TM 5-818-5/AFM 88-5, Chap 6/NAVFAC P-418
Table 3-2. Specific Yield of Water-Bearing Deposits in Sacramento Valley, California
Specific
Yield
percent
Material
Gravel
25
20
Sand, including sand and gravel, and gravel and sand
Fine sand, hard sand, tight sand, sandstone, and related
10
deposits
Clay and gravel, gravel and clay, cemented gravel, and
r e l a t e d deposits
5
C l a y , silt, sandy clay, l a v a rock, and related fine-
grained deposits
3
(From "Ground Water Hydrology by D. K. Todd, 1959, Wiley & Sons,
Inc. Used with permission of Wiley & Sons, Inc.)
Table 3-3. Indicators of Corrosive and Incrusting Waters
Indicators of
Indicators of
Incrusting Water
Corrosive Water
A pH greater than 7
1.
1.
A pH less than 7
2 . Total iron (Fe) in excess
2.
Dissolved oxygen in excess of 2 ppm
of 2 ppm
3. Total manganese (Mn) in
3.
H y d r o g e n sulfide (H 2S) in excess of
excess of 1 ppm in con-
1 ppm, detected by a rotten egg
junction with a high pH
odor
and the presence of
oxygen
4 . Total carbonate hardness
4.
T o t a l dissolved solids in excess of
in excess of 300 ppm
1,000 ppm indicates an ability to
c o n d u c t electric current great
e n o u g h to cause serious electro-
lytic corrosion
C a r b o n dioxide (CO 2) in excess of
5.
50 ppm
Chlorides (Cl) in excess of 500 ppm
6.
(Courtesy of UOP Johnson Division)
3-5
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