Enbridge Line 6B MP 608

Marshall, Michigan Pipeline Release

Pipeline Trench Backfill Plan

August 17, 2010

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UNAFFECTED TRENCH BACKFILLING (WEST PORTION)

OBJECTIVES

The Company has developed objectives for the backfill operations at the repair trench in the

leak source area to meet necessary response objectives. The western portion of the excavation

was created for the purposes of complying with the PHMSA Order, and was not associated with

the response. The objectives of the backfilling plan in this unaffected area are;

• Delineate a demarcation point within the excavation between the affected and

unaffected areas to facilitate immediate backfilling of the unaffected excavation, and

• Backfill excavation in accordance with pipeline specifications.

Backfilling the excavation will need to be performed in a number of sequential steps. In

summary, this portion of the excavation is outside of the area affected by the leak and would be

backfilled with clean imported material.

IMPACT DEMARCATION

A visual assessment of the trench will be conducted to determine an apparent demarcation point between the affected and unaffected areas. Adjacent to this location within the unimpacted area, three soil samples will be collected from the existing excavation. One soil sample will be collected from the floor of the excavation, and one soil sample from each of the two sidewalls. These soil samples will be analyzed by the on-site mobile laboratory for analysis of benzene, toluene, ethylbenzene, xylenes, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, naphthalene, 2-methylnapthalene (VOCs) and polynuclear aromatic hydrocarbons (PNAs). These results will be compared to Part 201 Criteria. If all analyzed parameters are less than Part 201 Criteria, the unaffected portion (west) of the excavation will be immediately backfilled following the procedures below.

SAMPLING RESULTS

The impact demarcation sampling outlined above was conducted on August 17, 2010 as outlined above.

HA-35 North Wall at 2 feet below ground surface

HA-36 Immediately below the pipeline at approximately 8 feet below ground surface

HA-37 South Wall at 2 feet below ground surface

In reviewing these results, HA-36 and HA-37 showed no detectable concentrations. HA-35 exhibited a benzene concentration significantly below Part 201 Criteria for Csat and leaching to groundwater protective of groundwater/surface water interface. It is only slightly above leaching to groundwater criteria for drinking water. See the Table below:

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Table - Summary of Laboratory Analytical Results - Soil VOCs and PNAs Part 201 Generic Cleanup Criteria Sample ID HA-35 HA-36 HA-37

Sample Depth 2' bgs 8' bgs 2' bgs Date of Collection 8/17/2010 8/17/2010 8/17/2010 Date of Extraction 8/17/2010 8/17/2010 8/17/2010

Chemical Abstract Service Number

MDNRE OP

Memo 2 TDL

Drinking Water

Protection

Groundwater Surface Water

Interface Protection

Soil Volatilization to Indoor Air Inhalation

Direct Contact

Soil Saturation

Concentration Screening

Levels Date of Analysis 8/17/2010 8/17/2010 8/17/2010 VOCs

71432 50 100 4,000 (X) 1,600 180,000 400,000 Benzene (I) 110 ND ND 100414 50 1,500 360 87,000 140,000 (C) 140,000 Ethylbenzene (I) ND ND ND 91756 330 57,000 ID ID 8,100,000 NA 2-Methylnaphthalene ND ND ND 91203 330 35,000 870 250,000 16,000,000 NA Naphthalene ND ND ND 108883 100 16,000 2,800 250,000 (C) 250,000 (C) 250,000 Toluene (I) 68 ND ND 95636 100 2,100 570 110,000 (C) 110,000 (C) 110,000 1,2,4-Trimethylbenzene (I) ND ND ND 108678 100 1,800 1,100 94,000 (C) 94,000 (C) 94,000 1,3,5-Trimethylbenzene (I) ND ND ND

PNAs

83329 330 300,000 4,400 190,000,000 4,100,000 NA Acenaphthene ND ND ND

208968 330 5,900 ID 1,600,000 1,600,000 NA Acenaphthylene ND ND ND

120127 330 41,000 ID 1,000,000,000 (D) 230,000,000 NA Anthracene ND ND ND

56553 330 NLL NLL NLV 20,000 NA Benzo(a)anthracene (Q) ND ND ND

205992 330 NLL NLL ID 20,000 NA Benzo(b)fluoranthene (Q) ND ND ND

207089 330 NLL NLL NLV 200,000 NA Benzo(k)fluoranthene (Q) ND ND ND

191242 330 NLL NLL NLV 2,500,000 NA Benzo(g,h,i)perylene ND ND ND

50328 330 NLL NLL NLV 2,000 NA Benzo(a)pyrene (Q) ND ND ND

218019 330 NLL NLL ID 2,000,000 NA Chrysene (Q) ND ND ND

53703 330 NLL NLL NLV 2,000 NA Dibenzo(a,h)anthracene (Q) ND ND ND

206440 330 730,000 5,500 1,000,000,000 (D) 46,000,000 NA Fluoranthene ND ND ND

86737 330 390,000 5,300 580,000,000 27,000,000 NA Fluorene ND ND ND

193395 330 NLL NLL NLV 20,000 NA Indeno(1,2,3-cd) pyrene (Q) ND ND ND

91576 330 57,000 ID NLV 8,100,000 NA 2-Methylnaphthalene ND ND ND

91203 330 35,000 870 250,000 16,000,000 NA Naphthalene ND ND ND

85018 330 56,000 5,300 2,800,000 1,600,000 NA Phenanthrene ND ND ND

129000 330 480,000 ID 1,000,000,000 (D) 29,000,000 NA Pyrene ND ND ND

Notes: All results are presented in parts-per-billion (µg/kg-dry) NA - Not Applicable or Not Available ND - Not Detected Criteria has been met or exceeded/Result meets or exceeds Criteria

In combination with no data, indicates that the sample was not analyzed for the constituent.

Analytical Method EPA 8260 and 8270

3

BACKFILL

Native material, currently stock piled adjacent to the excavation will be used to backfill the

excavation to surface grade. The backfill will be completed in accordance with Enbridge O&MP

Book 3: 04-02-03. No permitting or special considerations are required for this section of the

excavation.

REQUEST FOR APPROVAL TO BACKFILL THE UNAFFECTED TRENCH

Based on the laboratory results associated with the impact demarcation, the Company requests

approval to backfill the unaffected portion of the excavation immediately.

AFFECTED TRENCH BACKFILLING (EAST PORTION)

OBJECTIVES

The Company has developed objectives for the backfill operations at the repair trench in the leak source area to meet necessary response objectives. Backfilling of this excavation is necessary to proceed with further response excavation activities in the immediate vicinity of the sheet pile. The objectives of the backfilling plan in this affected area are;

• Conduct in-place gross decontamination of sheet pile,

• Excavate additional visually impacted soil from the bottom of the excavation, removing

groundwater as necessary to conduct excavation,

• Backfill excavation in accordance with pipeline specifications, and

• Conduct verification sampling to evaluate compliance with Part 201 Criteria. This

information will become part of the decision factors to determine whether further

remedial actions will be necessary.

Backfilling the excavation will need to be performed in a number of sequential steps. The intent would be to ensure that the excavation is free of free phase oil; as free from impacted material as possible; and then backfill with clean imported material.

SHEET PILE DECONTAMINATION

The interior portion of the sheet pile has visible remnants of oil present. Gross decontamination will be conducted through manual scraping methods and washing methods. The material will be removed from the excavation and disposed as specified in the Waste Treatment, Transportation, and Disposal Plan.

ADDITIONAL EXCAVATION AT 6B

As of August 16, 2010, the excavation at the source area is 16-feet wide by 182-feet long, and ranging from 8-feet to 12-feet deep within a sheet pile trench box. Much of this excavation is outside of the area of impact. The steel sheet piles extend to an approximate depth of 28 feet below ground surface. The excavation currently extends several feet below the static groundwater surface and is being dewatered with a series of pumping wells and/or vac trucks.

4

At this time, the extracted water is being containerized in frac tanks with other liquids collected during response activities along the Kalamazoo River.

The bottom of the excavation is currently covered with crushed stone to provide stability for workers conducting pipeline repair.

Work shall commence by excavating the crushed stone and the remaining visually impacted soils within the sheet pile. Limitations will exist on the structural integrity of the sheet pile and therefore excavation will not proceed to such a depth as would exceed the safety limit of the 4 existing sheet piling without an alternative plan in place. The excavated soil will be handled and disposed as specified in the Waste Treatment, Transportation, and Disposal Plan.

During backfilling, representatives will be on-site to observe and document the condition of the bottom of the excavation during these activities. This additional excavation is intended to remove the remaining impacted soil.

VERIFICATION OF CLEANUP

This verification of cleanup section is based on a conversation between Bob Steede of Enbridge and Frank Ballo of the Michigan Department of Natural Resources and Environment on August 18, 2010. This verification approach applies only to the pipeline trench addressed in this Backfill Plan.

After completion of the additional excavation activities above, soil samples will be collected from the floor of the excavation. The floor area within the sheet pile is approximately 3,400 square feet. Following MDNRE guidance, 6 samples are required to be collected for laboratory analysis (for excavation floors between 2,500 and 4,000 square feet). These soil samples will be analyzed by the on-site mobile laboratory for analysis of benzene, toluene, ethylbenzene, xylenes, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, naphthalene, 2-methylnapthalene (VOCs) and polynuclear aromatic hydrocarbons (PNAs). Because these soil samples will be collected from below the water table, the results will be compared only to MDNRE Part 201 Csat Criteria.

If these soil samples exhibit concentrations below Csat Criteria, the Company will backfill the excavation as described below. The results of these soil samples will be used to help aid in future decisions related to long term remedial investigation and/or remedial actions pursuant to Part 201.

BACKFILL

Once all impacted soil has been removed or the excavation has reached the maximum depth possible, imported sand material will be used to backfill against the interior walls of the trench box towards the pipe for approximately 6 ft., but will leave an area 60” wide underneath the pipe. The sand will be brought up to mid-pipe level.

Flowable fill will be used to backfill a width of 60” underneath the pipe. It is expected that the flowable fill will extend from the east end of the trench box for approximately 100 ft. to the west,

5

or the affected/unaffected demarcation point is reached. The flowable fill will be brought up to mid-pipe level.

Sand will be used to backfill the rest of the excavation to a point approximately 2 to 3 ft. below original grade to allow for final site restoration of the area. The backfill will be completed in accordance with Enbridge O&MP Book 3: 04-02-03. No permitting or special considerations are required for this section of the excavation.

6

AFFECTED TRENCH BACKFILLING (EAST PORTION)

OBJECTIVES

The Company has developed objectives for the backfill operations at the repair trench in the

leak source area to meet necessary response objectives. Backfilling of this excavation is

necessary to proceed with further response excavation activities in the immediate vicinity of the

sheet pile. The objectives of the backfilling plan in this affected area are;

• Conduct in-place gross decontamination of sheet pile,

• Excavate additional visually impacted soil from the bottom of the excavation, removing

groundwater as necessary to conduct excavation,

• Backfill excavation in accordance with pipeline specifications, and

• Conduct verification sampling to evaluate compliance with Part 201 Criteria. This

information will become part of the decision factors to determine whether further

remedial actions will be necessary.

Backfilling the excavation will need to be performed in a number of sequential steps. The intent

would be to ensure that the excavation is free of free phase oil; as free from impacted material

as possible; and then backfill with clean imported material.

SHEET PILE DECONTAMINATION

The interior portion of the sheet pile has visible remnants of oil present. Gross decontamination will be conducted through manual scraping methods and washing methods. The material will be removed from the excavation and disposed as specified in the Waste Treatment, Transportation, and Disposal Plan.

ADDITIONAL EXCAVATION AT 6B

As of August 16, 2010, the excavation at the source area is 16-feet wide by 182-feet long, and

ranging from 8-feet to 12-feet deep within a sheet pile trench box. Much of this excavation is

outside of the area of impact. The steel sheet piles extend to an approximate depth of 28 feet

below ground surface. The excavation currently extends several feet below the static

groundwater surface and is being dewatered with a series of pumping wells and/or vac trucks.

At this time, the extracted water is being containerized in frac tanks with other liquids collected

during response activities along the Kalamazoo River.

The bottom of the excavation is currently covered with crushed stone to provide stability for

workers conducting pipeline repair.

Work shall commence by exavating the crushed stone and the remaining visually impacted soils

within the sheet pile. Limitations will exist on the structural integrity of the sheet pile and

therefore excavation will not proceed to such a depth as would exceed the safety limit of the

7

existing sheet piling without an alternative plan in place. The excavated soil will be handled and

disposed as specified in the Waste Treatment, Transportation, and Disposal Plan.

During backfilling, representative will be on-site to observe and document the condition of the

bottom of the excavation during these activities. This additional excavation is intended to

remove the remaining impacted soil.

VERIFICATION OF CLEANUP

This verification of cleanup section is based on a conversation between Bob Steede of Enbridge

and Frank Ballo of the Michigan Department of Natural Resources and Environment on August

18, 2010. This verification approach applies only to the pipeline trench addressed in this Backfill

Plan.

After completion of the additional excavation activities above, soil samples will be collected from

the floor of the excavation. The floor area within the sheet pile is approximately 3,400 square

feet. Following MDNRE guidance, 6 samples are required to be collected for laboratory

analysis (for excavation floors between 2,500 and 4,000 square feet). These soil samples will

be analyzed by the on-site mobile laboratory for analysis of benzene, toluene, ethylbenzene,

xylenes, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, naphthalene, 2-methylnapthalene

(VOCs) and polynuclear aromatic hydrocarbons (PNAs). Because these soil samples will be

collected from below the water table, the results will be compared only to MDNRE Part 201 Csat

Criteria.

If these soil samples exhibit concentrations below Csat Criteria, the Company will backfill the

excavation as described below. The results of these soil samples will be used to help aid in

future decisions related to long term remedial investigation and/or remedial actions pursuant to

Part 201.

BACKFILL

Once all impacted soil has been removed or the excavation has reached the maximum depth

possible, imported sand material will be used to backfill against the interior walls of the trench

box including under the pipe. Backfill will be completed in lifts no greater than 6” inches and

compacted in accordance with Enbridge O&MP Book 3: 04-02-03. Sand will be used to backfill

the rest of the excavation to a point approximately 2 to 3 ft. below original grade to allow for final

site restoration of the area.

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#2 - Semil'olatile Organics = PAHs, PCp, Dioxins, 8270 Reli~qllished Itlv' On Ice? ' Date Time Received by: Date Time

FIIll List, HerbicidelPesticide/PCBs Y N

#3 - General =pH, Chloride, Fluoride, Alkalinity, 1'SS,1'DS, 1'S, Sulfate Samples Shipped VIA: 0 Air Freight DFederal Express o Sampler Air Bill Number:

#4 - Nll/lients = COD, TOC, Phenols, Ammonia o Other:Nirrogen, TKN ..