## May I, 1995

TO: Christy Lee EPARegion X FAX (206) 553-0110

FROM:
Steve Morris Anchorage AirPollution Control Agency (907) 343-6976

SUBJECT: PM-IO DataCapture

DearChristy:

You askedme to documentwhy we failed to achieve 75%data capture atourEagle River PM-IO sites duringthe first quarterof 1994. Wehavetwo monitoring stations in Eagle River. TheParkgate station (020060 004I030) is settorun on a one in six day schedule andthe Caribou station (020060 040GOI0) is setto run every day. Thedatacapture rate duringthefirst quarter of 1994 was 67%(10 of 15 sampling days) at Parkgate and 61% atCaribou (55 of90 sampling days).
The reason for these low datacapture rates was an acute staffshortage during most ofMarch 1994. Wendell Lane, who operatedthe PM-IO network for years, retiredatthe endofFebruary. Wehad planned tocontinue PM-IO network operations with other staffmembers. LarryTaylorhurthis knee in a workrelated injury inearly March. This injury required surgery and he missed over a week ofwork. He was unabletoperform any field work for several weeks afterward as he recovered from surgery.
Wereceived overa foot ofsnowon March 2. Itcontinuedto snow on March 3 and 4. There was ample
snow coverthrough all ofMarchand wejudgedthatthe potential for PM-IO pollution was low. Given our staffing shortage, we optedto suspendPM-I0monitoring temporarily. Monitoringwas suspended in Eagle River from March 4 through April 

## I. The PM-I0 network was down for a shorterperiod oftimein Anchorage.


## Itis extremely unlikelythatPM-I0 levels exceeded the NAAQS during tlus down period. Snow cover was ample. In 

## ourexperience, PM-I0 levels remain lowwhen snow coveris present.
Weresumedmonitomg atourGambell station 

## in midtownAnchorage earlierthanthe Eagle River stations (on March 23). Thehighest PM-IO concentration measured atGambell duringthe period March 23

- April I was 27 J-Lg/m

## 3 PM-IO concentrations 

## in Eagle River arewell correlatedtc 

## measurements in Anchorage. However, the magnitude ofthe concentrations measured atGambell are consistentlyhigherthan those in Eagle River. This suggests that PM-IO levels in Eagle Riverwere quite low during this period.

Ifyou have further questions please give me a call at 343-6976.

cc: Gerry Guay

# ('

( \,. MAR 1994 ANCHORAGE, AI< WEATHER SERVICE CONTRACT METEOROLOGICAL OBSERVATORY 

# LOCAL

INQUIRIES/COMMENTS CALL 

# CLIMAmOLOGICAL (704) 271-4800 VOICE**~** 271-4010 TDO/271-4876 FAX
PT. CAMPBELL OBS. INT. AP. 

# MONTHLY SUMMARY ISSN # 0197-9558


# DATA

LATITUDE 61° 13'N LONGITUDE 149" 53'W ELEVATION (GROUND) 114 FEET TIME ZONE ALASKA 26451 TEMPERATURE 'F DEGaEJ!: DAYS WEATHER TYPES SNOWI PRECIPITATION AVERAGE 

### WIND 

# "'"' SUNSHINE OOV'" SASE 65 'po**.~** ICE (INCHi$) STATION (M.P.H. \ 

### mm" 

# rd lHDlVY fOG ON

# ~**~ ~**  PRESSURI!:

### ~ PEAl< FASTEST

### ~ J THUlfDERSTllIIM5 GRD

### ~ {INCHES

# ~~ GUST I-MIN Eo 

## § 4 ICE PELLETS**~** 

# '" '"**~** 1'0 

# I: Ii Ii 5 HAIL AT**~** 

## :l OF Hq) 

# " 

# u**~**

## E~ 

# ·"" Sl Sl 

# i ' ta .....

### 'E

# ~**~ ~**  

# " •• z. 

## :l! Z H H 0300 o**~** ELEV. C C**~** 

# .. o.

# ~ H 

## iil

# ~ .., , DU5'!'STOIIH Z**~** 

## "**~** 

### gj 

### if**U~** 

# -, ""

# ~**~a** 

## 8 a**5MO~I!..KA.E ~** **~** 132

# ~**~~ ~**  

# ..**~~** 

### !" P H 

## !lC; g BLOwnlC SNOW 

## g**~~ ~**  H**~** H 

## !i1**,~ ;;~**  z

.. 0 

# .. U (IK. ) U (!'T.MSL) 

# .. • 0**~** C**~g** H 1 2 3 4 

### S 

# • 7A 7• 

### B 

# • 10 11 12 13 14 

### IS 

# " 17 

### IB I. 20 21 22 

# " 01 27 20 24 2 22 41 0 1 2 0.23 

### B.l 28.760 06 2.3 5.B 15 SW B 03 0 

## o 10 10 02 25 13 

### I. -3 17 46 0 2 12 0.33 6.B 28.810 26 6.7 B.4 20 SW 15 23 0 

## o 10 10 03 19 12 16 -6 

# • 4. 0 1 15 0.10 3.0 29.120 26 4.1 7.0 13 SW 10 32 0 0 

# • 10 04 12 3 B -14 -1 57 0 1 

# • 16 0.06 

### D •• 29.400 20 10.8 1.3 2B S 1B 20 0 

## o 10 10 05 11 

## -

# .. ,. -22 -3 64 0 16 0.00 0.0 30.170 03 6.B B.3 20 N 15 01 13. 21 2 3
06 20 2 11 -12 2 54 0 16 0.00 0.0 29.960 36 11.2**~!-.4** 22 N 15 01 31 5 10 10 07 35 20 2B 5 23 37 0 14 T T 29.630 35 6.5 7.3 13 N 13 36 0 

## o 10 10 OB 40 30 35 12 2B 30 0 12 T T 29.320 31 5.B 7.5 17 W 14 30 0 

## o 10 10 O' 43 32 3B 14 2. 27 0 10 0.00 0.0 29.300 15 3.3 8.4 23 SE 14 07 40 6 10 

# • 10 3. 25 32 B 27 33 0 

# • 0.00 0.0 29.480 O. 0.' 6.3 16 SE 12 

### I. 0 0 B B
11 3. 23 31 7 24 34 0 B 0.00 0.0 29.470 02 5.' B.5 24 N 1B 03 21 3 

# • B 12 41 2B 35 11 2l 30 0 B 0.00 0.0 29.190 35 2.2 7.2 16 N 13 02 

# ., 13 

# • • 13 40 25 33 B 26 32 0 B 0.00 0.0 29.450 33 2.1 6.7 15 NE 13 22 23 3 

# • B 14 41 30 36 11 2. 2. 0 1 7 0.06 1.6 29.520 35 3.2 5•• 13 NE B 30 0 0 

# • • 15 31 21 26 1 23 3. 0 1 13 0.32 5.2 29.320 2. 3.1 6.2 15 HE 10 27 0 

## o 10 10
16 23 

### I. 21 -5 16 44 0 1 15 0.19 2.5 29.290 36 ..5 0.0 26 N 15 34 0 

## o 10 10 17 27 14 21 -5 3 44 0 15 0.00 0.0 29.500 35 10.2 O.B 26 NW 20 33 0 0 7 6 1B 27 5 16 -10 -2 4. 0 12 0.00 0.0 29.500 36 B.3 

# ••• 2l N 16 33 73 10 0 1 

# " 1B 6 12 -14 -5 53 0 12 0.00 0.0 29.370 34 13.2 3.5 2B NW IB 34 0 0 7 6 20 

### I. 3 11 -.16 -6 54 0 12 0.00 0.0 29.620 36 13.4 3.7 26 N 21 01 10. 15 1 1
21 21 2 12 -15 -B 53 0 

# • 0.00 0.0 29.830 36 7.B B.4 21 N 16 01 123 17 2 3 22 23 B 16 -11 3 4. 0 

# • T T 29.710 01 B.6 '.0 17 N 13 01 0 0 10 10 23 37 20 2. 1 22 36 0 

# • T T 29.510 34 4.7 B.B 2B SE 17 2. 0 0 10 10 24 42 31 37 

# • 2. 28 0 

### B 0.14 T 29.330 16 6.4 0.5 25 SW 20 14 0 

## o 10 

# • 25 45 34 40 12 27 25 0 6 0.00 0.0 29.630 15 7.4 1.2 2. S 17 14 67 

# •• •
26 41 25 33 4 27 32 0 1 4 0.09 1.B 29.530 24 4.' 0.5 31 SE 1B 15 0 

## o 10 10 27 3B 23 31 2 22 34 0 6 T T 30.000 O' 4.0 B.B 32 SE lB 16 0 

## o 10 10 2B 44 24 34 5 26 31 0 4 0.00 0.0 29.820 31 5.' 7.0 14 SE 12 13 3B3 4. 

# • • 2' 40 32 36 6 28 2. 0 4 T T 29.635 33 4.B 6.5 14 NW 10 32 0 

## o 10 10 30 45 34 40 10 32 25 0 3 T 0.0 29.800 13 1.6 6.5 2B SE 16 17 0 

## o 10 B 31 4B 33 41· 11 31 24 0 3 0.00 0.0 29.940 35 0.7 5.7 13 H 

# • 17 lB6 23 10 

# • S SUN T TO OTAr FOR THE 0 B 

# , 

# •

# ..."'"
VG. 0
.

# A~ NUMBER OF DAYS 

### B

# -;**~** AVG. DEP. PRECIPITATION

### ~**D~** , 7 , 0 POIiI 32.3 19.0 25.11 0.0116.5 -6 o:z. .01 INCH 9 0.82 20130 6 

# •• B. NUMBER OF DAYS EAIOI'I TO DAT SNOW, ICE PELLETS GREA'l'EST IN 24 BOURS AND DMES GREATEST OBP'l'B ON GROUND 

### or ALiToTAL :z. 1.0 INCH 1 SNOW, ICE PELLETS OR ICE MAXIMUM TEMP.I MINIMUM TEMP. 1936 

### oTHUNDERSTORMS 

### o PRECIPITATION SNOW ICE PELLETS AND DAXE
a: 90'L" ]2' 

### I" 32" < 

### o· D DEP. HEAVY FOG 1 0.38 01-02 

### '.B 01-02 16 

### I 06+ 

### o I 14 

### I 29 1 -870 CLEAR 4 PARTLY CLOUDY 2 CLOUDY 25 

### I

11 EXTREME FOR THE MONTH
- LAST OCCURRENCE IF MORE THAN ONE. T TRACE AHOUN'1'. DATA IN COLS 6 AND 12-15 ARE BASED ON 21 OR MORE OBSERVATIONS AX HOURLY INTERVALS. RESULTANT WINO IS THE VECTOR SUM OF WIND SPEEDS + ALSO ON EARLIER DAXE(S). BEAVY FOG: VISIBILITY 1/4 MILE OR LESS. BLANK ENTRIES DENOTE MISSING OR UNREPORTED DATA. AND DIRECTIONS OIVIOED BY THE NUMBER OF OBSERVATIONS. COLS 16 & 17 : PEAK GUST
- HIGHEST INSTANTANEOUS WIND SPEED. ONE OF Tt«l WINOS IS GIVEN UNDER COLS 18 & 19 : FASTES'!' MILE- BIGBEST RECORDED SPEED FOR WHICR A MILE OF WIND PASSES STATION (DIRECTIONIN COMPASS POINTS). FASTEST OBSERVED ONE MINUTE WIND
- HIGHEST ONE MINUTE SPEED (DIRECTION IN TENS OF DEGREES). ERRORS WILL BE CORRECTED IN SUBSEQUENT PUBLICATIONS. I CERTIFY TIlAT TInS IS AN OFFICIAL PUBUCATION OF TIm NATIONALOCEANtC AND ATMOSPHERIC ADMINISTRATION, AND IS COMPILED FROM RECORDS ON FILE AT TIlE NATIONAL CLIM.Kl1CDATA CENTER.**~** 

# ;f)**~** 

# n

# oaa NAl10NAL NATIONAL NATIONAL OCEANIC AND ENVIRONMENTAL SATEJ...LITE. DATA. CUMATIC DATA CENTER DIRECTOR ATMOSPHERIC ADMINISTRATION AND INfORMATION SERVICE ASHEVlllE. NORlH CAROUNA NATIONAL CUMATIC DATA CENTER