MIXING ZONES - Montana Legislature

MIXING ZONES

Allowing Nature to Assist with Cleanup

M illio n s o f D o lla rs CPI vs. Fund Revenue

$8

CPI

$7

$6 Fund Revenue

$5
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010

Fiscal Year

RECENTLY ENACTED
COST-CUTTING MEASURES

1. Site Prioritization
2. Reasonable Costs
3. Reduced Monitoring
4. Special Study Funding
5. Incentive for Owners to Utilize

Insurance
6. Subrogation Program

RATIONALE FOR GROUNDWATER
MIXING ZONES

1. Utilize Existing Laws
2. Keep Property on Tax Roles
3. Maintain Petro Fund Solvency

RATIONALE

Utilize • Residential Septic
Existing Laws Systems

• Public WWTP

• Mining – Mike Horse
Mine

• Industrial Discharges

- Smurfitt-Stone

- Plum Creek – C. Falls

RATIONALE

Utilize • Meet SBA Loan
Existing Laws Requirements

Continue • Enhance Commercial
Property on Property Refinancing
Tax Roles

U.S. Small Business Administration
Office of Financial Assistance

III. ENVIRONMENTAL POLICIES AND PROCEDURES
These environmental policies and procedures apply to all 504 loans.

G. Approval and Disbursement of loans when there is Contamination or
Remediation at the Property
4. Mitigating Factors

SBA will rely upon one or more of the following factors when deciding to
disburse before completion of Remediation or monitoring:

“No Further Action”. If a CDC obtains a “no further action
letter” or “closure letter” from a Governmental Entity stating
that no further Remediation or monitoring of Contamination
previously found is required, approval or disbursement may be
considered.

RATIONALE

Utilize • Fund Solvency
Existing Laws
• Stimulate the
Continue Economy
Property on
Tax Roles

Maintain
Solvency of
Petro Fund

SEPTIC SYSTEM MIXING ZONE

GROUND WATER FLOW 100-500 Feet
Level II
STWS Nitrate POINT OF
COMPLIANCE
MIXING ZONE 7.5 mg/L WITH NONDEG
OR WATER
QUALITY
STANDARD

5°

DRAINFIELD

GROUND WATER MIXING ZONE

Drainfield

WATER TABLE

GROUND WATER FLOW

Mixing Zone

WATER TABLE

GROUND WATER FLOW

Plume Monitoring Compliance Compliance Well
Wells Well (Vertical) (Horizontal)

Removed
Source

Water Table

Ground Water Flow

KEY CONSIDERATIONS

● Contaminated groundwater is not
and will not be used for drinking
water

● Source removal has been
accomplished

● Chemical concentrations will
decrease over time

Elmer’s Great Falls

$210,000

10th Ave. South

Motel ELMERS Former Tank
Basin
Boring
Monitoring Wells (estimated)

Groundwater Mixing Zone
Application Guidance
South Carolina

May 1, 1997

SUMMARY

● DEQ has a Policy in Place
● Implementation Would

Stimulate Economy
● Maintain Fund Solvency

THANK YOU

● Comments?

● Concerns?
● Questions?