PLATTE RIVER BASIN

BIG THOMPSON PROJECT-Continued

402518105131300 BIG THOMPSON RIVER BELOW BIG THOMPSON POWER PLANT NEAR LOVELAND, CO

WATER-QUALITY RECORDS

LOCATION.--Lat 40°25'18", long 105°13'13", in SW14SE14 sec.3, T.5 N., R.70 W., Larimer County, Hydrologic Unit 10190006, approximately 280 ft downstream of bridge, approximately 1.7 mi from Hwy 34, approximately 880 ft downstream of Big Thompson Hydroelectric Power Plant.

DRAINAGE AREA.--306 mi2.

PERIOD OF RECORD.--March 2001 to current year. For a complete listing of historical data available for this site, see http://waterdata.usgs.gov/co/nwis/inventory/?site_no=402518105131300

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Time	Instan- taneous dis- charge, cfs (00061)	Turbid- ity, wat unf lab, Hach 2100AN NTU (99872)	Dis- solved oxygen, mg/L (00300)	pH, water, unfltrd field, std units (00400)	Specif. conduc- tance, wat unf uS/cm 25 degC (00095)	Temper- ature, water, deg C (00010)	Hard- ness, water, unfltrd mg/L as CaCO3 (00900)	Calcium water, fltrd, mg/L (00915)	Magnes- ium, water, fltrd, mg/L (00925)	Potas- sium, water, fltrd, mg/L (00935)	Sodium adsorp- tion ratio (00931)	Sodium, water, fltrd, mg/L (00930)
OCT
09...	1050	57	11	--	7.9	58	11.0	20	6.15	1.24	0.71	0.3	3.46
NOV
20...	1100	29	<1.0	12.5	8.0	62	1.5	20	6.00	1.29	0.72	0.4	3.73
DEC
11...	1040	26	1.1	12.6	8.3	79	0.5	26	7.91	1.60	1.00	0.4	4.65
JAN
15...	1045	29	<1.0	12.3	8.2	73	0.0	26	7.89	1.59	0.97	0.4	4.41
FEB
12...	1200	28	<1.0	12.9	7.7	83	1.0	28	8.23	1.70	1.07	0.4	5.16
MAR
26...	1110	64	6.7	10.6	8.2	138	6.0	42	12.2	2.88	1.37	0.6	8.32
APR
16...	1015	154	3.6	10.1	8.2	103	8.0	34	9.76	2.32	1.06	0.4	6.01
MAY
07...	1100	117	4.0	9.9	8.1	93	8.0	29	8.21	2.09	0.88	0.4	5.31
21...	1120	412	3.9	9.4	7.9	68	10.0	23	6.49	1.65	0.85	0.4	4.12
JUN
04...	1140	1,030	5.8	9.7	7.5	28	10.0	11	3.10	0.729	0.60	0.2	1.73
18...	1045	594	3.0	9.1	7.6	26	11.5	9	2.67	0.633	0.46	0.2	1.40
JUL
09...	1045	346	<1.0	8.2	7.5	23	15.5	8	2.43	0.540	0.33	0.2	1.45
23...	1020	268	3.1	8.0	7.5	24	17.5	9	2.66	0.557	0.36	0.2	1.54
AUG
13...	1030	151	3.1	7.8	7.6	35	19.0	16	4.84	1.05	0.58	0.2	1.72
SEP
10...	1045	230	2.9	8.5	7.7	52	15.0	20	5.81	1.25	0.55	0.2	1.95

402518105131300 BIG THOMPSON RIVER BELOW BIG THOMPSON POWER PLANT NEAR LOVELAND, CO-Continued

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Alka- linity, wat flt fxd end lab, mg/L as CaCO3 (29801)	Chlor- ide, water, fltrd, mg/L (00940)	Sulfate water, fltrd, mg/L (00945)	Residue water, fltrd, sum of consti- tuents mg/L (70301)	Residue water, fltrd, tons/ acre-ft (70303)	Residue water, fltrd, tons/d (70302)	Residue on evap. at 180degC wat flt mg/L (70300)	Ammonia + org-N, water, unfltrd mg/L as N (00625)	Ammonia water, fltrd, mg/L as N (00608)	Nitrite + nitrate water fltrd, mg/L as N (00631)	Ortho- phos- phate, water, fltrd, mg/L as P (00671)	Phos- phorus, water, fltrd, mg/L (00666)	Phos- phorus, water, unfltrd mg/L (00665)
OCT
09...	E23	2.18	3.2	--	--	--	35	0.28	<0.015	0.031	0.020	0.030	0.045
NOV
20...	23	2.90	3.6	33	0.05	2.70	35	0.19	<0.015	0.252	E.005	0.011	0.019
DEC
11...	E28	3.33	4.1	--	--	--	47	0.20	<0.015	0.561	0.015	0.022	0.037
JAN
15...	28	2.34	3.7	40	0.07	3.83	50	0.25	0.076	0.500	0.040	0.045	0.058
FEB
12...	29	4.47	<0.2	--	--	--	53	0.22	0.033	0.521	0.027	0.035	0.045
MAR
26...	27	12.8	10.6	71	0.13	16.1	93	0.63	E.014	1.51	0.019	0.029	0.109
APR
16...	28	7.56	7.4	52	0.10	32.1	77	0.41	E.008	0.203	E.005	0.015	0.045
MAY
07...	21	9.17	7.2	46	0.09	20.5	65	0.34	E.009	0.163	E.005	0.013	0.043
21...	18	5.41	5.3	35	0.07	56.2	51	0.40	0.016	0.185	E.006	0.014	0.040
JUN
04...	10	1.17	2.2	16	0.04	88.3	32	0.31	<0.015	0.179	<0.007	0.012	0.036
18...	9	1.09	1.9	14	0.03	38.6	24	0.17	E.009	0.185	<0.007	0.007	0.019
JUL
09...	9	1.04	1.7	14	0.03	17.8	19	0.21	E.010	0.137	0.009	0.015	0.025
23...	9	1.05	1.6	14	0.03	14.4	20	0.18	<0.015	0.173	0.019	0.028	0.035
AUG
13...	14	1.05	2.2	20	0.04	11.1	27	0.33	0.019	0.055	0.009	0.014	0.034
SEP
10...	22	1.27	3.2	27	0.05	24.4	39	0.28	E.014	0.075	<0.007	0.011	0.031

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Arsenic water, fltrd, ug/L (01000)	Copper, water, fltrd, ug/L (01040)	Iron, water, fltrd, ug/L (01046)	Lead, water, fltrd, ug/L (01049)	Mangan- ese, water, fltrd, ug/L (01056)	Mercury water, fltrd, ug/L (71890)	Nickel, water, fltrd, ug/L (01065)	Silver, water, fltrd, ug/L (01075)
OCT
09...	0.3	1.2	52	0.09	2.4	<0.02	0.37	<0.20
NOV
20...	E.1	1.3	30	0.10	2.3	<0.02	0.39	<0.20
DEC
11...	E.2	0.9	34	E.07	2.6	<0.02	0.63	<0.20
JAN
15...	<0.3	0.8	20	0.17	2.1	<0.02	0.48	<0.20
FEB
12...	<0.3	0.9	22	<0.08	1.5	<0.02	0.42	<0.20
MAR
26...	0.3	1.7	58	0.16	7.8	<0.02	0.49	<0.20
APR
16...	E.2	3.7	54	E.06	4.4	<0.02	0.61	<0.20
MAY
07...	E.2	1.5	90	0.09	7.7	<0.02	0.57	<0.20
21...	E.2	5.2	93	E.06	4.5	<0.02	0.37	<0.20
JUN
04...	E.1	1.6	75	0.13	6.3	<0.02	0.33	<0.20
18...	<0.3	1.2	68	<0.08	7.0	<0.02	0.28	<0.20
JUL
09...	<0.3	13.6	52	0.11	3.1	<0.02	0.24	<0.20
23...	<0.3	1.4	58	<0.08	2.5	<0.02	0.19	<0.20
AUG
13...	E.2	20.3	63	<0.08	2.9	<0.02	0.31	<0.20
SEP
10...	E.2	1.2	39	E.05	1.3	<0.02	0.17	<0.20
< -- Actual value is known to be less than the value shown. E -- Estimated laboratory analysis value.

402518105131300 BIG THOMPSON RIVER BELOW BIG THOMPSON POWER PLANT NEAR LOVELAND, CO-Continued

WATER-QUALITY DATA, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003

Date	Benzene water unfltrd ug/L (34030)	Ethyl- benzene water unfltrd ug/L (34371)	meta- + para- Xylene, water, unfltrd ug/L (85795)	o- Xylene, water, unfltrd ug/L (77135)	Toluene water unfltrd ug/L (34010)
OCT
09...	<0.4	<0.4	<0.4	<0.4	<0.4
NOV
20...	<0.4	<0.4	<0.4	<0.4	<0.4
DEC
11...	<0.4	<0.4	<0.4	<0.4	<0.4
JAN
15...	<0.4	<0.4	<0.4	<0.4	<0.4
FEB
12...	<0.4	<0.4	<0.4	<0.4	<0.4
MAR
26...	<0.4	<0.4	<0.4	<0.4	<0.4
APR
16...	<0.4	<0.4	<0.4	<0.4	<0.4
MAY
07...	<0.4	<0.4	<0.4	<0.4	<0.4
21...	<0.4	<0.4	<0.4	<0.4	<0.4
JUN
04...	<0.4	<0.4	<0.4	<0.4	<0.4
18...	<0.4	<0.4	<0.4	<0.4	<0.4
JUL
09...	<0.4	<0.4	<0.4	<0.4	<0.4
23...	<0.4	<0.4	<0.4	<0.4	<0.4
AUG
15...	<0.4	<0.4	<0.4	<0.4	<0.4
SEP
10...	<0.4	<0.4	<0.4	<0.4	<0.4
< -- Actual value is known to be less than the value shown.