Estimating Guidance for CGP

September 2010

California Department of Transportation

Division of Design

Office of Storm Water Management

1120 N Street

Sacramento, California

TABLE OF CONTENTS

1. ESTIMATING BEES ITEMS ...............................................................................................................1

1.1. OVERVIEW ...................................................................................................................................1

1.2. CONSTRUCTION SITE MANAGEMENT (BEES ITEM: 074016)...........................................1

1.3. PREPARE WATER POLLUTION CONTROL PROGRAM (BEES ITEM: 074017) ................1

1.4. PREPARE STORM WATER POLLUTION PREVENTION PLAN (BEES ITEM: 074019) ....1

1.5. RAIN EVENT ACTION PLAN (BEES ITEM: 074056) ...............................................................3

1.6. STORM WATER ANNUAL REPORT (BEES ITEM: 074057) ...................................................4

1.7. STORM WATER SAMPLING AND ANALYSIS DAY (BEES ITEM: 074058) ........................ 4

1.8. RECEIVING WATER BIOASSESSMENT (RL 3) (BEES ITEM:_______)................................ 5

1.9. WATER POLLUTION CONTROL MAINTENANCE SHARING (BEES ITEM: 066595) ........5

1.10. ADDITIONAL WATER POLLUTION CONTROL (BEES ITEM: 066596) ............................... 6

1.11. STORMWATER SAMPLING AND ANALYSIS (BEES ITEM: 066597)...................................6

1.12. ALL OTHER SEPARATE ITEM BMPS.......................................................................................7

Caltrans Storm Water Quality Handbook

Estimating Guidance for CGP

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TABLE OF CONTENTS

LIST OF TABLES

T

ABLE 1 [PPDG TABLE F-6: CONSTRUCTION SITE WATER POLLUTION CONTROL] ... ERROR! BOOKMARK NOT

DEFINED

.

List of Figures

FIGURE 1-1 FIND CLIMATE DATA USING D8S INTERNAL WEBSITE ....................................................................3

LIST OF ACRONYMS

BEES Basic Engineering Estimating System

BMPs Best Management Practices

CGP Construction General Permit

CSMP Construction Site Monitoring Program

EPA Environmental Protection Agency

Eqn. Equation

NOAA National Oceanic Atmospheric Administration

NPDES National Pollutant Discharge Elimination System

PE Professional Engineer

PPDG Project Planning and Design Guide

RE Resident Engineer

REAP Rain Event Action Plan

RL Risk Level

RQM Routine Quarterly Monitoring

RWQCB Regional Water Quality Control Board

SAP Sampling and Analysis Plan

SSP Standard Special Provisions

SWM Storm Water Monitoring

SWPPP Storm Water Pollution Prevention Plan

WPC Water Pollution Control

WPCP Water Pollution Control Program

WQPT Water Quality Planning Tool

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Estimating Guidance for CGP

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SECTIONFOUR Precipitation and other Climate Data

1. ESTIMATING BEES ITEMS

1.1. OVERVIEW

The new Construction General Permit (CGP: Order No. 2009-009-DWQ, NPDES No.

CAS000002) has different, often increased, requirements for stormwater sampling and

reporting than the old NPDES permit. To accommodate the new CGP requirements in

future highway jobs, the following guidance is offered to estimate the various stormwater

pay items including several new items of work.

The CGP takes a risk-based approach based upon sediment discharge and receiving water

risk. The risk level (RL) increases from RL 1 to RL 3 as the potential threat to water

quality increases. Consequently, some contract items apply to all jobs and some only

apply to those with the higher risk levels.

This estimating guidance applies to all projects including the small construction jobs and

those under the CGP.

1.2. CONSTRUCTION SITE MANAGEMENT (BEES ITEM: 074016)

Examine local BEES bid history to estimate costs for Construction Site Management (SSP

07-346). Coordinate cost estimate with Construction.

1.3. PREPARE WATER POLLUTION CONTROL PROGRAM (BEES ITEM:

074017)

Projects with less than one (1) acre of soil disturbance will have Prepare Water Pollution

Control Program (WPCP). Small construction projects, between 1 and 5 acres of soil

disturbance, that qualify for an EPA Erosivity Waiver will also have a WPCP. Use Table

F-6 to estimate the cost of WPCP.

1.4. PREPARE STORM WATER POLLUTION PREVENTION PLAN (BEES

ITEM: 074019)

Use Table F-6 to estimate the cost of preparing the written document describing the

implementation of the project’s water pollution controls. Projects with one (1) acre or

more disturbed soil area will have Prepare Storm Water Pollution Prevention Plan

(SWPPP). Prepare SWPPP includes the cost to prepare the Construction Site Monitoring

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-

--

-

SECTIONFOUR Precipitation and other Climate Data

Program (CSMP) that includes Sampling and Analysis Plan (SAP) and conduct visual

mo

nitoring.

Table F

Table FTable F

Table F 6: Construction Site Water Pollution Control

6: Construction Site Water Pollution Control6: Construction Site Water Pollution Control

6: Construction Site Water Pollution Control

a) Total Construction Cost

Prepare

SW

PPP

Prepare

WP

CP

$0 to $500,000 $2

,200 + RQM $1,000

$500,000 to $1,000,000 $2,700 + RQM $1,100

$1,000,000 to $1,500,000 $2

,800 + RQM $1,100

$1,500,000 to $12,000,000 $3,200 + RQM $1,200

Greater than $12,000,000 $6

,000 + RQM -

Note: Information derived from 2009 average bid costs using Caltrans Cost

D

atabase with an additional mark-up to account for qualified developers of the

SWPPP.

Routine Quarterly Non-Storm Water Monitoring (RL 1, 2, and 3): All projects required to

develop a SWPPP regardless of the RL are to conduct quarterly non-storm water visual

monitoring and storm-triggered visual monitoring. To develop cost estimates for routine,

quarterly, non-storm water monitoring, equation 1 below should be used. The costs for

storm-triggered visual monitoring is assumed to already be included in the costs for

preparing a SWPPP, as this was already a Caltrans requirement prior to the development of

the new CGP.

The cost of routine quarterly monitoring (RQM) for non-storm water discharges is a

f

unction of the project duration, the drainage area, and the cost per inspection, and can be

estimated using Equation 1 as follows:

RQM Cost = (Months/3 + 1) x (N + 4) x Labor (Eqn. 1)

where:

Months = the number of months the project will be occurring, including from

i

nitial site work through the construction until soil is completely

stabilized after construction. This is used to estimate the number of

required quarterly inspections.

N = calculated number of discharge locations. It is assumed that each

d

ischarge area can be reviewed within 1 hour. An additional 4 hours

is provided to account for the time required to complete reporting

and follow-up.

Labor = estimated hourly labor rate for a qualified inspector. Assume $100

p

er hour is appropriate.

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SECTIONFOUR Precipitation and other Climate Data

1.5. RAIN EVENT ACTION PLAN (BEES ITEM: 074056)

All RL2 and RL3 projects are to implement a Rain Event Action Plan (REAP) in advance

of a forecasted storm. The contractor evaluates site readiness as part of formulating a

REAP. This contract item is non-adjustable.

The PE is to set aside $500 for each REAP that is anticipated to be prepared by the

construction contractor. To determine the number of days, use the mean number of days

reported for precipitation producing greater than or equal to 0.1 inches for the duration of

the project. Use climate data from a nearby representative station identified in the Water

Quality Planning Tool or published by the National Climatic Data Center of the National

Oceanic Atmospheric Administration

at:

(http://cdo.ncdc.noaa.gov/climatenormals/clim20/state-pdf/ca.pdf )

.

Another convenient method to find climate data is using District 8s internal website at:

(http://sv08arcgis/cgp2009/). The published National Climatic Data Center information can easily

be located nearest to your project.

Figure 1-1 Find Climate Data Using D8s Internal Website

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SECTIONFOUR Precipitation and other Climate Data

1.6. STORM WATER ANNUAL REPORT (BEES ITEM: 074057)

In order to account for the submittal of an annual report to the RWQCB regarding project

compliance with the CGP, the PE should set aside $2,000 for each year of construction.

This contract item is non-adjustable.

1.7. STORM WATER SAMPLING AND ANALYSIS DAY (BEES ITEM: 074058)

Storm Water Sampling and Analysis (monitoring) costs have become more discernable due

to new requirements of the CGP; consequently, the cost is to be associated with a unit price

in the PS&E. Monitoring costs for compliance with the CGP can be estimated using the

procedures and equations described below. Be sure to use only those procedures

applicable to the RL of the project and the associated representative number of rain days.

This contract item is non-adjustable.

The estimating procedure outlined below accounts for sampling and analysis costs based

primarily on the precipitation characteristics, discharge locations, and construction

duration of the project. The sections below outline the types of sampling and analysis

required for different RL 2 and RL 3 projects and how to develop associated cost

estimates.

Storm Water Monitoring for pH and Turbidity: Sampling and analysis of storm water

runoff for pH and turbidity is required at all RL 2 and RL 3 projects. At a minimum, 3

samples must be collected per day of qualifying storm events, which are those producing

precipitation of 0.5-inch or more at the time of discharge.

The cost of storm water monitoring (SWM) is a function of the precipitation frequency,

construction duration, and the number of sampling locations for the project, as well as the

cost per sample. The SWM cost can be estimated using Equation 2 as follows:

SWM Cost = M x {[Days

0.5”

x $1000] + $2000 (1 + 0.1 (Months/12))} (Eqn. 2)

where:

M = cost multiplier based on the number of anticipated discharge

sampling points. When M = 1, the cost estimate assumes that up to

7 locations can be sampled by one fully equipped staff per event.

Sites with 8 to 14 sampling locations assumes that one additional

staff-day will be required, thus M=2. For sites with 15 – 21

sampling locations M=3, and so forth.

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SECTIONFOUR Precipitation and other Climate Data

Days

0.5”

= estimated total number of days over project timeline with

precipitation event greater than 0.5 inches. However, it is

recommended that the difference between the mean number of days

for both precipitation events greater than 0.5 inches and 0.1 inches

be used. Use climate data from a nearby representative station

identified in the Water Quality Planning Tool or published by the

National Climatic Data Center of the National Oceanic Atmospheric

Administration at:

http://cdo.ncdc.noaa.gov/climatenormals/clim20/state-pdf/ca.pdf

Months = the number of months the project will be occurring, including from

initial site work through the construction until the site is completely

stabilized after construction.

$1000 = daily cost to perform sampling and analysis, as well as reporting,

using one staff at up to 7 discharge locations, excluding equipment.

$2000 = purchase cost for field turbidimeter, pH meter, calibration solutions,

rain gauge, and all ancillary sampling equipment. A maintenance

and calibration estimate of 10% per year is included in the equation.

The cost storm water sampling and analysis per day can be estimated using Equation 3 as

follows:

Storm Water Sampling and Analysis Day = SWM Cost / Days

0.5”

(Eqn. 3)

1.8. RECEIVING WATER BIOASSESSMENT (RL 3) (BEES ITEM:_______)

Bioassessment monitoring in receiving waters is required for all RL 3 projects that have

30 acres or more of disturbed area and directly discharge into receiving waters impaired for

sediment or listed with beneficial uses of COLD and SPAWN and MIGRATORY.

Bioassessment monitoring is required both upstream and downstream of the impacted area,

and both before and after the project. The CGP contains an estimate of $7,500 per sample

for this type of work. To account for this work, a supplemental cost of $30,000 should be

added to all RL 3 projects that disturb 30 or more acres and directly discharge into the

qualifying receiving waters.

1.9. WATER POLLUTION CONTROL MAINTENANCE SHARING (BEES

ITEM: 066595)

The Supplemental Work item for Water Pollution Control Maintenance Sharing still exists

but has been shifted to the individual separate item BMPs that allow for cost sharing.

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SECTIONFOUR Precipitation and other Climate Data

Water Pollution Control Maintenance Sharing cost should be no lower than the amount

es

timated for Prepare SWPPP (or Prepare WPCP). The following may be used to estimate

BMP maintenance costs based upon input from Districts where this approach was piloted.

The aggregate total of estimated maintenance costs would be combined into item WPC

Maintenance Sharing:

a) Temp. Silt Fence, estimate at 10% of the separate item cost per rainy season.

b) Temp. Fiber Roll, estimate at 10% of the separate item cost per rainy season.

c) Temp. Erosion Control and other hydraulically applied soil stabilization BMPs,

estimate at 10% of the separate item cost per rainy season.

d) Temp. Gravel Bag Berm, estimate at 25% of the item cost per rainy season.

e) Temp. Drainage Inlet Protection, estimate at 25% of the item cost per rainy

season.

f) Temp. Construction Entrance, estimate at 25% of the item cost per rainy season.

1.10. ADDITIONAL WATER POLLUTION CONTROL (BEES ITEM: 066596)

The Supplemental Work item for Additional Water Pollution Control will cover additional

WPC BMPs suggested by the RE or Contractor. This change order work is expected to be

minor for most projects. Estimate this item using the same rate as for Prepare SWPPP, less

RQM for SWPPP jobs. For WPCP jobs estimate at the same rate as Prepare WPCP.

1.11. STORMWATER SAMPLING AND ANALYSIS (BEES ITEM: 066597)

The Supplemental Work item for Storm Water Sampling and Analysis covers the cost of

lab tests for water quality samples. Estimate this item using the same rate as for Prepare

SWPPP less RQM.

Sampling and analysis for non-visible pollutants is not often required unless previous site

contamination is present, or WPC practices are failing and result in a discharge. The

number of samples, sampling frequency, and analyses for this type of monitoring is

unpredictable for this reason. It is recommended to account for this work as a supplemental

cost due to previous site contamination in coordination with the Hazardous Waste

Coordinator and District NPDES Storm Water Coordinator.

Sampling and analysis for suspended sediment concentration (SSC) is only required at RL

3 sites with previous exceedances of the daily average turbidity NEL. The additional labor

cost required to conduct this sampling would be minimal since this would occur

concurrently with existing sampling for pH and turbidity, therefore the primary costs

would be analytical and reporting. Analytical costs are typically $100 per sample. Since

the quantity of samples is unknown, as this is a function of an exceedance of the NEL at

the project site, the PE should not assign any supplemental costs for this monitoring.

Receiving water quality monitoring is required only at RL 3 sites where exceedances of the

NEL have occurred and there is a direct discharge to a receiving water. Since it is unknown

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SECTIONFOUR Precipitation and other Climate Data

whether exceedances will occur, this cost can not be predicted nor should it be accounted

fo

r as a supplemental cost.

1.12. ALL OTHER SEPARATE ITEM BMPS

For the variety of separate contract item BMPs the Item Cost database on the OE website

will be sufficient. The items mentioned previously are not tracked so other methods must

be used as tools for guidance. Also refer to PPDG, Table F-5 for individual BMP costs and

Appendix C2 for estimating ATS.

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