Module 7: Construction PhaseModule 7: Construction Phase

Learning Objectives Learning Objectives

Identify how to integrate BMPs into the Construction phase of a project

Footnote: The term ‘Engineer’ in this module refers to the MDT

Project Engineer

Construction GoalConstruction Goal

The goal of the erosion and sediment control plan sheets and the Storm Water Pollution Prevention Plan (SWPPP) are to incorporate BMPs into the construction stage in order to protect surface waters

Joint Participation RequiredJoint Participation Required

MDT Personnel, Contractor and Regulatory Agency participation is required during the construction phase of the project to properly implement BMPs

Communication between all parties is required to ensure BMP installation and performance is in accordance with the SWPPP

Award of ContractAward of Contract

Erosion and sediment control issues and responsibilities are identified

MDT NOI Package Review and FinalizationMDT NOI Package Review and Finalization

Contractor revised SWPPP submitted to MDT

SWPPP reviewed by MDT and submitted to regulatory agency (DEQ)

NOI and SWPPP submitted simultaneously to DEQ

MDT and Contractor responsible to ensure SWPPP complies with General Permit

Contractor/MDT shall amend the SWPPP as changes are required due to construction activities

Pre-construction ConferencePre-construction Conference

Kickoff meeting required for all construction projects

Qualifications of the Contractor’s designated erosion and sediment control supervisor are reviewed during the meeting

Erosion and Sediment Control SubmittalsErosion and Sediment Control Submittals

Quality product list

Certified seed tags

Weed free straw/straw bale certification

Implementation of SWPPP and Initial BMP InstallationImplementation of SWPPP and Initial BMP Installation

Prior to mobilization

Adaptation of SWPPP to match site conditions and goal of environmental protection

Contractor’s responsibility to protect the environment from excess erosion

MobilizationMobilization

Following pre-construction conference mobilization can begin

Finalized NOI and SWPPP along with required permits required prior to construction

BMPs must be placed prior to disturbance

Installation of Remaining BMPs Throughout ConstructionInstallation of Remaining BMPs Throughout Construction

BMP installation in accordance with SWPPP

BMP inspection in accordance with General Permit

BMP maintenance as required

Inspection of BMPs During Construction Inspection of BMPs During Construction

Weekly Contractor and Engineer inspections

Following storm water events

Contractor required to visually monitor BMP effectiveness and make any modifications

BMP monitoring/maintenance checklist

BMPs failing inspection must be repaired

Re-inspect following maintenance or repair

318 permit requirements

BMP Maintenance During ConstructionBMP Maintenance During Construction

Proper maintenance minimizes non-compliance

Weekly monitoring used to reveal maintenance issues

BMP failures require Engineer/Contractor evaluation for repair/replacement

Minor maintenance to be performed on a daily basis

Field Modifications to SWPPPField Modifications to SWPPP

All SWPPP modification require Engineers approval

Modify SWPPP if existing BMPs are not fulfilling stabilization or sedimentation goals

SWPPP revision may require P.E. and/or CPESC

MDT review of SWPPP prior to implementation

Under emergency conditions BMPs can be added

BMP Reporting and Record KeepingBMP Reporting and Record Keeping

Inspections determine effectiveness, proper installation, and maintenance

Supply Engineer with Contractors inspection documentation

Monitoring checklists should be integrated into an MDT database

Monitoring reports should contain a description of maintenance procedures applied

Winterization of BMPs if ApplicableWinterization of BMPs if Applicable

May be required depending on weather conditions

Winterize for seasonal shutdown or downtime exceeding 1 month

Implement winterization BMPs prior to winter weather

Inspect BMPs per Engineers specifications

Remove and/or replace BMPs that are not effective

Contractor Removal of BMPs if AppropriateContractor Removal of BMPs if Appropriate

BMPs to be removed when determined by MDT to be no longer required

BMP Inspection and Maintenance Turned Over to MDT Maintenance SectionBMP Inspection and Maintenance Turned Over to MDT Maintenance Section

Long-term maintenance of construction BMPs will be carried out by MDT maintenance personnel

Need to get BMPs in good shape prior to handoff to MDT

Project CloseoutProject Closeout

Wrap up construction activities

Demobilization

Removal of construction BMPs

Install post-construction BMPs

DemobilizationDemobilization

Minimize impact to establishing vegetation or to prepared seedbed

Implementation of SWPPP and Initial BMP Installation

Implementation of SWPPP and Initial BMP Installation

MobilizationMobilization

Inspection of BMPs During Construction

Inspection of BMPs During Construction

BMP Maintenance During Construction

BMP Maintenance During Construction

Installation of Remaining BMPs Throughout Construction

Installation of Remaining BMPs Throughout Construction

Award of ContractAward of Contract

Contractor Completion of NOI PackageContractor Completion of NOI Package

MDT NOI Package Review and FinalizationMDT NOI Package Review and Finalization

Preconstruction ConferencePreconstruction Conference

Erosion and Sediment Control SubmittalsErosion and Sediment Control Submittals

BMP Reporting and Record KeepingBMP Reporting and Record Keeping Field Modifications to SWPPPField Modifications to SWPPP

Winterization of BMPs if ApplicableWinterization of BMPs if Applicable

DemobilizationDemobilization

Project CloseoutProject Closeout BMP Inspection and Maintenance Turned Over to MDT Maintenance Section

BMP Inspection and Maintenance Turned Over to MDT Maintenance Section

Contractor Removal of BMPs if AppropriateContractor Removal of BMPs if Appropriate

Reference Manual

Page 205

Erosion and Sediment Control Construction Phase Tools Erosion and Sediment Control Construction Phase Tools

The BMP Reference Manual contains checklists and reporting forms

BMP Monitoring/Maintenance Checklist for use during constructionBMP Monitoring/Maintenance Checklist for use during construction

Project

Location

BMP Installation and Monitoring During Construction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BMP Installation and Monitoring Schedule FormBMP Installation and Monitoring Schedule Form

Winterization Checklist Winterization Checklist

BMP Winterization Checklist

Limit fall–time disturbance of surface area to only that which can be properly protected for snowmelt runoff?

Schedule temporary or erosion seeding prior to ground freezing?

Determine applicability of snow management BMPs and apply as appropriate?

Evaluate wintertime access to maintain BMPs?

Make sure all BMPs are in place and able to with stand spring thawing and snow melt conditions?

Project Closeout ChecklistProject Closeout Checklist

Case Study 1Case Study 1

Construction plans call for the use of SS-9 across the top of a large cut slope. The contractor does not want to mobilize equipment and asks to use SC-1.

What would you do and why?

Case Study 1 (cont.)Case Study 1 (cont.)

Referring to Table 4.4.1-1, SS-9 intercepts, diverts, and conveys surface run-on. SC-1 slows and filters runoff to retain sediment.

SC-1 should not be used to substitute SS-9.

Case Study 2Case Study 2

Construction plans shows SS-6 on a side slope that was intended to be disturbed during the end of the construction process. Due to construction timing the Contractor will be re-disturbing the slope in less then 14 days. The contractor would like to use SS-12.

Is this acceptable?

Case Study 2 (cont.)Case Study 2 (cont.)

SS-12 can be used assuming there is no impending adverse weather and that the slope will be re-disturbed in less than 14 days. Seeding is required if slope is left for more then 14 days.

ConclusionsConclusions

SWPPP finalized after award of contract

SWPPP implemented prior to construction

BMPs are installed

BMPs are monitored

BMPs are maintained

After demobilization of the construction contractor, MDT assumes maintenance responsibility

Discussion and QuestionsDiscussion and Questions