CMM_Purchase_Discription.pdf

ROCK ISLAND ARSENAL RIPD: J9000-17-9-13

PURCHASE DESCRIPTION DATE: 08 March 2017

SHOP FLOOR COORDINATE MEASURING MACHINES

1. GENERAL SYSTEM DESCRIPTION:

The purpose of this purchase description is to define salient and performance characteristics required for the successful offeror to provide and set-up two (2) Shop Floor Coordinate Measuring Machines (CMMs) with an option for JMTC to purchase an additional one (1), or two (2) more identical shop floor measuring systems described herein. The portable CMMs shall be used in Building 220 at the Rock Island Arsenal Joint Manufacturing Technology Center (RIA-JMTC). The shop floor coordinate measuring systems will be used for in-process inspection of various end items and component parts manufactured by the RIA-JMTC.

2. STANDARDS AND PUBLICATIONS

2.1 Clarification

Any ambiguities, questions, requests for clarification or discrepancies between sections of this purchase description, drawings, national or industry standards discovered by the contractor in reviewing this purchase description shall be reported by the vendor in writing to the contracting officer BEFORE THE DATE SCHEDULED FOR CLOSE OF REQUEST FOR QUOTE.

Submission of a quote shall be construed as evidence that such examination has been made.

Therefore, later claims for labor, material, or equipment required, or for difficulties encountered, which could have been foreseen had such reasonable examination been made, may be denied.

2.2 National Standards and Specifications

The following specifications in effect on the Date of Request for Proposal form a part of this purchase description. In the case of conflicting requirements, the more stringent shall apply.

2.2.1 Occupational Safety and Health Act of 1970 (OSHA).

2.2.2 American Society of Testing and Materials (ASTM).

2.2.3 American Society of Mechanical Engineers (ASME).

2.2.4 American National Standards Institute (ANSI).

2.2.5 National Electrical Manufacturers Association Standards (NEMA).

2.2.6 Electronic Industries Association (EIA).

2.2.7 Institute of Electrical and Electronics Engineers (IEEE).

2.2.8 American Code for Information Exchange (ASCII).

2.2.9 National Fire Protection Association (NFPA).

2.2.9.1 NFPA-70 National Electrical Code

2.2.9.2 NFPA-79 Electrical Standard for Industrial Machinery.

2.2.10 International Standards Organization (ISO).

2.2.11 MIL-STD-130N, Identification and Marking of US Military Property

2.2.12 National Institutes of Standards and Technology (NIST)

3. DESIGN

3.1 Ownership

3.1.1 This equipment is a standard product of the manufacturer and shall require either no change or minor design changes to meet requirements of these specifications. Therefore, ownership of the design will remain with the manufacturer.

3.2 General Design Standards

3.2.1 DEVIATION FROM PRODUCT: Modifications to the manufacturer’s standard design to achieve requirements as specified in this document are only permissible as dictated by good design practice. For example, mounting a 20-hp motor in a power train designed and normally using a 10-hp motor would not be acceptable.

3.2.2 UNITS OF MEASURE: Dimensions and capacities in this purchase description are given in the English-US Standard (inch-pound) system, or metric units. All dials, gauges, controls and drawings provided as part of this equipment purchase shall be in the English-US system, or both the English-US and the metric systems, unless otherwise specified in this document.

3.2.3 ID DATA PLATE: The equipment shall include a main data plate which will include the following data as a minimum requirement (additional information is acceptable):

Manufacturer Name, Manufacturer’s Model Number, Manufacturer’s Serial Number, Year of Manufacture, Contract Number, and Machine Weight. This information is necessary for compliance with the governments Unique Identification Program (UID). The data plate shall also contain a two-dimensional (2D) matrix symbol representing a Unique Item Identifier (UII) registered by the contractor for the equipment provided in accordance with MIL-STD- 130N. The data matrix shall contain data elements in accordance with Construct #2.

Information and instruction on UII registration and 2D data matrix creation is available in Wide Area Workflow. Additional direction on creating, registering UII, and 2D data matrix is available at 703-848-7314, or by emailing info@uniqueid.org.

3.2.4 DATA PLATES: All instruction, data, and identification plates and labels attached to this equipment and its controls shall be manufactured of corrosion and oil resistant metal or plastic material. All wording shall be in the English language using plain, bold face lettering.

Lettering shall be permanent and have a contrasting background.

3.2.5 UTILITY CONNECTION: Equipment supplied to the Rock Island Arsenal will have single point shut-off for each utility supplied to a system. This means that equipment constituting a single system shall be wired to a single main electrical disconnect point, plumbed to a single pneumatic shut-off valve, etc… This will be referred to as the “point of first connection”. Each type of power source may have only one point of first connection.

E.g. (1) pneumatic shut-off valve, (1) water supply shut-off valve, (1) electrical disconnect, etc… Each point of first connection shall be clearly labeled on the system and shown in the safety lockout portion of the documentation package. These points must be located on a stationary component and positioned such that they will not create a hazard to personnel during normal operation of the system. The first connection points shall be accessible from the shop floor without the use of ladders, steps, or stools. Access cannot be hampered by operation of the system.

3.2.6 UTILITIES AVAILABLE: Rock Island Arsenal shall be responsible for providing the following:

3.2.6.1 Connection of 110-V, 60-Hz, 1-Ph AC electrical power to the fused or breaker type disconnect switch required in the ELECTRICAL DISCONNECT paragraph of this purchase description. Connection does not include filters, surge protection, electrical conditioning or any peripheral equipment necessary to make the equipment functional.

3.2.6.2 If, due to contractor caused problems, the equipment or components of the equipment must be moved or removed and replaced, by RIA after initial placement, the contractor shall be billed for such work at current RIA labor and overhead rates.

3.2.7 CONDUIT: Flexible conduit is not permitted in exposed areas. All wires, cables, and hoses will be enclosed by rigid, oil-proof protection, except where flexibility is necessary for operation of the equipment. Flexible wires, cables and hoses shall be arranged to prevent draping or tripping hazards.

3.2.8 SERVICE ACCESS: Components subject to periodic adjustment, replacement, or servicing shall be readily accessible. Meaning that experienced personnel can access the part after no more than 30-min of labor. If any special tools or equipment are necessary to access these components, said equipment will be supplied as part of the system and provided with a proper storage location within the system.

3.2.9 DEFLECTION: The system shall recover from distortion and deflection at no load.

The machine and its components shall be sufficiently rigid that work piece finish and tolerances are not impaired by machine vibration.

3.2.10 NEW EQUIPMENT: The equipment furnished under this purchase description shall be new and unused.

3.2.11 COMPONENT ENVIRONMENT: Under no circumstances shall a component be used in an application not recommended by the component manufacturer. Components shall not be subjected to conditions of operation beyond the recommendations of the manufacturer, such as excessive heat, lack of lubrication, over-loading.

3.2.12 REPLACEMENT COMPONENTS: All replaceable components shall be manufactured to definite standards for tolerance, clearance, and finish, enabling components to be field installed without further machining.

3.2.13 CASTINGS AND FORGINGS: All castings and forgings shall be free of defects, scale, and mismatching. No process such as welding, peening, plugging, or filling shall be used for reclaiming any defective part for use in this equipment without the prior written consent of the contracting officer.

3.2.14 SURFACE BUILDING AND COATINGS: Welding, brazing, soldering, coating or plating shall be employed only where specified in the original design. These operations may not be employed as a means of reclaiming a defective part.

3.2.15 FASTENING DEVICES: All screws, pins, bolts, and similar parts shall be installed in such a manner as to prevent change in tightness. Those devices subject to removal or adjustment shall not be swaged, peened, staked, or otherwise permanently deformed. They shall not be installed using permanent bonding adhesives.

3.2.16 CLEANING AND DEBURRING: All surfaces of castings, forgings, molded parts, stampings, and welded components shall be cleaned and free from sand, dirt, fins, flash, scale, flux, and other harmful or extraneous materials. All edges shall be either rounded or beveled unless sharpness is required to perform a necessary function. Except as specified herein, the condition and finish of all surfaces shall be commensurate with the manufacturer’s commercial practice.

3.2.17 PAINTING: All unfinished surfaces of the equipment shall be painted with a lead free and chromium free commercial grade of metal primer and a minimum of one finish coat. The color shall be in accordance with the manufacturer’s standard commercial practice, or as necessary to maintain compliance with OSHA regulations, as applicable.

3.2.18 LUBRICATION: Components specified as requiring lubrication by the original manufacturer shall have an appropriate means of providing said lubrication included in the design of the machine.

3.2.19 Equipment which requires a high quality constant power source shall have proper isolation and/or power conditioning equipment for the power service designated in this description. All electrical equipment shall have a power factor (ratio of real power to apparent power) of no less than 80%, as read at the equipment main disconnect. Equipment with a power factor of less than 80% shall be fitted with suitable power factor correction capacitance, sized on the basis of the equipment inductive AC load.

3.2.20 MOTORS:

3.2.20.1 All motors shall be rated for continuous duty.

3.2.20.2 Motors shall not operate in an overload condition during normal operation of the equipment and shall be equipped with overload protection.

3.3 Safety and Environmental

3.3.1 INDUSTRY AND REGULATIONS: The equipment shall comply with the most current of all local, state, and federal laws and regulations listed in Standards and Publications.

3.3.2 MATERIAL EXCLUSIONS: The equipment shall not contain polychlorinated biphenyl (PCB), ozone depleting substances (Class I or Class II), or asbestos materials.

3.3.3 SAFETY REGULATION COMPLIANCE: The contractor shall comply with standard OSHA and RIA safety standards.

3.3.4 SAFETY LOCKOUTS: Each point of first connection shall be designed and constructed to allow the utility to be completely isolated from the equipment. This isolation shall be insured by application of a standard key locking padlock. The device(s) shall only be lockable in the de-energized (OFF) condition.

3.3.5 TRAPPED ENERGY: Means shall be provided for the controlled release of stored energy. This energy may be in the form of, but not limited to, air and hydraulic pressure accumulators, capacitors, springs, counter balances and flywheels. When appropriate, a label shall be affixed to the stored energy source to identify the hazard.

3.3.6 EMERGENCY STOP: The system will incorporate a clearly identified, red, mushroomed, control button with a yellow backing plate at every operator work station. Upon momentary operation, any emergency stop button shall de-energize all machine motions and override all other controls without creating additional hazards. All motion stopped shall be restarted by the deliberate action of the operator (requiring manual reset). No other red mushroomed buttons shall be allowed on the equipment. It is preferred that there is no other red buttons of any type.

3.3.7 CONTROL GUARDS: Controls shall be guarded against accidental operation.

3.3.8 OPERATOR REACH: Controls shall be within reach and located such that the operator, when in the normal operating position, is not required to reach past moving parts, which may cause injury.

4. INITIAL PURCHASE, AND OPTIONAL PURCHASES

4.1 Initial Purchase: The Contractor shall provide, and set-up two (2) Shop Floor Coordinate Measuring Machines on the initial contract award.

4.2 Option 1: The Contractor shall provide and set-up one (1) additional Shop Floor CMM, identical to the initial quantity, and conforming to this purchase description. Exercising this option is at the discretion of the Contracting Officer and may occur up to one year after the initial contract award.

4.3 Option 2: The Contractor shall provide and set-up an additional two (2) Shop Floor CMMs, identical to the initial quantity, and conforming to this purchase description. Exercising this option is at the discretion of the Contracting Officer and may occur up to one year after the initial contract award.

5. EQUIPMENT SPECIFICATION

5.1 The Contractor shall provide and set-up complete portable coordinate measuring machines (CMMs) suitable for use in a shop floor production environment, and compact enough to fit through a standard man door. The units shall incorporate temperature compensation. The systems shall consist of at least the following components

5.1.1. CMM: The Base CMM shall be a Hexagon Model 4.5.4 SF. The CMM shall be a base model with 3-Axis of movement (not including the 2-additional axis detailed in the Automatic probing head). The available part measurement work envelope shall be at least 14” in the X-Axis direction, 20-inches in the Y-Axis direction, and 13.9-inches in the Z-Axis direction. The three axis of motion shall travel on linear bearings with each axis linear positioning read from Heidenhaim scales. The unit shall contain a granite block in the work area, and a threaded metal table to allow for part fixturing (with a variety of threaded threaded table fixturing inserts). Maximum part weight shall be at least 350-pounds. The unit shall contain a temperature sensor, and provide temperature compensation through the software, and machine control.

5.1.2. Metrology Frame (Portable, on swivel/fixed casters). Each shop floor CMM shall include a frame affixed to rolling casters, with a locking brake to stabilize the machine during measuring activities. The rolling frame shall also include a cabinet with adequate storage for controllers, accessories, and a Personal Computer (PC). The unit shall have an “operations light”, which will illuminate a various colors to denote when the unit is taking measurements, and when a unit is stopped (due to an error in the measuring program), or when the system is complete.

5.1.3. UMP-360 Controller

5.1.4. Universal Jogbox Base Unit

5.1.5. Renishaw PH10M Motorized Probe Head and accessories to include at least the following components (in quantities per Shop Floor CMM):

5.1.5.1. Renishaw Model PAA1 Adapter

5.1.5.2. Renishaw TP 20 Body

5.1.5.3. Renishaw Standard Force Modules (2 per Shop Floor CMM)

5.1.5.4. Renishaw Model PHC10 Probe Controller Box

5.1.5.5. All associated Power and Cabling for the Probing and Machine interfaces.

5.1.5.6. Probe Qualification/Calibration Sphere

5.1.5.7. Module Changing Rack

5.1.5.8. Demonstration Block

5.1.6. Calibration: The contractor shall calibrate the equipment, traceable back to National Institute of Standards and Technology (NIST) Standards, and install a calibration sticker on each machine, and provide a calibration certificate for each Shop Floor CMM.

5.2 Computer and Software:

5.2.1. Equipment: The contractor shall furnish all equipment normally considered by him to be standard for his machine unless identified in this requirement to be of specific manufacture. The following equipment shall be provided in addition to the equipment specified in other sections of this purchase description, which may not be standard. The inclusion of standard equipment in this paragraph is inadvertent and should not be construed to allow duplication.

5.2.2. Personnel Computer: The contractor shall provide a personal computer with each CMM to complement the Shop Floor CMM, capable of the performing all operations on the CMM and software menus, and providing all software graphics illustrations. The computer shall not be connected to the Army Network. The Computer shall contain the following minimum components. JMTC may add a printer to each measuring system. Components shall be allowed which are faster, or contain greater memory:

5.2.2.1 Processor: Core i5 Processors

5.2.2.2 Ram: 4GB, Non-ECC, 1333MHz, DDR3, 1X4GB

5.2.2.3 Hard Drive: 500GB 2.5, SAYA, 3.0Gb/s and 16MB Data Burst Cache

5.2.2.4 DVD: 8X DVD+/-RW SATA, Data Only

5.2.2.5 Graphics: Integrated Video HD Graphics

5.2.2.6 Operating System: Windows 7 Professional (32 Bit Operating System)

5.2.2.7. 5-inch Color Touchscreen Monitor.

5.2.2.8. PC-DMIS Pro Software, and PC-DMIS Tip Changer Software, pre-loaded.

5.2.2.9. Uninterrupted Power Supply

5.3 Machine Physical Dimensions, and Work Envelope:

5.3.1. Outside Machine Dimensions, Maximum: X=44-inches, Y=61.2-inches, Z=79.5-inches

5.3.2. Work Capacity, Minimums: X=24-inches, Y=43.3-inches, Z=18-inches

5.3.3. Measuring Capacities, Minimums: X=14-inches, Y=20.2-inches, Z=13.9-inches

5.3.4. Door Clearance: The equipment shall be shipped either assembled or disassembled to pass through a door 4-ft wide by 8-ft high, and shall not exceed 5-ft in length.

5.3.5 Component Weight: The maximum weight of any one piece shall not exceed 2,000-lbs.

5.3.6. Installed Floorspace: When installed complete, the equipment shall be contained in an area 7-ft wide and 7-ft long. Maximum height shall not exceed 10-ft. Width is defined as front to back from the operator’s normal operating position.

5.4. Accuracies: Accuracy of any measurement system is a function of atmospheric conditions, part geometry, and the part material composition. Subsequently, accuracies of the Shop Floor CMMs may be subject to the following conditions: Ambient Temperature Range:15-40°C., Standard temperature: 20°C, Maximum temporal variation: 2°C/hour and 10°C/day, and Maximum spatial variation: 1°C/m horizontal and vertical).

5.4.1. According to ISO 10360-2:2001:

a. The Maximum Permissible Error (MPEp(µm)) is the maximum error in measurement between two independent locations measured along the same axis measured in micrometers = 3.1+.05*ΔT+(3.0+.02*ΔT)*L/1000

MPEp(µm): 3.2µm

Where: ΔT is the departure of room temperature from 20-degrees Celsius, in degrees Celsius, & L is the variable length in mm

5.4.2. According to ASME B89.4.1b-2001:

R: 2.0 µm

Ay[L](µm): 6.4+.03*ΔT[300]

Where R is the repeatability in µm, and Ay[L](µm) Volumetric Accuracy µm.

5.5. Dynamic Specifications: The Shop Floor CMMs shall demonstrate the following travel speed capabilities:

5.5.1 Maximum 3D Velocity: At least 43 mm/second

5.5.2 Maximum 3D Acceleration: At least 1732 mm/second2

6. APPROVAL/SHIPPING

6.1 Shipping

6.1.1 RESPONSIBILITY: The contractor is responsible for delivery of the equipment to the Rock Island Arsenal. Adequate preserving of equipment surfaces, packing, marking, and skidding of materials for shipment shall be the responsibility of the contractor. If special lifting devices, such as hooks or eyes, are required for ease of handling, they shall be supplied with the equipment. Any special devices shall be returned to the contractor upon request only if they will not be required for future movement of the equipment, and at the contractor’s expense.

6.1.2 SHIPPING SCHEDULE: Deliveries and Service Calls will only be allowed from 0600-1530 hours. Be aware, the Rock Island Arsenal will only off-load equipment arriving between 7:00 am and 12:00 am (noon), local time on Mondays through Fridays except holidays. For information concerning holidays, the contractor should consult the contracting officer. These hours are subject to change, however, the Government will notify the contractor of such changes. Deliveries and service calls outside the normal hours stated above will be coordinated with the COR to address any emergency situations. The vendor will contact the designated COR to obtain an electronic key for their representative (i.e. delivery driver) in order to have access to the facility. There is no place to stage transporting vehicles awaiting the arrival of contractors. All equipment shall be delivered at the same time, meaning the same day (multiple trucks are acceptable) unless pre-authorized to deliver on multiple days by the RIA-JMTC contracting officer.

6.1.3 RECEIVER: All shipments to Rock Island Arsenal including installation tools and/or replacement parts, as well as the original shipment of the equipment, shall be marked “ATTN:

Mr. Joe Carpentier, TARA-PTP”. Items not correctly marked are subject to being returned at the vendor’s expense.

6.1.4 ARRIVAL INSPECTION: Upon receipt of equipment at Rock Island Arsenal, a preliminary inspection shall be performed to determine condition and/or count. This inspection shall be performed by Rock Island Arsenal personnel.

6.2 Installation

6.2.1 PREPARATION EXECUTION SUPPORT: Rock Island Arsenal will support the preparation portion of the installation by providing utilities to the points of first connection.

6.2.2 LABOR AND MATERIAL: The supplier is solely responsible for providing all labor, materials, hardware, tools, and equipment necessary for complete installation of this system except as specifically listed in this document as being provided by the Rock Island Arsenal.

6.2.3 SUPERVISION: Supervision of the installation process will be the responsibility of the contractor. Rock Island Arsenal shall retain the right to periodic inspection and evaluation of the process, as it deems necessary.

6.2.4 OFF-LOADING/PLACEMENT: Off-loading of the equipment from the delivery vehicle, and placement of the equipment in position for the installation is the responsibility of the contractor. The contractor shall not be allowed to use government equipment to accomplish this work.

6.2.5 OFF-LOADING/PLACEMENT OPTION: At the request of the contractor, Rock Island Arsenal will perform the off-loading and placement of the equipment.

6.2.5.1 Any special requirements or precautions to be observed shall be the responsibility of the contractor to provide.

6.2.5.2 The contractor or his representative may be present during this process; however, such person will be responsible for being present upon arrival of the equipment at Rock Island Arsenal. Off-loading and placement shall not be delayed to allow arrival of the contractor or his representative.

6.2.5.3 If, due to contractor caused difficulties, the equipment or components of the equipment must be moved, removed or replaced by Rock Island Arsenal after initial placement, the contractor shall be billed for such work at current Rock Island Arsenal labor and overhead rates.

6.2.6 LIABILITY: In any case, the equipment remains the property of the contractor, and the contractor shall assume all responsibility and liability for the equipment and the work performed upon it. The government shall be held harmless for any damage done to the equipment at any time up until final acceptance of the equipment by Rock Island Arsenal, except in the case of intentional damage and/or gross negligence on the part of Rock Island Arsenal personnel.

6.2.7 SET-UP: The contractor shall be responsible for set-up and connection of the equipment beyond connections of the utilities to the points of first connection.

6.3 Security: The Rock Island Arsenal-Joint Manufacturing and Technology Center is an Army Installation subject to Department of Defense safe guards, various precautions, and plant protection measures. At all times during the execution of this SOW, the contractor will maintain adequate plant protection devices to minimize espionage, sabotage, and other malicious destruction and damage. The contractor shall comply with all security requirements of the Rock Island Arsenal.

6.4 Completion

6.4.1 Final acceptance of the equipment shall occur after the following:

6.4.1.1 Set-up completion by the contractor.

6.4.1.2 Successful completion of performance testing at Rock Island Arsenal.

6.4.1.3 Final inspection approval by the government representative or inspector. This is to verify full compliance with this description to include amendments and modifications to the final contract. The government representative shall perform any and all tests he deems necessary to insure compliance with this description and industry standards to include, but not limited to ease of control, convenience of operation, safe operation, and adequacy of lubrication devices.

6.4.1.4 All required training is complete.

6.4.1.5 Complete documentation packages are delivered.

7. TRAINING

The contractor shall provide instruction in proper operation and maintenance of the equipment without additional cost to the government. Training shall be of sufficient duration that the recipients are able to demonstrate a reasonable level of competence as determined by the equipment installer and/or the inspector. Acceptance may be delayed as a result of inadequate training.

7.1 Schedule

Training shall be coordinated with the Rock Island Arsenal. Daily training shall begin no later than 6:30 a.m. CST and shall continue until at least 2:15 p.m. CST. This is required to get full coverage of the 1st shift of operation at RIA-JMTC. If training does not begin until after the stated time, RIA-JMTC may at its option require additional training at a different time to compensate for the loss of training caused by the late start. This may include more time than what is represented by the delay (e.g. a 1-hr delay may require 2-hrs later to impart the knowledge lost).

7.2 Location

All training shall be performed at the Rock Island Arsenal. It shall be performed using the equipment purchased in this description.

7.3 Type

Each type of training shall be given independently. Rock Island Arsenal shall coordinate with the contractor to provide the proper personnel for each type of training. The following types of training shall be provided by the contractor.

7.3.1 OPERATOR: Training shall be provided by the contractor for (5) operators. This shall include instruction on the safe, efficient operation of the equipment delivered. The trainees supplied by RIA-JMTC shall be familiar with PC-DMIS, but not necessarily with the style or type of controls provided with the equipment.

7.3.2 PROGRAMMING: If the equipment includes a programmable controller, programmer training shall be provided, separate from the operator training for (2) personnel.

If programming is normally performed by the operator only, then this training may be combined with the operator training.

7.3.3 MAINTENANCE: Mechanical and electrical control and diagnostic maintenance training shall be provided by the contractor. This shall include information on troubleshooting and preventive maintenance procedures. This shall be provided for (2) personnel.

8. SERVICE

8.1 Service/Support Requirements

The contractor shall have as a minimum, a verifiable service/repair capability which meets or exceeds the following requirements:

8.1.1 STAFF: Staffed by qualified, English speaking personnel fully knowledgeable in the service/repair of the equipment offered.

8.1.2 TELEPHONE ACCESS: Telephone access to service/repair personnel shall be available for consultation during Rock Island Arsenal normal working hours. Rock Island Arsenal normal working hours are 8:00 am CST to 3:00 pm CST, Monday through Friday, except legal federal holidays.

8.1.3 SCHEDULING WARRANTY MAINTENANCE: Scheduling for warranty repair shall be performed within 48-hrs of notification that warranty service/repair of the equipment is necessary. Warranty Repair shall be initiated within one week of the JMTC’s verbal notification that warranty service/repair of the equipment is necessary

8.1.4 MAINTENANCE PARTS: Parts necessary for periodic replacement such as belts, hoses, filters, and other parts normally considered as spare parts, by the manufacturer, shall be stocked and available for shipment.

8.1.5 PRIOR HISTORY: Said service/repair capability shall have been available to the general public prior to the issue date of this purchase description. Adequate proof of prior availability shall be provided upon request.