NRCS Colorado Documentation, Certification, and Spot Checking

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NRCS Colorado Documentation, Certification, and Spot Checking

     Natural Resources Conservation Service 720-544-2810 - Office State Conservationist 720-544-2965 - Fax 655 Parfet Street, Room E200C Lakewood, Colorado 80215

    Via Email Distribution



    AMENDMENT CO 09 (Part 407 Subpart B)

    SUBJECT: TCH-Documentation, Certification, and Spot Checking

    Purpose: To revise the Colorado Supplement to the General Manual about Documentation and Certification of Practices.

Effective Date: March 3, 2005

    Explanation: This amendment updates the Colorado Supplement to the General Manual for 450-GM, Part 407 - Documentation, Certification, and Spot Checking,

    Subpart B - Documentation and Certification.

Filing Instructions:

Remove and destroy pages: Insert pages

    CO407-6(1) CO407-6(1)

    CO407-6(2) CO407-6(2)


If you have any questions about this amendment, please contact the Agricultural

    Engineer at 720-544-2836.


    State Conservationist


FINAL:NRCS:ENG:DWOLFF:720-544-2836:cmc: 03/03/05

    Interdisciplinary Review: ____ENG; ____ ECS: ____; _____ ADM




Subpart A Policy

CO407.00. General CO407-2(1)

    CO407.01 Policy CO407-2(1)

    CO407.02 Responsibility CO407-2(1)

Subpart B Documentation and Certification

    CO407.10 Supporting Data CO407-6(1) CO407.11 Checking Completed Work CO407-6(3)


    (450-GM, Amendment CO09, March 2005)

    Part 407 Documentation, Certification and Spot Checking

    Subpart B Documentation and Certification


    ?CO407.10 Supporting Data

     (a) All documentation for practices planned and installed with NRCS assistance must be sufficient to show that the practice meets standards and specifications as described in the Section IV of the Field Office Technical Guide.

     (b) (1) Surveys and Notes. All surveys and notes will be kept in accordance with procedures set out in TR No. 62 and Chapter 1 of the Engineering Field Manual. Field sketches are a very important part of survey notes and should include location, alignment, and related information. Contract item number (CIN) must be shown on all field notes and computation sheets for all practices installed under long term contracts.

     (2) Design Computations. Computations for design shall be recorded on NRCS-ENG-522 and 523 computation paper or approved design forms for all jobs. Quantity computations shall be shown when needed for cost-sharing, reporting, and/or for cost estimating.

     (3) Plans and Specifications. Adequate drawings and specifications will be prepared for those jobs to be constructed on a bid basis or where they will clarify the design for construction purposes. The job identification, signature of the person with job approval authority, utility statement where appropriate, and signed acceptance by the cooperators will be shown on the service file copy of the construction plans.

     (4) Installation and Checking. Observations and measurements made during

    construction shall be recorded in the field notes or on the drawings to show that the work does or does not meet specifications. If the certifying technician is satisfied that all the work was done according to the construction plan, he/she may then complete the certification statement and sign to indicate his acceptance of the work. All supporting documentation shall be kept in the appropriate case file. Upon practice completion, proper notation shall be made on the Conservation Plan of Operations and/or contract.

     (i) Background. Field tests with Differential (with beacon signal) Global Positioning System (DGPS) have shown that the accuracy of these systems is as good as or better than our current methods of measurements. DGPS units properly used by trained personnel can meet current NRCS spot checking tolerances for practice certification. Supervisors shall ensure employees / individuals have sufficient training and competency using the DGPS system in collecting waypoints, measuring lengths, and measuring areas before using equipment for practice certification as per job approval authority.

    When collecting waypoints, it is recommended to use point averaging for a minimum of one minute to increase the accuracy of measurement.


    (450-GM, Amendment CO09, March 2005)

    Part 407 Documentation, Certification and Spot Checking


     (ii) Area Measurements. DGPS can be used to measure any area for

    practice certification provided the accuracy level calculated by the Garmin 76Map GPS unit is 12 feet or less and the PDOP is less than or equal to 6.

     (iii) Length Measurements. DGPS can be used to measure length for practice certification on slopes less than 15% provided the accuracy level calculated by the Garmin 76Map GPS unit is 12 feet or less and PDOP is less than or equal to 6. The minimum measurement length shall be 250 feet. If measurement length is less than 250 feet, use another approved method of measurement. If slopes exceed 15% for a portion of the measurement, the steeper slope length must be measured by another approved method or adjusted by using an appropriated slope adjustment factor (see example).

    2%slope % Slope Slope Adjustment Factor SlopeAdjustmentFactor1.0100(

     15 1.011

    Example: 16 1.013

     Pipeline planned downhill 17 1.014

     Start of Pipeline Elevation 8000 feet 18 1.016

    19 1.018 End of Pipeline Elevation 7500 feet.

    20 1.02 Distance measured with DGPS = 2000 feet

    21 1.022 80007500 % Slope = ;;10025%22 1.024 2000

    23 1.026 Slope Adjustment Factor = 1.031

    24 1.028 Actual Length of Pipeline = 2000 x 1.031 = 2062 feet.

     25 1.031 26 1.033

     27 1.036

     28 1.038

    29 1.041

     30 1.044

     35 1.059

     40 1.077

     45 1.097

    50 1.118 CO407-6(2)

    (450-GM, Amendment CO09, March 2005)

    Part 407 Documentation, Certification and Spot Checking


     (iv) Vertical Measurements. DGPS will not be used for vertical

    measurement for practice certification.

     (v) Verification of DGPS Data for Practice Certification. All

    area and length measurements obtained with DGPS units for practice certification must be downloaded into ArcGIS/Customer Service Toolkit for that cooperator by business name or ID, date, and subject. When ArcGIS/Customer Service Toolkit and/or DGPS equipment is used to certify a conservation practice, the Conservation Practice Certification Template (ArcGIS Layout) shall be used to document certification of all conservation practices.

    (c) Job sheets or other forms identified on the practice Statement of Work,

    Section IV, electronic Field Office Technical Guide will be used for

    supporting data.

?407.11 Checking Completed Work.

    (d) Documentation requirements for conservation practices will be determined

    by the Area Conservationist to ensure an effective practice has been

    planned and applied.

     (e) (1) An appropriate certification or guarantee form may be used by

    contractors or individuals to record appropriate information and measurements showing that specifications have been met.

     (2) Performance certification will be made by the responsible NRCS

    technician after the required installation certification and guarantee have been received or the NRCS has made a final checkout.


    (450-GM, Amendment CO09, March 2005)

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