Attachment J.11 Excavation and Handling of Contaminated Material.pdf

SIR 693KA8-20-R-00008

ATTACHMENT J.11

EXCAVATION AND HANDLING OF CONTAMINATED MATERIALS

3.0 EXECUTION

3.1 SAMPLING PLAN

Prior to start of work, the Contractor must develop, and submit to the RE for review and approval, a sampling plan. The sampling plan must:

a. assess the need for personal and/or area monitoring;

b. identify Federal, state, and local requirements for clearance;

c. determine the appropriate sampling methodologies;

d. address the credentials of the personnel performing the monitoring; and

e. clarify the credentials of the testing firm(s).

3.2 EXISTING STRUCTURES AND UTILITIES

No excavation must be performed until site utilities have been field located by a third party commercial utility locator. Contracting Officer’s Representative (COR)/Resident Engineer (RE) will coordinate the marking of all utilities in excavation area. The Contractor must take the necessary precautions to ensure no damage occurs to existing structures and utilities. Utilities encountered that were not previously shown or otherwise located must not be disturbed without approval from the RE.

3.3 CLEARING

Clearing must be performed to the limits shown on the drawings or as directed by the RE.

3.4 CONTAMINATED MATERIAL REMOVAL

3.4.1 EXCAVATION

Areas of potential contamination must be excavated to the depth and extent shown on the drawings or as directed by the RE. Excavation must be performed in a manner that will limit spills and the potential for contaminated material to be mixed with uncontaminated material. An excavation log describing visible signs of contamination encountered must be maintained for each area of excavation.

3.4.2 SHORING

If workers must enter the excavation, it must be evaluated, shored, sloped or braced as required by 29 CFR Part 1926, Subpart P, Excavations. The shoring must be approved by a Registered Engineer in accordance with 29 CFR 1926.651.

3.4.3 DEWATERING

Surface water must be diverted to prevent entry into the excavation. Dewatering must be limited to that necessary to assure adequate access, a safe excavation, prevent the spread of contamination, and to ensure that compaction requirements can be met. In the event that the run on waters or in-situ waters may be contaminated these waters shall be containerized and sampled for determination, by the RE, of method of release.

3.5 CONFIRMATION SAMPLING AND ANALYSIS

The RE must be present to inspect the removal of contaminated material from each site. After all material suspected of being contaminated has been removed, the excavation must be examined for evidence of contamination. Field analysis must be used to determine the presence of contamination. As directed by the RE, the Contractor must excavate additional material. After all suspected contaminated material is removed, confirmation samples must be collected and analyzed in accordance with regulatory and permit requirements. The Contract must ensure appropriate Personal Protective Equipment (PPE) is used in the sampling and handling of contaminated materials or where there is the potential for the material to be contaminated. A minimum of one sample must be collected from the bottom of the excavation by an experienced sampling technician and analyzed for contaminants of concern. Based on test results, the Contractor must propose any additional excavation that may be required to remove material which is contaminated above action levels. Additional excavation must be subject to approval by the RE. Locations of samples must be marked in the field and documented on the as-built drawings or provided in a separate report.

3.6 CONTAMINATED MATERIAL STORAGE

Material must be placed in temporary storage immediately after excavation. The following paragraphs describe acceptable methods of material storage. Storage units must be in good condition and constructed of materials that are compatible with the material or liquid to be stored.

If multiple storage units are required, each unit must be clearly labeled with an identification number and a written log must be kept to track the source of contaminated material in each temporary storage unit.

3.6.1 STOCKPILES

Stockpiles must be constructed to isolate stored contaminated material from the environment. The maximum stockpile size must be 200 cubic yards. Stockpiles must be constructed to include:

a. A chemically resistant liner free of holes and other damage. The ground surface on which the liner is to be placed must be free of rocks greater than 0.5 inches in diameter and any other object which could damage the membrane.

b. Cover free of holes or other damage to prevent precipitation from entering the stockpile. The cover material must be extended over the berms and anchored or ballasted to prevent it from being removed or damaged by wind.

c. Berms surrounding the stockpile, a minimum of 8 inches in height. Vehicle access points must also be bermed.

d. The liner system must be sloped to allow collection of leachate. Storage and removal of liquid that collects in the stockpile, must be in accordance with paragraph Liquid Storage.

3.6.2 ROLL-OFF UNITS

Roll-off units used to temporarily store contaminated material must be water tight. A cover must be placed over the units to prevent precipitation from contacting the stored material. Liquid that collects inside the units must be removed and stored in accordance with paragraph Liquid Storage.

3.6.3 LIQUID STORAGE

Liquid collected from excavations and stockpiles must be temporarily stored in polyethylene drums or tanks, as appropriate and provided by the contractor. Liquid storage containers must be water-tight and must be located near the stockpile areas.

3.7 SAMPLING

3.7.1 SAMPLING OF SOLID MATERIAL

Samples of stored material must be collected at a frequency sufficient to meet the requirements of approved disposal facilities. Samples must be tested in accordance with regulatory and disposal facility permit requirements. Site specific requirements must meet 40 CFR Parts 264/265, Subpart A-E as stipulated within contractor documentation and must be reviewed and approved by the FAA RE and SECM prior to sampling.

Stored material with contaminant levels that exceed action levels must be treated or disposed offsite. Analyses for contaminated material to be taken to an offsite treatment facility must conform to local, state, and federal criteria as well as to the requirements of the treatment facility.

Documentation of all analyses performed must be furnished to the RE. Additional sampling and analyses to the extent required by the approved offsite treatment, storage, or disposal (TSD) facility must be approved by the RE.

3.7.2 SAMPLING LIQUID

Liquid collected from excavations and stockpile leachates must be sampled and tested in accordance with regulatory and permit requirements.

Liquid with contaminant levels that exceed action levels must be treated or disposed offsite.

Analyses for contaminated liquid must be taken to an offsite treatment facility and must conform to local, state, and federal criteria as well as to the requirements of the treatment facility.

Documentation of all analyses performed must be furnished to the RE. Additional sampling and analysis, to the extent required by the approved offsite TSD facility receiving the material, must be the responsibility of the Contractor and is subject to approval by the RE.

3.8 SPILLS

In the event of a spill or release of a hazardous substance (as designated in 40 CFR Part 302), pollutant, contaminant, or oil (as governed by the Oil Pollution Act (OPA), 33 U.S.C. 2701 et seq.), the Contractor must notify the RE immediately. If the spill exceeds the reporting threshold set by the State and/or EPA, the Contractor must follow the pre-established procedures as described in the Facility Contingency Plan for immediate reporting and containment. Immediate containment actions must be taken to minimize the effect of any spill or leak. Cleanup must be in accordance with applicable federal, state, and local regulations. As directed by the RE, additional sampling and testing must be performed to verify spills have been cleaned up

3.9 BACKFILLING

3.9.1 CONFIRMATION TEST RESULTS

Excavations must be backfilled immediately after all contaminated materials have been removed and confirmation test results have been approved. Backfill must be placed and compacted to the lines and grades shown on the drawings.

3.9.2 COMPACTION

Approved backfill must be placed in lifts with a maximum loose thickness of 12 inches. Soil must be compacted to 90 percent of maximum dry density.

3.10 CLOSURE REPORT

Three copies of a Closure Report must be prepared and submitted within 30 calendar days of completing work at the site. The report must be labeled with the contract number, project name, location, date, and the name of general contractor. The Closure Report must include the following information as a minimum:

a. A cover letter signed by a responsible company official certifying that all services involved have been performed in accordance with the terms and conditions of the contract documents and regulatory requirements.

b. A narrative report including, but not limited to, the following:

1. site conditions;

2. excavation logs;

3. field screening readings;

4. quantity of materials removed from each area of contamination;

5. quantity of water/product removed during dewatering;

6. waste disposal manifests

7. sampling locations and sampling methods;

8. sample collection data such as time of collection and method of preservation;

9. sample chain-of-custody forms; and

10. source of backfill.

c. Include the following:

1. Copies of all chemical and physical test results.

2. Copies of all manifests and land disposal restriction notifications, if applicable.

3. Copies of all certifications of final disposal signed by the responsible disposal facility official.

4. Field drawings showing limits of each excavation, limits of contamination, known underground utilities within 20 feet of excavation, sample locations, and sample identification numbers. On-site stockpile, storage, treatment, loading, and disposal areas must also be shown on the drawings.