Sec. 1728.202 RUS Bulletin 1728H-702, RUS Specification for Quality
Control and Inspection of Timber Products.
(a) Scope. This specification describes in more detail the
responsibilities and procedures pertaining to quality control for
crossarms, as specified in Sec. 1728.201 of this part, and poles,
covered in RUS Bulletin 1728F-700, incorporated by reference in
Sec. 1728.97 of this part and in Sec. 1755.97 of 7 CFR part 1755.
(b) Related specifications and standards incorporated by reference.
The following specifications and standards referenced throughout this
section are incorporated by reference. This incorporation by reference
is approved by the Director of the Federal Register in accordance with 5
U.S.C. 552(a) and 1 CFR part 51. Copies of each are available for
inspection during normal business hours at RUS, room 1250-S, U.S.
Department of Agriculture, Washington, DC 20250 or at the Office of the
Federal Register, 800 North Capitol Street, NW., suite 700, Washington,
DC. Copies of these standards and specifications may be purchased from
the addresses shown below.
(1) American Wood-Preservers' Association (AWPA), Book of Standards,
1991 edition, available from AWPA, P.O. Box 286, Woodstock, Maryland
21163-0286.
(i) A1-91, Standard for Coal Tar Creosote for Land and Fresh Water
Use.
(ii) A2-91, Standard Methods for Analysis of Waterborne
Preservatives and Fire-Retardant Formulations.
(iii) A3-91, Standard Methods for Determining Penetration of
Preservatives and Fire Retardants.
(iv) A5-91, Standard Methods for Analysis of Oil-Borne
Preservatives.
(v) A6-89, Method for the Determination of Water and Oil-Type
Preservatives in Wood.
(vi) A7-75, Wet ashing Procedure for Preparing Wood for Chemical
Analysis.
(vii) A9-90, Standard Method for Analysis of Treated Wood and
Treating Solutions by X-Ray Emission Spectroscopy.
(viii) A11-83, Analysis of Treated Wood and Treating Solutions by
Atomic Absorption Spectroscopy.
(ix) C1-91, Standard for Preservative Treatment by Pressure
Processes All Timber Products.
(x) C4-91, Standard for the Preservative Treatment of Poles by
Pressure Processes.
(xi) C8-91, Standard for the Full-Length Thermal Process Treatment
of Western Red Cedar Poles.
(xii) C10-91, Lodgepole Pine Poles--Preservative Treatment by the
Full-Length Thermal Process.
(xiii) C12-90, Western Larch Poles--Full-Length preservative
Treatment by Thermal Process.
(xiv) M1-90, Standard for the Purchase and Preservation of Forest
Products.
(xv) M2-91, Standard Instructions for the Inspection of Preservative
Treatment of Wood.
(xvi) M3-81, Standard Quality Control Procedures for Wood Preserving
Plants.
(xvii) M4-91, Standard for the Care of Preservative-Treated Wood
Products.
(xviii) P1/P13-91, Standard for Coal Tar Creosote for Land and,
Fresh Water and Marine (Coastal Water Use).
(xix) P5-91, Standards for Water-Borne Preservatives.
(xx) P8-91, Standards for Oil-Borne Preservatives.
(xxi) P9-91, Standards for Solvents for Organic Preservative
Systems.
(2) American Institute of Timber Construction (AITC) 200-83,
Inspection Manual, 1987 edition, available from AITC, 333 West Hampden
Avenue, Englewood, Colorado 80110.
(3) American National Standards Institute (ANSI) 05.2-1983, American
National Standard for Wood Products--Structural Glued Laminated Timber
for Utility Structures, available from ANSI, 1430 Broadway, New York,
New York 10018.
(4) American National Standards Institute/American Institute of
Timber Construction (ANSI/AITC) A190.1-1983, American National Standard
for Wood Products--Structural Glued Laminated Timber, available from
ANSI, 1430 Broadway, New York, New York 10018.
(5) American Society for Testing and Materials (ASTM) D9-87 (1992),
Standard Terminology Relating to Wood, available from ASTM, 1916 Race
Street,
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Philadelphia, Pennsylvania 19103-1187, telephone number (215) 299-5585.
(c) General stipulations. (1) Each RUS electric borrower shall
submit to the Director, Electric Staff Division, Rural Utilities
Service, room 1250-S, 14th and Independence Avenue, SW., Washington, DC
20250-1500, in January of each year a list of plants from which it
obtained poles or crossarms during the preceding calendar year.
(2) Ultimate quality control is the responsibility of the producer's
management; however, a member of the producer's staff shall be
designated quality control designee and charged with the responsibility
for the exercise of proper quality control procedures. The requirements
in American Wood Preservers' Association (AWPA) Standard M3, covering
records, adequate laboratory, plant gauges, and other plant facilities
including proper storage, shall be followed.
(3) The methods of inspection described in this section shall be
used no matter which plan timber products are purchased under, i.e.,
Insured Warranty Plan, Independent Inspection Plan, or Quality Assurance
Plans as described in Sec. 1728.201 of this part or RUS Bulletin 1728F-
700. The number of poles and crossarms actually inspected by monitors
for quality control under a Quality Assurance Plan or the Insured
Warranty Plan may vary from the number of poles and crossarms inspected
under the Independent Inspection Plan. Under the Independent Inspection
Plan, each pole and a sample number of crossarms shall be inspected.
(4) Under the Independent Inspection Plan, the RUS borrower should
designate in the purchase order which inspection agency it has selected.
Unless the RUS borrower contracts for inspection as a separate
transaction, the treating company shall obtain the services of the RUS
borrower's designated inspection agency. For reserve treated stock for
purchase under the Independent Inspection Plan, the treating company
shall obtain the services of an inspection agency. Selection of and
changes in inspection agencies for reserve treated stock shall be
promptly reported to the Director, Electric Staff Division, Rural
Utilities Service, Washington, DC 20250-1500, in accordance with RUS
Bulletin 1728F-700, and Sec. 1728.201.
(5) Individual inspectors in the employ of Independent Inspection
Agencies shall be experienced and competent. The inspector shall perform
all phases of the inspection personally and in the proper sequence. The
primary responsibility of the inspector is to determine, for the
borrower, by careful inspection and verification, that the timber
products, preservative, and treatment meet the requirements of RUS
Bulletin 1728F-700 and Bulletin 1728H-701 and that the methods, storage
facilities, and production equipment conform to applicable RUS
specifications. For details of the recommended inspector's
qualifications see appendix A of this section.
(6) Laminated materials for use on RUS borrower systems shall follow
manufacturing and quality control requirements as specified in ANSI
05.2--1983, American National Standard for Wood Products--Structural
Glued Laminated Timber for Utility Structures, and ANSI/AITC A190.1-
1983, American National Standard for Wood Products--Structural Glued
Laminated Timber. The product shall be marked and certified.
(i) Laminated material shall be inspected by a qualified inspection
and testing agency.
(ii) Quality control of material shall be performed to determine
conformance with Sec. 1728.201 of this part and AITC 200-83, Inspection
Manual.
(d) Quality control and inspection procedures for product
acceptance. It is the responsibility of the plant quality control
designee to perform the following procedures to insure that a particular
lot of material conforms to the requirements of the applicable RUS
specification prior to treatment. After the plant quality control
designee has performed these procedures, a particular lot of material
shall be released to the inspector for verification of conformance.
(1) Poles can be purchased under any of the three purchase plans.
These plans are Insured Warranty Plan, Independent Inspection Plan, or a
Quality Assurance Plan. Under the Independent Inspection Plan, all poles
in a lot shall
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be inspected. Under the Insured Warranty Plan and a Quality Assurance
Plan, the number of poles in a lot actually inspected may be less than
every pole, depending on the terms of the plans.
(i) Ample space and assistance shall be provided by the treating
plant for handling and turning to insure that the surfaces of all items
can be adequately inspected.
(ii) Under the Independent Inspection Plan, all poles shall be
inspected for conformance to the requirements of RUS Bulletin 1728F-700.
If a pole is rejected and the cause of rejection is corrected, the
rejected pole may be offered again for inspection as new material.
(iii) Dimensions, length, and circumference shall be measured by a
standard steel pole tape to determine that they are in agreement with
the details for class and length in the brand and butt stamp. If it is
obvious by visual comparison with a measured pole that the brand
information is correct, individual poles need not be measured. Pole
circumference dimensions made prior to treatment shall govern
acceptance. Reduction in dimension due to treatment and shipping shall
be not more than 2 percent below the minimum for the pole class.
(iv) If 15 percent of the poles in a lot offered for inspection are
defective, the inspector shall terminate the inspection. Re-examination
of an entire lot by plant quality control shall be required when the
number of rejected poles equals or exceeds 15 percent of the lot
inspected. All defective or nonconforming poles either shall be removed
from the lot or marked out.
(v) Poles in a lot inspected for decay shall be of the same
seasoning condition. If the independent inspector suspects that decay
has occurred, he shall cut a slice from both ends for closer
examination. If 5 percent of the inspected poles in a lot shows evidence
of decay, the entire lot shall be unconditionally rejected without
further sorting.
(vi) Moisture content, when limited by the purchaser, as stated on
the borrower's purchase order, shall be measured by calibrated electric
moisture meter. Calibration of the meter shall include not only the zero
settings for the X and Y readings, but also two resistance standards for
12 and 22 percent moisture content.
(vii) Material failing to conform for moisture content may be
retested upon request after a recalibration of the instrument. The
results of the second test shall govern disposition of the lot.
(viii) Re-examination for any mechanical damage or deterioration and
for original acceptance shall be conducted on timber products not
treated within 10 days after original inspection.
(2) Crossarms can be purchased only under either of two purchase
plans. These plans are the Independent Inspection Plan or Quality
Assurance Plans. Under the Independent Inspection Plan, crossarms are to
be inspected prior to manufacture, during manufacture, and after
treatment. Under a Quality Assurance Plan, crossarms are monitored
according to the terms of the quality assurance program acceptable to
RUS.
(i) Inspection prior to treatment shall include:
(A) Surface inspection of all ends of all arms. This is usually done
on the stacks of arms prior to manufacture. Particular attention shall
be paid to defects commonly found in the ends, such as compression wood,
red heart and other forms of decay, shakes, splits, through checks,
scantiness, honeycomb, and low density, determined by rings per inch
(centimeter) and percent of summerwood. Whenever the number of
nonconforming arms is found to exceed 0.5 percent of the lot or one arm,
whichever is greater, the entire lot shall be rejected for excess number
of defective ends. After the producer has removed or marked out the
defective material, the arms may be resubmitted for inspection.
(B) Surface inspection of the lengthwise sides performed on a random
representative sample. The sample size shall equal 20 percent of a lot
size or 200 arms, whichever is smaller. The inspector shall examine side
surfaces as they are slowly rotated. When necessary, the rotation may be
stopped for closer inspection. Whenever the number of nonconforming arms
is found to exceed 2 percent of the sample size, the entire lot shall be
rejected. After the producer has removed or marked out
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the defective material, the arms may be resubmitted for inspection.
(C) Check of moisture content of the random sample by a calibrated
moisture meter.
(D) Check of crossarm dimensions of the random sample measured after
surfacing.
(ii) Inspection during manufacture shall consist of:
(A) Checking bolt and insulator pin holes for squareness and
excessive splintering;
(B) Checking brands for completeness, location, and legibility; and
(C) Checking arms for conformance.
(iii) Under the Independent Inspection Plan, there shall be a final
inspection during and after treatment for preservative retention and
penetration and for damage.
(3) Structural glued laminated timber shall be tested and inspected
in accordance with AITC 200-83, Inspection Manual. Grade of lumber shall
be inspected by a qualified grader for specified quality, and so marked,
in accordance with grading rules of the American Lumber Standards.
Adhesives used for all structural arms shall meet requirements of ANSI
05.2-83, paragraph 5.2. Melamine urea adhesives shall not be used. End
joint spacings and limitations shall be in accordance with ANSI 05.2-83.
(e) Preservatives. (1) Creosote shall conform to the requirements of
AWPA Standard P1 when analyzed by AWPA Standard Al, sections 2, 3, 4,
either 5 or 9, and 6.
(i) Each occasional charge, all material treated in a cylinder at
one time, shall be analyzed.
(ii) The first charge and one of every five charges randomly
selected in consecutive charges shall be analyzed.
(2) Solutions of waterborne preservatives shall be analyzed for
components in accordance with AWPA Standards A2, A9, or A11, and shall
meet the requirements of P5 for composition. AWPA A2 shall be used as a
referee method.
(3) Pentachlorophenol shall contain not less than 95 percent
chlorinated phenols and conform to AWPA Standard P8 in hydrocarbon
solvent AWPA P9 Type A.
(4) Copper Naphthenate in hydrocarbon solvent (AWPA P9 Type A) shall
contain not less than 6 percent nor more than 8 percent copper in the
form of Copper Naphthenate and conform to AWPA Standard P8 when analyzed
in accordance with AWPA Standard A5.
(f) Plant facilities and inspection during treatment. (1)
Manufacturing and treating plant facilities shall conform to AWPA
Standard M3, paragraph 3. Pressure plants shall be equipped with
recording instruments to register time, pressure, temperature and vacuum
during each cycle of treatment. They shall also be equipped with
indicating thermometers and pressure and vacuum gauges to check the
accuracy of the recorders. Work tanks shall be equipped with a
thermometer. Thermal treating vats shall be equipped with a time and
temperature recorder and with an indicating thermometer. Temperature
recording devices are not mandatory for plants treating exclusively with
waterborne preservatives.
(2) Under the Independent Inspection Plan, the inspector shall be
present during the treatment procedure, except at times when it may be
impractical, such as during late night or early morning treatments. At
such times, temperature, pressure, and vacuum data shall be taken from
the recording charts.
(3) Recording instruments shall be checked with indicating gauges
and thermometers. Inaccuracies shall be referred to the treating company
for prompt correction. In the event of an inaccuracy, indicating
possible damage to the material, the inspector shall reject the charge.
(g) Results of treatment. (1) Poles shall be tested for retention
and penetration by means of a calibrated increment borer 0.2 inches
(0.51 cm) [plusmn]0.02 inches (0.05 cm) in diameter in accordance with
procedures in AWPA Standard M2, paragraph 5.22. Under the Independent
Inspection Plan, all treating charges shall be tested for retention and
penetration. Plant quality control and independent inspection shall do
their analyses separately. Under the Insured Warranty Plan and Quality
Assurance Plans, the frequency of testing retention and penetration may
vary according to the plan.
[[Page 301]]
(i) Western red and northern white cedars and western larch poles
shall be bored at any point of the periphery approximately 6-12 inches
(15.24-30.48 cm) above ground line and all other species approximately 1
foot (30.48 cm) above or below the brand.
(ii) Penetration shall be determined in accordance with AWPA
Standard A3. Chrome Azurol S and Penta-Check shall be used to determine
penetration of copper containing preservatives and penta, respectively.
(iii) Retention sampling. (A) When there are 20 or more poles in the
treating charge, the retention sample for creosote shall consist of 20
assay zones from southern pine and Douglas-fir poles. All poles in
charges with fewer than 20 poles shall be bored once. Charges with less
than 15 poles shall be bored once and bored again on a random basis to
obtain a minimum of 15 assay zones.
(B) Retention samples shall be taken from 20 poles in charges of 20
or more poles.
(C) Retention samples for Alaska yellow, western red, and northern
white cedars shall be comprised of a minimum of 30 assay zones for
creosote and waterborne preservatives. For penta charges of fewer than
30 poles, the sample shall contain the assay zone from each pole in the
lot.
(D) Retention samples shall be comprised of borings, representative
of pole volumes for each class and length in the charge. Further
selection and marking of poles of mixed seasoning, volume, and location
on the tram shall be made as illustrated in the following table:
------------------------------------------------------------------------
Vol. Number
Number of Poles Class/Length in cu. Total of
ft. Volume Borings
------------------------------------------------------------------------
27 7/30(09.1 m) 232 15 3
26 4/35(10.7 m) 447 29 6
11 5/35(10.7 m) 163 10 2
55<SUP>[ast]</SUP> 6/35(10.7 m) 704 46 9
--------
Total.............. ................ 1,546 ...... .......
------------------------------------------------------------------------
*If a portion of these poles were green and some partially seasoned,
then the number of borings should reflect the approximate percentage
of each.
(iv) When material in a lot consists of fewer pieces than the
designated minimum number of samples for assay, additional borings shall
be taken so as to make up at least the minimum sample, and in such
manner that the sample is representative of the lot of material with
respect to any variations in size, seasoning condition, or other
features that might affect the results of treatment.
(v) Analyses for preservative retention shall be performed.
(A) Creosote shall be analyzed by AWPA Standard A6.
(B) Penta shall be analyzed by AWPA Standard A5 or A9. Copper
pyridine method is required when timber may have been in contact with
salt water and for all species native to the Pacific coast region,
unless the raw material invoice specifically states that the material
either has not been in contact with salt water or has been shown by
analysis to have contained no additional chlorides before treating.
(C) Copper Naphthenate shall be analyzed by tests in accordance with
AWPA Standards A5 or A9.
(D) Waterborne preservatives shall be analyzed by tests in
accordance with AWPA Standards A2, A7, A9, or A11.
(E) Prior to unloading a tram, the inspectors may take their own
samples and analyze them concurrently with the quality control designee,
but each shall work independently, and quality control data shall be
presented before acceptance of the charge.
(vi) Penetration sampling of poles. (A) Group A poles consist of
poles with a circumference of 37.5 inches (95.25 cm) or less at 6 feet
(1.8 m) from butt.
(1) Bore 20 Group A poles or 20 percent of the poles, whichever is
greater. Accept if 100 percent of the sample conform; otherwise, bore
all poles.
(2) Re-treat the charge if more than 15 percent of the borings are
found to be nonconforming.
(3) Re-treat all nonconforming poles if 15 percent or fewer fail the
requirement.
(B) Group B poles consist of poles with circumference greater than
37.5 inches (95.25 cm) at 6 feet (1.8 m) from the butt.
(1) For Group B poles 50 feet (15.2 m) and shorter, bore each pole
and re-treat only those found to be nonconforming, unless more than l5
percent fail; in that case, re-treat the entire lot.
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(2) For Group B poles longer than 50 feet (15.2 m), bore each pole
twice at 90 degrees apart around the pole and accept only those poles
conforming to the penetration requirement in both borings. All
nonconforming poles may be re-treated only twice.
(vii) All holes (nominal 0.2 of an inch (0.05 cm) diam. bit) shall
be promptly filled with treated, tight-fitting wood plugs.
(2) Under the Independent Inspection Plan, all treating charges of
crossarms shall be tested for retention and penetration. Plant quality
control inspectors and independent inspectors shall do their analyses
independently. Under the Quality Assurance Plans, the frequency of
testing retention and penetration may vary according to the plan.
(i) The penetration and retention sample shall consist of 20 (48 for
creosote) outer 6/10 of an inch (1.52 cm) for Douglas-fir and 1 inch
(2.54 cm) for Southern Yellow Pine zones from borings taken from any
face except the top face at a location as close to the end as possible
being at least 3 inches (7.62 cm) from the end of the arm and no closer
than 3 inches from the edge of any holes. For laminated material,
borings shall be taken from laminates on a random basis.
(ii) Penetration shall be tested by taking not less than 20 borings
from 20 crossarms in each charge, determined in accordance with AWPA
Standard A3. Chrome Azurol S and Penta-Check shall be used to determine
penetration of copper containing preservatives and penta, respectively.
(3) Laminated material shall be checked for any evidence of
delamination due to treatment and for the identifying quality stamp of
AITC or American Plywood Association (APA).
(4) When x-ray fluorescence (XRF) instruments are used to analyze
preservative or retention, Periodic Instrument Checks (PIC) shall be
made by the treating plant and any outside inspection agency using the
treating plant's instrument or its own. Appendix B of this section
outlines a recommended procedure.
(5) At a minimum, treating plants shall perform the PIC weekly and
record the results in the instrument's log, which shall be stored with
the instrument. Independent inspection agencies shall use their own
samples to perform the PIC on treater's instrument once per visit, not
to exceed one PIC per week. Inspection agencies shall record their
results in the instrument's log and state the date of its latest PIC on
all treating reports.
(6) XRF instruments shall be accurate and reliable, and they shall
generate reproducible results. Instruments shall have thorough
instructions which should include recommendations on drying techniques,
equipment, and density calculations. These drying recommendations shall
be followed when using these instruments.
(h) Product acceptance. Under the Independent Inspection Plan, the
inspector shall signify acceptance by marking each piece of accepted
material with a clear, legible hammer stamp in one end prior to
treatment and in the other end after treatment. The inspector shall
personally mark each piece, and shall not delegate this responsibility
to another person.
(i) Charge inspection reports. (1) Inspection Reports shall cover
the following:
(i) The total pieces in the lot, number of and causes for rejection;
(ii) The conditioning of the material prior to treatment;
(iii) The analyses of preservative identified by the analyst's
signature or certification;
(iv) The details of treatment; and
(v) The results of treatment. These results shall include the
following:
(A) The depth of penetration for retention sample and a summary of
all poles rejected for insufficient penetration;
(B) Worksheets for retention analyses, each identified by quality
control designee and independent inspector;
(C) The number of pieces offered and rejected, together with the
cause(s) for rejection;
(D) The date of latest Periodic Instrument Check.
(2) On each inspection report the independent inspector and the
plant quality control designee shall certify, in writing, that the
material listed on the report has been inspected before,
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during, and after treatment, and that the preservative used was analyzed
in accordance with the requirements of this section.
(3) Each inspector or inspection agency shall retain for a period of
1 year a copy or transcript of each report of inspection, together with
laboratory worksheets covering retention by assay and preservative
analyses for the purchaser, and on request shall furnish a copy or
transcript of any of these reports to the Director, Electric Staff
Division, Rural Utilities Service, Washington, DC 20250-1500.
(j) Charge numbers on re-treat poles. The letter ``R'' shall be
added to the original charge number in the butts of all poles that are
re-treated for insufficient penetration or retention of preservative.
All poles that fail to meet treatment requirements after two re-
treatments shall be permanently rejected.
(k) Safety provisions. Poles intended for RUS borrowers shall not be
inspected when, in the opinion of the inspector, unsafe conditions are
present.
Appendix A to Sec. 1728.202--Recommended Inspectors' Qualifications
(a) Inspection agencies should see that inspectors assigned to the
inspection of timber products and treatment for RUS borrowers are
competent and experienced.
(b) Recommended experience. In general, any of the following
examples are recommended as minimum qualifying experience before a new
inspector may be permitted to inspect timber products for RUS borrowers:
(1) Three years' experience as an inspector of timber and the
preservative treatment of timber.
(2) Three years' experience in timber treating plant quality control
work.
(3) Under the direct supervision of an experienced, well-qualified
inspector, who has performed the following:
(i) Inspected at least 2,500 poles and/or crossarms ``in the
white.''
(ii) Checked preservative penetration results on at least 500 poles
and crossarms.
(iii) Made at least 35 wood assays for preservative retention.
(iv) Made at least 25 analyses of each type preservative used on
material the person is assigned to inspect.
(v) In both (b)(1) and (b)(2) of this appendix A, the experience
should be not less than that required in (b)(3)(i), (b)(3)(ii),
(b)(3)(iii), and (b)(3)(iv).
(4) Inspectors experienced in the inspections of one product, such
as poles, should not be qualified to inspect another product, such as
crossarms, until the above experience is gained.
(5) The inspector should be especially well informed in wood
preservation and the operation of a timber treating plant, and be
competent in preservative analysis and other laboratory work.
(6) In all cases, an inspector should be thoroughly instructed in
the application of RUS specifications and the standards pertaining
thereto before being permitted to independently inspect timber products
and the treatments applied to them. Knowledge of these specifications
and standards, as well as the inspector's proficiency, may be checked
routinely by members of the RUS staff.
Appendix B to Sec. 1728.202--Periodic Instrument Check X-ray
Fluorescence
(a) General. The following sample calibration standards and
procedures may be used in lieu of comparison with analysis by wet ash or
lime ignition methods.
(b) Penta. Until such time as AWPA approves calibration standards
for penta, the following method should be used to run a salt water
solution to measure Cl (chloride).
(1) Standard Solution. Dry approximately 15 grams of reagent grade
NaCl at 105[deg]C for 1 hour. Weigh 10.00 grams into a tared beaker. Add
distilled water until the total weight is 100.00 grams. Stir until
completely dissolved. This will give a 10 percent weight to weight
solution of NaCl.
(2) Baseline Check. (i) Insure that the instrument is in good
agreement with lime ignition.
(ii) Record any user correction factors.
(iii) Stabilize and standardize the instrument.
(iv) Run the salt solution five times using the PENTA-OIL
calibration mode.
(v) Record the average and standard deviation of the values for
percent penta. The average value will now be considered the nominal
value.
(3) Periodic Instrument Check. Run the salt solution two times and
average the results. If the value is more than [plusmn]5 percent of the
nominal value, the instrument needs further calibration, following
manufacturer's recommendation.
(c) Waterborne preservatives. Treaters and inspection agencies
should purchase AWPA Committee P-5 Standard Reference Materials to
analyze on their instruments. Reference materials should be in the
retention range of the material being produced at the plants. If the
value is more than [plusmn]5 percent of the nominal value, the
instrument needs further calibration. AWPA Committee P-5 Standard
Reference Materials may be purchased from:
[[Page 304]]
American Wood Preservers' Association, P.O. Box 286, Woodstock, Maryland
21163, Phone: (410) 456-3169.
[58 FR 41406, Aug. 3, 1993]
| File Type | application/msword |
| File Title | Sec |
| Author | MBrooks |
| Last Modified By | MBrooks |
| File Modified | 2003-02-13 |
| File Created | 2003-02-13 |