40318 Federal Register / Vol. 77, No. 131 / Monday, July 9, 2012 / Proposed Rules 

To provide an opportunity for 

questions and discussion, EPA will hold 

an open house prior to the public 

hearing. During this open house, EPA 

staff will be available to informally 

answer questions on our proposed rule. 

Any comments made to EPA staff 

during the open house must still be 

provided formally in writing or orally 

during the public hearing in order to be 

considered in the record. 

The public hearing will provide the 

public with an opportunity to present 

data, views, or arguments concerning 

the proposed Regional Haze action for 

Arizona. EPA may ask clarifying 

questions during the oral presentations, 

but will not respond to the 

presentations at that time. Simultaneous 

translation in Spanish will be available 

during the public hearing. Written 

statements and supporting information 

submitted during the comment period 

will be considered with the same weight 

as any oral comments and supporting 

information presented at the public 

hearing. Please consult the proposed 

rule for guidance on how to submit 

written comments to EPA. 

At the public hearing, the hearing 

officer may limit the time available for 

each commenter to address the proposal 

to five minutes or less if the hearing 

officer determines it is appropriate. Any 

person may provide written or oral 

comments and data pertaining to our 

proposal at the public hearing. We will 

include verbatim transcripts, in English, 

of the hearing and written statements in 

the rulemaking docket. 

List of Subjects in 40 CFR Part 52 

Environmental protection, Air 

pollution control, Incorporation by 

reference, Intergovernmental relations, 

Nitrogen oxides, Sulfur dioxide, 

Particulate matter, Reporting and 

recordkeeping requirements, Visibility, 

Volatile organic compounds. 

Dated: June 27, 2012. 

Deborah Jordan, 

Air Division Director, Region IX. 

[FR Doc. 2012–16705 Filed 7–6–12; 8:45 am] 

BILLING CODE 6560–50–P 

ENVIRONMENTAL PROTECTION 

AGENCY 

40 CFR Part 300 

[EPA–HQ–SFUND–2011–0647; FRL–9697–5] 

RIN 2050–AD75 

Availability of Addendum to 

Documentation Supporting the 

Proposal of the Leeds Metal Site to the 

National Priorities List 

AGENCY: Environmental Protection 

Agency. 

ACTION: Proposed rule; notice of data 

availability. 

SUMMARY: This Notice provides an 

opportunity to comment on the EPA’s 

revised Hazard Ranking System (HRS) 

scoring for the Leeds Metal site in 

Leeds, Maine. The site was proposed to 

the National Priorities List (NPL) on 

September 16, 2011. 

DATES: Comments must be submitted 

(postmarked) on or before August 8, 

2012. 

ADDRESSES: Submit your comments, 

identified by Docket number EPA–HQ– 

SFUND–2011–0647, by one of the 

following methods: 

• www.regulations.gov: Follow the 

online instructions for submitting 

comments. 

• Email: superfund.docket@epa.gov. 

• Mail: Mail comments (no facsimiles 

or tapes) to Docket Coordinator, 

Headquarters; U.S. Environmental 

Protection Agency; CERCLA Docket 

Office; (Mail Code 5305T); 1200 

Pennsylvania Avenue NW.; Washington, 

DC 20460. 

• Hand Delivery or Express Mail: 

Send comments (no facsimiles or tapes) 

to Docket Coordinator, Headquarters; 

U.S. Environmental Protection Agency; 

CERCLA Docket Office; 1301 

Constitution Avenue NW.; EPA West, 

Room 3334, Washington, DC 20004. 

Such deliveries are accepted only 

during the Docket’s normal hours of 

operation (8:30 a.m. to 4:30 p.m., 

Monday through Friday, excluding 

Federal holidays). 

Instructions: Direct your comments to 

Docket number EPA–HQ–SFUND– 

2011–0647. The EPA’s policy is that all 

comments received will be included in 

the public Docket without change and 

may be made available online at 

www.regulations.gov, including any 

personal information provided, unless 

the comment includes information 

claimed to be Confidential Business 

Information (CBI) or other information 

whose disclosure is restricted by statute. 

Do not submit information that you 

consider to be CBI or otherwise 

protected through www.regulations.gov 

or email. The www.regulations.gov Web 

site is an ‘‘anonymous access’’ system; 

that means the EPA will not know your 

identity or contact information unless 

you provide it in the body of your 

comment. If you send an email 

comment directly to the EPA without 

going through www.regulations.gov, 

your email address will be 

automatically captured and included as 

part of the comment that is placed in the 

public Docket and made available on 

the Internet. If you submit an electronic 

comment, the EPA recommends that 

you include your name and other 

contact information in the body of your 

comment and with any disk or CD–ROM 

you submit. If the EPA cannot read your 

comment due to technical difficulties 

and cannot contact you for clarification, 

the EPA may not be able to consider 

your comment. Electronic files should 

avoid the use of special characters, any 

form of encryption, and be free of any 

defects or viruses. 

Docket: All documents in the docket 

are listed in the www.regulations.gov 

index. Although listed in the index, 

some information is not publicly 

available, e.g., CBI or other information 

whose disclosure is restricted by statute. 

Certain other material, such as 

copyrighted material, will be publicly 

available only in hard copy. Publicly 

available docket materials are available 

either electronically in 

www.regulations.gov or in hard copy at 

the EPA Headquarters CERCLA Docket 

Office, 1301 Constitution Avenue NW.; 

EPA West, Room 3334, Washington, DC 

20004. The Public Reading Room is 

open from 8:30 a.m. to 4:30 p.m., 

Monday through Friday, excluding legal 

holidays. The telephone number for the 

Public Reading Room is (202) 566–1744, 

and the telephone number for the EPA 

Headquarters CERCLA Docket Office is 

(202) 566–0276. Comments must be 

submitted to the EPA Headquarters as 

detailed at the beginning of this 

preamble in the ‘‘Addresses’’ section. 

Please note that the mailing addresses 

differ according to method of delivery. 

There are two different addresses that 

depend on whether comments are sent 

by express mail or by postal mail. 

FOR FURTHER INFORMATION CONTACT: 

Terry Jeng, phone: (703) 603–8852, 

email: jeng.terry@epa.gov, Site 

Assessment and Remedy Decisions 

Branch, Assessment and Remediation 

Division, Office of Superfund 

Remediation and Technology 

Innovation (Mail Code 5204P), U.S. 

Environmental Protection Agency, 1200 

Pennsylvania Avenue NW., Washington, 

DC 20460. 


sroberts on DSK5SPTVN1PROD with PROPOSALS
Federal Register / Vol. 77, No. 131 / Monday, July 9, 2012 / Proposed Rules 40319 

SUPPLEMENTARY INFORMATION: 

Site Scoring Information 

The Leeds Metal HRS site score at the 

time of proposal to the National 

Priorities List was based on an observed 

release to ground water of 

tetrachloroethylene (PCE) and 

trichloroethylene (TCE) attributable to 

waste piles and contaminated soil at the 

Leeds Metal facility resulting in a 

likelihood of release factor category 

value of 550. The waste characteristics 

factor category value of 56 at proposal 

was based on a hazardous waste 

quantity for TCE of 10,000, a toxicity 

value for TCE of 10,000 and a mobility 

factor for TCE of 1. The TCE toxicity 

value was based on the most recent 

health effects data review by the EPA at 

the time of proposal (76 FR 57702, 

September 16, 2011). 

The targets factor category value was 

176.4 at proposal based on populations 

relying on contaminated drinking water 

supplies with either PCE or TCE levels 

above HRS health-based benchmarks 

(i.e., Level I concentrations). Seven 

residential wells were documented to 

contain Level I concentrations of TCE 

based on the lowest benchmark value 

for TCE for ground water. One of these 

seven wells was also documented to 

contain Level I concentrations of PCE 

based on the lowest benchmark value 

for TCE for ground water. The lowest 

benchmark for TCE was the cancer slope 

screening concentration (0.21 mg/L) and 

the lowest benchmark for PCE was also 

the cancer slope screening 

concentration (1.6 mg/L) based on the 

most recent health effects data review 

by the EPA at the time of proposal. 

Seventeen residents were documented 

to drink the water from the seven wells 

with Level I concentrations. The 

likelihood of release, waste 

characteristics and targets factor 

category values resulted in a ground 

water migration pathway score of 100.00 

and an HRS site score of 50.00 at 

proposal (see 76 FR 57702, September 

16, 2011). 

Background on TCE and PCE 

Benchmarks and Toxicity Values 

Following the September 16, 2011, 

proposal of the Leeds Metal site to the 

National Priorities List, the toxicity and 

benchmark values for PCE and TCE 

used in HRS scoring were updated to 

reflect the EPA’s most recent health 

effects evaluations on these two 

substances. The revisions for these two 

substances were made available to the 

public on March 31, 2012 (see http:// 

www.epa.gov/superfund/sites/npl/ 

hrsres/tools/scdm.htm). Among the 

factors that changed, which affect the 

toxicity and drinking water benchmarks, 

are the oral reference dose (RfD) and the 

oral cancer slope factors. Using the HRS 

methods for determining toxicity and 

benchmarks (see HRS Sections 2.4.1.1 

and 2.5.2), the toxicity for TCE has 

changed from 10,000 to 1,000, however 

the toxicity for PCE remains the same at 

100. When recalculating the drinking 

water benchmarks for TCE, the lowest 

TCE benchmark value for drinking 

water remains based on the cancer slope 

screening concentrations; the 

recalculated TCE benchmark value 

changes from 0.21 mg/L to 1.0 mg/L. The 

lowest drinking water benchmark for 

PCE changes from 1.6 mg/L to 5.0 mg/L. 

Background on Targets Factor Category 

Value 

Based on the changes to the TCE and 

PCE benchmarks, two drinking water 

wells within the 4-mile target distance 

limit have TCE concentrations above its 

lowest benchmark and no well had PCE 

concentrations above its lowest 

benchmark. Thus, now only two wells 

and the population using these wells are 

considered Level I. 

The Leeds Metal site’s potential 

population factor value has been 

updated to reflect those people utilizing 

drinking water not currently found to be 

contaminated due to this site, but that 

for HRS purposes are considered 

potentially threatened. The basic 

information supporting the calculation 

of this value was presented in Reference 

11 which was available to the public at 

the time of NPL proposal; however, the 

factor value was not included in the 

HRS documentation record at that time. 

Populations utilizing either public or 

private water supplies have been 

incorporated into the HRS evaluation 

based on the information in Reference 

11 to the HRS documentation record at 

proposal, which relied on 1990 and 

2000 census data and 2009 population 

data from the State of Maine. The 

impact on eligibility of the site to 

qualify for the NPL has been confirmed 

based on the most current information, 

including updated census data (2010) 

and 2012 well use information. 

New Benchmarks, Toxicities, Targets 

and Site Score 

Due to the revised toxicity values and 

the update to the evaluation of the 

potential targets, the likelihood of 

release factor category value remains 

550, the same as at proposal; the waste 

characteristics factor category value, 

which was 100 at proposal, drops to 56 

due to the changes in the Level I wells; 

the potential population factor value, 

the applicable targets factor category 

value, changes from 220 to 176.4. As a 

result of these updates, the HRS ground 

water migration pathway score changes 

from 100.00 to 65.85; and the HRS site 

score changes from 50.00 to 32.92. The 

NPL listing decision is not changed by 

this updated information and scoring. 

The updated HRS scoring 

documentation is available in 

www.regulations.gov under docket 

number EPA–HQ–SFUND–2011–0647. 

List of Subjects in 40 CFR 300 

Environmental protection, Air 

pollution control, Chemicals, Hazardous 

substances, Hazardous waste, 

Intergovernmental relations, Natural 

resources, Oil pollution, Penalties, 

Reporting and recordkeeping 

requirements, Superfund, Water 

pollution control, Water supply. 

Dated: June 29, 2012. 

James E. Woolford, 

Director, Office of Superfund Remediation 

and Technology Innovation. 

[FR Doc. 2012–16692 Filed 7–6–12; 8:45 am] 

BILLING CODE 6560–50–P 


sroberts on DSK5SPTVN1PROD with PROPOSALS