PERMFILE70701

• Permit No: M1991003
• IBM Index Class Name: Permit File
• Section_Exhibit Name: INDEX
• Media Type: D
• Archive: No

PUEBLO AREA, COLORADO
properties of the soils--Continued
i

65
Percentage less than 9 inches
paining sieve-

Perme-
Available
water

Reaction

Salinity

Shrink•ewell potential
H dro-
lo
i

ability
capacity g
c
soil
No.4 No. 10 No. 40 No. 200
group
(4.7 mm) (2.0 mm) (O.d2 mm) (0.074 mmj

!n yn hr °7 ~[ nH at is°C
80-95 75-90 65-8b 45-65 0.6-2.0 0.05-0.07 6.6-7.8 <2 Low__________________ C
50.60 96-45 3010 25-40 0.06-0.2 0.07-0.09 7.4-8.4 <2 Moderate.
100. 90-100 65-95 95-75 0.6-2.0 0.16-0.19 6.1-7.4 <2 Low__________________ B
100 90-100 75-L00 60-90 0.6-2.0 0.16-0.21 6.6-8.4 <2 Low.
x'86-i00 .`,,.76A6 IQ-66 `26-35r 0.6-2.4 :.OAB-0.l$ 7.2-8:0 <2 law------------------ D ,
100 100 65-85 15-35 > 20 0.07-0.12 6.6-7.3 <2 Low__________________ A
100 96-100 65-80 6-20 > 20 0.06-0.10 6.6-7.8 <2 Imw.
66-65 46-66 40-50 35-45 0.06-0.2 0.11-0.18 6.6-7.3 <2 High_________________ D
100 90-100 60-86 30-45 2.0-6.0 0.11-0.13 6.6-7.3 <2 Low_______________ ___ H
100 90-100 65-90 30-50 6.0-20 0.12-0.14 6.6-8.4 <2 Low.
100 90-100 60-70 15-30 > 20 0.06-0.11 7.4-8.d <2 Low.
100 90-100 50-75 15-30 >20 0.09-0.11 6.6-7.3 <2 Low__________________ B
100 90-100 65-90 30-50 6.0-20 0.12-0.14 6.6-8.4 <2 Low.
100 90-100 60-70 15-30 20 0.08-0.11 7.4-8.4 <2 Low.
80-80 60-75 35-45 20-30 6.0-20 0.07-0.09 6.1-7.3 <2 Low__________________ D
60-70 55-66 90-40 25-35 6.0-20 0.07-0.09 6.1-7.3 <2 Low.
100 100 90-]00 70-90 0.6-2.0 0.19-0.21 7.4-7.8 <2 Low__________________ B
100 100 90-100 70-95 0.2-0.6 0.19-0.21 7.9-8.4 <2 Low.
100 100 90-100 70-90 0.2-0.6 0.16-0.21 7.9-8.4 <2 Low.
I
D

95-100
i
96-100
90-100
70-95
0 06-0.2
0.19-0.21
6.6-8.4
2 8
High.
saturation extract, in millimhos per centimeter at
26° C. Salinity affects the suitability of a soil for crops,
its stability when used as construction material, and
its corrosiveness to metals and concrete.
Shrink-swell potential is the relative change in vol-
ume of soil material to be expected with changes in
moisture content, that is, the extent to which the soil
shrinks as it dries out or swells when it gets wet. Ex-
tent of shrinking and swelling is influenced by the
amount and kind of clay in the soil. Shrinking and
swelling of soils cause much damage to building
foundations, roads, and other structures. A high
shrink-swell potential indicates a hazard to the mainte-
nance of structures built in, on, or with material that
has this rating.
Hydrologic soil group classifies the soils into four
oups according to their infiltration and transmission
rates. The groups are designated A (low runoff poten-
tial), B, C, and D (high runoff potential) (11 ).
Interpretations for the corrosivity to uncoated steel
and concrete are not shown in table 5. Most soils in the
survey area have a high corrosivity to uncoated steel
pipe and a medium corrosivity to concrete. corrosivity
pertains to potential soil-induced chemical action that
dissolves or weakens uncoated steel or concrete. Rate
of corrosion of uncoated steel is related to such soil
properties as drainage, texture, total acidity, and
electrical conductivity of the soil material. corrosivity
to concrete is influenced mainly by the content of
sodium or magnesium sulfate, but also by soil texture
and acidity. Installations of uncoated steel that inter-
sect soil boundaries or soil horizons are more suscep-
tib]e to corrosion than installations made entirely in
one kind of soil or in one soil horizon.