WSP00928

• File Number: 8220.105.I
• Description: Colorado River-Water Projects-Navajo-Environmental Studies
• State: CO
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 10/1/2001
• Author: BOR
• Title: Navajo Dam EIS-Biological Assessment-Preliminary Draft
• Water Supply Pro - Doc Type: EIS

Attachment C. -Historic water quality measurements on the San Juan River
Fannington Shiprock Four Comers Bluff
Parameter n Mean n Mean n Maan n Mean
Alkalinity totallmg/L as CaCO,) 607 114 646 119 59 121 2,333 147
Aluminum dissolved 1/19/L as All 34 34.4 138 58.5 40 63.9 174 64.1
Aluminum total 1119/1 as All 30 5.283 83 i5,6..16.su ii,.$7~ i34- 2v.5uu
Arsenic dissolved 1/19/L as AsI 76 1.9 267 2.3 78 1.8 345 1.9
Arsenic total 1/19/L as Asl 78 2.8 224 4.4 72 3.8 309 4.3
80ron dissolved 1/19/L as 81 315 49.5 678 103.9 45 126.0 1.720 68.7
Cadmium dissolved 1/19/L as Cdl 11 0.8 71 0.9 15 1.2 56 1.0
Cadmium total I/l9!L as Cdl 12 5.7 29 3.6 7 3.7 15 3.7
Calcium dissolved Img/L as Cal 859 61.6 1,178 72.4 135 65.6 2.627 93.8
Calcium total Img/L as Cal 5 71.5 12 70.8 6 78.8 23 88.8
Chloride total in water Img/LI 830 9.8 1,084 16.9 104 13.5 2,568 20.6
Chromium dissolved 1/19/L as Crl 4 11.3 53 3.2 4 2.9 48 2.5
Chromium total 1/19/L as Crl 9 51.8 25 22.5 5 17.0 17 52.1
Cobalt dissolved 1/19/L as Col 9 1.5 67 1.4 10 1.6 53 1.5
Cobalt total 1/19/L as Col 13 44.4 29 22.9 7 10.6 21 41.7
Copper dissolved I/l9!L as Cui 45 3.8 165 4.2 48 5.0 203 4.9
Copper total 1/19/L as Cui 45 29.5 121 35.5 42 20.8 163 35.8
Hardness calc. Img/L as CaCO,) 859 189 1.154 237 123 222 2589 326
Hardness total Img/L as CaCO,) 824 189 969 245 45 224 2423 336
Iron dissolved 1/19/L as Fel 164 47.2 251 31.2 42 22.0 69 30.5
Iron total 1/19/L as Fei 15 25,691 39 30,449 13 13,405 201 4,809
Lead dissolved 1/19/L as Pbl 67 0.7 256 1.5 70 0.8 343 1.0
Lead total 1/19/L as Pbl 79 30.3 222 27.6 71 23.6 305 26.1
Magnesium dissolved Img/L as Mgl859 8.4 1,176 13.4 135 14.4 2,628 25.0
Magnesium total Img/L as MgI 5 11.9 12 14.0 6 17.4 23 27.1
Manganese dissolved 1/19/L as Mnl26 22.3 110 45.0 30 6.3 86 6.1
Manganese total 1/19/L as Mnl 20 852 56 978 27 449 39 1,109
Mercury dissolved 1/19/L as HgI 70 0.12 254 0.13 75 0.10 338 0.11
Mercury total 1/19/L as HgI 78 0.14 225 0.15 71 0.13 309 0.14
Nickel dissolved 1/19/L ss Nil 28 6.1 146 4.6 36 5.2 184 4.6
Nickel total 1/19/L as Nil 28 6.8 105 12.1 39 9.7 144 15.5
Nitrite + nitrste total Img/L ss NI 47 0.27 98 0.39 27 0.74 55 0.78
Oxygen dissolved Img/LI 251 9.5 455 9.8 159 9.5 478 9.2
pH Isb IstsndarrJ unitsl 879 7.81 1,097 7.89 107 8.25 1,357 7.78
pH field (standard units) 60 8.13 190 8.26 60 8.25 285 8.20
Phosphorus totsl Img/L ss PI 59 0.27 164 0.32 31 0.37 95 0.58
Residue total filtrable Idriad at
18U' CI Img/LI 374 382 667 498 102 422 1.313 656
Selenium dissolved 1/19/L ss Sal 81 0.6 277 1.0 78 1.3 349 1.1
Selenium totsl 1/19/L ss Sel 76 0.7 227 0.9 71 1.6 309 1.4
Selenium total recoverable
I/l9!L as Se) 10 0.5 29 1.0 10 0.9 47 0.8
Silver dissolved 1/19/L ss AgI 2 0.75 51 0.56 n/a n/s 45 0.56
Silver total I/l9!L ss AgI 2 0.75 10 1.10 n/s n/s 9 2.06
Sodium dissolved Img/L as NsI 836 44.7 951 64.6 112 49.3 2.047 79.2
Sodium totsl Img/L as Nal 5 37.7 12 38.5 6 43.8 23 58.2
Solids susp. -residuB on Bvap. 59 242 191 956 60 663 283 934
Specific conductance 905 550 1136 716 112 644 2.020 931
Sulfste totsl Img/L as SO.J 827 154 1.083 225 104 193 2,568 329
Wster temperature rCI 60 10.6 227 12.2 79 12.4 343 12.6
Zinc dissolved 1/19/L as Znl 80 9.2 268 9.2 77 7.8 346 15.7
Zinc totsl 1/19/L as Znl 75 92.9 224 114.1 71 204.0 306 109.6
Source: Final Supplemental Environmental Impact Statement, ALP Project, Technical Water Quality Analys;s, July 2000.
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