Georgia Risk-based Corrective Action (GRBCA)

Applicable Threshold Level Determination

at Petroleum Sites

Steven Wilson-GA EPD USTMPFebruary 2018

A Workbook Introduction

How does the VI Pathway impact the

GRBCA Workbook

and what are the implications for

petroleum release sites?

Georgia Risk-based

Corrective Action (GRBCA)

ENVIRONMENTAL PROTECTION DIVISION

GRBCA CURRENT PHASE: EXTERNAL STAKEHOLDER TESTING & REVIEW

√ USTMP commits to pursue RBCA process: Nov. 2015

√ USTMP and RAU Manager first meeting: Jan. – July 2016

-Evaluate RBCA & VI processes: goal to integrate into one process

-In-depth Reviews Completed: Research and literature, State programs

COCs,

√ EPD Branch approval to pursue UST RBCA process: July 2016

√ Contract for programmer signed Dec 2016

√ Workbook “delivered” Thanksgiving 2017

√ Revisions & Internal Testing: Dec 2017 – Jan 2018

External stakeholder testing, debugging, review & comments

underway: Feb 2018 - ?


START GRBCA WORKSHEET (TAB)


POPUP DASHBOARD AVAILABLE ALL

WORKBOOK SHEETS

Dashboard Features:

• Access to the guidance document

• Access to help and User Guides for the workbook

• Quick navigation tools

• Printing

• Reset

• Contact EPD

• The compare COCs to RBTLs button


INTEGRATED SUPPORT RESOURCES: QUICK HELP ICONS, QUICK GUIDE

Quick Help icons:

Most worksheet Item #s

Quick Guide icons:

Each worksheet banner

User Guides:

Dashboard


CALENDAR

If you click in any date cell, a

calendar will pop up and you’ll

be able to choose a date. You

can also type in a date if you

wish.

The “Date Selection History

Table” allows you to choose a

date you selected previously.


Area of Concern

User

enters/selects

site & release

information:

-GW usage

-fuel released

-path./receptors

-VI distances

Workbook

selects COCs &

creates tables

User enters soil

& GW results

Workbook

compares Max

COC levels to

RBTLs for

pass/fail

Publishes results

tables

Compare COC

Concentrations to RBTLs

Create COC & RBTL Tables


THE RBTL REPORT SHEET (THE FOUNDATION)


AOC- Area of Concern (Contaminated Area)

AOPC- Area of Potential Concern (Threatened Area)

THE RBTL REPORT SHEET SECTION 6


THE RBTL REPORT SHEET SECTION 7


SOIL DATA

Soil VI Evaluation?

Soil Benzene Table

imports:

&

Direct Exposure Table

imports(Soil to GW Leaching)


THE RBTL REPORT SHEET SECTION 9: GROUNDWATER DATA

No Soil VI Evaluation?

Soil VI Table not

imported


THE RBTL REPORT SHEET SECTION 9: GROUNDWATER DATA


THE RBTL REPORT SHEET SECTION 11: RESULTS!

Two Soil VI

Results Tables:

Results compared as they soil data was

entered

Results Summary compressed by grid

zone


THE RBTL REPORT SHEET SECTION 11: RESULTS!

Results Tables:

Max Soil COC Values

(direct exposure)

Compared to RBTLs

Max GW COC Values

Compared to RBTLs


Area of Concern

User

enters/selects

site & release

information:

-GW usage

-fuel released

-path./receptors

-VI distances

Workbook

selects COCs &

creates tables

User enters soil

& GW results

Workbook

compares Max

COC levels to

RBTLs for

pass/fail

Publishes results

tables

Compare COC



Area of Concern

User

enters/selects

predominant soil

classes, GW &

free

product depths

Workbook

calculates AOC

GW VI SSTLs

Workbook

compares GW

Max COC levels

to SSTLS for

pass/fail &

publishes results

table

Calculate AOC SSTL &

Compare COC Concs.


AOC SSTL REPORT- SECTION 1


AOC SSTL REPORT- SECTION 3- RESULTS!


WORKBOOK GW BENZENE VI OUTPUTS


Area of Concern

User

enters/selects

site & release

information:

-GW usage

-fuel released

-path./receptors

-VI distances

Workbook

selects COCs &

creates tables

User enters soil

& GW results

Workbook

compares Max

COC levels to

RBTLs for

pass/fail

Publishes results

tables

Compare COC



Area of Concern

User

enters/selects

predominant soil

classes, GW &

free

product depths

Workbook

calculates AOC

GW VI SSTLs

Workbook

compares GW

Max COC levels

to SSTLS for

pass/fail &

publishes results

table


Compare COC Concs.

Area of Potential

Concern

User enters

Domenico Model

parameters,

receptor distances

to AOC MW Cmax and

AOPC MWNR with

detectable COCs &

enters MWNR data

not populated

Workbook: Calculates

GW levels at each

receptor from

MW Cmax & MWNR

Compares to RBTLs

for pass/fail

Back calculates

source concentration

protective of receptor

Determines most at

risk receptor

Publishes results

tables

Calculate AOPC SSTL &

Compare COC Concs.


AOPC SSTL REPORT- SECTION 1 A


AOPC SSTL REPORT- SECTION 1 B & C


AOPC SSTL REPORT- SECTION 1 D & E


AOPC SSTL REPORT- SECTION 2





Area of Concern

User

enters/selects

predominant soil

classes, GW &

free

product depths

Workbook

calculates AOC

GW VI SSTLs

Workbook

compares GW

Max COC levels

to SSTLS for

pass/fail &

publishes results

table

Area of Concern

User

enters/selects

site & release

information:

-GW usage

-fuel released

-path./receptors

-VI distances

Workbook

selects COCs &

creates tables

User enters soil

& GW results

Workbook

compares Max

COC levels to

RBTLs for

pass/fail

Publishes results

tables

Compare COC



AOC & AOPC

No data entry

Report displays

all VI information

entered in

workbook for:

AOC Structure

AOPC Residence

AOPC

Nonresidence

Workbook

determines

applicable GW VI

Screening depth

Publishes

recommendation

s for each

structure


Compare COC Concs.

Area of Potential

Concern

User enters

Domenico Model

parameters,

receptor

distances to AOC

MW Cmax and

AOPC MWNR with

detectable COCs


GW levels at each

receptor from

MW Cmax & MWNR

Compares COCs to

RBTLs for pass/fail

Back calculates

source concen.

protective of

receptor

Determines most at

risk receptor and

publishes results


Compare COC Concs.



Area of Concern

User

enters/selects

predominant soil

classes, GW &

free

product depths

Workbook

calculates AOC

GW VI SSTLs

Workbook

compares GW

Max COC levels

to SSTLS for

pass/fail &

publishes results

table

Area of Concern

User

enters/selects

site & release

information:

-GW usage

-fuel released

-path./receptors

-VI distances

Workbook

selects COCs &

creates tables

User enters soil

& GW results

Workbook

compares Max

COC levels to

RBTLs for

pass/fail

Publishes results

tables

Compare COC



AOC & AOPC

No data entry

Report displays

all VI information

entered in

workbook for:

AOC Structure

AOPC Residence

AOPC Nonres

Workbook

determines

applicable GW VI

Screening depth

Publishes

recommendation

s for each

structure

AOC & AOPC

No data entry

Workbook

determines

applicable AOC

GW Alternate

Concen-ration

Limit (ACL) for

each COC

Compares GW VI

Screening depth

to GW depth

range

Identifies soil

COC fails from

RBTL evaluation


Compare COC Concs.

Area of Potential

Concern

User enters

Domenico Model

parameters,

receptor

distances to AOC

MW Cmax and

AOPC MWNR with

detectable COCs


GW levels at each

receptor from

MW Cmax & MWNR

Compares COCs to

RBTLs for pass/fail

Back calculates

source concen.

protective of

receptor

Determines most at

risk receptor and

publishes results


Compare COC Concs.


VI SUMMARY REPORT



QUESTIONS?

Please email any post SESVI meeting comments,

questions and concerns ASAP to:

Shanna Alexander

[email protected]

Telephone: 404-657-8658

Steven Wilson

[email protected]

Telephone: 404-362-4528

Jay Kemberling

[email protected]

Telephone: 404-362-2577

Ron Wallace, retired

[email protected]

Telephone: 770-630--6020

mailto:[email protected]




Documents

Georgia Risk-based Corrective Action (GRBCA)