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Station Info: NT1201

 
Station ID Year Jurisdiction Watershed Location Description     Latitude         Longitude    
NT1201 2012 North Texas Tollway Authority Headwaters White Rock Creek SH-121 at White Rock Creek 33.104655 -96.7849991

Sampled Events

1st Quarter:
Storm
Summary
Storm
Start
Storm
End
Description Rainfall
Station
Rainfall
Total (in)
Peak
Rate (in)
Antecedent Dry
Period (hrs)
1/9/2012 12:20:00 AM 1/9/2012 3:00:00 AM Heavy rain moved across the area from the west. NT1201 0.62 0.3 485
Collection
Info
Flow
Start
Flow
End
1st Aliquot
Collected
Last Aliquot
Collected
# Aliquots
Collected
Peak
Depth (ft)
Avg
Depth (ft)
Sample
Volume (gal)
Ambient Air
Temp (°F)
Water
Temp (°F)
Sample
Comments
1/9/2012 12:30:00 AM 1/9/2012 3:05:00 AM 12:33:00 AM 2:36:00 AM 6 9.4 3.9 3.5 46 52 The bubbler tubing became clogged by debris resulting in incorrect stage data following program initialization. Because of safety concerns, the sampling crew could not access the bubbler in the stream due to fast flowing waters and darkness, making it unsafe. The flow end time and date are a result of the sampling equipment being removed at the conclusion of the sampling activities.
Composite TDS
(mg/L)
TSS
(mg/L)
BOD
(mg/L)
COD
(mg/L)
Nitrogen
Total (mg/L)
Phosphorus
Dissolved (mg/L)
Phosphorus
Total (mg/L)
Carbaryl
Total (mg/L)
Arsenic
Total (mg/L)
Chromium
Total (mg/L)
Copper
Total (mg/L)
Lead
Total (mg/L)
Zinc
Total (mg/L)
Diazinon Cadmium
188 88 4.64 <1 U 19.2 0.02 0.43 <0.06 U <0.002 U 0.007 J 0.031 0.004 J 0.04 J ** **
Grab Oil & Grease
(mg/L)
pH Lab
(su)
pH Field
(su)
E.Coli
(col/100mL)
Total Coliform
(col/100mL)
Specific Conductivity
(uS/cm)
  PDF icon  Download Lab Report
2.1 J 8.5 190 44000 531

2nd Quarter:
Storm
Summary
Storm
Start
Storm
End
Description Rainfall
Station
Rainfall
Total (in)
Peak
Rate (in)
Antecedent Dry
Period (hrs)
4/3/2012 1:05:00 PM 4/3/2012 3:55:00 PM A line of severe thunderstorms moved across the region from the west bringing multiple tornados, hail, and heavy rain. PL1201 0.24 0.22 289
Collection
Info
Flow
Start
Flow
End
1st Aliquot
Collected
Last Aliquot
Collected
# Aliquots
Collected
Peak
Depth (ft)
Avg
Depth (ft)
Sample
Volume (gal)
Ambient Air
Temp (°F)
Water
Temp (°F)
Sample
Comments
4/3/2012 3:10:00 PM 4/3/2012 5:20:00 PM 4/3/2012 3:17:00 PM 4/3/2012 5:20:00 PM 6 8.4 4.5 3.5 67 69.4 An additional aliquot is shown on the graph that was not collected prior to the flow event. The flow end time and date are a result of the sampling equipment being removed at the conclusion of the sampling activities.
Composite TDS
(mg/L)
TSS
(mg/L)
BOD
(mg/L)
COD
(mg/L)
Nitrogen
Total (mg/L)
Phosphorus
Dissolved (mg/L)
Phosphorus
Total (mg/L)
Carbaryl
Total (mg/L)
Arsenic
Total (mg/L)
Chromium
Total (mg/L)
Copper
Total (mg/L)
Lead
Total (mg/L)
Zinc
Total (mg/L)
Diazinon Cadmium
212 216 16 59 5.64 0.02 0.05 J <0.06 U <0.002 U 0.004 J 0.026 0.005 J 0.044 J ** **
Grab Oil & Grease
(mg/L)
pH Lab
(su)
pH Field
(su)
E.Coli
(col/100mL)
Total Coliform
(col/100mL)
Specific Conductivity
(uS/cm)
  PDF icon  Download Lab Report
38.9 8 550 65000 520

3rd Quarter:
Storm
Summary
Storm
Start
Storm
End
Description Rainfall
Station
Rainfall
Total (in)
Peak
Rate (in)
Antecedent Dry
Period (hrs)
7/1/2012 4:40:00 PM 7/1/2012 5:00:00 PM Isolated showers and thunderstorms developed over the northern portion of the Metroplex and proceeded to the southwest. NT1201 0.18 0.18 338
Collection
Info
Flow
Start
Flow
End
1st Aliquot
Collected
Last Aliquot
Collected
# Aliquots
Collected
Peak
Depth (ft)
Avg
Depth (ft)
Sample
Volume (gal)
Ambient Air
Temp (°F)
Water
Temp (°F)
Sample
Comments
7/1/2012 4:40:00 PM 7/1/2012 7:25:00 PM 7/1/2012 5:22:00 PM 7/1/2012 7:25:00 PM 6 4.4 3.7 3.5 85 86 The flow end time and date were selected to match the time the last aliquot was collected although flow had returned to within 10% of the base flow just prior to this time.
Composite TDS
(mg/L)
TSS
(mg/L)
BOD
(mg/L)
COD
(mg/L)
Nitrogen
Total (mg/L)
Phosphorus
Dissolved (mg/L)
Phosphorus
Total (mg/L)
Carbaryl
Total (mg/L)
Arsenic
Total (mg/L)
Chromium
Total (mg/L)
Copper
Total (mg/L)
Lead
Total (mg/L)
Zinc
Total (mg/L)
Diazinon Cadmium
228 66.67 11.4 50 6.35 0.05 0.4 <0.06 U 0.01 <0.003 U 0.045 0.006 J 0.048 J ** **
Grab Oil & Grease
(mg/L)
pH Lab
(su)
pH Field
(su)
E.Coli
(col/100mL)
Total Coliform
(col/100mL)
Specific Conductivity
(uS/cm)
  PDF icon  Download Lab Report
2.3 J 8.1 5000 250000 345

4th Quarter:
Storm
Summary
Storm
Start
Storm
End
Description Rainfall
Station
Rainfall
Total (in)
Peak
Rate (in)
Antecedent Dry
Period (hrs)
10/14/2012 12:20:00 AM 10/14/2012 2:10:00 AM A frontal boundary moved across the Metroplex brining area wide showers and thunderstorms. NT1201 0.5 0.32 327
Collection
Info
Flow
Start
Flow
End
1st Aliquot
Collected
Last Aliquot
Collected
# Aliquots
Collected
Peak
Depth (ft)
Avg
Depth (ft)
Sample
Volume (gal)
Ambient Air
Temp (°F)
Water
Temp (°F)
Sample
Comments
10/14/2012 12:15:00 AM 10/14/2012 2:25:00 AM 10/14/2012 12:19:00 AM 10/14/2012 2:22:00 AM 6 6.3 4.4 3.5 70 69.3 The flow end time and date are a result of the sampling equipment being removed at the conclusion of the sampling activities.
Composite TDS
(mg/L)
TSS
(mg/L)
BOD
(mg/L)
COD
(mg/L)
Nitrogen
Total (mg/L)
Phosphorus
Dissolved (mg/L)
Phosphorus
Total (mg/L)
Carbaryl
Total (mg/L)
Arsenic
Total (mg/L)
Chromium
Total (mg/L)
Copper
Total (mg/L)
Lead
Total (mg/L)
Zinc
Total (mg/L)
Diazinon Cadmium
200 536 16.3 70 12.4 0.04 0.24 <0.06 U 0.005 J 0.006 J 0.033 0.006 J 0.038 J ** **
Grab Oil & Grease
(mg/L)
pH Lab
(su)
pH Field
(su)
E.Coli
(col/100mL)
Total Coliform
(col/100mL)
Specific Conductivity
(uS/cm)
  PDF icon  Download Lab Report
14.7 8.5 5000 80000 107

Station Averages

Station TDS TSS BOD COD Nitrogen Phosphorus
(Dissolved)
Phosphorus
(Total)
Carbaryl Arsenic Chromium Copper Lead Zinc Diazinon Cadmium Oil &
Grease
E.
Coli
Coliform
(Total)
pH
Lab
pH
Field
Specific Conductivity
NT1201 207 226.7 12.1 44.9 10.898 0.0325 0.28 0.03 0.004 0.005 0.0338 0.005 0.0425 14.5 1271 86966 8.22 375.75
NT1202 293 146.5 9.2 33.1 16.675 0.0323 0.206 0.03 0.003 0.004 0.037 0.004 0.039 5.33 1948 109476 8.05 409

Key:
< or > - Amount detected is above or below equipment detection limit A - Approximate end time of flow due to power failure A-01 - >400000
B-02 - BOD result calculated from COD analysis D-1 - Elevated reporting limit(s) due to dilution. This has no effect on the data. Sample result is considered valid. DET - Analyte Detected
DRY – Sample results reported on a dry weight basis E - End time of flow due to equipment removal from site IS - Insufficient Sediment within Sample
J - Detected but below the reporting limit N/A - Data not available at this time ND - Analyte not detected at or above the reporting limit
NR - Not Reported NST – No Sample Taken U - Undetected
W-05 - Highest possible dilutions were made by the laboratory Qual – Qualifiers Q-5 - Seed correction outside desired limits. This has no effect on the data. Sample result is considered valid.
Q11 - Insufficient sample for analysis of matrix spike. This has no effect on the data. Sample result is considered valid. RPD - Relative Percent Difference S-1 - Laboratory container pH was above desired amount. This has no effect on the data. Sample result is considered valid.
TNTC - Too numerous to count U – Undetected W-05 - Highest possible dilutions were made by the laboratory
     
BOD - Biochemical Oxygen Demand BRL - Below Reading Limit COD - Chemical Oxygen Demand
TDS - Total Dissolved Solids TSS - Total Suspended Solids by EPA 160.2 PC - Sample results suspect due to post-calibration results
**This data was only collected in the second permit term. ***This data is only being collected in the third permit term.  


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