5 –Day Lagoon Seepage Testing Case Studies Electronic ... PNCWA... · 0.001 ft. to determine...
Transcript of 5 –Day Lagoon Seepage Testing Case Studies Electronic ... PNCWA... · 0.001 ft. to determine...
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5 –Day Lagoon Seepage TestingCase Studies
Electronic Measurements and Recording
Brett M. Converse Ph.D., [email protected]@jub.com
J-U-B ENGINEERS, Inc.
Sandpoint, ID
(208) 265 72812009 Annual PNCWA ConferenceBoise, IdahoSeptember 13-16
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Electronic Measurements and Recording
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Helpful Spreadsheet
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http://www.deq.state.id.us/water/assist_business/engineers/guidance.cfm
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Electronic Measurements and Recording
• 5.5.2 Procedures for using mechanical or electronic measurements and recording for a minimum 5 day test
• Part 4 (5.5.2-4)• Liquid surface measuring equipment to measure lagoon surface
elevation and evaporation pan surface elevation. In most cases, the elevation and evaporation pan surface elevation. In most cases, the equipment to measure these two parameters must be accurate to 0.001 ft. to determine compliance with the rule. Such equipment includes ultrasonic equipment, pressure transducers, and float-operated equipment, each having associated electronic or mechanical recorders to log the data. When using equipment that may be affected by barometric pressure, these effects must be taken into account
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Accurate to 0.001 ft.
• 0.001 ft• 0.012 inches• Find equipment that has a full scale accuracy of ± 0.1%• Operating range of 12 inches Maximum
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Equipment
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Equipment
• Precipitation gauge• Air temperature sensor • Air temperature sensor• Water temperature sensor• Wind Speed and Direction sensors• Liquid level sensor (2) – GeoKon, vibrating wire force transducer for • Liquid level sensor (2) – GeoKon, vibrating wire force transducer for
water level monitoring with a full scale sensor range from 0 to 6 inches and an accuracy of ±0.1% of full scale.
• Power supply – 12 V battery.• Galvanized steel instrumentation tripod.• Data logger• Class A evaporation pan with pan stilling well
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Case Study OneWet Well Lagoon
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Case Study OneWet Well Lagoon
Maximum Approximate Area
LinedMaximum OperatingDepth (ft)
Approximate Volume (gallons)
Area (acres)
Yes 3.5 25,000 0.057
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Lagoon Seepage Test First Hours
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Lesson Learned
• Prior to arriving on site have operators– Isolate lagoon for a few days– If the lagoon liquid level is dropping
• More than about 1 inch per day – leaking• Very little – better chance of not leaking
• Problems (two sites)• Problems (two sites)– Open valve on the pump cooling jacket line.
• Closed valve, filled lagoon, restarted test
– Isolation gates did not seal• Could not fix leak quickly, job postponed.
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Lagoon and E-pan Liquid Level
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E-pan Liquid Level
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E-pan and Rain
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E-pan and Temperature
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Lagoon Liquid Level
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Wind Scatter
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Wind Scatter
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Lagoon Liquid Level and Rain
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Log Data Every 4 Minutes
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4-Hour Time Step Data Averaged
Averaged
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4-Hour Time Step 20 Points Averaged (80 Minutes)
Averaged
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DEQ Spreadsheet
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DEQ Spreadsheet
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Result – From DEQ Spreadsheet
Hour Period Sr1 Sr1
Equipment Error
Sr1 Sampling Error
Worst Case
Best Case
in/day +/- in/day +/- in/day in/day in/day 1-24 0.054 0.011 0.0380 0.0645 0.0428 25-48 -0.018 0.010 0.0773 -0.0070 -0.0280 49-72 -0.049 0.010 0.0741 -0.0387 -0.0592 49-72 -0.049 0.010 0.0741 -0.0387 -0.0592 73-96 0.000 0.011 0.0592 0.0108 -0.0103 97-120 0.034 0.010 0.0572 0.0446 0.0236
Total Day 5 -0.0015 0.0105 0.0090 -0.0121 Average 0.0043 0.0105 0.0269 0.0417 -0.0331
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Case Study Two4-Cell Lagoon Wastewater Treatment
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Depth (ft)Volume (gallons)
Area (acres)
Case Study Two
(gallons)
Pond 1 7 2,156,000 1.03
Pond 2 3.33 3,344,000 2.827
Pond 3 3.75 964,000 1.013
Pond 4 3.75 982,000 0.979
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Issues
• The lagoons are treating flows near capacity• Fear of permit violations• Lagoons can not be isolated• Lagoons can not be taken off line• Lagoon 1 will continue aeration• Lagoon 1 will continue aeration
• Therefore• Seepage test all four lagoons at the same time while on
line
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Risk
• Explain risks associated with on-line and multi cell test• Might not pass and not know if one lagoon was leaking a
lot or all of them a bit• Not pass due to issues other than leaking (test
equipment not able to resolve flow issues)• Lagoon would have to operate consistently throughout
test• Other unknowns
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Client Willing to Take Risk
• Forged ahead with a plan• Submitted seepage testing procedure to DEQ for
approval• Install inlet and outlet flow meters• Received DEQ approval of procedure• Received DEQ approval of procedure• Set up equipment and began collecting data
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First 8 Days
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First 8 Days
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First 8 Days
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First 8 Days
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Now What
• Learned the procedure is risky• Averaging period near peak with scatter• Collect more data to allow a longer averaging period
• Flow meter partially plug on the 7th and not operational until the 10th.
• Cleared obstruction from Weir (pond 3 and 4)
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Another 20 Days
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20 Days
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20 Days
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Another 20 Days
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20 Days
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13 day Sub Set
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13 Day Sub Set
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13 Day Sub Set
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96 Hour Averaging Period
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96 Hour Averaging Period
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Raw Data
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Math – Error Propagation
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Math
Seepage/timeAve of 6 4-hr time steps Fully Propagated Error
STDEV(6,4-hr)/ Count
Uses End Result
Average of 4-hr Time Step