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TOROMOCHO PROJECT

EQUIPMENT PRESERVATION PLAN

Report No. 000-PR-R-002

Aker Solutions Owner Approval:

333 East Wetmore Road, Suite 600Tucson, Arizona 85705 Date:

REV DATE BY CHK APPROVAL DESCRIPTION

A 16 Feb 11 TMk MS/RD Issued for Client Approval

DISTRIBUTION A B C 0 1 2 3 4 5 6ClientProcurementFieldInternal

Prepared for Minera Chinalco Peru S. A.

R0534200 / C560

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Contents

1. INTRODUCTION...................................................................................................................4

1.1 General..........................................................................................................................41.2 HSE................................................................................................................................4

2. DEFINITIONS........................................................................................................................4

3. PRESERVATION ACTIVITIES AND RESPONSIBILITIES...................................................5

3.1 General..........................................................................................................................53.2 Responsibilities and Scope of Work..............................................................................6

4. STORAGE AND HANDLING.................................................................................................7

4.1 Delivery Check...............................................................................................................74.2 Handling and Off-Loading..............................................................................................84.3 Storage..........................................................................................................................84.4 Bulk Storage Items.........................................................................................................84.5 General Protection.........................................................................................................94.6 Spare Parts....................................................................................................................94.7 Load Out Precautions....................................................................................................94.8 Shipped Loose Items.....................................................................................................9

5. PRESERVATION REQUIREMENTS.....................................................................................9

5.1 Initial Preservation.........................................................................................................95.2 Minimum Requirements...............................................................................................105.3 Maintenance Preservation...........................................................................................135.4 Preservation Labels.....................................................................................................135.5 Preservation / Protection Procedure............................................................................145.6 Documentation.............................................................................................................145.7 Requirement for Revisions...........................................................................................145.8 Material Safety Data Sheets........................................................................................14

6. ELECTRICAL PRESERVATION INSTRUCTIONS AND CHECKLISTS.............................14

6.1 General........................................................................................................................146.2 Checklists.....................................................................................................................15

7. INSTRUMENT PRESERVATION INSTRUCTIONS AND CHECKLISTS............................16


8. MECHANICAL PRESERVATION INSTRUCTIONS AND CHECKLISTS............................17


9. EXHIBITS............................................................................................................................18

1. INTRODUCTION

1.1 General

The objective is to ensure that equipment and materials are kept in a good condition throughout all phases of the project. To achieve this objective, detailed preservation check lists are provided. These lists form the basis of the preservation maintenance program, and they will also be further developed to incorporate specific suppliers' requirements.

To assist the development of the preservation maintenance program, a computerized preservation register shall be used as a tool to fulfill the following:

(i) To ensure all the contractors have a consistent approach to preservation planning and reporting

(ii) To enable a continuous preservation program to be established throughout all phases of the project

(iii) To provide an up-to-date status of the equipment preservation and highlight the outstanding items.

1.2 HSE

In dealing with preservation agents the necessary precautions shall be taken to avoid any damage to health and environment.

MSDS Information is required at site prior to shipping of materials

2. DEFINITIONS

Initial preservation

The application of specified preservatives and fitting of specified protection to anyequipment/system by suppliers prior to delivery, to maintain the system unimpaired by the responsible Supplier.

The initial preservation shall remain in effect until the preservation maintenance is started or the equipment or materials are depreserved to allow pre- commissioning and commissioning to commence.

Depreservation

These are activities that shall be performed, if required, on equipment to allow precommissioning and commissioning of systems (or part systems).

Preservation Maintenance

These are the preservation activities carried out in Lima, then on site locations to maintain the equipment and material in an as new condition. This also includes repair of deteriorated initial preservation.

Preservation Checklist

An itemized list defining the preservation requirements for the various types of equipment and materials with preservation intervals identified against each specific check.

Preservation Periods

These define the maintenance intervals per type of equipment, as identified in the preservation checklists.

Preservation Register

A computer register where the suppliers' and the project's preservation plans shall be entered and reported against.

Equipment Preservation

This means preservation of any type of tagged items delivered to the project, i.e. individually tagged items or tagged equipment items of a package.

Bulk Material Preservation

Hereafter called Material Preservation, means preservation of any type of untagged items delivered to the project, i.e. bulk deliveries, prefabricated items, spools, lines, valves, total systems, etc.

3. PRESERVATION ACTIVITIES AND RESPONSIBILITIES

3.1 General

This section provides the activities and organization necessary to carry out the initial preservation and to develop the preservation maintenance program. It defines the project phases and the responsibility of all the parties concerned.

Initial Preservation

This is performed by the supplier of equipment and materials prior to shipment or by the contractor by installation, to maintain equipment unimpaired.

Lima & Construction Site Preservation

The specified team performs this at the respective locations.

Initial preservation is also performed by the contractor under Aker Solutions (AS) supervision where items arrive not preserved or the

preservation is permanently removed to allow construction or installation activities to proceed.

Initial preservation of self produced items including preservation of systems and areas.

De-preservation of equipment will normally be required to allow pre-commissioning and commissioning activities to be performed at site.

3.2 Responsibilities and Scope of Work

The following defines the responsibilities and the scope of work.

Equipment Suppliers

The equipment suppliers shall be responsible for carrying out the initial preservation of equipment, including packing and shipping preservation.

Further, suppliers shall be responsible for producing specific preservation instructions to cover their equipment during the project phases for a period of two years.

The delivery documentation shall contain a procedure for storage of the skid / equipment and for maintenance preservation during the construction period at the construction site. This procedure shall also include method for removal of the preservation used on the skid / equipment, Documentation shall also contain any MSDS for all preservation products being used

Supplier should fill out preservation labels and fix it to the equipment.

Lima Material Management

The Lima Material Control Manager is the single point of contact against the vendor. All communication shall take place through him.

The Preservation Engineer has the technical responsibility and shall in cooperation with the Procurement department ensure that:

- preservation requirements are defined in the IOM’s

- in cooperation with the Procurement department accept procedures from vendor

- accept preservation agents

Lima Material Management Responsibilities

Shall be responsible for checking that the equipment arrives with the initial preservation complete and intact according to supplier's instructions. Any doubt as to the equipment preservation status shall be registered and reported to the Procurement department, which will take further action.

Lima Material Management Scope of Work

Shall be responsible for the management, implementation, execution, status reporting and documentation of all preservation activities including:

- Inspection of equipment on receipt.

- Application of initial preservation where not applied or where the preservation is removed to allow construction and installation, e.g. hermetically sealed units.

- Re-application where preservation has been damaged during transportation (supplier assistance to be used where required).

- Care and cleanliness of equipment during off-loading, storage and handling.

- Preservation of equipment after installation.

- Initial preservation of bulk materials including piping, valves and complete piping systems according to the contractor's specifications.

- Preservation maintenance in accordance with the specifications, check lists and the supplier's requirements. Supplier's requirements shall govern in the event of discrepancy.

- Updating of the computerized preservation register to provide a weekly status report, and to provide a cut-off status report for the inshore hook-up contractor.

- Carry out de-preservation prior to commissioning and, if required, prior to pre-commissioning of systems.

4. STORAGE AND HANDLING

4.1 Delivery Check

The equipment, on delivery to site, shall be checked to ensure that the supplier's initial preservation is intact. For those packages which are hermetically sealed with a humidity detector, only a visual inspection and reading of the humidity indicator is required.

The supplier's instructions noted on the packing crates and in the shipping papers shall be regarded as mandatory during handling and storage.

Any doubt as to the equipment preservation status shall be clarified with the supplier and if necessary arrange for the Supplier to visit site to verify the status and advise further actions.

4.2 Handling and Off-Loading

The off-loading and handling of the equipment shall be done in a safe and careful manner. Special attention shall be given to fragile equipment and adequate precautions taken to prevent damage during the lifting and transportation.

4.3 Storage

The type of storage required will depend upon the type of equipment and the preservation requirements.

Wherever possible and subject to climatic conditions, equipment shall be stored under cover in a permanent storeroom or in a temporary building to provide weather protection. Outdoor storage is only acceptable for equipment prepared for it by the supplier. The storage environment has to meet with suppliers’ requirements.

Sensitive equipment shall be stored in designated store rooms, which are to be dry, heated, vented, clean and dust free.

Space heaters on equipment not stored in heated rooms shall be energized. If required, temporary heaters shall be used.

All storerooms shall have authorized entry only to allow proper material control.

All warehouses and store rooms which are normally unmanned shall be inspected on a regular basis to ensure that the equipment is stored securely, the localities are dry and, where applicable, the heating and ventilation systems are working.

4.4 Bulk Storage Items

The free issue of materials shall be delivered directly from the suppliers. The Procurement Manager should, wherever possible, arrange for the bulk materials to be stored at the Supplier's facilities until required for use. This will minimize the exposure of the items to the construction environment.

4.5 General Protection

Adequate precautions shall be taken to protect the equipment/items against possible damage in connection with installation and construction works in the vicinity of the item.

4.6 Spare Parts

Project spares shall, if agreed in contract be stored and preserved at the Supplier's facilities and only requested when required for use.

4.7 Load-Out Precautions

Suitable protection and precautions shall be taken to prevent damage of equipment and items during transportation and platform load out. All preservation shall be done prior to sea fastening. Preservation labels will show the status of the preservation.

4.8 Shipped Loose Items

Shipped loose items shall be mechanical protected, carefully packed and crated in wooden boxes, which shall be securely fastened to prevent damage during shipment.

5. PRESERVATION REQUIREMENTS

5.1 Initial Preservation

Supplier shall perform initial preservation. The supplier shall state any protective and preventative measures to be observed by the organization responsible for preservation if no such information is received or if such information proves to be insufficient.

The preservation team may be instructed by the AS Site team to implement the AS minimum requirements for initial preservation or any part thereof as described hereafter in Section 6.2.

All equipment supplied to AS shall be preserved and protected against harmful environmental effects for the period as specified in the purchase agreement.

The preservation shall remain in effect until after the equipment has been unpacked and installed. The equipment may be subject to pre-commissioning and commissioning activities within the two-year period. Any preservation and protection or de-preservation activities required, as a consequence of this, shall be specified.

Preservation and protection shall guard against all external action normally encountered during shipment, handling, storage, installation and in the idle period to start up for the intended use. Supplier shall state any protective and preventive measures to be observed by AS.

5.2 Minimum Requirements

The following minimum requirements shall form the standards for the preservation engineer to restore supplier's equipment to an acceptable level of initial preservation. These minimum requirements shall be implemented when instructed by AS based on preservation team’s doubt on the equipment's preservation status.

5.2.1 Environmental Conditions

The environmental conditions to be protected against shall include variation in temperature, wind, humidity, rain and seawater, dust precipitation and forces normally encountered during shipment, handling and transportation at sea. Consideration shall be given to the possibility that temperatures encountered during transport may reach extremes other than those prevailing at supplier's works, fabrication sites or at the offshore location.

5.2.2 External Protection

External protection shall prevent damages from dropped construction objects, sandblasting, grinding, welding, flame cutting, step on by personnel, water jetting, painting etc.

All in/outlets from units/skids shall be plugged/blanked. All flanged openings shall be provided with self adhesive flange face protectors and if applicable, 10 mm plywood / metal closure sufficient to provide mechanical protection and water/dust tight sealing.

Closure to be fixed with at least four full diameter bolts. For studded openings, all nuts needed for the intended service shall be used for securing closures.

Threaded openings shall have metal plugs of metallurgy equal to the component being capped or plugged. If IP rating is maintained, plastic plugs are acceptable for non-hydraulic/pneumatic systems.

On insulated pipes the jacketing shall be protected to avoid damage. Painted surfaces on equipment shall be protected from wear and tear caused by environmental conditions or by fabrication activities.

Equipment should not be sealed in a way that will obstruct inspection. Access for normal inspection and preservation maintenance shall be provided. Preservation maintenance instructions shall state how the protection shall be renewed in cases where sealed off items may need to be opened.

Openings shall be sealed and protected against ingress of moisture and accidental removal using self adhesive flange face protectors and if applicable, metal or wooden blanks on flanges and plastic or caps on pipes.

A layer of heavy corrosion inhibitor or moisture repellent coating shall protect machined surfaces, other than flange faces. Threads on valve stems shall be protected with Teflon lubricant and vulcanized non-adhesive tape or similar. Consideration shall also be given to physical protection in the form of plastic wrapping or local wooden crating.

All threaded connections, male and female, shall be coated with a suitable soluble corrosion inhibitor and given physical protection in the form of caps, sheeting and vulcanized non-adhesive tape to prevent damage during transit and storage.

Mechanisms shall be constrained from harmful movement. Requirements for removal of such constraints shall be posted in a conspicuous manner and clearly marked as temporary supporting with reference to removing instructions. Expansion joints on heat exchangers shall be fitted with a hard protective sleeve prior to shipment to prevent mechanical damage during transit, installation and initial operations. The sleeve shall not impair the function of the expansion joint. Delicate mechanisms shall be protected against impact by local shock absorbing packing or bracing.

5.2.3 Internal Protection

Internal surfaces of heat exchangers, tanks, pressure vessels, piping systems and similar equipment shall be cleaned of surface corrosion and foreign material and thoroughly dried after completion of all tests and inspections. Carbon steel internal surfaces, unless protected by epoxy type coating or rubber lined, shall be sprayed, brushed or flushed with a suitable soluble corrosion inhibitor/VCI. The inhibitor shall be approved by AS. For equipment where water is used for cleaning or pressure testing, the water shall have antifreeze medium added unless the water is completely drained off. If ambient temperature is below 4 deg C during any of these operations, the water shall have antifreeze medium added. For preservation during and after testing vapor corrosion inhibitor shall be used. . External surface on stainless steel pipe work has to be protected with non-flammable cloth from start of prefabrication until take-over by AS.

In addition, bags of desiccant (e.g. silica gel) shall be placed inside nozzles of adequate size to facilitate removal. The nozzle or cover shall be marked: ”Remove xx number of desiccant bags prior to any pre commissioning activities”. The amount of desiccant and its distribution shall be according to the volume and partitioning of the enclosure.

Internal surfaces wholly consisting of corrosion resistant materials shall not be preserved unless the supplier recommends special preservation methods.

Openings shall be sealed and protected against ingress of moisture and accidental removal using metal or wooden blanks on flanges and plastic tape or caps on pipes.

Neoprene gaskets and plastic tape shall be used on flange openings to ensure watertight sealing. Flange surfaces of not corrosion resistant materials shall be sprayed or brushed with a suitable soluble corrosion inhibitor before sealing.

After installation of equipment is completed and the process or utility pipe work is connected, pipe work flanges on the equipment shall be sealed with galvanized dust blinds which should be clearly marked with tabs painted in red color.

5.2.4 Instrument and Electrical Components

Instruments, precision items, electrical cabinets, motors, switchboards, panels etc. shall be protected internally and externally according to Supplier's standards. Special attention shall be given to the need for a moisture-free atmosphere, which may require tight wrapping and the use of desiccant to absorb any moisture trapped inside the package. Equipment should not be sealed off such as to render impossible incoming inspection at the point of destination. Access for normal inspection and prescribed maintenance shall be provided. Preservation maintenance instructions shall state how the protection shall be renewed in cases where sealed off items may need to be opened. As a minimum the AS requirements for internal and external preservation are as follows:

a) Vapor corrosion inhibitor (type Cortec or similar) shall be placed inside all junction boxes, instruments with electrical connections and pneumatic connection such as positioner boxes, controllers, indicators not filled with glycerin.

b) Cover all glass instruments such as controllers, gauges, meters, panel fronts, etc, with 6 mm water resistant plywood or plastic caps.

c) Protect metal bodies or housings with long term preservation wax.

d) Preserve spindle and stuffing box on valves and actuators with Teflon lubrication and vulcanized non-adhesive tape.

e) Preserve actuator cylinder and accumulator bottles with clean hydraulic oil with VCI additive. Pneumatic actuator cylinders to be filled with sufficient lubricant to create a film of oil inside the cylinder when cylinder is stroked.

f) When a component requires an individual protection, a cladding of fiberglass with aluminum lining shall be used (not PVC-plastic). In control rooms where sensitive instruments and electrical equipment are installed, the Contractor shall maintain a dry atmosphere with maximum relative humidity of 40%.

5.3 Maintenance Preservation

The minimum requirements are detailed in the check lists in Sections 7, 8 and 9. Additional requirements specific to particular equipment shall be identified and detailed by the supplier concerned.

The preservation maintenance check lists have been divided into the following disciplines; Electrical, Instrument and Mechanical.

The instrument check list also covers fire and gas equipment, telecommunication equipment, and process control related equipment.

The mechanical check list also covers HVAC, piping, safety equipment and architectural items.

There are five possible time intervals on the checklists, (2, 4, 8, 12, and 24 weeks) and the specific checks are identified against the required interval. The higher intervals when called for shall include the checks covered by the lower periods.

When equipment, which is suitably preserved for long term storage and does not require regular maintenance checks, is placed in warehouses prior to installation, a general storage reference number shall/can be assigned and registered.

Additional instructions to be taken if the material and/or equipment is stored for some period of time – longer then the normal. Refer to the IOM’s for special instruction for long term preservation.

When this equipment is removed from the store, the applicable check list number shall replace the general storage reference number and the preservation dates will be scheduled in the register accordingly.

Where a product type is shown in the preservative column of a check list, the preservation engineer shall arrange for sufficient quantities of the product or equivalent for the maintenance program. Similar products or revised product names shall be used when required. Where doubt about the specification of a similar product exists, Contractor shall obtain acceptance from the AS site team.

5.4 Preservation Labels

Preservation labeling shall be the preservation engineer’s responsibility. Contractor may organize his own labeling system to verify that the labeled equipment, materials, systems or areas are being maintained by preservation.

Where labels are secured, they shall be stick on type or tie on type in writeable plastic label. The stick on type shall leave no trace of bond or plastic when removed. Carbon steel wire shall not be used for the tie on type (Exhibit Pr-R-002A).

5.5 Preservation / Protection Procedure

As part of the requirements for Contractor demonstrating co-ordination of his preservation/protection procedure, the preservation team shall organize and maintain a document system in which each discipline within Contractor's organization requests, where required, permission for preservation to be interrupted or removed.

All such requests shall be made to the preservation engineer who shall be responsible for ensuring that the interruption or removal of preservation is coordinated and documented.

The request form shall be provided by the preservation engineer and signed by the discipline supervisor or foreman whose activity affects the preservation.

The preservation register shall be updated to reflect all such interruptions and removals.

5.6 Documentation

The computerized preservation register (and preservation labels) provides the system which documents and verifies that preservation activities have been carried out. However, the preservation engineer shall maintain adequate records of all preservation activities and checks performed which shall be available for inspection.

5.7 Requirement for Revisions

Where the preservation procedure proves to be inadequate based on actual site conditions, the preservation engineer may modify them. Such instructions shall be in writing.

5.8 Material Safety Data Sheets

A file with material safety data sheets for all preservation products being used shall be established and be available on all sites handling preservation chemicals.

6. ELECTRICAL PRESERVATION INSTRUCTIONS AND CHECKLISTS

6.1 General

The following requirements should be read in conjunction with the check lists contained in this section. Authorized electrical personnel shall carry out all preservation of electrical equipment.

Junction boxes shall have the correct type of Vapour Corrosion Inhibitor (VCI) inside. The threads of all cover fixing bolts shall be coated with non-acid Vaseline. The cover joint shall be sealed with vulcanized non-adhesive tape and all entry holes shall be sealed with plastic blanking, or where connections are completed, the shrouds shall be fitted.

During storage in any non-heated area space heaters should be energized inline with the vendor’s recommendations. The heaters shall not be left non-energized for more than 14 days in dry air or 48 hours in area of high humidity.

Once equipment is in position space heaters (if fitted) shall be energized.

For equipment that may be exposed to damage, a non-flammable protection cover should protect it.

All non-terminated cable ends shall be fitted with shrinking shroud.

All Control -, transformer - and battery rooms shall have portable electrical air drying units installed with sufficient capacity to maintain air at a maximum relative humidity of 40%.

Generators and motors installed inside ventilated hoods are subject to the same requirements as for electrical rooms above.

Heating is not required in rooms with electrical air drying facilities.

Batteries shall be stored in dry rooms at temperatures between 00C and +100C and be protected against fouling and corrosion by applying a thin layer of Vaseline to the untarnished metal parts (poles).

Use preservation wax, where appropriate, e.g. exposed bare carbon steel shall be waxed where painting is not applied.

Where megger testing is specified, minimum acceptance insulation values are provided in discipline specifications, and or vendor supplied manuals.

Flanges on all equipment to be checked for grease application. Grease type to be Poly Butyl Cuprysil (PBC) or similar.

6.2 Checklists

PreservationChecklist no. Description

EP-01 Electrical motors, generators, transformers

EP-02 Electrical equipment

EP-03 Insulation resistance

7. INSTRUMENT PRESERVATION INSTRUCTIONS AND CHECKLISTS

7.1 General

The following general notes should be read in conjunction with the checklists contained in this section. Authorized instrument technicians shall carry out all preservation of instrumentation equipment.

Ensure that all instruments are wrapped and properly sealed. A protection cover in non-flammable material should protect instruments, which may be exposed to damage.

All openings in hydraulic/pneumatic tubing shall be provided with steel caps or solid shank steel plugs of metallurgy equal to the metallurgy of the component being capped or plugged

Gaskets/O-rings on instrument equipment shall be greased with acid free Vaseline.

All non-terminated cable ends shall to be fitted with shrinking shroud.

All spare cable entrances in panels and boxes shall be plugged.

Any damage to the instrumentation systems should be reported to the commissioning supervisor immediately.

Ensure that junction boxes have a correct type of vapor corrosion inhibitor (VCI) inside... Ensure that threads of all cover fixing bolts are coated with acid free Vaseline and cover joints are sealed with vulcanized non-adhesive tape. All entry holes should be sealed with plastic blankings.

Use preservation wax, where appropriate. E.g. exposed bare carbon steel shall be waxed when painting is not applied.

7.2 Checklists

PreservationChecklist no. Description

JP-01 Instrument equipment

JP-02 Actuators, accumulators, safety relief valves and orifice plates

8. MECHANICAL PRESERVATION INSTRUCTIONS AND CHECKLISTS

8.1 General

The following general notes should be read in conjunction with the check lists contained in this section.

For equipment or packages which may be exposed to damage, a temporary protecting cover of non-flammable material should be installed during the construction phase.

Open flexible hose connections shall be plugged.

Greased bearings shall be greased. Check supplier information.

All threaded openings shall be provided with steel caps or solid-shank steel plugs of metallurgy equal to the metallurgy of the component being capped or plugged.

All valves shall be preserved in both open and closed position, valves supplied for stock to be preserved for long term storage, all exposed valves spindles shall be covered with Teflon-based lubricant and vulcanizing tape. Gate valves shall be stored and installed in closed position, globe and ball valves shall be locked in open position. The preservation check lists for major mechanical equipment will/can be updated by the Contractor to incorporate supplier's requirements.

Mechanical packages will normally be split into various tagged items of all disciplines and linked to check lists.

Ensure that a correct type of Vapour Corrosion Inhibitor (VCI), normally Cortec VCI 101 or similar, will be applied and replaced according to the check lists.

Equipment coating should be checked regularly for damage and. Use preservation wax, where appropriate. Corrosion resistant materials such as stainless steel, Al-Bronze, Monel, etc. are NOT to be coated with any preservatives unless specifically called for.

Pipes and fittings when handled as bulk materials during the pipe fabrication and installation phase shall be preserved in accordance with check lists for piping items.

Carbon steel pipes that are internally sandblasted or chemically cleaned or pressure tested with water shall be preserved internally with VCI powder.

8.2 Checklists

Preservation Checklist no. Description

MP-01 Pumps, plate heat exchangers, tanks, vessels, separatorsand exchangers.

MP-02 Valves – Hand operated & check valves, ball valves, and globe valves, piping spools and piping systems

MP-03 Heating and cooling coils, fans, HVAC systems, hydraulic power packs, compressors, diesel engines

9. EXHIBITS

Exhibit PR-R-002A Example of Preservation LabelsExhibit PR-R-002B EP-01: Checklist – Electrical Motors, Generators,

Transformers Exhibit PR-R-002C EP-02: Checklist – Electrical EquipmentExhibit PR-R-002D EP-03: Check Record – Insulation ResistanceExhibit PR-R-002F JP-01: Checklist – Instrument EquipmentExhibit PR-R-002G JP-02: Checklist – Actuators and Accumulators,

Safety Relief Valves, Orifice PlatesExhibit PP-R-002H MP-01: Checklist – Pumps, Plate Heat

Exchangers, Tanks, Vessels, Separators and Exchangers, Equipment

Exhibit PR-R-002J MP-03: Checklist – Heating and Cooling Coil, Fans, HVAC System, Hydraulic Power Packs, Compressors. Diesel Engines

Exhibit PR-R-002K CC-A1-012: Preservation Check Sheet

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