1 

## P **ROPOSED** 

## A **DDITION** 

## O **F** 

## A **S UBSURFACE**  

## I **NTRUSION** 

## C **OMPONENT** 

## T **O** 

## T **HE** 

## H **AZARD**



## R **ANKING** 

## S **YSTEM**



### Cross Index of Topics Covered in the **Preamble , Proposed Rule and Technical Support Document** 

As of January 26 , 2016

The following table is provided to serve as an aid for reviewing and providing comments on the proposed addition

of a subsurface intrusion component to the Hazard Ranking System (HRS). The table is organized by key

background, policy and technical topics a ssociated with the proposed rule and the evaluation of sites using the

proposed addition. The topics are referenced in the 2 main documents that support this proposed rule: the Federal

Register Notice, which includes the preamble to the proposed rule and t he proposed rule; and the Technical

Support Document (TSD). Both documents are located in the docket for this proposed rule accessible electronically

on Regulations.gov, docket number EPA

- HQ

- SFUND

- 2010

- 1086. EPA is seeking comments on the addition of the

s ubsurface intrusion component to the HRS. Comments on unmodified parts of the HRS are not being requested

and responses to such comments will not be provided if submitted.

**Topic Section(s)** 

BACKGROUND AND POLICY S ECTIONS

The purpose for proposing a subsurface intrusion (SsI)

component to the Hazard Ranking System (HRS) Preamble : III.A

TSD : 1.3.a, 1.4

HRS purpose and the Superfund Site Assessment Process Preamble : IV.A

TSD : 2.1.a.i

Alternatives considered

sites for addressing subsurface intrusion Preamble : V.A.1, V. A. 2

TSD : 2.1.b

, 2.2.b , 3.2, 3.3

Approach for including a subsurface

HRS intrusion component in the Preamble : V.A

TSD : 2.1.c

Proposed HRS structure modification Preamble : V. B .2

TSD : 2.2. b. v , 2.2.c

Ground w ater i ntrusion Preamble: III.A

TSD: Appendix F

PROPOSED SSI RULE TECHNICAL SECTIONS (Non

- radioactive substances)

Definitions Preamble: VI.B.1

Proposed Rule: 1.1

Terminology Updates Preamble: VII.B

Proposed Rule: 2.4.1.1

TSD: 9.0

Eligible Hazardous Substances Proposed Rule: 2.2.2, 5.2.0, 5.2.1.1.1, 5.2.1.1.2

TSD: 5.0, 6.1.b.i, 6.1.b.ii

Delineation of Areas of Subsurface Intrusion Preamble: VI.B.2

Proposed Rule: 5.2.0

TSD: 6.1.b.i, 6.1.b.ii, 6.3

Likelihood of Exposure Preamble: VI.B.2

Proposed Rule: 5.2.1.1

TSD: 4.0

Observed Exposure Preamble: VI.B.3.a2 **Topic Section(s)** 

Proposed Rule: 5.2.1.1.1

TSD: 4.2

• Observed Exposure by Direct Observation Preamble: VI.B.3.a.i

Proposed Rule: 5.2.1.1.1

TSD: 4.2.a

• Observed Exposure by Chemical Analysis Preamble: VI.B.3.a.ii

Proposed Rule: 5.2.1.1.1

TSD: 4.2.b

• Ground water Intrusion Observed Exposure Preamble: VI.B.3.a .i

, VI.B.5.a.i

Proposed Rule: 5.2.1. 1

. 1

TSD: 4.3.d.v, Figure 6

- 2, Figure 6

- 9

Potential for Exposure Preamble: VI.B.3.b

Proposed Rule: 5.2.1.1.2

TSD: 4.3

• Structure Containment Preamble: VI.B.3.b.i

Proposed Rule: 5.2.1.1.2.1

TSD: 3.4, 4.3.c

• Route Characteristics Preamble: VI.B.3.b.ii

Proposed Rule: 5.2.1.1.2

TSD: 4.3.b, 4.3.d

• Depth to Contamination Preamble: VI.B.3.b.ii.a

Proposed Rule: 5.2.1.1.2.2

TSD: 3.4, 4.3.b, 4.3.d, 4.3.d.i

• Vertical Mi gration Preamble: VI.B.3.b.ii.b

Proposed Rule: 5.2.1.1.2.3, 5.2.1.1.2.4

TSD: 3.4, 4.3.d, 4.3.d.ii

• Vapor Migration Potential Preamble: VI.B.3.b.ii.c

Proposed Rule: 5.2.1.1.2.4

TSD: 4.3.d, 4.3.d.iii

• Calculation of the Potential for Exposure Factor Value Preamble: VI.B.3.b.iii

Proposed Rule: 5.2.1.1.2.5

TSD: 4.3.d.vi

**Waste Characteristics**

Toxicity Preamble: VI.B.4.a

Proposed Rule: 5.2.1.2.1.1

TSD: 5.1.a

Degradation Preamble: VI.B.4.a

Proposed Rule: 5.2.1.2.1.2

TSD: 5.1.b

Hazardous Waste Quantity Preamble: VI.B.4.b

Proposed Rule: 5.2.1.2.23 **Topic Section(s)** 

TSD: 5.3, 5.3.a, 5.3.b, 5.3.c

Calculation of the Waste Characteristics Factor Category Value Preamble: VI.B.4.c

Proposed Rule: 5.2.1.2.3

TSD: 5.6

**Targets**

Delineation of Target Areas Preamble : VI.B.2, VI.B.5

Proposed Rule: 5.2.1.3

TSD: 6.1 , 6.1.b.i, 6.1.b.ii

Eligible Targets Preamble: VI.B.5.a

Proposed Rule: 5.2.1.3

TSD: 6.2

Exposed Individual/Levels of Exposure Preamble: VI.B.5.b , VI.B.5.b.i, VI.B.5.b.ii

Proposed Rule: 5.2.1.3.1

TSD: 6.3.a

Evaluation of Populations within Target Areas Preamble: VI.B.5. c , VI.B.5. c .i, VI.B.5. c .ii

Proposed Rule: 5.2.1.3.2, 5.2.1.3.2.1,

5.2.1.3.2.2, 5.2.1.3.2.3

TSD: 6.3. b, 6.3.b.i, 6.3.b.ii

Resources Preamble: VI.B.5.d

Proposed Rule: 5.2.1.3.3

TSD: 6.3.c

**Calculation of SsI Component Score** Preamble: VI.B.6.a

Proposed Rule: 5.2.2

**Calculation of Site Score** Preamble: VI.B.6.c

Proposed Rule: 2.1.1

PROPOSED SSI RULE TECHNICAL SECTIONS ( Radioactive Substances)

**Sites Containing Radioactive Substances**  Proposed Rule: 7.0

Likelihood of Exposure Proposed Rule: 7.1

• Observed Exposure Proposed Rule: 7.1.1

• Potential for Exposure Proposed Rule: 7.1.2

Waste Characteristics

• Degradation Proposed Rule: 7.2.3

TSD: 5.1.b

• Hazardous Waste Quantity Proposed Rule: 7.2.5.1

, 7.2.5.2, 7.2.5.3

TSD: 5.3.d

Targets Proposed Rule: 7.3

TSD: 6.3.d

• Exposed Individual/Levels of Exposure Proposed Rule: 7.3.2

TSD: 6.3.d