02050 - DEMOLITION & REMOVAL.doc

SECTION 02050

DEMOLITION AND REMOVAL

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

AMERICAN PETROLEUM INSTITUTE (API)

API RP 2015

(1991) Cleaning Petroleum storage Tanks

API RP 1604 (1987) Removal and Disposal of

Used Underground Petroleum storage Tanks

API RP 1628

(1989) Guide to Assessment and Remediation of Underground Petroleum Releases

API RP 2003

(1991) Protection Against Ignitions Arising out of Static, Lightning and Stray Currents

API RP 2015

(1991) Cleaning Petroleum Storage Tanks

ENVIRONMENTAL PROTECTION AGENCY (EPA)

EPA SW-846

(Nov 1986; Rev O) Test Methods for Evaluating Solid Waste (Vol IA, IB, IC, and II)

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 327

(1993) Cleaning or Safeguarding Small Tanks and Containers Without Entry

NFPA 497M

(1991) Classification of Gasses, Vapors, and Dust for Electrical Equipment in Hazardous (Classified) Locations

1.2 GENERAL REQUIREMENTS

Do not begin demolition until authorization is received from the contracting officer. Remove rubbish and debris from the station daily; do not allow accumulations inside or outside the buildings or on airfield pavements. Store materials that cannot be removed daily in areas specified by the contracting officer.

Perform work to close, remove, and dispose of underground storage tanks, and connecting piping; including, but not limited to, dewatering (if approved), disposal of contaminated soil, laboratory testing, providing reports which are required by regulatory agencies, and backfilling.

1.3 SUBMITTALS

Submit the following in accordance with Section 01300, "Submittals and Contractor Furnished Items" for contracting office's approval.

1.3.1 Statements

a. Site safety and health plan

b. Excavation and material handling plan

c. Field sampling and laboratory testing plan

d. Tank and piping removal and disposal plan

e. Qualification

f. Spill and discharge control plan

g. Tank abandonment procedure

1.3.1.1 Site Safety and Health Plan

Describe safety and health plan and procedures as related to underground tank removal and pipe removal, and as related to operations associated with petroleum contaminated soils and water. Furnish the name and qualifications based on education, training, and work experience of the proposed Site Safety and Health Officer.

1.3.1.2 Excavation and Material Handling Plan

Describe methods, means, equipment, sequence of operations and schedule to be completed in excavation, transport, handling, and stockpiling of soil during underground tank removal. Thirty days before beginning tank removal work, submit to the contracting officer for approval a material handling plan that describes phases of dealing with the contaminated soil and water as it relates to the proposed tanks and piping removal, including methods of excavating, a material handling plan for the contaminated material, soil testing requirements, safety precautions and requirements, and water pumping and collection requirements.

1.3.1.3 Field Sampling and Laboratory Testing Plan

Each underground tank to be removed shall have the soil underneath the tank tested. Two samples shall be tested for each tank in accordance with GA EPD Gust-9 and GA regulations 391-3-15. Describe field sampling methods and quality control procedures. Identify laboratory and laboratory methods to be used for contamination testing. Sample reports shall show sample identification for location, date, time, sample method, contamination level, name of individual sampler, identification of laboratory, and quality control procedures. Send the soil samples to the laboratory for Total Petroleum Hydrocarbon (TPH) test, a BTEX test and a PAH test (EPA methods 8020 and 8270/8100 and 8015 shall be used.) . If the soil is contaminated, the contractor shall remove the soil in accordance with bidding schedule. If, when the tank is uncovered, it contains a coal tar coating, the coating shall be tested for asbestos and PCB's.

1.3.1.4 Tank and Piping Removal and Disposal Plan

Describe methods, means, sequence of operations, and schedule to be employed in the testing, pumping, cleaning, de-vaporizing, inspecting, removal, and disposal of underground storage tanks and piping.

1.3.1.5 Qualification (Contractor Experience)

If requested by the Government, prior to award, submit data showing that the tank removal contractor, subcontractors, and personnel employed on the project have been engaged in removal, transportation, and disposal of underground tanks and associated piping, are familiar with and shall abide with the following:

a. API RP 1604.

b. 40 CFR 280 and State and local regulations and procedures.

c. Applicable safety rules and regulations.

d. Use of equipment and procedures for testing and vapor-freeing tanks.

e. Handling and disposal of types of wastes encountered in underground tank and pipe removal including disposal of underground tanks and associated piping.

f. Excavation, testing, and disposal of petroleum contaminated soils, liquids, and sludge.

g. Provide documentation that tank removers are certified if locality of project has this requirement.

In addition, furnish data proving experience on at least three prior projects which included types of activities similar to those in this project. Provide project titles, dates of projects, owners of projects, point of contact for each project, and phone numbers of each point of contact. Provide all of these seven calendar days prior to start of work.

1.3.1.6 Spill and Discharge Control Plan

Describe procedures and plan related to potential spills and discharge of contaminated soils and water.

1.3.1.7 Tank Abandonment Procedure

Contractor shall submit to the contracting officer for approval the procedure for abandonment-in-place of underground storage tanks.

1.3.2

Reports

a. Identification of tanks removed and disposed of, including site map showing location of tank and piping.

b. Starting and ending dates of reporting period.

c. Closure report. Incorporate reports, records, and data into a single binder with the title "SITE ASSESSMENT REPORT" on the cover of the binder.

d. Laboratory testing reports, including location of soil excavated and associated OVA/FID (organic vapor analyzer/flame ionization device) readings, TPH (total petroleum hydrocarbons), PCB and asbestos tests for the coal tar coating around each removed tank, sampling and test results, Benzene, Ethylbenzene, Toluene, Xylene (BTEX) and Polynuclear Aromatic Hydrocarbons (PAH).

1.3.3 Records

a. Inspection permits and other permits required for underground tank removal.

b. Results of excavation including sketch showing location of underground storage tank, sampling locations, and extent of excavation.

c. Tank disposal paperwork, such as copy of UST Notification Form and method of conditioning tank for disposal.

d. Contaminated soil disposal paperwork, such as laboratory testing reports.

e. Contaminated water disposal paperwork, such as laboratory testing results.

f. Contractor shall prepare and complete a closure report or corrective action plan (CAP) as applicable in accordance with the GA EPD publication GUST-9. Contractor shall also submit the test results.

1.4

REGULATORY AND SAFETY REQUIREMENTS

Comply with federal, state, and local hauling and disposal regulations.

1.4.1 Notifications

Furnish timely notification of demolition and renovation projects to Federal, State, regional, and local authorities in accordance with 40 CFR 61-SUBPART M- and 40 CFR 280. Notify the contracting officer in writing 30 days prior to the

1.5

PROTECTION

1.5.1 Traffic Control Signs

Where pedestrian and driver or aircraft safety is endangered in the area of removal work, use traffic barricades with flashing lights. Anchor barricades in a manner to prevent displacement by jet or prop blast. Notify the contracting officer prior to beginning such work.

1.5.2 Existing Work

Protect existing work which is to remain in place, be reused, or remain the property of the Government. Repair items which are to remain or which are to be salvaged and which are damaged during performance of the work to their original condition, or replace with new. Do not overload structural elements or pavements to remain. Provide new supports and reinforcement for existing construction weakened by demolition or removal work. Repairs, reinforcement, or structural replacement shall have contracting officer approval.

1.5.3 Weather Protection

For portions of the building to remain, protect building interior and materials and equipment from the weather at all times. Where removal of existing roofing is necessary to accomplish work, have materials and workmen ready to provide adequate and temporary covering of exposed areas so as to ensure effectiveness and to prevent displacement.

1.5.4 Trees

Protect electrical and mechanical services and utilities. Where removal of existing utilities and pavement is specified or indicated, provide approved barricades, temporary covering of exposed areas, and temporary services or connections for electrical and mechanical utilities.

1.6 BURNING

Burning of anything shall not be permitted.

1.7 FOREIGN OBJECT DAMAGE (FOD)

Aircraft and aircraft engines are subject to FOD from debris and waste material lying on airfield pavements. Immediately remove all such materials that may appear on operational aircraft pavements due to the contractor's operations. If necessary, the contracting officer may require the contractor to install a temporary barricade at the contractor's expense to control the spread of FOD potential debris. The barricade shall consist of a fence covered with a fabric designed to stop the spread of debris. Anchor the fence and fabric to prevent displacement by winds or jet/prop blasts. Remove barricade when no longer required.

1.8 RELOCATIONS

Perform the removal and reinstallation of relocated items as indicated with workmen skilled in the trades involved. Repair items to be relocated which are damaged or replace damaged items with new undamaged items as approved by the contracting officer.

PART 2 PRODUCTS

Not used.

PART 3 EXECUTION

3.1 EXISTING UNDERGROUND STORAGE TANKS TO BE REMOVED

The work includes removal of existing underground No. 2 diesel fuel storage tanks at various locations at Robins Air Force Base. The work also includes backfilling and grading, and in some cases repaving excavated areas.

All work shall be accomplished in accordance with Federal, State, and local requirements, such as the Georgia Environmental Protection Divisions (GEPD) Regulations, as well as accepted safety standards. Before initiating work, the appropriate Government agencies shall be consulted concerning applicable regulatory and permit requirements. Payment of any fees and all applicable permits shall be obtained prior to beginning any work. Where required, contractors shall be approved by local authorities. Contractors, subcontractors, and their employees responsible for tank removal shall be familiar with: (a) all applicable safety rules and regulations regarding tank removal and installation procedures, (b) the use of equipment and procedures for testing tanks, (c) the handling and disposal of the types of wastes likely to be encountered, and (d) the applicable sections of the publications referenced herein.

3.2 EXISTING WORK

Where existing is changed or removed, or where new work adjoins, connects to or abuts existing work, the existing work shall be altered as necessary and connected in a substantial and workmanlike manner. All new work shall match, as nearly as practicable to the existing adjoining and/or adjacent similar work. Operations affecting existing work shall be conducted with care not to damage work in place; and all existing work damaged by such operations shall be rectified or replaced without additional expense to the

Government.

3.3 SALVABLE MATERIALS AND EQUIPMENT

Except where specified otherwise herein, all salvable materials and equipment disconnected or removed during the course of the work and not indicated or specified for reuse in the new work shall become the property of the contractor and shall be removed from the Government property.

3.4 DEBRIS AND UNUSABLE MATERIALS

All flammable scrap materials and debris shall be disposed of by removing completely from the Government property.

3.5

SCHEDULE AND SEQUENCE OF WORK

The work shall be executed in such a manner as to cause the least interference with the normal functions of the Government activity. Prior to beginning any work, the contractor shall meet with the contracting officer in order that an approved schedule and sequence of work may be arranged. The contractor shall notify the Environmental Management Directorate and the contracting officer 10 working days prior to the beginning of tank removal procedures.

3.6

INTERRUPTION OF SERVICES

Interruptions shall be kept to a minimum. No interruption shall occur unless scheduled and approved five working days in advance with the contracting officer. Each request shall include the time and duration of any interruption(s). Contractor shall provide temporary space heating for User occupied areas if heat is interrupted. Contractor shall provide temporary freeze protection for other areas interrupted if outside temperature is predicted to drop below 38 degrees F by local area weather forecaster.

3.7

UNDERGROUND FUEL STORAGE TANK REMOVAL

3.7.1 Tank Entry

The procedures outlined herein can be carried out without the need to enter the tank. Should tank entry be desired, the procedures outlined in API RP 2015, API RP 2015A, and API Pub 2217, and API RP 1631 shall be followed.

3.7.2 Special Precautions

During the course of underground storage tank removal, workers may be exposed to petroleum hydrocarbon liquids, vapors, or wastes. The precautions in 3.7.2.a and 3.7.2.b shall be observed by all individuals engaged in the procedures outlined herein.

a. Toxicity Considerations for Petroleum Substances: Workers shall be aware of appropriate health precautions. When high concentrations of petroleum hydrocarbon vapors are inhaled, symptoms of intoxication may result. These symptoms, ranging from simple dizziness to excitement or unconsciousness, are similar to those produced by alcohol or anesthetic gases. If such effects occur, the individual shall be immediately removed to fresh air. For minor effects of exposure, breathing fresh air or oxygen results in rapid recovery.

b. Flammability and Combustibility Consideration: Flammable or combustible vapors are likely to be present in the work area and may reach the flammable (explosive) range before venting is completed and a safe atmosphere is reached. Therefore, precautions shall be taken to: (1) eliminate all potential sources of ignition from the area (for example, smoking materials, nonexplosion-proof electrical and internal equipment), (2) prevent the discharge of static electricity during venting of flammable vapors, and (3) prevent the accumulation of vapors at ground level. Refer to API RP 2015 and \-API RP 2003 for general precautionary measures to follow during the vapor-freeing procedure.

c. A combustible gas indicator (CGI) shall be used to check for hazardous vapor concentrations. All open flame and spark-producing equipment within the vapor hazard area shall be shut down. Electrical equipment (for example, pumps and portable hand tools) used in the area shall be explosion-proof in accordance with NFPA 497M or otherwise approved for use in potentially explosive atmospheres.

3.7.3

Tank Removal Procedures

Contractor shall remove the underground storage tanks in accordance with the guidelines from The American Petroleum Institute (API) Bulletin No. 1604, Second Edition, December 1987, and GA EPD Guidelines GUST - 9 (Aug 95).

a. Fuel Removal:

1.

Drain product piping into the tank, being careful to avoid any spillage and remove product piping.

2.

Notify contracting officer 35 calendar days prior to tank removal procedures. Contractor to pump out any remaining fuel left in the tanks and dispose of fuel oil off base. Contractor shall assume that the tanks that serve the generator are 90% full. Other tanks are to be assumed at 50% full. Fuel to be drummed DOT approved containers. Consider remaining 10% of fuel contaminated or waste fuel; pump into 55 gallon drums or other suitable containers for disposal in accordance with approved procedures meeting local, state and federal regulations. Dispose of remaining fuel emulsions in accordance with applicable local, state, and federal regulations. Drums or tanks used for containerizing waste fuel will be furnished by the contractor.

b. Excavation: Uncontaminated topsoil shall be stripped and stockpiled separately for reuse at the location shown if it meets the requirements of clean fill given in Section 02220, "General Excavation, Filling, and Backfilling", paragraph 2.1.2.

c. Exploratory Excavations: Exploratory trenches shall be excavated as necessary to determine the tank location, limits and the location of ancillary equipment.

d. Tank Excavation: Excavation around the perimeter of the tank shall be performed in a manner that will limit the amount of potentially contaminated soil that could be mixed with previously uncontaminated soil. Contaminated soil shall be segregated in separate stockpiles. Surface water shall be diverted to prevent direct entry into the excavation. Dewatering of the excavation shall be limited to that necessary to assure adequate access to the tank and piping and to assure a safe excavation. Dewatering may result in the production of contaminated water and/or free product. If free product is encountered it shall be pumped and stored in 55 gallon drums and appropriately labeled.

e. Open Excavations: Open excavations and stockpile areas shall be secured while awaiting verification test results from the soil beneath the tank. The excavation shall not be backfilled without approval from the contracting officer. The contractor shall divert surface water around excavations to prevent water from directly entering into the excavation.

f. Stockpiles: Uncontaminated excavated soil shall be stockpiled and used for backfill in the tank excavation prior to using borrow material. Excavated material which is visibly stained and which has an obvious petroleum odor shall be considered contaminated and shall be stockpiled for sampling in accordance with the guidelines specified herein. Uncontaminated soil shall be stockpiled separately from the contaminated soil, a safe distance away from, but adjacent to, the excavation. Contaminated soil shall be placed on an impermeable geomembrane a minimum of 30 mils thick, and covered with a 10-mil sheet of geomembrane. The geomembrane shall be placed such that the stockpiled soil does not come into contact with surface water runoff. The 10-mil geomembrane cover shall prevent rain or surface water from coming into contact with the contaminated soil, as well as limit the escape of the volatile constituents in the stockpile.

General: After soil known to be contaminated has been removed or after soil excavation is complete, a minimum of two soil samples shall be taken from the area directly below the invert of the tank. Samples may be obtained from the pits using a backhoe with a Shelby tube attached to the bucket. Sample preservation and analytical procedures shall conform to EPA SW-846, 25 Feb 95, Methods 8020, 8270/8100 and 8015 (DRO).

2.

Stockpiled Material Sampling: Stockpiled contaminated soil shall be sampled and preserved in accordance with EPA SW-846, 25 Feb 95, Methods 8020, 8270/8100 and 8015 (DRO). Sampling locations, number and specific procedures shall be as required by the State of Georgia and the disposal facility. Three representative samples shall be collected.

3.

Analysis: Soil samples from the excavation and stockpiled material shall be tested in accordance with EPA SW-846, 25 Feb 95, Methods 8020, 8270/8100 and 8105 (DRO) for the following parameters: total recoverable petroleum hydrocarbons (TRPH) and BTEX (Benzene, Ethylbenzene, Toluene, Xylene) and PAH (Polynuclear Aromatic Hydrocarbons). Copies of all test results shall be provided to the contracting officer. The maximum allowable laboratory detection limits shall be 1.0 ppm for 500 ppm for TRPH. The testing laboratory and contractor shall adhere to the quality control program, including spikes, blanks, and duplicates, of EPA Methods 8020, 8270/8100 and 8015 (DRO).

g.

Removal:

Remove the fill pipe, gauge pipe and other tank fixtures. Remove the drop tube, except when it is planned to vapor-free the tank by using an eductor type air mover. Remove all non-product lines, such as vapor recovery lines, except the vent line. The vent line shall remain connected until the tank is purged. Temporarily plug all other tank openings so that all vapors will exit through the vent line during the vapor-freeing process.

Tank: The tank shall be removed from the excavation and the exterior cleaned to remove all soil and inspected for signs of corrosion, structural damage, or leakage. All materials coming into contact with the tank, or in the vicinity of the excavation such as shovels, slings and tools shall be of the nonsparking type. After removal from the excavation, the tank shall be placed on a level surface adjacent to the tank excavation and secured with wood blocks to prevent movement and potential leakage.

3. Contaminated Soil: After the tank has been removed from the ground, the adjacent and underlying soil shall be examined for any evidence of leakage. The soil shall be visually inspected for staining and also screened for the presence of volatile and semivolatile hydrocarbon contamination using a real time vapor monitoring instrument, such as a PID, photo ionization detector. Contaminated soil shall be transported off site for disposal. The contracting officer shall determine the extent of the contaminated soil to be removed from each site which is approximately 20 cy of contaminated soil for each site. Any evidence that contamination exceeds that indicated in the contract shall be reported to the contracting officer the same day it is discovered. After the known contaminated soil is removed, the excavation shall be sampled and analyzed as specified herein.

h. Purging of tank and/or piping:

1. Remove flammable vapors by one of the methods described herein, and as required by local codes. These methods provide a means for temporary vapor-freeing of the tank atmosphere. However, it is important to recognize that the tank may continue to be a source of flammable vapors even after following the vapor-freeing procedures. For this reason, caution shall be exercised when handling or working around tanks that have stored flammable or combustible liquids. Before initiating and during work in the tank area or on the tank, a combustible gas indicator shall be used to access vapor concentrations in the tank and work area.

2. Vent all vapors from the tank at a minimum height of 12 feet above grade and three feet above any adjacent roof lines until the tank is purged of flammable vapors. The work area shall be free from sources of ignition.

3. Flammable and combustible vapors may be purged with an inert gas such as carbon dioxide (CO2) or nitrogen (N2). This method shall not be utilized if the tank is to be entered for any reason, as the tank atmosphere will be oxygen deficient. The inert gas shall be introduced through a single tank opening at a point near the bottom of the tank at the end of the tank opposite the vent. When inert gases are used, they shall be introduced under low pressure to avoid the generation of static electricity. When using CO2 or N2, pressures in the tank shall not exceed 5 pounds per square inch.

-- CAUTION --

The process of introducing compressed gases into tank may create potential ignition hazard as the result of the development of static electrical charges. The discharging device must therefore be grounded. Explosions have resulted from the discharging of CO2 fire extinguishers into tanks containing a flammable vapor-air mixture. CO2 extinguishers shall not be used for purging flammable atmospheres.

4. If the method described in 3.7.3.i is not practical, the vapors in the tank may be displaced by adding solid carbon dioxide (dry ice) to the tank in the amount of at least 1.5 pounds per 100 gallons of tank capacity. The dry ice shall be crushed and distributed evenly over the greatest possible area in the tank to promote rapid evaporation. As the dry ice vaporizes, flammable vapors will flow out of the tank and may surround the area. Therefore, where practical, plug all tank openings except the vent after introducing the solid CO2 and continue to observe all normal safety precautions regarding flammable or combustible vapors. Make sure all dry ice has evaporated before proceeding.

-- CAUTION --

Skin contact with dry ice may produce burns.

5. Flammable vapors may be exhausted from the tank by one of two methods of tank ventilation listed below:

(a) Ventilation using an eductor-type air mover driven by compressed air: The eductor-type air mover must be properly grounded and bonded to prevent the generation and discharge of static electricity. When using this method, the fill (drop) tube shall remain in place to ensure ventilation at the bottom of the tank. Tanks equipped with fill (drop) tubes that are not removable shall be purged by this method. An eductor extension shall be used to discharge vapors a minimum of 12 feet above grade.

(b) Ventilation with a diffused air blower: When using this purging method, it is imperative that the air-diffusing pipe is properly bonded to prevent the discharge of a spark. Fill (drop) tubes shall be removed to allow proper diffusion of the air in the tank. Air supply shall be from a compressor that has been checked to ensure a clean air supply and is free from volatile vapors. Air pressure in the tank must not exceed five pounds per square inch gauge.

6.

Steam can be used to clean and vapor-free a tank. However, a large static charge can build up on the nozzle of the steam jet. Insulated objects on which the steam impinges can also become charged. If steam is to be used for either purging or cleaning the tank of other equipment, the steam discharge nozzle and all conductive insulated objects subject to impingement of condensation shall be bonded to the tank or be grounded. Steam purging of tanks shall be avoided when suitable alternatives are available. Further reference to steam cleaning of tanks is found in NFPA 327.

i. Testing:

The tank atmosphere and the excavation area shall be regularly tested for flammable or combustible vapor concentration until the tank is removed from both the excavation and the site. Such tests are to be made with a combustible gas indicator which is properly calibrated according to the manufacturer's instructions (typically on pentane or hexane in air), and which is thoroughly checked and maintained in accordance with the manufacturer's instructions. Persons responsible for testing shall be completely familiar with the use of the instrument and the interruption of the instrument's readings.

2. The tank vapor space is to be tested by placing the combustible gas indicator probe into the fill opening with the drop tube removed. Readings shall be taken at the bottom, middle, and upper portions of the tank, and the instrument shall be cleared after each reading. If the tank is equipped with a non-removable fill tube, readings shall be taken through another opening. Liquid product shall not enter the probe. Readings of 20 percent or less of the lower flammable limit shall be obtained before the tank is considered safe for removal from the ground.

j. After the tank has been freed of vapors and before it is removed from the excavation, plug or cap all accessible holes. One plug shall have a 1/8-inch vent hole to prevent the tank from being subjected to excessive differential pressure caused by temperature changes. The tank shall always be positioned with this vent plug on top of the tank during subsequent transport and storage.

k. Excavate around the tank to uncover it for removal. Remove the tank from the excavation and place it on a level surface. Use wood blocks to prevent movement of the tank after removal and prior to loading on a truck for transportation. Use screwed (boiler) plugs to plug any corrosion holes in the tank shell.

l. When removing the tank, contaminated backfill may be encountered. The contamination can be due to minor spills and drips during previous operation of the facility or from drips and minor spills that occur during removal. Contaminated backfill may be a potential safety and environmental hazard. Spills or drips shall be contained to minimize contamination during removal. If contamination is encountered, consult local environmental officials, for assistance and requirements. See API RP 1628 for further information.

m. Tanks shall be labeled after removal from the ground but prior to removal from the site. Regardless of the condition of the tank, the label shall contain a warning against certain types of reuse. The former contents and present vapor state of each tank, including vapor-freeing treatment and following with legible letters at least 2 inches high.

TANK HAS CONTAINED DIESEL

NOT VAPOR FREE

NOT SUITABLE FOR STORAGE OF FOOD OR

LIQUIDS INTENDED FOR HUMAN OR ANIMAL CONSUMPTION

n. Tank shall be removed from the site as promptly as possible after vapor-freeing procedures have been completed, preferably on the day of tank removal from the excavation. If a tank remains at the site overnight or longer, additional vapor may be released from any liquid absorbed in the tank walls or residues remaining in the tank.

o. Before the tank is removed from the site, the tank atmosphere shall be checked with a combustible gas indicator to ensure that it does not exceed 20 percent of the lower flammable limit.

p. The tank shall be secured on a truck for transportation to the disposal site with the 1/8-inch vent hole located at the uppermost point on the tank. Tanks shall be transported in accordance with all applicable local, state and federal regulations.

q. Disposal:

After the tank has been vapor-freed, it shall be rendered unsuitable for future use as a storage tank by puncturing, cutting, or drilling numerous holes in all sections of the tank.

A bill of sale shall be used to transfer tank ownership.

3.

Prior to disposal of the tank, current federal, state, and local regulations shall be checked to determine if special procedures or preparations are required.

4.

Contractor shall provide copies of records for the contracting officer which demonstrate proper disposal of the tanks.

r. Backfill to fill up void created by underground tank removal shall be provided by contractor from outside sources and shall meet the requirements of Section 02220 “General Excavation, Filling, and Backfilling”, paragraph 2.1.2.

3.8

EXISTING FACILITIES TO BE REMOVED

3.8.1 Structures

3.8.2 Utilities and Related Equipment

Remove existing utilities, as indicated and terminate in a manner conforming to the nationally recognized code covering the specific utility and approved by the contracting officer. If utility lines are encountered that are not shown on drawings, contact the contracting officer for further instructions.

3.8.3 Paving and Slabs

Remove sawcut concrete and asphaltic concrete slabs including aggregate base as indicated. Provide neat sawcuts at limits of slabs removal as indicated.

3.8.4 Roofing

Remove shingle roofing to effect the connections with new flashing or roofing. Cut existing felts along straight lines. Remove roofing without damaging the roof deck.

3.8.5 Masonry

Sawcut and remove masonry so as to prevent damage to surfaces to remain and to facilitate the installation of new work. Where new masonry adjoins existing, the new work shall abut or tie into the existing construction as indicated.

3.8.6 Concrete

Saw concrete along straight lines to a depth of not less than 2 inches. Make each cut in walls perpendicular to the face and in alignment with the cut in the opposite face. Break out the remainder of the concrete provided that the broken area is concealed in the finished work, and the remaining concrete is sound. At locations where the broken face cannot be concealed, grind smooth or saw cut entirely through the concrete.

3.8.7 Patching

Where removals leave holes and damaged surfaces exposed in the finished work, patch and repair these holes and damaged surfaces to match adjacent finished surfaces. Where new work is to be applied to existing surfaces, perform removals and patching in a manner to produce surfaces suitable for receiving new work. Finished surfaces of patched area shall be flush with the adjacent existing surface and shall match the existing adjacent surface as closely as possible as to texture and finish. Patching shall be as specified and indicated, and shall include:

a.

Holes and depressions left as a result of removals in existing masonry walls to remain shall be completely filled with an approved masonry patching material, applied in accordance with the manufacturer’s printed instructions.

b.

Where existing partitions have been removed leaving damaged or missing resilient tile flooring, patch to match the existing floor tile.

3.9

FILLING

Fill holes, open basements, and other hazardous openings in accordance with

Section 02220, “General Excavation, Filling & Backfilling.”

3.10

DISPOSITION OF MATERIAL

3.10.1 Title to Materials

Except where specified in other sections, all materials and equipment removed, and not reused, shall become the property of the contractor and shall be removed from Government property. Title to materials resulting from demolition, and materials and equipment to be removed, is vested in the contractor upon approval by the contracting officer of the contractor's demolition and removal procedures, and authorization by the contracting officer to begin demolition. The Government will not be responsible for the condition or loss of, or damage to, such property after notice to proceed. Materials and equipment shall not be viewed by prospective purchasers or sold on the site.

3.10.2 Reuse of Materials and Equipment

Remove and store materials and equipment indicated on the drawings to be reused or relocated to prevent damage, and reinstall as the work progresses.

3.10.3 Salvaged Materials and Equipment

Remove materials and equipment that are indicated on the drawings to be removed by the contractor and that are to remain the property of the Government, and deliver to a storage site, as directed by the contracting officer.

3.11

CLEANUP

3.11.1 Debris and Rubbish

Remove and transport debris and rubbish in a manner that will prevent spillage on pavements, streets or adjacent areas. Immediately clean up any spillage from pavements, streets and adjacent areas. Conform to other applicable requirements under Section 01560, "Environmental Protection".

3.12

TANK ABANDONMENT

1. Remove all liquid which can be pumped out of the tank and pipiping system. A hand pump or suction pump may be required to remove the bottom four inches of liquid from the tank.

2. Any remaining product may be removed by floating it with a small amount of water. Note that this contaminated water-product mix constitutes a hazardous waste that must be disposed of according to applicable regulations.

Flammable vapors shall be expelled through the tank vent and remaining fill openings during the water filling operation. Purged product may also flow out of the tank openings if the tank is overfilled. Therefore, the entire operation shall be considered hazardous, and precautions shall be taken to prevent vapor ignition.

3. Excavate down to the tank top at all fill and gauge openings and at connected lines.

4. Remove, or disconnect and plug all but one of the tank's fill, gauge, and product delivery lines. The remaining accessway will be used to pump inert material fill into the tank.

5. Disconnect, empty, and cap all piping. Care shall be taken to avoid spilling product from the piping into the excavation.

6. Fill the tank with a solid, inert material such as sand, a concrete slurry, or grout. This fill material may be introduced into the tank through the manway (if one exists), the opening that was used to add and remove water (if large enough), or a hole punched in the tank top using a backhoe or other equipment. This operation shall be considered hazardous, and precautions shall be taken to prevent vapor ignition.

7. Disconnect and cap all vent lines.

8. Cover the tank with backfill material and grade.

9. Any type of sand is suitable for fill as long as it is free of rocks which might prevent leveling out in the tank. The sand may be introduced into the tank in dry form as long as it flows in freely and, when the cone nears the top of the tank, can be washed into the tank with a nominal amount of water and puddled to cause it to flow to the ends of the tank. The use of extensive amounts of water shall be avoided in this instance as the tank might be filled with water before it is filled with sand.

Concrete or grout slurries can also be used for fill. Depending upon site economics, such as the availability and proximity of materials and labor requirements, these options may be somewhat more expensive than using sand fill. However, they will eliminate the need for puddling to ensure that the tank is completely full, and as such may be attractive alternatives in some instances. If one of these options is used, the tank drop tube must be removed before the tank can be pumped full of the slurry.

Detailed records shall be maintained during abandonment procedures. These records shall include, at a minimum, the following information:

a. The date of the closure operation.

b. The as-abandoned location of the tank and piping which remain in the ground.

c. The amount of product removed and the method of disposal (or use) of that product.

d. The amount of water used (for product removal) and the method of (treatment and) disposal of that water.

e. The location of tanks abandoned in place shall also be noted on the property records.

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