HBL-89-040, Semiannual Radioactive Effluent Release Rept,Jan-June 1989

Semiannual Radioactive Effluent Release Rept,Jan-June 1989

ML20246N673
Person / Time
Site:	Humboldt Bay
Issue date:	06/30/1989
From:	Fujimoto W PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
HBL-89-040, HBL-89-40, NUDOCS 8909080216
Download: ML20246N673 (19)

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1. Pacific Gas and Electric Company 77 Beale Street - Warren Fujimoto I San Francisco,CA 94106 Manager 4151972 4758 . Nuclear Operations Support 1

August 29, 1989' l PG&E Letter No. HBL-89-040 U.S. Nuclear Regulatory Commission

. ATTN: Document Control Desk-Hashington, D.C. 20555 Re:. Docket No. 50-133, OL-DPR-7 Humboldt Bay Power' Plant Unit 3 Semiannual Radioactive Effluent Release Report Gentlemen:.

Enclosed is the'Humboldt Bay Power Plant Unit 3 " Report on Radioactive Effluent Releases and Haste Disposal" covering the -

period from January 1, 1989, through June 30, 1989. This report is required.by Section VII.H.3 of the Humboldt Bay Unit 3 Technical Specifications and 10 CFR 50.36a(a)(2).

Kindly; acknowledge receipt of this material'on the enclosed copy of this letter and' return it in the enclosed addressed envelope.

Sincerely, s

'a-cc: P. Anderson E. Bailey D. E. Martin J. B. Martin D. J. Homeldorf Humboldt Distribution Humboldt Service List Enclosure 2827S/0071K/RLK/1052

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PG&E Letter No.:HBL-89-040 ENCLOSURE.

l HUMBOLDT BAY POWER PLANT:

l. UNIT 3 l

l' SENIANNUAL RADI0 ACTIVE EFFLUENT RELEASE.' REPORT January 1, 1989 through June 30, 1989 l

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PACIFIC GAS AND ELECTRIC COMPANY DOCKET NO. 50-133 LICENSE NO. DPR-7 RADI0 ACTIVE EFFLUENT RELEASES AND NASTE DISPOSAL FROM L

HUMBOLDT BAY POWER PLANT UNIT 3, COVERING THE PERIOD JANUARY 1, 1989 THROUGH JUNE 30, 1989

.This report summarizes.the quantity of each of the principal radionuclides released in liquid and gaseous effluents to unrestricted areas and summarizes radioactive waste disposal from January 1, 1989 through June 30, 1989. This.

report is required by Section VII.H.3 of the Humboldt Bay Power Plant Unit 3 Technical Specifications.

A. SUPPLEMENTAL INFORMATION

1. Regulatory Limits

a. Fission and activation gases: The regulatory release rate limit is based on the appropriate Maximum Permissible Concentrations from 10 CFR 20, divided by a dispersion factor of 1.4E-6 seconds per cubic meter (determined to be the annual average dispersion factor for the sector with the least atmospheric dispersion),

b. Iodines: Due to the long decay time since the Unit was last operated (July 2, 1976), no detectable releases of radioactive iodines are expected. Therefore, the license does not define a corresponding release rate limit.

c. Particulate: The regulatory release rate limit is based on the appropriate Maximum Permissible Concentrations from 10 CFR 20 divided by a dispersion factor of 1.4E-6 seconds per cubic meter (determined to be the annual average dispersion factor for the sector with the least atmospheric dispersion).

d. Liquid effluents: 10 CFR 20.

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2. Maximum Permissible Concentrations l The concentrations used to determine allowable release rates or allowable concentrations are as follows:

a. Gaseous effluents:

(1) Fission and activation gases: 10 CFR 20, Appendix B,

, Table II.

I (2) Iodines: Not applicable.

(3) Particulate, with half-lives >8 days): 10 CFR 20, Appendix B. Table II.

b. Liquid effluents: 10 CFR 20, Appendix B, Table II.

3. Average energy.

Not applicable.

4. Measurements and Approximations of Total Radioactivity The methods used to measure or approximate the total radioactivity in effluents and to determine radionuclides composition are as follows:

a. Fission and activation gases: The gaseous activity released from the plant vent is monitored by an off-line monitor equipped with a beta scintillator. Due to the long decay time since  ;

operation (shutdown July 2, 1976), no detectable releases of short half-life fission and activation gases can be expected.

Accordingly, these radionuclides are not reported. The "less than" value for Kr-85 is based on the estimated sensitivity of the stack Kr-85 monitor.

b. Iodines: Due to the long decay time since operation (shutdown July 2, 1976), no detectable releases of radioactive iodines of plant origin can be expected. Since the license does not require that these radionuclides be monitored, these radionuclides are not reported.

c. Particulate: Radioactive materials in particulate form released from the plant vent are monitored by continuous sample collection on particulate filters. Filter papers are removed from the stack sampling system weekly and, after 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> decay, are analyzed for gross alpha (internal proportional counter) and for the concentration of gamma-emitting nuclides (intrinsic germanium detector). All statistically significant peaks are identified. The filters for each quarter are analyzed for radioactive strontium (all Sr-90 due to decay time).

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l The error of the reported particulate release values is estimated based on uncertainty in sample flow rate, stack flow rate, detector calibration, and typical sample counting statistics.

d. Liquid effluents: Liquid waste batch samples were counted for gamma spectrum and gross beta radioactivity. All statistically important peaks were identified. Quarterly composites of all batches were analyzed for gross alpha, trit.ium, and radioactive strontium (Sr-90).

The error of the reported release values is estimated based on uncertainty in simple volume, batch volume, detector calibration, and typical sample counting statistics.

5. Batch releases

a. Liquid (1) Number of batch releases: 10 (2) Total time period for batch releases: 2.70E3 minutes (3) Average time period for a batch release: 2.70E2 minutes (4) Maximum time period for a batch release: 5.65E2 minutes (5) Minimum time period for a batch release: 5.50E2 minutes (6) Average stream flow during periods of release of effluents into a flowing stream: Not applicable (discharge is into Humboldt Bay)

b. Gaseous: None

6. Abnormal releases

a. Liquid (1) Number of releases: None (2) Total activity released: None

b. Gaseous (1) Number of releases: None (2) Total activity released: None 4

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l 28275/0071K _____________________-__-______D

l-I r B. GASEOUS EFFLUENTS

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All ventilation exhausts and system vents-are routed to the exhaust stack. Table B1 summarizes the total quantities of gaseous radioactive effluents released by quarter. Table 82 summarizes the total quantities for each of the nuclides determined to be released.

C. LIQUID EFFLUENTS l

All normal liquid releases were collected, filtered, and analyzed before discharge (on a. batch basis) through the liquid radwaste process I monitor. Analysis of weekly composite samples from the plant intake and the plant ' effluent canal did not detect any additional release of radioactive liquids during the report period.

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, Table Ci summarizes the total quantities of radioactive liquid effluents released by quarter. Taole C2 summarizes the total quantity for each of the nuclides determined to be released.

D. SOLID HASTE No radioactive solid waste was shipped for disposal during the report period.

E. RADIOLOGICAL IMPACT ON MAN A comparison of calculated doses from various paths has shown that the off-site doses are primarily due to direct radiation and to the consumption of aquatic foods. Maximum doses to individuals are summarized in Table El. These doses comply with 40 CFR 190 since there are no other fuel cycle facilities within 8 km.

1. Doses to the average individual in the population from all receiving-water-related pathways were calculated for the releases detected, based on the guidance of Regulatory Guide 1.109. The results were 0.003 mrem /yr (total body) for the Adult age group, and 0.004 mrem /yr for the bone of the Child age group.

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2. Total body doses to the average individual in the population from gaseous effluents to a distance of 50 miles from the site are not significant. For comparison, a conservative calculation (with the same dispersion and deposition parameters as were used to calculate maximum exposure) resulted in total body exposures of less than 0.005 arem/yr.

3. Total body doses (to the average individual in unrestricted areas -

from direct radiation from the facility) are based on TLD results of stations at the site boundary, using the shoreline occupancy factors {

given in Regulatory Guide 1.109 for the highest average potential '

individual (Teen age group). For this group, direct radiation would result in an exposure of 0.011 arem/yr.

F. METEOROLOGICAL DATA The meteorological data logging system was removed from service in 1967.

Therefore, the information specified by Regulatory Guide 1.21. Appendix B, Section F, is not available.

Table F1 summarizes the cumulative joint frequency distribution of wind speed, direction. and atmospheric stability for the period April 1962 through June 1967, when the meteorological data logging system was in service, i

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EFFLUENT AND HASTE DISPOSAL SEMIANNUAL REPORT - 1989 1

GASEOUS EFFLUENTS - SUMMATION OF ALL RELEASES

, UNIT FIRST SECOND EST. TOTAL DUARTER OUARTER ERROR. 1 A. FISSION GASES

1. Total Release Ci <1.61El <1.59El 5.00E1

2. Average Release micro-Ci Rate for Period per sec. <2.05E0 <2.05E0

3. Percent of applicable limit 1 (9.58E-4 <9.58E-4 B. 10 DINES-

1. Total Release ** ** **

Ci

2. Average Release micro-Ci Rate for Period per sec. ** **

3. Percent of applicable limit  % ** **

C. PARTICULARIS

1. Total w th Half-lives >B Days C1 1.91E-5 5.91E-6 3.00E1

2. Average Release- micro-Ci Rate for Period per sec. 2.43E-6 7.60E-7

3. Percent of applicable limit 1 1.02E-6 3.61E-7

3. Applicable limit micro-Ci (Mixture MPC) per cc 3.33E-10 2.94E-10

4. Gross Alpha Radioactivity C1 3.91E-7 4.95E-7 D. TRITIUM

1. Total Release Ci <9.91E-3 (9.80E-3 5.00E1

2. Average Release micro-Ci Rate for Period per sec. <1.26E-3 <1.26E-3 Note: **No release can be expected due to decay time since shutdown (July 2, 1976). Accordingly, no release is reported.

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O TABLE B2 EFFLUENT AND WASTE DISPOSAL SEMIANNUAL REPORT - 1989 GASEOUS EFFLUENTS - ELEVATED RELEASES - CONTINUQUS MODE NUCLIDES RELEASED UNIT FIRST SECOND OUARTER OUARTER A. FISSION GASES Krypton-85 C1 <1.61El (1.59El Unidentified Ci ** **

Total for period Ci <1.61El <1.59El B. 10 DINES Unidentified Ci Total for period- Ci ** **

C. PARTICULATE Strontium-89 Ci Strontium-90 Ci <1.31E-7 <1.09E-7 Cesium-134 Ci (3.87E-6 (4.28E-6 Cesium-137 Ci 7.39E-6 1.84E-6 Cobalt-60 Ci 1.17E-5 4.07E-6 Unidentified Ci <3.8/E-6 (4.28E-6 Total for period C1 1.91E-5 5.91E-6 Note: **No release can be expected due to decay time since shutdown (July 2, 1976). Accordingly, no release is reported.

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4 TABLE C1

. EFFLUENT AND WASTE DISPOSAL SEMIANNUAL REPORT - 1989 LIQUID-EFFLUENTS - SUMMATION OF ALL RELEASES UNIT FIRST SECOND EST. TOTAL QUARTER OUARTER ERF.GR. 1 A. FISSION AND ACTIVATION PRODUCTS

1. Total release (not l- including tritium, gases, or alpha) C1 1.94E-3 2.59E-3 1.50E1

2. Average diluted concentration micro-Ci during period per al 9.60E-11 1.89E-10

3. Percent of applicable limit  % 1.20E-3 2.92E-3

4. Applicable limit micro-Ci (Mixture NPC) per ml 7.99E-6 6.46E-6 B. TRITIUM

1. Total Relecse C1 2.73E-4 1.42E-4 1.50E1

2. Average diluted concentration micro-Ci during period per ml 1.35E-11 1.04E-11

3. Percent of ,

applicable limit 1 4.50E-7 3.45E-7 C. DISSOLVED AND ENTRAINED GASES

1. Total Release C1 D. GROSS ALPHA RADI0 ACTIVITY

1. Total Release Ci (2.68E-5 <1.63E-5 2.00E1 E. Volume of waste released (prior to dilution) liters 1.30E5 9.69E4 1.00E1 F. Volume of dilution water used during period liters 2.02E10 1.37E10 1.50E1 Note: **No release can be expected due to decay time since shutdown (July 2, 1976). Accordingly, no release is reported.

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L TABLE C2 EFFLUENT AND MASTE DISPOSAL SEMIANNUAL REPORT - 1989 I LIQUID EFFLUENTS - BATCH MODE 1

NUCLIDES RELEASED UNIT FIRST SECOND OUARTER 00ARTER Strontium-89 ** **

Ci Strontium-90 C1 4.59E-5 8.76E-5 Cesium-134 Ci 1.02E 1.13E-5 Cesium-137 C1 1.73E-3 2.02E-3 Cobalt-60 C1 1.52E-4 4.71E-4 Unidentified Ci <4.22E-6 <2.66E-6 Total for period Ci 1.94E-3 2.59E-3 l

Xenon-133 Ci Xenon-135 Ci Note: **No release can be expected due to decay time since shutdown (July 2, 1976). Accordingly, no release is reported, i 2827S/0071K - _ _ _ _ _ _ - - - _ _ _ _ _ _ _ _

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TABLE D1 EFFLUENT AND NASTE DISPOSAL SEMIANNUAL REPORT FIRST HALF OF 1989 SOLID NASTE AND IRRADIATED FUEL SHIPMENTS A. SOLID NASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not irradiated' fuel)

1. TYPE OF NASTE UNIT 6-MONTH EST. TOTAL ~

PERIOD ERROR 1 i

a. Spent resins, filter Cubic 1

. sludges, evaporator Meter None --

bottoms, etc. C1 None --

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~b. Dry compressible Cubic waste, contaminated Meter None --

equipment, etc. C1 None --

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c. Irradiated components Cubic ,

control rods, etc. Meter None --

1 Ci None --

d. Other (absorbed Cubic l liquids) Meter None --

Ci None --

2. Estimate of major nuclide composition (by type of waste).

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3. Solid Maste Disposition:

NUMBER OF SHIPMENTS MODE OF TRANSPORTATION DESTINATION l

None - --

8. IRRADIATED FUEL SHIPMENTS (Disposition)'

NUMBER OF SHIPMENTS MODE OF TRANSPORTATIQ!i DESTINATION 1

None -- --

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. ' , :s TABLE El EFFLUENT AND WASTE DISPOSAL SEMIANNUAL REPORT FIRST HALF OF 1989 MAXIMUM OFF-SITE DOSES AND DOSE COWITNENTS TO MEMBERS OF.THE PUBLIC ANNUAL DOSE, MILLIREM (9)

Third Fourth First. Second Four.

Quarter Quarter Quarter Quarter Quarter Source 1988 1988 1989 1989 Averaae

<0.01(6) 0.02(6) <0.01(6) 0.01(6) 0.01 Liould Effluents (1) <0.01(7) 0.03(5) <0.01(7) 0.02(7) 0.02 Airborne Effluents

<0.01(8) <0.01(8) <0.01(8) <0.01(8) <0.01-Iodines'& Particulate (2) 0.02(7) <0.01(7) <0.01(7) <0.01(7) 0.01 Hable Gases (3) -- -- -- -- --

Direct Radiation (4) 0.18 0.02 <0.01 0.02 0.06 Notes: 1. Maximum total body and organ doses to ind'viduals in unrestricted areas from receiving-water-related exposure pathways have been calculated for detected liquid releases based on the average concentrations for the report period, folicwing the applicable portions of Regulatory Guide 1.109.

2. Maximum total body and organ doses to individuals in unrestricted areas from airborne-particulate-related exposure pathways have been calculated for detected airborne particulate releases based on the average concentrations for the ' report period, following the applicable portions of Regulatory Guide 1.109.

3. Total. body and skin doses to potentially exposed individuals located at the point of maximum offsite ground-level concen-trations of radioactive gaseous effluents were not ca!culated because there were no detected releases of radioactive noble gases, and because the doses would be less than 0.005 mrem /yr at the level at which the releases could be detected.

4. Total body doses (to the maximum individual in the population) are based on TLD results of stations at the site boundary, using the shoreline occupancy factors given in Regulatory Guide 1.109 for the maximum potential individual (Teen age group).

S. Liver (Teen age group).

6. Total body (Adult' age group).

7. Bone (Child age group).

8. Total body (Child age group).

9. The dose shown for each quarter is calculated on an annual basis for four 1dentical quarters.

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, TABLE F1 L PERCENT OF TIME FOR EACH HIND SPEED AND DIRECTION

. FOR THE PERIOD APRIL 1962 THROUGH JUNE 1967 RECORDED AT THE 250 FOOT ELEVATION 1

l STABILITY CLASS: Pe.;0UILL 'C' WIND WIND SPEED (MPH)

DIRECTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

.(DEGREES) 0-3 4-7 8-12 13-18 19-24 >24 Total '

0 'O.02 0.06 0.05 0.03 0.02 0.01 0.20 10 0.02 0.03 0.04 0.03 0.01 0.00 0.13 20 0.03 0.03 0.01 0.01 0.00 0.00 0.08 30 0.02 0.02 0.00 0.00 0.00 0.00 0.04 40 0.00 0.01 0.00 0.01 0.00 0.00 0.02 50 0,01 0.01 0.00 0.00 0.00 0.00 0.02

, 60 0.01 0.01 0.00 0.00 0.00 0.00 0.03 70 0.00. 0.00 0.00 0.00 0.00 0.00 0.00 80 0.01 0.00 0.00 0.00 0.00 0.00 0.01 90 0.00 0.00 0.00 0.00 0.00 0.00 0.01 100 0.00 0.00 0.00 0.00 0.00 0.00 0.00 110 0.00 0.00 0.00 0.00 0.00 0.00 0.01

'120 0.01 0.01 0.01 0.00 0.00 0.00 0.03 130 0.01 0.01 0.00 0.01 0.00 0vi 0.03 140 0.00 0.01 0.01 0.00 0.01 0.00 0.02 150 0.00 0.01 0.01 0.02 0.01 0.00 0.06 160 0.00 0.01 0.01 0.01 0.01 0.00 0.04 170 0.00 0.00 0.02 0.02 0.01 0.01 0.07 180 0.00 0.01 0.02 0.02 0.00 0.00 0.05 190 0.01 0.01 0.01 0.01 0.01 0.00 0.04 200 0.00 0.02 0.02 0.02 0.00 0.01 0.09 210 0.02 0.03 0.06 0.02 0.01 0.00 0.13 220 0.01 0.02 0.08 0.04 0.03 0.02 0.19 230 0.01 0.06 0.12 0.14 0.05 0.02 0.39 240 0.01 0.09 0.22 0.15 0.02 0.03 0.51 250 0.02 0.18 0.26 0.10 0.02 0.00 0.58 260 0.02 0.13 0.24 0.04 0.01 0.00 0.44 270 0.02 0.16 0.22 0.02 0.01 0.00 0.42 280 0.02 0.13 0.11 0.01 0.00 0.00 0.27 290 0.02 0.10 0.10 0.01 0.01 0.00 0.24 300 0.01 0.09 0.06 0.00 0.00 0.00 0.15 310 0.01 0.04 0.06 0.01 0.00 0.00 0.12 320 0.01 0.03 0.05 0.01 0.01 0.01 0.12 330 0.01 0.03 0.03 0.01 0.02 0.01 0.11 340 0.01 0.04 0.04 0.03 0.02 0.01 0.15 350 0.01 0.02 0.06 0.07 0.05 0.01 0.22 Rows may not sum to exact total due to rounding off.

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. l TABLE F1 (Cont.)

PERCENT OF TIME FOR EACH HIND SPEED AND DIRECTION FOR THE PERIOD APRIL 1962 THROUGH JUNE 1967 RECORDED AT THE 250 FOOT ELEVATION STABILITY CLASS: PASQUILL 'D' WIND WIND SPEED (MPH)

DIRECTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

(DEGREES) 0-3 4-7 8-12 13-18 19-24 >24 Total 0 0.11 0.34 0.78 0.85 0.49 0.48 3.05 10 0.04 0.27 0.52 0.46 0.38 0.27 1.95 20 0.05 0.21 0.32 0.19 0.16 0.11 1.04 30 0.06 0.20 0.16 0.08 0.03 0.04 0.58 40 0.05 0.11 0.05 0.02 0.00 0.01 0.23 50 0.03 0.05 0.08 0.00 0.01 0.00 0.16 60 0.04 0.08 0.04 0.00 0.00 0.00 0.15 '

70 0.04 0.02 0.01 0.01 0.00 0.00 0.08 80 0.02 0.04 0.00 0.01 0.00 0.00 0.07 90 0.01 0.04 0.03 0.00 0.00 0.00 0.09 100 0.02 0.01 0.02 0.00 0.00 0.00 0.05 110 0.00 0.03 0.01 0.01 0.00 0.00 0.06 120 0.02 0.03 0.03 0.02 0.01 0.00 0.11 130 0.01 0.03 0.02 0.02 0.01 0.00 0.10 140 0.02 0.03 0.02 0.04 0.01 0.01 0.13 150 0.03 0.03 0.03 0.09 0.03 0.02 0.23 160 0.01 0.04 0.05 0.10 0.04 0.01 0.26 170 0.02 0.05 0.12 0.16 0.04 0.01 0.40 180 0.04 0.08 0.12 0.13 0.03 Oz01 0.40

.190 0.02 0.07 0.09 0.06 0.03 0.02 0.28 200 0.05 0.10 0.17 0.11 0.02 0.01 0.46 210 0.05 0.12 0.20 0.08 0.04 0.01 0.51 220 0.05 0.14 0.14 0.12 0.05 0.02 0.51 230 0.03 0.14 0.17 0.11 0.06 0.02 0.53 240 0.08 0.22 0.21 0.06 0.03 0.01 0.61 250 0.08 0.17 0.13 0.04 0.01 0.00 0.43 260 0.08 0.22 0.13 0.02 0.01 0.00 0.47 270 0.12 0.21 0.11 0.03 0.01 0.00 0.49 280 0.05 0.20 0.11 0.04 0.00 0.00 0.40 290 0.04 0.22 0.11 0.02 0.00 0.00 0.39 300 0.10 0.21 0.21 0.02 0.01 0.00 0.53 310 0.08 0.28 0.19 0.03 0.02 0.01 0.60 320 0.07 0.25 0.33 0.09 0.04 0.01 0.80 330 0.06 0.21 0.35 0.16 0.09 0.03 0.90 340 0.07 0.24 0.50 0.47 0.17 0.08 1.53 1 350 0.07 0.30 0.82 0.86 0.49 0.33 2.87 Rows may not sum to exact total due to rounding off.

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,9 TABLE F1 (Cont.)

PERCENT OF TIME FOR EACH WIND SPEED AND DIRECTION FOR THE PERIOD APRIL 1962 THROUGH JUNE 1967 RECORDED AT THE 250 FOOT ELEVATION STABILITY CLASS: PASQUILL 'E' HIND WIND SPEED (MPH)

DIRECTION ----------------------------- --------------------

(DEGREES) 0-3 4-7 8-12 13-18 19-24 >24 Total 0 1.04 1.06 2.00 1.84 0.82 0.10 6.86 10 0.17 0.80 1.55 0.90 0.36 0.10 3.78 20 0.30 0.83 1.26 0.47 0.13 0.00 2.99 30 0.37 0.73 0.64 0.19 0.01 0.00 1.94 40 0.21 0.60 0.47 0.02 0.00 0.00 1.31 50 0.18 0.56 0.28 0.02 0.00 0.00 1.05 60 0.21 0.54 0.19 0.00 0.00 0.00 0.93 70 0.19 0.44 0.07 0.00 0.00 0.00 0.81 80 0.20 0.41 0.07 0.00 0.00 0.00 0.68 90 0.27 0.47 0.17 0.01 0.00 0.00 0.82 100 0.17 0.24 0.06 0.01 0.00 0.00 0.49 110 0.20 0.31 0.10 0.00 0.00 0.00 0.60 120 0.18' O.31 0.19 0.01 0.02 0.00 0.70 130 0.14 0.25 0.08 0.08 0.03 0.03 0.72 140 0.09 0.22 0.21 0.23 0.22 0.25 1.21 150 0.09 0.24 0.22 0.45 0.52 0.46 2.08 160 0.05 0.22 0.25 0.62 0.44 0.21 1.79 170 0.04 0.26 0.43 0.73 0.23 0.09 1.89 180 0.26 0.32 0.45 0.43 0.20 0.02 1.77 190 0.15 0.26 0.37 0.35 0.15 0.02 1.20 200 0.22 0.48 0.47 0.26 0.18 0.06 1.77 210 0.20 0.44 0.58 0.18 0.05 0.04 0.60 220 0.20 0.40 0.55 0.15 0.14 0.03 1.37 230 0.23 0.43 0.40 0.14 0.13 0.05 1.39 240 0.24 0.39 0.23 0.15 0.13 0.01 1.24 250 0.21 0.32 0.16 0.03 0.01 0.01 0.84 l: 260 0.24 0.31 0.17 0.03 0.00 0.00 0.85 270 0.35 0.35 0.13 0.12 0.01 0.00 0.97 t 280 0.19 0.30 0.15 0.01 0.01 0.01 0.67 290 0.19 0.33 0.17 0.01 0.01 0.01 0.81 300 0.21 0.37 0.16 0.01 0.00 0.01 0.88 310 0.20 0.47 0.29 0.02 0.00 0.00 0.98 320 0.20 0.59 0.65 0.12 0.01 0.05 1.72 330 0.22 0.87 0.98 0.35 0.02 0.02 2.45 340 0.20 0.88 1.55 0.74 0.01 0.00 3.48 350 0.19 1.02 2.02 1,41 0.55 0.13 5.22 Rows may not sum to exact total due to rounding off.

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TABLE F1 (Cont.)

PERCENT OF TIME FOR EACH HIND SPEED AND DIRECTION FOR THE PERIOD APRIL 1962 THROUGH JUNE 1967 RECORDED AT THE 250 FOOT ELEVATION

'F' STABILITY CLASS: PASQUILL i WIND WIND SPEED (MPH)

DIRECTION ------- --------- ------ ----

(DEGREES) 0-3 4-7 8-12 13-18 19-24 >24 Total 0 0.42 0.08 0.03 0.00 0.00 0.00 0.53 10 0.05 0.06 0.05 0.01 0.00 0.00 0.18 l 20 0.05 0.09 0.08 0.03 0.00 0.00 0.24 30 0.12 0.11 0.10 0.04 0.00 0.00 0.37 40 0.07 0.13 0.10 0.03 0.01 0.00 0.34 50 0.09 0.13 0.06 0.00 0.00 0.00 0.27 60 0.14 0.19 0.07 0.01 0.00 0.00 0.40 70 0.11 0.22 0.08 0.00 0.00 0.00 0.40 80 0.10 0.22 0.07 0.00 0.00 0.00 0.40 90 0.14 0.25 0.07 0.00 0.00 0.00 0.46 100 0.11 0.29 0.09 0.01 0.01 0.00 0.51 110 0.13 0.31 0.13 0.02 0.00 0.00 0.59 120 0.15 0.33 0.18 0.03 0.00 0.00 0.69 130 0.10 0.23 0.14 0.02 0.00 0.00 0.50 140 0.10 0.22 0.11 0.09 0.02 0.00 0.54 150 0.12 0.19 0.10 0.07 0.03 0.02 0.52 .

160 0.08 0.15 0.16 0.08 0.01 0.00 0.47 I 170 0.07 0.15 0.14 0.07 0.00 0.00 0.43 l 180 0.16 0.26 0.13 0.02 0.00 0.00 0.56 190 0.12 0.18 0.13 0.02 0.00 0.01 0.46 1 200 0.13 0.25 0.18 0.02 0.00 0.00 0.58 210 0.18 0.32 0.20 0.02 0.00 0.01 -0.73 220 0.14 0.28 0.09 0.02 0.00 0.00 0.54 230 0.18 0.24 0.07 0.01 0.01 0.00 0.50 240 0.19 0.19 0.05 0.02 0.00 0.00 0.45 250 0.15 0.16 0.01 0.00 0.00 0.00 0.32 260 0.17 0.10 0.01 0.00 0.00 0.00 0.29 270 0.18 0.09 0.01 0.00 0.00 0.00 0.28  !

280 0.10 0.04 0.01 0.00 0.00 0.00 0.15 l 290 0.11 0.05 0.01 0.00 0.00 0.00 0.16 ]

300 0.13 0.07 0.00 0.00 0.00 0.00 1.19 310 0.07 0.05 0.01 0.00 0.00 0.00 0.13 320 0.09 0.05 0.03 0.00 0.00 0.00 0.17 330 0.09 0.09 0.01 0.00 0.00 0.00 0.19 340 0.06 0.10 0.03 0.01 0.00 0.00 0.20 350 0.07 0.09 0.05 0.01 0.00 0.00 0.21 I

Rows may not sum to exact total due to rounding off.

i 1

28275/0071K l 1