Module 11 Tabulating SWMP Quantities

Module 11Tabulating SWMP Quantities

o Method of Measurement – The manner in which a “Pay Item” is measured to conform with the “Pay Unit” Subsection 101.41

o Basis of Payment – The terms under which “work” is paid, as a designated “Pay Item” in accordance with the quantity measured and the “Pay Unit.” Pay items paid for as described in contract and unit price. Subsection 101.05

Definitions

Tabulating SWMP Quantities 2

PSP

Spec.

Pay Item Description Pay Unit

X 202-04002 Clean Culvert Each203-01500 Blading Hour203-01550 Dozing Hour

Project EstimatingImportance of Accurate and Complete Plans – makes the bid process more effective.

Benefits CDOT, our contractors, and our customers by:

o Reducing the need to re-advertise a project

o Reducing the time it takes to evaluate bids

o Reducing the number of claims that are filed

o Increasing productivity in construction

o Providing accurate bid history information for future projects


Item Code Book https://www.codot.gov/business/eema/documents/2019/2019-item-code-bookEach CM has an Item Code number.Exampleo 208-00020 Silt Fence Silt Fence LF

Item Code Book and Reference Sites


See Ref to Item code book

https://www.codot.gov/business/eema/documents/2019/2019-item-code-book

Site Plan QuantitiesStep One:o Use MicroStation to measure pay items on plan sheetso Refer to SWMP Narratives for other needso Refer to Matrix for phasing needso Evaluate all elements needed for each CM

Example: – Initial Maps - Plastic Fence length as determined from site maps

is 6990 linear feet, – Interim Maps - Erosion logs length as determined from initial

site maps is 825 linear feet but also need to account for interim (may not be the same); and

– Permanent Maps – Seeding as determined from site maps is 22 acres.


Step Two:o Determine what factors will

influence additional quantities.

o Work with Construction Manager (if known) or Regional Environmental Staffdetermine additionalquantities.

o Length of wetted perimeter in ditches for logs and SRB/TRM and slopes for seeded areas.

o Consider all components that are needed for each activity (e.g permanent stabilization)

Site Plan Quantities


Step Three:

o Included Quantities for “As Directed” Work

o Include Force Account Item for unforeseen conditions

o Consider Equipment Hours for Erosion Control (Surface Roughening is part of overall work and is not a separate pay item)



o Planned Force Account- Items of work, included on the plans, which will be paid for in accordance with subsection 109.4 (CDOT Specifications Subsection 101.46)

o Using a force account pay item requires a Project Special Provision included in the contract. (Project Development Manual)

o Force account should be used when it is hard to anticipate which pay items are needed to protect soil and water resources.

o Should have additional quantities not just forced accounts.

Forced Accounts


Equipment Hours For Erosion Control


o Refer to Section 203 for blading and dozing hrso Work with Construction Managers about preference of

Equipment both type and size(horse power) to complete the task.

o Guidance

o Include in template – see Section 12.B. Must have minimum of 4 hours for blading and dozing 203 pay items.

203-01500 Blading- 140-250 hp

203-01510 Backhoe- 90-300 hp

203-01550 Dozing- 130-250 hp D6 to D7

203-01594 Combination Loader- 80-125 hp bucket and backhoe combination

Step Four – Other Considerations

o Source Control – Street Sweeping, Trash Pick up and VTPs

o Material Handling – Stockpiles, Concrete Washout

o Construction Access and Protection of Sensitive Environments

o Maintenance of CMs ando Erosion Control Management

(ECM) Item




• Pay items 214-00008 Extended Landscape Preservation. Refer the project special provision for all work to be performed during the extended landscape maintenance period for this project. [Check with Region Water Quality staff to see if extended landscape maintenance should be included on the project and the number of months (12-36) required]



Step Four – Other Considerations Notable Changes in 207, 212, and 214 quantities

• Topsoil strategies must be coordinated with overall earthwork quantities.

• Topsoil salvage and distribution depth increased from 4 to 6”• Added an option to import approved topsoil to projects • Added and option to remove existing topsoil from the project

site.• Salvaging of existing topsoil now paid using 207 pay items

and not as clearing and grubbing.• Also, may have specified mulches for permanent seeding and

seeding method paid with different pay items.



Other changes that will affect quantities:

• Salvaging topsoil is a separate pay item and NO longer part of clearing and grubbing

• Specification 214.03 (k) requires all projects to have a minimum amount of landscape maintenance included in cost of work until notice of substantial landscape completion has been issued.

• 214 Extended Landscape Preservation Worksheet can be used to determine pay item 214-00008.

SSP 207, 212, 214 Changes


o CDOT recommends staging and storage areas should be completely stabilized over the entire surface reduce tracking and sweeping. Consider adding quantities to cover this material and creating a project special (See next Module).

o Inlets need to be cleaned prior to construction add costs to budget for this task.

o Bridges should have a rundown and curb at the top to direct water to the rundown. This should be accounted for in costs.


14Tabulating SWMP Quantities



Step 5 – Stabilization

Determine interim stabilization and permanent final stabilization based on SWMP Plan Sheet information and environmental factors.

Interim Stabilization

o Use Disturbance Area times 1.5

o Multiple by the anticipated number of years of construction with little to no permanent stabilization.

o Use Bonded Fiber Matrix as the pay item.



The faster a project implements permanent stabilization the less it will have to spend on interim

stabilization

Permanent Stabilization

o Use Area to be Seeded from SWMP template (Section 1).

o Indicate quantities for type of seeding (drill, hyro, broadcast), mulching (types), mulch tackifier, soil amendments, SRB/TRM and any other permanent stabilization controls.

o See



Soil Amendment Quantities and Pay Items

Stormwater Management Plan Preparer Course

212-00701 Compost (Mechanically Applied)- CY

212-00702 Biotic Soil Amendments (Hydraulic Applied) Pounds

212-00703 Humate Pounds

212-00704 Mycorrhizae Pounds

212-00705 Elemental Sulfur Pounds

212-00700 Organic Fertilizer Pounds

Subgrade Preparation and Pay Item

SWMP Refresher Course

• Prior to the placement of topsoil, the subgrade must be ripped to a minimum of 14 inches to de-compact the soil.

• Required equipment and must use a rod penetrometer to verify de-compaction was successfully achieved.

• Contractor must submit a method statement for subgrade soil preparation.

207-00704 Subgrade Soil Preparation SY

Pay Item and Pay Unit

Temporary Seeding

SWMP Refresher Course

Topsoil is seeded with annual grasses if needed for interim stabilization or directed by CDOT.

• Seed method may be drill, hydraulic, or broadcast

• If hydraulic or broadcast must use 1.5 times seeding rates with no pay item for this cost.

• Pay item

1.D. ACRES OF DISTURBANCE: [Includes clearing, grading, excavation, stockpiling of fill materials, demolition, areas with heavy equipment/vehicle traffic, installation of new or improved haul roads and access roads, staging areas, dedicated borrow/fill areas and storage that will disturb existing vegetative cover.]

1. Total area of construction site:352. Total area of disturbance: 303. Acreage of seeding: 22

Quiz time

What are your quantities for interim and permanent stabilization using the information below from the Powers Blvd Extension North Project?

o Interim quantities – 30 acres times 2 year construction duration = 60 acres Bonded Fiber Matrix times 1.5 for safety factor =90 acres.

o Permanent quantities = 22 acres seeding (native drill seeding), mulching pick type, tackifier watch units and convert to lbs. Remember to check pay units. Add soil amendments as needed.


Quantities need to be evaluated using information on:

• Permanent stabilization maps indicating the types of seeding (drill seed, hydroseed, or broadcast) and the Plan Sheets indicating the acreage of each type of seeding

• Soil amendment information in the Plan Sheets


Permanent Stabilization Quantities

ECM

How do you calculate Erosion Control Management?


Use duration of the project in days with a multiplier between 0.25 and 1.0 depending on if the SWMP Administrator for Design believes the project will need someone full time, half day or quarter days? Check on estimated construction days.

1. Control measures depicted on the Site Maps and Control Measure Matrix

2. Duration of the project 3. Phasing (seasonal and winterization) as it relates

to quantities over duration4. Environmental factors

a. Windb. Soil typesc. Urban locationsd. Wildlife

Summary of Calculation Factors


Summary of Calculation Factors


5. Additional as directed quantities – get input from the Construction Project Engineer

6. Equipment hours and other inputs from the Construction Project Engineer

7. Include force account items

8. As directed quantities for irregularities and unforeseen circumstances based on experience

9. Control measure replacement temporary to permanent transition

10. Stabilization

SWMP Template -Tabulation of SWMP Quantities

12. TABULATION OF STORMWATER QUANTITIES


A. Control Measure sediment removal and disposal shall be paid for as: 208 Removal and Disposal of Sediment (Equipment) and 208 Removal and Disposal of Sediment (Labor). All other control measure maintenance shall be included in the cost of the control measure.

A. It is estimated that [XXX] hours of blading (140-250 horsepower), dozing (130-250 horsepower) and/or combination loader (80-125 horsepower) may be required for miscellaneous erosion control work as directed by the Engineer. Work shall be paid for as: [Select appropriate pay item, delete references to others] 203 Blading, 203 Dozing and/or 203 Combination Loader]

A. Establishment of seeded areas from Substantial Landscape Completion shall be paid for as: [Landscape Maintenance (24 Month), F/A Erosion Control, 212 Seeding (Native), 214 Landscape Maintenance or included in the price of the work]. This shall include mowing, weed control, reseeding/mulch/tackifier. [**Check with Region Water Quality staff to see if this section is needed and what Pay Item to use.**]

Tabulation of SWMP Quantities 12. TABULATION OF STORMWATER QUANTITIES[Designer to delete all that do not apply. Designer to verify SWMP tabulations quantities are included in the Summary of Approximate Quantities].The following pay items can be used for interim stabilization as defined in section 208.04(e)(2): 213-00002, 213-00003, 213-00004, 213-00007, 213-00012, 213-00013, 213-00061, 213-00150, 213-00151] [X in the PSP Spec Column refers to approved Project Special Provisions (PSP) located on the Landscape Architecture Website] if used make sure PSP is included in reviews[R1 in the PSP Spec. Column refers to Region 1 only PSP]W in the PSP Spec. Column refers to PSP Worksheets that are available on this website https://www.codot.gov/business/designsupport/cdot-construction-specifications/2019-construction-specifications/project-special-provision-work-sheets?b_start:int=20


PSPSpec.

Pay Item Description Pay Unit InitialConst

.

InterimConst.

PermanentStabilization

*TotalQuantity

X 202-04002 Clean Culvert Each203-01500 Blading Hour203-01550 Dozing Hour

X 203-01594 Combination Loader Hour207-00700 Topsoil (Onsite) CY207-00706 Seeding Media CY207-00702 Topsoil (Offsite) CY

https://www.codot.gov/business/designsupport/cdot-construction-specifications/2019-construction-specifications/project-special-provision-work-sheets?b_start:int=20

Summary of Approximate Quantities (SAQ)


1

Quiz Time


Why is it important to use the same nomenclature when referencing the SWMP quantities and control measures illustrated on the Site Maps?

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Questions?

Module 11 Tabulating SWMP Quantities

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