Environmental Engineering Reference
In-Depth Information
Table 7-3 Summary of Results of Chemical Analysis of Stormwater Runoff from
Warehouse Roof, San Diego County Left
Roof
SanConstituent
12/7/07
12/19/07
1/5/08
1/23/08
Hardness (mg/L)
5
9.4
2.4
15
SSC (mg/L)
9.78
43.6
6.63
25.5
>
63
µ
m
4.09
13
3.03
10.2
<
63
µ
m
5.69
30.6
3.6
15.2
TSS (mg/L)
7.3
18
18
22
COD (mg/L)
4.1
14
7
17
DOC (mg/L)
2.1
3.8
1.5
1.1
Total P
0.029
0.089
0.032
0.078
0.0074
a
Ortho-P (mg/L)
0.013
0.015
0.018
0.067
a
0.071
a
Ammonia-N (mg/L)
0.23
0.16
TKN (mg/L)
0.48
0.95
0.32
0.84
0.049
a
Nitrate-N (mg/L)
0.29
0.37
0.082J
0.079
a
Total cadmium (
µ
g/L)
0.49
0.33
0.26
0.076
a
0.12
a
Diss. cadmium (
µ
g/L)
0.38
0.35
Total copper (
µ
g/L)
3.7
4.5
1.2
4.9
Diss. copper (
µ
g/L)
2.1
4.4
0.85
0.78
Total lead (
µ
g/L)
3.4
1.7
0.66
24
Diss. lead (
µ
g/L)
0.46
1.3
0.24
0.37
Total zinc (
µ
g/L)
83
81
53
79
Diss. zinc (
µ
g/L)
72
79
42
34
Calculated values
b
Oil&grease
COD
(mg/L)
3.9
4.2
4
4.3
Oil&grease
DOC
(mg/L)
0.74
1.2
0.57
0.46
Source:
Data from Kinnetic Labs, Santa Cruz, CA, 2008.
a
The value is an estimate.
b
An equipment malfunction prevented the autosampler from sampling.
materials (fiberglass, plastics, steel, or concrete) or constructed in place (concrete,
brick, or other materials) and can be installed underground or on the surface.
The storage size of cisterns can range from 200 to 10,000 gallons (Figure 7-31).
Greater storage can be provided in below-grade structures, but multiple tanks are
usually more efficient.
Rain barrels are best used in areas that are adjacent to landscaped beds or
gardens, since this BMP is used primarily to supplement irrigation. Rain barrels
can be used on residential properties, but can also be used at schools and cam-
puses, commercial offices, and any other area where highly aesthetic landscaping
features are important. Cisterns can be used in any land use where a significant
water need exists. Cisterns are used to either supplement gray water needs (toi-
let flushing or some other sanitary sewer use), for irrigation, or for potable use
following disinfection and fine filtration.
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