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Pacific Southwest, Region 9: Superfund

Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations

San Gabriel Valley (area 1) El Monte, South El Monte, Whittier Narrows

Superfund Site

Record of Decision

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Date Title / pdf File
09/01/00 South El Monte Operable Unit, Interim Record of Decision, Tables
Table 1
Summary of Chemicals of Concern and Exposure Point Concentrations in Groundwater

South El Monte Operable Unit

Production Well or Well Group
Chemical of Concern
Frequency of Detection
Mean
Concentration (ppb)
Maximum Concentration (ppb)
RME Exposure Point Concentration (ppb)
Statistical Measure
Production Well 01900725
PCE
8/8
1.4
2
1.6
95% UCL
Production Well 01900791
PCE
1/3
0.4
0.7
0.7
Maximum
Production Well 01900792
PCE
3/4
1.4
1.9
1.9
Maximum
TCE
3/4
0.54
0.7
0.7
Maximum
Production Well 01901694
PCE
1/1
NA
4
4
Maximum
Production Well 01902612
PCE
1/1
NA
7
7
Maximum
Production Well 01902664
PCE
1/1
NA
3
3
Maximum
TCE
1/1
NA
5
5
Maximum
Production Well 01903057
None of the 8 risk drivers detected
NA
NA
NA
NA
NA
Production Well 01903081
PCE
9/9
0.9
1.3
1.1
95% UCL
Production Well 08000113
PCE
1/3
0.4
0.8
0.8
Maximum
Production Well 31900746
PCE
7/8
0.8
1.6
1.1
95% UCL
TCE
2/4
1.6
0.6
0.6
Maximum
Production Well 31900747
PCE
5/8
0.6
1
0.8
95% UCL
Production Well 31903103
PCE
8/8
1.4
1.7
1.5
95% UCL
TCE
1/2
2.0
1.4
1.4
Maximum
Production Well 41900745
PCE
7/7
1.9
3.3
2.4
95% UCL
TCE
1/7
0.3
0.5
0.4
95% UCL
Production Well 41902713
PCE
5/8
0.4
1.6
0.7
95% UCL
Well Group 1
1,2-DCA
4/4
6.7
7.1
7.1
95% UCL
Well Group 2
Benzene
1/16
0.3
1.1
0.4
95% UCL
PCE
16/16
123
710
196
95% UCL
TCE
14/16
27
400
70
95% UCL
Well Group 3
Benzene
13/52
0.42
2.44
0.66
95% UCL
1,2-DCA
2/52
0.60
2.78
0.83
95% UCL
Cis-1,2-DCE
24/27
3.76
12.1
4.99
95% UCL
PCE
47/52
399
8,900
692
95% UCL
TCE
50/52
95
620
127
95% UCL
Vinyl Chloride
11/52
1.64
18
2.44
95% UCL
Well Group 4
Benzene
18/31
134
880
212
95% UCL
1,2-DCA
13/31
16.2
110
24.5
95% UCL
Cis-1,2-DCE
9/31
2.8
3.2
3.2
Maximum
PCE
14/31
13
42
17
95% UCL
TCE
18/31
13.9
63
19.7
95% UCL
Well Group 5
1,2-Dichloroethene
3/3
37
98
98
Maximum
PCE
1/3
27
72
72
Maximum
TCE
3/3
46
79
79
Maximum
Well Group 6
Benzene
1/2
0.5
0.7
0.7
Maximum
1,2-DCA
2/2
2.5
3.8
3.8
Maximum
Cis-1,2-DCE
2/2
190
348
348
Maximum
1,2-DCP
1/2
1.8
3.4
3.4
Maximum
PCE
2/2
67
132
132
Maximum
TCE
2/2
56.5
99
99
Maximum
Vinyl Chloride
2/2
16
29
29
Maximum
Well Group 7
1,2-DCA
1/3
5.3
6
6
Maximum
1,2-DCE
1/3
5
5
5
Maximum
PCE
2/3
22
43
43
Maximum
TCE
2/3
16
29
29
Maximum
Well Group 8
1,2-DCA
1/16
0.3
0.5
0.3
95% UCL
Cis-1,2-DCE
14/16
9.7
22
13
95% UCL
PCE
16/16
43
170
67
95% UCL
TCE
16/16
10.5
23
13.5
95% UCL
Vinyl Chloride
1/16
0.4
0.6
0.5
95% UCL
Well Group 9
Benzene
2/17
2.2
0.8
0.8
Maximum
1,2-DCE
2/6
9.2
19
13.7
95% UCL
Cis-1,2-DCE
4/9
1.1
5.4
2.2
95% UCL
PCE
17/17
171
790
272
95% UCL
TCE
14/17
18
120
32
95% UCL
Well Group 10
PCE
4/4
155
348
320
95% UCL
TCE
4/4
6.3
12
11
95% UCL
Well Group 11
Benzene
2/3
6
5
5
Maximum
1,2-DCA
1/3
9
11
11
Maximum
1,2-DCE
3/3
1,019
2,800
2,800
Maximum
PCE
3/3
37
78
78
Maximum
TCE
3/3
60
110
110
Maximum
Well Group 12
PCE
7/7
362
640
482
95% UCL
TCE
5/7
7.4
8.6
8.6
Maximum
Well Group 13
Benzene
1/3
1.7
0.2
0.2
Maximum
Cis-1,2-DCE
1/2
0.3
0.6
0.6
Maximum
PCE
3/3
260
536
536
Maximum
TCE
3/3
9.1
12.2
12.2
Maximum
Well Group 14
1,2-DCA
8/11
1.8
2.7
2.5
95% UCL
Cis-1,2-DCE
1/1
0.4
0.4
0.4
Maximum
PCE
11/11
29
58
38.7
95% UCL
TCE
11/11
13
32
17.5
95% UCL
Well Group 15
PCE
30/30
220.5
620
268.3
95% UCL
TCE
3/30
1.1
2
1.6
95% UCL
Well Group 16
Benzene
2/6
13
12
12
Maximum
1,2-DCE
4/5
89.4
310
210.1
95% UCL
1,2-DCP
1/7
12.2
14
14
Maximum
PCE
6/7
14.2
25
21
95% UCL
TCE
6/7
212.4
760
435.8
95% UCL
Well Group 17
1,2-DCA
4/12
1.0
1.3
1.3
Maximum
Cis-1,2-DCE
11/12
9.4
52.1
17.3
95% UCL
1,2-DCP
1/12
0.8
0.5
0.5
Maximum
PCE
12/12
238.5
480
298
95% UCL
TCE
12/12
24.3
96.2
36.8
95% UCL
Notes:
ND = non-detect
Ppb = parts per billion or g/L (micrograms per liter)
95% UCL = 95 per cent upper confidence limit on the arithmetic mean groundwater concentration.
Table 2

Toxicity Values for Chemicals of Potential Concern

South El Monte Operable Unit

Systemic Toxicity (mg/kg/day)
Carcinogenic Potency (mg/kg/day)
Chem-
ical Name
Oral Refer-
ence Dose
Source
Oral Critical Effect
Inhala-
tion Ref-
erence Dose
Source
Inhala-
tion Critical Effect
Weight of Evi-
dence1
Source
Oral Slope Factor
Source
Inhala-
tion Slope Factor
Source
Tumor Site
Benzene
0.0011
Route Extrapola-tion
--
0.0017
NCEA
--
A
IRIS
0.029
IRIS
0.029
IRIS3
Leukemia
1,2-DCA
0.01
NCEA
--
0.0029
NCEA
--
B2
IRIS
0.091
IRIS
0.091
IRIS3
Stomach, Mammary Lung, Circulatory
1,2-DCE
0.006
HEAST
Liver Lesions
0.009
Route Extrapolation
--
--
--
--
--
--
--
--
Cis-1,2-DCE
0.0017
HEAST
Blood- decreased hematocrit and hemoglobin
0.01
Route Extrapolation
--
D
IRIS
--
--
--
--
--
1,2-DCP
0.0029
Route Extrapola-tion
--
0.0011
Iris2
Increased nasal mucosa
B2
HEAST
0.068
HEAST
0.068
Route Extrapolation
Liver
PCE
0.009
IRIS
Hepatotoxicity in mice, weight gain in rats
0.01
Route Extrapolation
--
C-B2
HEAST
0.052
NCEA
0.002
NCEA3
Liver, Leukemia
TCE
0.01
NCEA
Liver - Toxicity
0/006
Route Extrapolation
-
B2
HEAST
0.011
NCEA
0.006
NCEA3
Lungs, Liver
Vinyl Chloride
--
--
--
--
--
--
A
HEAST
1.9
HEAST
0.3
HEAST3
Lungs, Liver

HEAST = Health Effects Assessment Summary Tables (EPA, 1995b)
IRIS = Integrated Risk Information System (EPA, 1996a)
NCEA = National Center for Environmental Assessment (EPA, 1996b)
1 Weight of Evidence Classification: A is Human Carcinogen; B is Probable Human Carcinogen (B1-limited evidence of carcinogenicity in humans, B2-sufficient evidence of carcinogenicity in animals with inadequate or lack of evidence in humans); C is a Possible Human Carcinogen; D is not classifiable as to Human Carcinogenicity.
2 Inhalation Reference Dose calculated from unit risk.
3 Inhalation Slope Factor calculated from unit risk.

Table 3a

Estimated Total Excess Lifetime Cancer Risk from Potential Current Domestic Use of Groundwater

South El Monte Operable Unit

Average Exposure
Reasonable Maximum Exposure
Wells/Well Groups1
Inges-
tion
Inhalation
Dermal
All Routes
Inges-
tion
Inhalation
Dermal
All Routes
Major Chemical
Contributors
01900725
1.4 x 10-7
5.3 x 10-9
1.6 x 10-8
2 x 10-7
9.8 x 10-7
3.8 x 10-8
1.3 x 10-7
1 x 10-6
PCE
01900791
3.9 x 10-8
1.5 x 10-9
4.6 x 10-9
5 x 10-8
4.3 x 10-7
1.6 x 10-8
5.9 x 10-8
5 x 10-7
01900792
1.5 x 10-7
1.1 x 10-8
1.6 x 10-8
2 x 10-7
1.3 x 10-6
9.4 x 10-8
1.6 x 10-7
2 x 10-6
PCE
01901694
3.9 x 10-7
1.5 x 10-8
4.6 x 10-8
5 x 10-7
2.4 x 10-6
9.4 x 10-8
3.4 x 10-7
3 x 10-6
PCE
01902664
4.0 x 10-7
6.8 x 10-8
3.8 x 10-8
5 x 10-7
2.5 x 10-6
4.2 x 10-7
2.8 x 10-7
3 x 10-6
PCE
01903057
7.0 x 10-8
7.0 x 10-8
3.7 x 10-9
1 x 10-7
5.0 x 10-7
5.0 x 10-7
3.1 x 10-8
1 x 10-6
Carbon Tetrachloride
01903081
1.3 x 10-7
4.3 x 10-8
1.2 x 10-8
2 x 10-7
1.0 x 10-6
4.0 x 10-7
1.2 x 10-7
2 x 10-6
Carbon Tetrachloride, PCE
08000113
3.9 x 10-8
1.5 x 10-9
4.6 x 10-9
5 x 10-8
4.9 x 10-7
1.9 x 10-8
6.7 x 10-8
6 x 10-7
31900746
9.6 x 10-8
7.1 x 10-8
9.7 x 10-9
2 x 10-7
8.1 x 10-7
8.3 x 10-7
9.8 x 10-8
2 x 10-6
PCE, Chloroform
31900747
5.9 x 10-8
2.3 x 10-9
6.9 x 10-9
7 x 10-8
4.9 x 10-7
1.9 x 10-8
6.7 x 10-8
6 x 10-7
31903103
1.7 x 10-7
2.1 x 10-8
1.7 x 10-8
2 x 10-7
1.1 x 10-6
1.3 x 10-7
1.3 x 10-7
1 x 10-6
PCE
41900745
1.9 x 10-7
1.1 x 10-8
2.2 x 10-8
2 x 10-7
1.5 x 10-6
8.5 x 10-8
2.0 x 10-7
2 x 10-6
PCE
41902713
3.9 x 10-8
1.5 x 10-9
4.6 x 10-9
5 x 10-8
4.3 x 10-7
1.6 x 10-8
5.9 x 10-8
5 x 10-7
1 Data from the 13 active production wells were used to evaluate potential current risks in the South El Monte OU area.

Table 3b

Estimated Total Excess Lifetime Cancer Risk from Potential Future Domestic Use of Groundwater

South El Monte Operable Unit

Average Exposure
Reasonable Maximum Exposure
Wells/Well Groups1
Inges-
tion
Inhala-
tion
Dermal
All Routes
Inges-
tion
Inhala-
tion
Dermal
All Routes
Major Chemical Contributors
Well Group 1
1.2 x 10-6
1.2 x 10-6
1.5 x 10-8
2 x 10-6
7.6 x 10-6
7.6 x 10-6
1.2 x 10-7
2 x 10-5
1,2-DCA
Well Group 2
1.3 x 10-5
7.9 x 10-7
1.4 x 10-6
1 x 10-5
1.3 x 10-4
9.7 x 10-6
1.7 x 10-5
2 x 10-4
PCE
Well Group 3
4.7 x 10-5
3.9 x 10-6
4.8 x 10-6
6 x 10-5
5.0 x 10-4
3.7 x 10-5
6.0 x 10-5
6 x 10-4
PCE, TCE, VC
Well Group 4
1.2 x 10-5
1.1 x 10-5
5.7 x 10-7
2 x 10-5
1.1 x 10-4
1.0 x 10-4
6.3 x 10-6
2 x 10-4
Benzene, PCE, TCE, 1,2-DCA
Well Group 5
3.6 x 10-6
6.2 x 10-7
3.5 x 10-7
5 x 10-6
5.4 x 10-5
7.3 x 10-6
6.5 x 10-6
7 x 10-5
PCE, TCE
Well Group 6
6.6 x 10-5
1.1 x 10-5
1.8 x 10-6
8 x 10-5
7.5 x 10-4
1.2 x 10-4
2.5 x 10-5
9 x 10-4
PCE, TCE, VC, 1,2-DCP, 1,2-DCA
Well Group 7
3.4 x 10-6
1.2 x 10-6
2.8 x 10-7
5 x 10-6
3.6 x 10-5
9.5 x 10-6
3.9 x 10-6
5 x 10-5
PCE, TCE, 1,2-DCA
Well Group 8
5.9 x 10-6
5.6 x 10-7
5.3 x 10-7
7 x 10-6
5.4 x 10-5
4.6 x 10-6
6.0 x 10-6
6 x 10-5
PCE, TCE, VC
Well Group 9
1.8 x 10-5
1.5 x 10-6
2.0 x 10-6
2 x 10-5
1.8 x 10-4
1.5 x 10-5
2.3 x 10-5
2 x 10-4
PCE
Well Group 10
1.5 x 10-5
6.6 x 10-7
1.8 x 10-6
2 x 10-5
2.0 x 10-4
8.3 x 10-6
2.7 x 10-5
2 x 10-4
PCE
Well Group 11
7.0 x 10-6
2.8 x 10-6
5.1 x 10-7
1 x 10-5
7.8 x 10-5
2.4 x 10-5
7.5 x 10-6
1 x 10-4
PCE, TCE, 1,2-DCA
Well Group 12
3.6 x 10-5
1.5 x 10-6
4.1 x 10-6
4 x 10-5
3.0 x 10-4
1.2 x 10-5
4.1 x 10-5
3 x 10-4
PCE
Well Group 13
2.6 x 10-5
1.1 x 10-6
3.0 x 10-6
3 x 10-5
3.3 x 10-4
1.4 x 10-5
4.5 x 10-5
4 x 10-4
PCE
Well Group 14
3.5 x 10-6
7.9 x 10-7
3.5 x 10-7
5 x 10-6
3.0 x 10-5
7.1 x 10-6
3.4 x 10-6
4 x 10-5
PCE
Well Group 15
2.2 x 10-5
8.5 x 10-7
2.5 x 10-6
3 x 10-5
1.6 x 10-4
6.5 x 10-6
2.3 x 10-5
2 x 10-4
PCE
Well Group 16
8.1 x 10-6
4.7 x 10-6
4.1 x 10-7
1 x 10-5
8.6 x 10-5
4.7 x 10-5
4.9 x 10-6
1 x 10-4
PCE, TCE, 1,2-DCP
Well Group 17
2.4 x 10-5
1.6 x 10-6
2.8 x 10-6
3 x 10-5
1.9 x 10-4
1.2 x 10-5
2.5 x 10-5
2 x 10-4
PCE
1 Data from the 17 Well Groups (representing the highly contaminated portions of the South El Monte OU) were used to evaluate potential future risks in the South El Monte OU area.
Table 4a
Estimated Total Noncancer Hazard Index from Potential Current Domestic Use of Groundwater
South El Monte Operable Unit
Average Exposure
Reasonable Maximum Exposure
Wells1
Ingestion
Inhalation
Dermal
All Routes
Ingestion
Inhalation
Dermal
All Routes
Major Chemical Contributors
01900725
0.00214
0.00219
0.00024
0.005
0.00455
0.00463
0.00061
0.010
01900791
0.00059
0.00059
0.00007
0.001
0.00192
0.00192
0.00026
0.004
01900792
0.00338
0.00338
0.00029
0.007
0.00840
0.00840
0.00087
0.02
01901694
0.00587
0.00587
0.00068
0.01
0.01096
0.01096
0.00151
0.02
01902664
0.01664
0.01664
0.00099
0.03
0.03105
0.03105
0.00218
0.06
01903057
0.01468
0.01803
0.00078
0.03
0.03131
0.03845
0.00198
0.07
01903081
0.00971
0.01163
0.00060
0.02
0.02650
0.03185
0.00190
0.06
08000113
0.00059
0.00059
0.00007
0.001
0.00219
0.00219
0.00030
0.005
31900746
0.00323
0.00323
0.00021
0.007
0.00795
0.00795
0.00060
0.02
31900747
0.00088
0.00088
0.00010
0.002
0.00219
0.00219
0.00030
0.005
31903103
0.00548
0.00548
0.00037
0.01
0.01050
0.01050
0.00086
0.02
41900745
0.00352
0.00352
0.00035
0.007
0.00840
0.00840
0.00099
0.02
41902713
0.00059
0.00059
0.00007
0.001
0.00192
0.00192
0.00026
0.004
1 Data from the 13 active production wells were used to evaluate potential current risks in the South El Monte OU area.

Table 4b
Estimated Total Noncancer Hazard Index from Potential Future Domestic Use of Groundwater

South El Monte Operable Unit

Average Exposure
Reasonable Maximum Exposure
Wells1
Ingestion
Inhalation
Dermal
All Routes
Ingestion
Inhalation
Dermal
All Routes
Major Chemical
Contributors
Well Group 1
0.0339
0.0339
0.0004
0.07
0.671
0.671
0.001
0.1
Well Group 2
0.2496
0.2495
0.0238
0.5
0.8638
0.8638
0.0893
2
PCE
Well Group 3
0.8565
0.8602
0.0788
2
2.5736
2.5832
0.2929
5
PCE, TCE
Well Group 4
1.3635
1.4074
0.0792
3
4.0191
4.1858
0.2790
8
Benzene
Well Group 5
0.2126
0.2126
0.0113
0.4
0.8563
0.8563
0.0575
2
TCE
Well Group 6
0.5799
0.5748
0.0252
1
1.9678
1.9525
0.1039
4
Cis-1,2-DCE
Well Group 7
0.1100
0.1090
0.0059
0.2
0.3350
0.3313
0.0240
0.7
Well Group 8
0.1069
0.1068
0.0088
0.2
0.2897
0.2893
0.0295
0.6
Well Group 9
0.4435
0.3412
0.0339
0.8
1.3065
1.0015
0.1185
2
PCE
Well Group 10
0.2433
0.2432
0.0271
0.5
0.9277
0.9276
0.1233
2
PCE
Well Group 11
2.0284
2.0846
0.0586
4
9.6574
9.8138
0.3170
20
1,2-DCE, TCE
Well Group 12
0.5850
0.5852
0.0666
1
1.4799
1.4810
0.1954
3
PCE
Well Group 13
0.4072
0.4071
0.0455
0.9
1.5316
1.5311
0.2055
3
PCE
Well Group 14
0.1302
0.1266
0.0078
0.3
0.3407
0.3317
0.0237
0.7
Well Group 15
0.3299
0.3293
0.0380
0.7
0.7565
0.7548
0.1024
2
PCE
Well Group 16
0.9605
0.9580
0.0356
2
3.2491
3.2404
0.1401
7
TCE, 1,2-DCE
Well Group 17
0.4448
0.4441
0.0440
0.9
1.0809
1.0790
0.1230
2
PCE
1 Data from the 17 Well Groups (representing the highly contaminated portions of the South El Monte OU) were used to evaluate potential future risks in the South El Monte OU area.

Table 5
Cost Comparison of Alternatives
($1,000s)
Alternative
Capital Costs
Annual O&M Costs
Net Present Worth (30-years @ 7%)
Using New Facilities Using Existing FacilitiesUsing New Facilities Using Existing Facilities
2
450
90
1,540
3
5,880
3,670
840
14,150
11,930
4
6,290
4,080
1,130
18,110
15,890


Table 6
Chemical-Specific ARARs for Chemicals of Concern
Compound
ARAR(ug/L)
Source
Acetone
-
-
Benzene
1
California MCL
Bromochloromethane
-
-
Carbon Disulfide
-
-
Carbon Tetrachloride
0.5
California MCL
Chlorobenzene
70
California MCL
Chloroethane
-
-
Chloroform1
100
Federal MCL
Chloromethane
-
-
1,2-Dibromomethane
0.05
Federal MCL
1,4-Dichlorobenzene
5
California MCL
1,1-Dichloroethane
5
California MCL
1,1-Dichloroethene
6
California MCL
1,2-Dichloroethane
0.5
California MCL
1,2-Dichloroethene
-
-
cis-1,2-Dichloroethene
6
California MCL
trans-1,2-Dichloroethene
10
California MCL
1,2-Dichloropropane
5
Federal MCL
2,2-Dichloropropane
-
-
1,1-Dichloropropene
-
-
1,3-Dichloropropene
0.5
California MCL
Ethylbenzene
700
Federal MCL
Isopropylbenzene
-
-
Methyl Ethyl Ketone
-
-
Methylene Chloride
5
Federal MCL
Naphthalene
-
-
n-Propylbenzene
-
-
Styrene
100
Federal MCL
Tetrachloroethene
5
Federal MCL
Toluene
150
California MCL
1,1,2-Trichloro-1,2,2-trifluoroethane
1,200
California MCL
1,1,1-Trichloroethane
200
Federal MCL
1,1,2-Trichloroethane
5
Federal MCL
Trichloroethene
5
Federal MCL
Trichlorofluoromethane
150
California MCL
1,2,4-Trimethylbenzene
-
-
1,3,5-Trimethylbenzene
-
-
Vinyl Chloride
0.5
California MCL
Xylenes, Total
1,750
California MCL
1This chemical is one of the four trihalomethanes (THMs); the MCL listed is for all four THMs combined: chloroform, bromodichloromethane, dibromochloromethane, and bromoform.
Notes: - indicates "no MCL has been established or proposed."
Table 7
Detailed Costs Estimates for the Selected Remedy
South El Monte OU - Interim ROD
Component
Quantity
Unit
Unit Cost ($)
Cost ($)
Capital Costs
Capital Costs (including Engineering and Management)
Monitoring
New MP® monitoring wells
2
ea.
108,900
217,800
Initial ground water monitoring
1
ls.
52,000
52,000
Monterey Park Module No. 1 (near wells 12 and 15)
Install and equip. extraction wells
2
ea.
229,050
458,100
Land Acquisition
1
ls.
125,000
125,000
Treatment system
1
ls.
705,600
705,600
Conveyance piping
2
ls.
133,500
267,000
Monterey Park Module No. 2 (near Well 5)
Install and equip. extraction well
1
ea.
226,500
226,500
Land Acquisition
1
ls.
125,000
125,000
Treatment system
1
ls.
464,700
464,700
Conveyance piping
1
ls.
125,000
125,000
SCWC Module (near wells San Gabriel 1 and 2)
Install and equip. extraction wells
2
ea.
226,500
453,000
Land Acquisition
1
ls.
125,000
125,000
Treatment system
1
ls.
518,400
518,400
Conveyance piping
1
ls.
125,000
125,000
SGVWC Module (near Plant 8)
Install and equip. extraction wells
1
ea.
226,500
226,500
Land Acquisition
1
ls.
125,000
125,000
Treatment system
1
ls.
650,100
650,100
Conveyance Piping
1
ls.
125,000
125,000
Capital Cost Subtotal
5,115,000
Contingencies (15 percent)
767,000
TOTAL ESTIMATED CAPITAL COST
5,882,000
Annual Operations & Maintenance Costs
Quantity
Unit Cost
Annual Cost ($)
Present Worth Cost (1) ($)
Long-term Ground Water Monitoring
1
85,100
85,100
1,056,000
Monterey Park Module No. 1 (Wells 12 and 15)
30 years operation
Treatment system monitoring
1
40,200
40,200
499,000
Remediation system operation
1
146,000
146,000
1,812,000
Monterey Park Module No. 2 (Well 5)
10 years operation
Treatment system monitoring
1
28,400
28,400
199,000
Remediation system operation
1
95,500
95,500
671,000
SCWC Module (Wells San Gabriel 1 and 2)
5 years operation
Treatment system monitoring
1
32,400
32,400
133,000
Remediation system operation
1
109,000
109,000
447,000
SGVWC Module (Wells 8B, C and D)
30 years operation
Treatment system monitoring
1
43,800
43,800
544,000
Remediation system operation
1
147,300
147,300
1,828,000
Annual O&M Subtotal:
727,700
7,189,000
O&M Contingencies (15 percent)(1) 109,200
1,078,000
Annual O&M Total:
837,000
TOTAL DISCOUNTED O&M COST(1)
8,267,000
TOTAL CAPITAL COSTS
5,882,000
ESTIMATED PRESENT WORTH COST
14,149,000
Notes
(1) Based on 5 to 30-year project and a 7% discount rate.
(2) Net Present Value Factors = 12.409 for 30 years, 7.024 for 10 years, and 4.100 for 5 years.
Capital cost estimates are not discounted because the construction work will be performed in the early stages of the project. O&M costs are reported as present worth estimates given a 7% discount rate for a duration that varies between 5 and 30 years. Cost estimates are based on extraction rates and influent quality estimates that may be refined during remedial design. Cost estimates are expected to be within a +50 to -30% accuracy range.
''ls. = lump sum;
ea. = each

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