary Barrier Diversion. Temporary Barrier Diversion will be measured and
paid for at the Contract unit price per linear foot. The payment will include barrier, sandbags, sheeting, dewatering, and turbidity monitoring when monitoring is required.
308.04.23 Mountable Berm. Mountable Berm will be measured and paid for at the Contract unit
price per each. 308.04.24 Diversion Fence. Diversion Fence will be measured and paid for at the Contract unit price per linear foot. 308.04.25 Pipe Slope Drain (PSD). Pipe Slope Drain will be measured and paid for at the Contract unit price per linear foot of the size specified. The payment will include excavation, backfill, flared end section, geotextile, anchors, coupling bands, and pipe elbows. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.04.26 Stone Check Dam. Stone Check Dam will be measured and paid for at the Contract
unit price for one or more of the pertinent items from the following. The payment will include geotextile, excavation, and backfill.
a.4 Inch to 7 Inch Stone for Sediment Control. 4 Inch to 7 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
b.Washed Aggregate. Washed aggregate will be measured and paid for at the Contract unit price per ton for 3/4 inch to 1-1/2 inch Stone for Sediment Control.
308.04.27 Riprap Inflow Protection. Riprap Inflow Protection will be measured and paid for per
ton for Riprap for Sediment Control.
308.04.28 Gabion Inflow Protection. Gabion Inflow Protection will be measured and paid for
per cubic yard. 308.04.29 Rock Outlet Protection. Rock Outlet Protection will be measured and paid for at the Contract unit price per square yard for Riprap Slope and Channel Protection. 308.04.30 Plunge Pool. Plunge Pool will be measured and paid for at the Contract unit price per square yard for Riprap Slope and Channel Protection. 308.04.31 Silt Fence (SF). Silt Fence will be measured and paid for at the Contract unit price per linear foot. 308.04.32 Silt Fence on Pavement. Silt Fence on Pavement will be measured and paid for at the Contract unit price per linear foot for Silt Fence. 308.04.33 Super Silt Fence (SSF). Super Silt Fence will be measured and paid for at the Contract unit price per linear foot. 308.04.34 Clear Water Pipe Through Silt Fence or Super Silt Fence. Clear Water Pipe Through Silt Fence or Super Silt Fence will not be measured but the cost will be incidental to the pertinent clear water diversion and silt fence items.
308.04.35 Filter Berm. Filter Berm will be measured and paid for at the Contract unit price per
linear foot. 308.04.36 Filter Log. Filter Log will be measured and paid for at the Contract unit price per linear foot for the size specified. 308.04.37 Temporary Stone Outlet Structure (TSOS). Temporary Stone Outlet Structure will be measured and paid for per ton for 2 inch. to 3 inch Stone for Sediment Control. The payment will include the baffle board, stakes, and geotextile.
308.04.38 Temporary Gabion Outlet Structure. Temporary Gabion Outlet Structure will be
2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS measured and paid for at the Contract unit price per each.
308.04.39 Standard Inlet Protection. Standard Inlet Protection will be measured and paid for at
the Contract unit price per each for Inlet Protection. 308.04.40 At Grade Inlet Protection. At Grade Inlet Protection will be measured and paid for the Contract unit price per each for Inlet Protection. 308.04.41 Curb Inlet Protection. Curb Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection. 308.04.42 Median Inlet Protection. Median Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection. 308.04.43 Median Sump Inlet Protection. Median Sump Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection. 308.04.44 Combination Inlet Protection. Combination Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection. 308.04.45 Gabion Inlet Protection. Gabion Inlet Protection will be measured and paid for at the Contract unit per each for Inlet Protection. 308.04.46 Catch Basin Insert. Catch Basin Insert will be measured and paid for at the Contract unit price per each for Inlet Protection. 308.04.47 Dewatering Practices. Dewatering Practices will be measured and paid for at the Contract unit price for the pertinent dewatering item. The payment will include turbidity monitoring when monitoring is required.
a.Removable Pumping Station. Removable Pumping Station will be measured and paid for at the Contract unit price per each. The payment will include excavation, pipe, geotextile, wire mesh, steel plate, stone, hose, pump, and connections.
b.Sump Pit. Sump Pit will be measured and paid for at the Contract unit price per each. The payment will include excavation, pipe, geotextile, wire mesh, steel plate, stone, hose, pump, and connections.
c.Portable Sediment Tank. Portable Sediment Tank will be measured and paid for at the Contract unit price per each. The payment will include pipe, geotextile, wire mesh, steel plate, hose, pump, and connections.
d.Filter Bags. Filter Bags will be measured and paid for at the Contract unit price per each. The payment will include pump, hoses, connections, mulch, compost, woodchips, sand, and straw bales. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.04.48 Sediment Traps. Sediment Traps, including ST-I, ST-II, and ST-III, will be measured
and paid for at the Contract unit price for one or more of the pertinent items as follows.
a.Erosion and Sediment Control Original Excavation. Erosion and Sediment Control Original Excavation as specified in 308.04.08.
b.Pipe. Pipe as specified in 303.04.
c.Stone and Aggregate. Stone and Aggregate will be measured and paid for at the Contract unit price for one or more of the pertinent items from the following. The payment will include geotextile, excavation, and backfill.
1.Riprap for Sediment Control. Riprap for Sediment Control will be measured and paid for at the Contract unit price per ton.
2.No. 57 Stone for Sediment Control. No. 57 Stone for Sediment Control will be measured and paid for at the Contract unit price per ton. (3) 3/4 Inch to 1-1/2 Inch Stone for Sediment Control. 3/4 Inch to 1-1/2 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
4.2 Inch to 3 Inch Stone for Sediment Control. 2 Inch to 3 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton. (5) 4 Inch to 7 Inch Stone for Sediment Control. 4 Inch to 7 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
d.Geotextile. Geotextile will not be measured but the cost will be incidental to the Contact unit price for the pertinent stone and aggregate item(s).
e.Inflow Protection. As follows.
1.Riprap Inflow Protection. Riprap Inflow Protection will be measured and paid for per ton for Riprap for Sediment Control.
2.Gabion Inflow Protection. Gabion Inflow Protection will be measured and paid for per cubic yard.
f.Baffle Board and Stakes. Baffle board and Stakes will not be measured but the cost will be incidental to the Contract unit price for the pertinent inflow protection item(s).
g.Temporary Risers. Temporary Risers will be measured and paid for at the Contract unit price per each.
h.Anti-Seep Collars. Anti-Seep Collars will be measured and paid for at the Contract 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS unit price per each.
308.04.49 Sediment Basins. Sediment Basins will be measured and paid for at the Contract unit
price for one or more of the pertinent items as follows.
a.Erosion and Sediment Control Original Excavation. Erosion and Sediment Control Original Excavation as specified in 308.04.08.
b.Pipe. Pipe as specified in 303.04.
c.Stone and Aggregate. As specified in 308.04.48(c). (d) Geotextile. Geotextile will not be measured but the cost will be incidental to the Contract unit price for the pertinent stone and aggregate item(s).
e.Baffle Board and Stakes. Baffle Board and Stakes will not be measured but the cost will be incidental to the Contract unit price for the pertinent stone and aggregate item(s).
f.Temporary Risers. Temporary Risers will be measured and paid for at the Contract unit price per each. The payment will include trash racks, draw down devices, concrete bases, projection collars, and riser connectors.
g.Modifying Stormwater Management Riser Structures. Modifying Stormwater Management Riser Structures will be measured and paid for at the Contract unit price per each for Convert Stormwater Management Riser for Sediment Control. The payment will include installing and removing dewatering pipe systems and restoring stormwater management riser structures to the original condition.
h.Anti-Seep Collars. Anti-Seep Collars will be measured and paid for at the Contract unit price per each.
308.04.50 Temporary Access Bridge. Temporary Access Bridge will be measured and paid for
at the Contract lump sum price.
308.04.51 Temporary Access Culvert. Temporary Access Culvert will be measured and paid for
at the Contract unit price per linear foot. 308.04.52 Onsite Concrete Washout Structures. Onsite Concrete Washout Structures will not be measured but the cost will be incidental to the pertinent concrete mixes. The payment will include implementation of controls associated with pollution prevention activities.
308.04.53 Vegetative Stabilization. Vegetative Stabilization will be measured and paid for at the
Contract unit price for one or more of the pertinent temporary and permanent item(s). Reapplication of the pertinent stabilization to vegetated areas that have been permanently stabilized and are disturbed or re-disturbed as a result of failure to maintain controls, general 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS negligence, or due to other activities not specifically authorized by the appropriate approval authority will be at no additional cost to the Administration.
308.04.54 Stone and Aggregate for Sediment Control. As follows. Geotextile, excavation, and
backfill will not be measured but the cost will be incidental to the Contract price.
a.Riprap for Sediment Control. Riprap for Sediment Control will be measured and paid for at the Contract unit price per ton.
b.Class I Riprap for Slope and Channel Protection. Class I Riprap for Slope and Channel Protection will be measured and paid for at the Contract unit price per square yard.
c.Class II Riprap for Slope and Channel Protection. Class II Riprap for Slope and Channel Protection will be measured and paid for at the Contract unit price per square yard.
d.No. 57 Stone for Sediment Control. No. 57 Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
e.3/4 Inch to 1-1/2 Inch Stone for Sediment Control. 3/4 Inch to 1-1/2 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
f.2 Inch to 3 Inch Stone for Sediment Control. 2 Inch to 3 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
g.4 Inch to 7 Inch Stone for Sediment Control. 4 Inch to 7 Inch Stone for Sediment Control will be measured and paid for at the Contract unit price per ton.
308.04.55 Maintenance of Stream Flow. Maintenance of Stream Flow will not be measured but
will be paid for at the Contract lump sum price. Diversion structures necessary to satisfactorily divert the stream flow, anchoring of the system, excavation, backfill, dewatering the site and excavation within the stream diversion area, sandbags, polyethylene sheeting, diversion pipes, pumps, hoses, connections, portable sediment tanks, maintenance, repairs, rehabilitation, removal, removal and resetting, relocation, corrective actions of and to ESC measures, turbidity monitoring when required, and implementation of controls associated with pollution prevention activities especially with regards to stream clarity, cleanup, and restoration of the stream diversion area that is damaged will not be measured, but the cost will be incidental to the Contract lump sum price. Payment will not be adjusted for alternative stream diversion systems regardless of changes in quantities from that shown in the Contract Documents. No payment adjustments will be made for corrective actions to meet stream clarity discharge requirements. 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. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
308.04.56 Sandbags. When Sandbags are specified for use other than when incidental to
304.04 21, 304.04.22, 308.04.55 or otherwise specified as incidental, sandbags will be measured
and paid for per cubic yard. 309 — CONCRETE DITCHES CATEGORY 300 DRAINAGE SECTION 309 — CONCRETE DITCHES
309.01 Description
Construct concrete ditches and incidental toe walls.
309.02 Materials
Crusher Run Aggregate CR-6 901.01 No. 57 Aggregate 901.01 Curing Materials 902.07 Form Release Compounds 902.08 Portland Cement Concrete 902.10, Mix No. 2 Joint Sealer 911.01 Preformed Joint Filler 911.02 Borrow Section 916 Soil Stabilization Matting 920.05
309.03 Construction
309.03.01 Excavation. Excavate and prepare the subgrade as specified in Section 602. For
excavated material, refer to 402.03.01. 309.03.02 Forms. Use steel or wooden forms meeting Section 603.
309.03.03 Concrete. Mix and place as specified in Section 603.
309.03.04 Joints. Place joints no more than 15 ft apart. Use either bulkhead or weakened plane
construction joints. Either tool or saw weakened plane joints to a depth of at least 3/4 in. Place expansion joints no more than 90 ft apart and seal.
309.03.05 Cold Weather Construction and Curing. Refer to 520.03.02 for cold weather
construction and to 520.03.12 for concrete curing. 309.03.06 Backfill. After the forms have been removed, place and compact the backfill. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 332–352 of 1,113.