2__garlock_aeromag_SOW_v2.pdf

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STATEMENT OF WORK

FIXED-WING AEROMAGNETIC SURVEY NEAR GARLOCK, CALIFORNIA

The Contractor shall furnish all labor, materials, and facilities, except as otherwise specified herein, required for conducting a manned fixed-wing aeromagnetic survey near Garlock, California (location map attached), to provide digitally recorded and processed aeromagnetic data in accordance with the terms, conditions, and specifications set forth in this contract. A target flight surface for the entire survey area must be determined and provided to the Technical Liaison prior to all flying. Differential GPS navigation is required for all areas.

1. AREAS TO BE FLOWN

Total-field aeromagnetic survey shall be flown along flight lines oriented east-west, spaced 600 m apart, and draped 305 m above ground. Perpendicular control (tie) lines shall be flown oriented north-south, spaced 6 km apart, and draped 305 m above ground to match elevations of east-west flight lines.

The “Core Area” of the survey is labeled A on the attached map. An “Add-On Area” is labeled B on the same map. Combined Area A+B is second priority (after Area A).

Area A consists of approximately 6,045 line miles (9,728 line km) and is bounded by the following polygon (UTM zone 10 meters, WGS84):

X Y 1036945 3872102 1007598 3866726 1000771 3872110 998703 3894400 982174 3892682 983590 3881196 945322 3880336 945433 3854331 899981 3865331 899982 3880664 950567 3913187 948164 3928940 951342 3947925 964501 3957410 989966 3919187 1009161 3900820 1040246 3877369 1036945 3872102

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Area A+B consist of approximately 23,616 line miles (38,007 line km) and is bounded by the following polygon:

X Y 1036945 3872102 1007598 3866726 1000771 3872110 998703 3894400 982174 3892682 983590 3881196 945322 3880336 945433 3854331 899981 3865331 887093 3869202 885874 3889500 839476 3891325 850683 3904967 810296 3945074 770982 3987218 747916 3986536 747371 4005198 858384 4012388 859704 3980198 955968 3984658 961740 3983434 964501 3957410 989966 3919187 1009161 3900820 1040246 3877369 1036945 3872102

Prospective contractors shall submit a firm-fixed-price proposal for flying Area A in its entirety and optional pricing for flying all or part of Area B subject to pricing and availability of funds. As stated above, combined Area A+B is second priority (after Area A).

2. FLIGHT SPECIFICATIONS

(a) Horizontal deviations from the planned (pre-flight) flight lines shall not exceed 10% of the designated flight-line spacing. Gaps between adjacent flight lines greater than 1.5 times the designated flight-line spacing for more than 3.2 line km require flying of intermediate flight line(s) in the intervening space.

(b) Maximum vertical deviations as indicated by GPS, and/or radar altimeter, and/or barometric altimeter shall be ±61 m from the pre-planned draped flight surface.

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(c) A pre-planned draped flight surface is required. The proposal shall describe the method used to calculate the surface. The proposal also shall include a general description of how areas of sudden high topographic relief will be flown. The contractor shall use real-time, differentially corrected GPS during flight to maintain this pre-planned flight surface within 61 m or better, safety permitting. The datum shall be WGS-84.

Upon award, the Contractor’s flight surfaces must be submitted to the Technical Liaison (TL) for approval prior to mobilization to the field. The flight surface data shall be accompanied by all relevant information necessary to evaluate the data.

(d) An aircraft capable of slow climb and descent shall be used in order to accurately drape the surface over topography. The aircraft’s ability to follow terrain will be a factor in proposal evaluations. Nominal terrain clearance shall be 305 m above ground. Deviations from this standard will be acceptable for safety, legal, and aircraft-performance reasons only.

The contractor shall obtain clearance(s) required for low-altitude flights as necessary. The contractor shall be responsible for obtaining clearances from all entities.

(e) Airborne survey data shall not be acceptable when gathered during magnetic storms or short term disturbances of magnetic activity, as indicated at the ground station. Specifically, the following conditions must be achieved:

1. A maximum tolerance of 3.0 nT (peak to peak) deviation from a long chord equivalent to a period of one minute.

2. In order to limit ULF waves (micropulsations), an additional maximum tolerance of 0.5 nT (peak to peak) deviation from a long chord equivalent to a period of 15 seconds.

3. DATA ACQUISITION SPECIFICATIONS

(a) Airborne magnetometer - Total intensity magnetometers used to perform the survey shall have a sensitivity of 0.1 nT or better. Values shall be obtained along flight lines and tie lines at intervals no greater than 10 m. The error envelope due to turbulence and the internal magnetometer noise shall not exceed ±0.1 nT for more than 10% along any line. The magnetometer shall be compensated for errors caused by the magnetic field of the aircraft such that (1) maneuver noise shall not exceed 3 nT for pitches or rolls of ±20o and (2) heading changes shall not cause a variation of more than 1 nT in the magnetic reading. It is preferred that the magnetometer be mounted in a tail-stinger, but wing-tip mounted magnetometers will be considered. If magnetometer is housed in a wing-tip, proposal shall include description of how wing vibration and additional noise will be compensated.

(b) Radar altimeter – A continuous digital recording of the radar altimeter data shall be obtained during all flights. It shall have a range from 0 to 1525 m above ground and be accurate to ±2%.

The absolute accuracy of the radar altimeter over flat terrain shall be specified and become a requirement. The methods used to calibrate the altimeter shall be specified and described in the final report. The altimeter shall be calibrated at the beginning of the survey and as often as required to ensure operation within specifications. The data shall be of sufficient quality to plot

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(c) Barometric altimeter - A continuously recording barometric altimeter shall be operated during all flights and be accurate to 2%. The altimeter shall be certified under FAA regulations.

(d) Stationary magnetometer - One or more continuously recording ground magnetometers shall be located within 80 km of all survey points to record time-varying magnetic fields, as follows:

A total intensity magnetometer shall be used to monitor the diurnal magnetic field and magnetic transients. Location(s) and site characteristics shall be described in detail. The magnetometer shall have a resolution of 0.2 nT or better, have absolute control of 0.5 nT or better and a noise envelope of less than or equal to 0.1 nT. It shall be located so that magnetic fields from man-made sources, such as vehicular traffic, do not exceed 1 nT. The field shall be sampled at less than or equal to 1-second intervals during all airborne data acquisition.

Digital recordings of the ground magnetometer made during times of data acquisition aboard the aircraft shall be available at all times during the survey. The digital data shall include the date, an absolute value of the magnetometer reading, and GPS time with accurate synchronization to the aircraft data acquisition system.

(e) Field Workstation Capability - The Contractor shall bring to the field a computer capable of processing and displaying collected geophysical data in order to determine data quality, calculating and displaying navigational information, including flight-line maps, producing page-sized preliminary magnetic maps, and copying and verifying digital data.

(f) Flight path recovery – A real-time differential GPS system shall be used for navigation.

Positioning accuracy shall be better than 4.5 m for distances of up to 80 km from a known reference point on the survey. The navigational information shall be recorded at 1 second intervals as Cartesian coordinates by the digital data acquisition system in a form that can be used for flight path recovery.

(g) Flight records - Digital recordings of the airborne magnetometer, radar altimeter, and GPS measurements shall be made at all times during the survey. Digital plots (if requested) shall be annotated to show flight line numbers and directions, the locations, time and fiducial number of the beginning and ending of each line, horizontal and vertical scales and an absolute value of the magnetometer and altimeter.

Any analog charts or plots shall be annotated to show flight, flight line number, and flight direction; the locations, time and fiducial number of the beginning and ending of each line;

horizontal and vertical scales; and an absolute value of the data channels. Post flight generated charts are not required.

4. DATA REDUCTION/PROCESSING SPECIFICATIONS

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(a) Flight path recovery shall be accomplished using differential GPS. The GPS data shall be processed to provide positions to an accuracy of 5 m or better. Positions shall be computed using WGS-84 datum and shall be included in the final deliverables.

(b) The total field airborne magnetometer data shall be corrected for diurnal variation, magnetic transients, and instrument drift. Diurnal corrections may be determined from the ground magnetometers when they are located within 80 km of the survey area.

(c) Magnetic anomaly maps shall be prepared by removing the 12th Generation International Geomagnetic Reference Field (IGRF-12) updated to the date of measurement (reference:

http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html).

IGRF values shall be computed at precise XYZ positions of observed field measurements. Since the IGRF is nonlinear, IGRF values shall be computed at horizontal intervals no larger than 15 minutes of latitude or longitude and at elevation intervals with no more than 5-nT of change in IGRF. Linear interpolation is permissible between these computed values.

Line leveling shall be done before the IGRF is removed so that the IGRF can be replaced by the Definitive Geomagnetic Reference Field (DGRF) in future years without having to re-level the data. Each correction shall be shown in the deliverable data set and documented in the final report.

5. CONTOUR MAP SPECIFICATIONS

Hard-copy contour maps are not required for this survey.

6. FLIGHT PATH MAP OR PROFILE SPECIFICATIONS

Flight path maps and stacked profiles are not required for this survey.

7. RADAR ALTIMETER MAP SPECIFICATIONS

Radar altimeter maps are not required for this survey. However, the radar altimeter data shall be of sufficient quality to plot radar maps and terrain maps.

8. QUALITY ASSURANCE/QUALITY CONTROL

The successful contractor is responsible for all quality control activities under this contract to ensure that data quality meets normal industry standards and the specifications contained herein.

Additionally, the contractor’s final report shall contain a discussion of quality control methods and procedures, and shall detail any errors found and corrective action taken.

(a) All geophysical and navigational equipment shall be checked, adjusted, and calibrated according to manufacturer's recommendations immediately before commencing data acquisition or within the time period specified by the manufacturer.

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(b) The magnetic field of the aircraft and its dependence on heading, yaw, pitch, and roll shall be determined prior to data acquisition and removed from field measurements in accordance with standard industry practices. The method of determination of and correction for aircraft field shall be described in detail in the final report.

(c) All data processing steps, models, and assumptions that correct, transform, alter, or change data in any way shall be described and included as part of the final report.

9. DIGITAL DATA SPECIFICATIONS

(a) All digital data shall be delivered in a standard ISO CD-ROM or DVD format.

(b) Each CD-ROM or DVD supplied shall have a unique visual label attached to allow correlation with supplied descriptive material of its contents including delivery date.

(c) The digital data shall not introduce noise beyond the noise specifications of the instrument supplying the data (e.g. the airborne magnetometer).

(d) If any digital CD-ROM or DVD supplied conforming with the contracted characteristics cannot be read by USGS computers, additional copies shall be supplied at no extra cost until a completely successful reading of the data is performed.

(e) Each CD-ROM or DVD delivered shall contain a Readme file for each data set listing and describing in detail the channel headers for the data.

10. DELIVERABLE ITEMS

The Contractor shall furnish the following data f.o.b. to the USGS destination:

(a) Original of all airborne magnetometer, ground magnetometer and altimeter analog charts resulting from the survey.

(b) All written or recorded electronic navigation information that was used to position the track of the aircraft.

(c) Original of all digital magnetic tapes, DAT tapes, and CD-ROMs recorded during the survey.

(d) If the original digital data taken in the aircraft are not recorded on CD-ROM in standard ISO format, then copies/transformations of these data shall be supplied in the required format.

(e) Two copies of digital data on CD-ROM or DVD containing the original (raw) flight line data and the final corrected data. These records shall be provided as a Geosoft database or as an ASCII file in Geosoft XYZ format. Each record shall contain the following fields:

(1) An integer flight line ID, with no embedded spaces, as the first item in the record.

(2) Flight line direction in degrees from North.

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(3) Longitude to nearest 1/100,000th of a degree; longitude in the U.S. is negative

(WGS84).

(4) Latitude to nearest 1/100,000th of a degree (WGS84).

(5) UTM Zone 11 X coordinates (m), WGS84.

(6) UTM Zone 11 Y coordinates (m), WGS84.

(7) Sample (fiducial) number that is related to numbers on flight path maps.

(8) Year and Julian date (YYYY/DDD) when measurement was made.

(9) Time of day when measurement was made to nearest 1/100th second (HH:MM:SS:SS).

(10) Height above ground (radar altimeter) to nearest m or better.

(11) Barometric altitude of aircraft to nearest m or better.

(12) GPS Elevation of magnetometer to nearest m or better.

(13) Magnetic reading at stationary base station interpolated to the time of aircraft measurement to nearest 0.01 nT.

(14) Uncorrected total field magnetic intensity to nearest 0.01 nT.

(15) Total field magnetic intensity to nearest 0.01 nT corrected for time-varying field.

(16) Total field magnetic intensity (from item 15) after leveling on the basis of flight line and tie line crossings.

(17…) Any other corrections made and resulting data after each filtering or leveling process has been applied (as determined by contractor and fully described in final report).

(Final) Residual total magnetic intensity to nearest 0.01 nT after removal of IGRF

(f) Two copies of digital data on CD-ROM or DVD that contain gridded magnetic values obtained from the final, completely reduced and corrected data shall be delivered for each area. The grid origin shall be at the lower left corner. The grid interval shall be no less than one-fifth and no more than one-half of the specified flight line spacing. The grid shall be provided as a Geosoft grid, ASCII gxf grid format, or some other mutually agreed upon ASCII grid format.

The readme or header file shall contain:

Map Projection Information

(1) Project name as specified in the contract

(2) Projection name (i.e., UTM and zone number). UTM projection is preferred for the conterminous U.S.

(3) Datum (WGS84, NAD27,NAD83, etc.)

(4) Base latitude

(5) Central Meridian (negative west longitude)

(6) False Easting (m)

(7) False Northing (m)

(8) Any other map projection information needed to reproduce the projection.

Grid Information

(1) Origin of grid (Easting, Northing in m)

(2) Grid interval (dx, dy in m)

(3) Location of the grid value within the cell

(4) Rotation of grid if applicable

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(g) A digital file that contains the gridded radar altimeter values which can be used to produce radar altimeter contours maps.

(h) A partial printer listing (i.e., 3 records) of each data file shall be provided. The fields shall be labeled.

(i) Two hard copies of an operational report for each area that shall include the following:

(1) Flight logs indicating production times, lines flown, operational problems, and other relevant data.

(2) Records documenting accuracy of navigation system.

(3) Records of the latest compensation test flights.

(4) Records of all instrument calibrations.

(5) Location(s) of the magnetic ground monitor.

(6) Types of equipment used (aircraft, magnetometer, radar altimeter, barometric altimeter, camera, electronic positioning system, and ground magnetometer).

(7) A list of files supplied including the format and content of the files on the CD-ROM(s) requested above.

(8) Descriptions of data acquisition and compilation procedures including type of gridding algorithm, method used for leveling, QC/QA procedures.

(9) Projection and datum conversion methods.

(10) If applicable, exact length of tow-cable and the bird lift-airspeed function.

(11) Any other information deemed essential by the Contractor.

(j) One digital copy of the explanatory text of the operational report (flight logs, company profiles, equipment literature, and most figures may be excluded) in MSWord 2000 or later.

11. ADDENDUM TO FAR 52.212-4(a), INSPECTION/ACCEPTANCE

(a) Before mobilization, the USGS shall be given a copy of the flight plan including the preplanned flight surface for discussion and approval. In addition to the inspection/acceptance rights outlined in FAR 52.212-4, the USGS reserves the right to visit the contractor in the field to observe survey data acquisition and reduction procedures or to visit the contractor at the contractor's place of business to ascertain that proper procedures are being employed in compiling the data. Any data processing or field techniques that are deemed proprietary by the contractor will be maintained proprietary by the USGS inspector(s).

(b) During the course of the survey, the flight crew will maintain regular and reliable contact with the TL. Preliminary data and field operation reports shall be sent to the TL weekly via overnight mail, e-mail, or computer network to an ftp site.

(c) Preliminary digital flight-line data, base station magnetic measurements, and radar altimeter data shall be submitted at the time the flying is completed for each area via overnight mail, e-mail, or computer network to an ftp site. The flight crew will remain in the field while the preliminary data is reviewed. This review will take no longer than 24 hours after the TL receives the data.

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Final preliminary digital data shall be submitted within forty-five (45) days after the completion of flying. The USGS will conduct its review of the revised set of the digital data and maps within fourteen (14) calendar days after receipt of the above described revised data. (See Section 15 below for period of performance).

(d) If the Government review exceeds the fourteen (14) day period referenced in Item (c) above, the contract delivery date shall be automatically extended one (1) day for each day of delay caused by the Government review.

(e) The contractor shall then have thirty (30) days to correct all errors or problems the Government may have found in its review of revised preliminary data (Item (c) above) and submit all final deliverables for each survey group as listed in Section 10 above, to the address in Section 14 below.

(f) With the submittal of all final deliverables as listed in Section 10 above, the contractor shall have met all criteria as specified herein and shall have made all corrections required resulting from the Government. The Government reserves the right to review again the deliverables for compliance prior to final acceptance by the Contracting Officer. Until final acceptance, deliverables may be returned to the contractor for compliance with corrections listed during the Government's review in Items (c), (d), and (e) above.

12. PRESERVATION, PACKAGING, PACKING, AND MARKING

Preservation, packing, packaging, and marking for shipment of deliverable items called for by the contract shall be in accordance with the best commercial practice to assure acceptance by common carrier at the most economical rate(s).

Packages containing software or other magnetic media shall be marked on external containers with a notice reading substantially as follows: “CAUTION: SOFTWARE/MAGNETIC MEDIA

ENCLOSED. DO NOT EXPOSE TO HEAT OR MAGNETIC FIELDS.”

13. INSPECTION PERIOD

Due to the complexity of items to be furnished hereunder, inspection and acceptance/rejection of deliverable items cannot be accomplished in 7 days. Accordingly, the “constructive acceptance” period contemplated by the Prompt Payment Act (see FAR 52.212-4(i)(2)) is increased to fourteen

(14) days. See Section 11, items (c), (d), and (f).

14. PLACE AND METHOD OF DELIVERY

(a) The delivery point for all deliverables is:

U.S. Geological Survey, Geology, Minerals, Energy, and Geophysics Science Center MS 989, Building 2 345 Middlefield Road

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Menlo Park, California 94025 Attn: Victoria Langenheim

(b) Prices to be F.O.B. Destination.

15. PERIOD OF PERFORMANCE

(a) Flying

Flight operations shall begin within forty-five (45) calendar days after contract award or by an agreed upon schedule with the USGS Technical Liaison and be completed within forty-five (45) calendar days after flying has commenced.

(b) Preliminary Copies

Preliminary digital flight-line data shall be submitted at the time the flying is completed for each area (see Section 11, item (c), above). Revised preliminary digital data sets shall be submitted within forty-five (45) calendar days after flying for each area is completed. These completed data in rough draft form shall be submitted before the final maps and CD-ROMs are prepared, for the purpose of inspection and to resolve any problems prior to preparation of the completed final data.

(c) Final Deliverables

All final products shall be delivered within seventy-five (75) calendar days after flying has been completed.

16. SPECIAL CONTRACT REQUIREMENTS

(a) Indemnity

The contractor herein is an “independent contractor” and shall obtain all necessary insurance to protect himself from liability arising out of this contract.

The contractor hereby agrees to indemnify and hold the Government harmless in connection with, any loss or liability from damage to, or destruction of, property or from injuries to, or death of, persons (including the agents and employees of both parties) if such damage, destruction, injury or death arises out of, or is caused by performance of work under this contract, unless such damage, destruction, injury or death is caused solely by the active negligence of the Government, its agents or employees. The contractor agrees to include this clause, appropriately modified, in all subcontracts to be performed under this contract.

Proof of insurance must be included with the contractor’s proposal.

(b) Permits and Licenses -- General

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In the performance of work hereunder, the Contractor shall obtain and maintain in effect all necessary permits, visas, and licenses required by Federal, State, or local government, or subdivision thereof, or of any other duly constituted public authority. At no separate or additional cost to the government, the contractor shall comply with all laws and regulations applicable to work to be performed hereunder, including any revised statutes or regulations effective during the life of the contract.

(c) Applicable Regulations and Permits -- Aircraft Operations

(1) All aircraft used in the performance of the work under this contract shall be maintained and operated in accordance with all required Department of Transportation, Federal Aviation Administration (FAA) regulations, including Title 14, Code of Federal Regulations Part 375 entitled, “Navigation of Foreign Civil Aircraft within the United States,” published 3/3/86.

Additional or separate charges may not be made under this contract for compliance with FAA regulations, including any revisions made since 1986 and during the life of the contract.

Certificates of airworthiness for the proposed aircraft must be included in the proposal.

(2) When the project falls under controlled air space, the contractor shall contact the appropriate Air Route Traffic Control Center.

(3) If the project area includes all or part of a military installation or other sensitive or classified area, the contractor must comply with all security regulations associated with taking, reproducing, or distributing photographs of these facilities, and must satisfy Department of Defense (DOD) security requirements specified in DOD 5220.22M, “Industrial Security Manual for Safeguarding Classified Information.” The contractor may be required to visit the installation to obtain necessary clearance from the military commander. Difficulty obtaining the necessary clearance should be reported to the TL and Contracting Officer immediately. All photographic materials resulting from photography of classified areas shall be handled, stored, and shipped in accordance with applicable security regulations.

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