_GENERAL DOCUMENTS - C1981017 ‎(229)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ 1999 Correspondence
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

1999 Noxious Weed Density Summary*
Beltline Reference Area#3
Transect #Thistles/sq.m. #oxeve/sq.m. Total/N.m.
1 3.3 0.2 3.5
2 9.3 0 9.3
3 12.7 0.1 12.8
4 6.9 0.4 7.3
5 5.5 0.2 12.7
6 10.4 2.3 12.7
7 10.2 4.8 15.0
8 3.1 0.5 3.6
9 4.8 2.0 6.8
10 6.9 0.4 7.3
Thistle sample mean=7.3 plants per square meter
Oxeye daisy sample mean= 1.1 plants per square meter
Noxious total=8.4 plants per square meter
1998/1999 Thistle Density Comparison
Beltline Reference Area#3
1998 Data
Sample mean.........................10.7 plants per square meter
True mean.............................8.4<U<13; 801/6 C.I.
1999 Data
Sample mean..........................7.3 plants per square meter
True mean..............................5.9<U<8.7; 80%C.I.
Thistle density decreased between years,but the difference was not significant,even at the 801/6 level of
statistical confidence(alpha=.2;2 tail, 9dj).
*Plumeless thistle was by far the dominant thistle present,but no attempt was made to differentiate among
thistle species for the density estimate. Oxeye daisy density was not estimated in 1998.