Water Quality Report


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Harbison Walker Phase I Water Quality Report - 12/13 Raw

Export Sample Point Report  /  Inflow: No / Outflow: No
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-03-01------3.58------1492--0326.24172.5--22.25--0.74--1353.34--
1999-10-15------5.6------1460--8394215--27.1--0.6--1100--
1999-10-18------5.1------1440--4401212--26.4--0.7--110012--
1999-10-20------3.9------1570--0409218--29--1.3--11000--
1999-11-09----4.73.12----111739--0270.48162.75--26.3--3.4--1166.715--
1999-11-19----4.93.78----111625--0367.08160.5--26.05--0.65--851.85--
Minimum:----4.73.12----111440--0270.48160.5--22.25--0.6--1100--
Maximum:----4.95.6----111739--8409218--29--3.4--1353.315--
Average:----4.804.18----11.01,554--2361.30190.13--26.18--1.23--947.06.0--
Range:----0.22.48----0299--8138.5257.5--6.75--2.8--1243.315--
Median:----4.83.84----111531--0380.54192.25--26.35--0.72--11004.5--
Loading (lb/day):------------------

Sample Point Description: Abandoned Mine Discharge; Assumed Influent to ALD; Sampling conducted prior to installation of passive system

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.


Harbison Walker Phase I Water Quality Report - ALD

Export Sample Point Report  /  Inflow: Yes / Outflow: No
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-11-19Bucket106.76.2----101660--111.14114.66146.75--21.1--0.12--1607.852--
1999-12-17------6.2----------128182184--23.4--0--958.680--
2000-01-17----76.17----91607--75.13195.3146.75115.2520.7520.1500864.138--
2000-01-25Assumed10--6.3----------142198186--22.7--0--984104.1--
2000-03-30Bucket116.65.38----101391--13.7191.84148.75139.2518.518.45001108.868--
2000-04-28Bucket116.46.2----101438--76.92195.286.663.917.6516.350.050744.418--
2000-06-08Bucket126.35.91----131501--48.41211.15172--18.25--0.04--787.563--
2000-09-07Bucket10.816.46.09----131474--172.45162.59173.75164.7519.217.70.090.0688922--
2000-10-24Bucket11.56.76.2----111532--99.55181.97175.75146.7519.518.750.070.0499536--
2000-12-15Bucket11.986.76.21--091530--90.47242.18155.75144.2518.518.40.040.04884.65--
2001-01-23Bucket9.656.66.22----91502--78.78205.03180.25174.2520.620.50.170.08867.516--
2001-05-29Bucket126.56.21----111436--82.06182.91135.7513219.1517.650.070816.910--
2001-09-21Bucket86.75.8----141372--16.07178.613468.518.3518.10.050882.647--
2004-09-23Bucket206.36----------68.8173.4158--17.8--0.25--786.294--
2004-10-27Bucket106.716.2----11----86.4205.2143--16.6--0.25--736.376--
2004-11-28Bucket106.556.2----10----114.8179.4156--19.7--0.25--739.858--
2004-12-16Bucket126.576.2----9----111200.8146--17.2--0.25--935.924--
2009-10-20--106.455.9400.0612.1147517852.78169.04174--24.19--0.04--988.3112--
2010-04-29--116.505.51----10.01409182.020.86163.28193.00--20.72--0.04--867.4104--
2012-06-05Bucket116.295.74-130.2012.8137816044.39149.45172--27.15--<0.04--916.7110--
2015-06-04--86.255.42----10140616927.43147.29146--19.88--<0.10--724.539--
2018-08-25--116.75.62----13130015345.7799.1112.01108.3714.6113.91<0.10<0.1079159--
Minimum:086.255.38-1309130015313.799.186.663.914.6113.9100724.55--
Maximum:02076.300.20141660182.0172.45242.18193.00174.2527.1520.50.250.081607.8112--
Average:0116.556.00-70.0910.91,463168.4078178.56155.73125.7319.8018.000.090.02903.556.1--
Range:--120.750.92130.2536029158.75143.08106.4110.3512.546.590.250.08883.3107--
Median:--116.566.19-6.50.0610145616977.85181.99155.88135.6319.3518.250.050875.0555--
Loading (lb/day):5.1510.0823.6820.587.472.581.030.010

Sample Point Description: Effluent of Anoxic Limestone Drain; Flows into Settling Pond 1; Receives influent as mine discharge

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.


Harbison Walker Phase I Water Quality Report - SP1

Export Sample Point Report  /  Inflow: No / Outflow: No
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-12-10----63.18------1497--0216.382.25--18.8--0.51--980.939--
1999-12-17------5.8----------2818497.8--21.6--0--955.128--
2000-01-17----65.85----31478--16.0922984.979.821.421.05001033.515--
2000-01-25------6----------46214122--23.9--0--85410--
2000-03-30Assumed116.24.88----111286--2.14207.0681.2576.518.218.200929.129--
2000-04-28Assumed1164.74----131276--1.56192.168.46617.1516.80.0507633--
2000-06-08Assumed125.73.78----171362--0181.4370.75--17.05--0.09--707.937--
2000-09-07Assumed10.815.85.16----1513.03--48.84192.3788.582.2519.6516.850.070851.211--
2000-10-24Assumed11.55.85.61----111360--8.25208.991.7585.519.1517.80.060905.76--
2000-12-15Assumed11.9865.91--051400--20.81238.9198.2587.7518.5518.150.060823.53--
2001-01-23Assumed9.655.96.04----51355--49.19222.29155.5137.7519.6518.950010109--
2001-05-29Assumed1265.25----201275--3.71197.5872.568.2518.1517.250.220726.32--
2001-09-21----4.74.08----161285--0199.2686518.4517.550.150815.22--
2009-10-20--105.254.972339.311.8138221.88201.298.26--22.37--0.04--882.96--
2010-04-29--114.504.11----16.0133000198.0294.11--19.64--0.04--809.74--
2012-06-05----5.155.11607.8316.8122053.12162.3887.08--22.16--<0.04--867.3<5--
2015-06-04----4.753.24----17148300142.3975.48--19.64--0.16--682.129--
2018-08-25----5.64.41----231184170146.2761.260.5114.5414.1<0.10<0.10666.914--
Minimum:09.654.503.181600313.030.00142.3961.260.5114.5414.100666.92--
Maximum:0126.26.042339.32314971749.19238.91155.5137.7523.921.050.5101033.539--
Average:0115.584.901975.7113.41,2624.8013196.3088.7880.9319.4517.670.090848.014.5--
Range:--2.351.72.86739.3201483.971749.1996.5294.377.249.366.950.510366.637--
Median:--115.85.04196.57.83151342.522.63198.6185.9978.1519.417.680.060852.610--
Loading (lb/day):0.021.7427.1912.117.982.521.660.010

Sample Point Description: Effluent of Settling Pond 1; Flows into Vertical Flow Pond; Receives influent from ALD

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.


Harbison Walker Phase I Water Quality Report - VFP

Export Sample Point Report  /  Inflow: No / Outflow: No
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-12-10----7.57.1------1575--150.6509.5--9.7--0.27--1232.430--
1999-12-17------6.8----------134013.6--12.9--0--935.20--
2000-01-17----76.63----41490--89.18022.514.919.8518.85001058.535--
2000-01-25------6.6----------136030.9--25.5--0--90516--
2000-03-30Assumed116.86.98----91272--104.7906.535.0614.7514.700978.731--
2000-04-28Assumed116.86.89----141249--101.9705.52.4114.713.60.120620.44--
2000-06-08Assumed126.87.01----181215--103.0201.9--15.35--0.07--526.86--
2000-09-07Assumed10.816.86.77----201248--116.16014.7514.617.714.150.090722.617--
2000-10-24Assumed11.576.62----131306--65.6019.819.4517.3516.150.110.05816.315--
2000-12-15Assumed11.9876.48----31416--79.6522.744029.3519.0516.40.080.06899.923--
2001-01-23Assumed9.656.76.51----21370--92.9727.6171.2569.520.0519.500942.514--
2001-05-29Assumed126.96.47----171275--51.82020.2519.615.8515.150.230.06726.34--
2001-09-21----6.920--------------19.317.4517.516.80.350.21------
2009-10-20--106.636.45241.179.913655550.421.510.34--20.37--0.04--836.311--
2010-04-29--116.406.50----13.5132120.053.902.7016.96--17.31--0.04--801.81--
2012-06-05Bucket86.516.23-351.2420.613035844.4828.8622.64--17.95--<0.04--873.58--
2015-06-04----6.55.48----181364299.6321.2219.2--18.46--0.38--766.918--
2018-08-25--116.75.12----221154323.5922.0916.4815.8112.7112.36<0.10<0.10609.624--
Minimum:086.405.12-351.172115420.03.5900.342.419.712.3600526.80--
Maximum:0127.520241.2422157558150.6528.8671.2569.525.519.50.380.211232.435--
Average:0116.817.26-61.2113.11,32838.80828.6319.5220.8117.0615.770.110.04838.415.1--
Range:--41.114.88590.072042138147.0628.8670.9167.0915.87.140.380.21705.635--
Median:--116.86.61-5.51.2113.7513063289.18018.0816.6317.4315.650.080836.315--
Loading (lb/day):1.599.51.262.511.92.191.350.010

Sample Point Description: Effluent of vertical flow pond; Flows into Settling Pond 2; Receives influent from SP1

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.


Harbison Walker Phase I Water Quality Report - SP2

Export Sample Point Report  /  Inflow: No / Outflow: No
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-12-17------6.9----------14609.5--10.3--0--8350--
2000-01-17----76.67----31490--93.49018.63.8118.417.60.090920.623--
2000-01-25------6.6----------138026.6--23.5--0--9627.9--
2000-03-30Assumed117.67.67----121216--101.5104.10.291413.950.230916.716--
2000-04-28Assumed117.47.41----151242--106.1502.32--13.05--0.09--694.83--
2000-06-08Assumed127.77.22----191266--98.0201.65--16--0.1--548.57--
2000-10-24Assumed11.56.86.82----121330--59.7404.10.821611.650.060898.21--
2000-12-15Assumed11.9866.21----21280--40.791.224.312.321.4515.90.050701.35--
2001-01-23Assumed9.656.15.43----11296--12.1711.5730.122.8518.718.40.04080016--
2001-09-21----7.27.34----191264--76.9202.570.214.7514.750.120.05643.14--
2009-10-20--106.686.481917.7611.512762521.886.432.72--15.9--0.04--744.25--
2010-04-29--116.706.60----17.012669.027.86-18.512.83--19.66--0.04--691.63--
2012-06-05----6.636.15837.5818.812162729.516.975.45--20.72--<0.04--787.16--
2015-06-04----65.23----18134023.478.773.51--18.17--<0.10--766.99--
2018-08-25----5.95.64----221130135.1217.714.632.2912.7712.4<0.10<0.10577.55--
Minimum:09.655.95.23837.581113023.47-18.511.650.210.311.6500548.50--
Maximum:0127.77.671917.762214902714617.7130.122.8523.518.40.230.0596223--
Average:0116.756.561377.6713.11,27815.20642.288.204.6516.8914.950.070.01765.87.4--
Range:--2.351.82.441080.182136025142.5336.2228.4522.6513.26.750.230.05413.523--
Median:--116.76.61377.671512661359.7404.12.291614.750.060766.95--
Loading (lb/day):0.527.93-0.020.810.392.230.980.010

Sample Point Description: Effluent of Settling Pond 2; Flows into Wetland; Recieves influent from VFP

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.


Harbison Walker Phase I Water Quality Report - WL

Export Sample Point Report  /  Inflow: No / Outflow: No
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-12-17------7.2----------19606.9--9.1--0--1071.34--
2000-01-17----7.26.81----21717--128.35013.451.619.219.050.1101089.912--
2000-01-25------6.6----------134021.3--23.4--0----871--
2000-03-30Assumed117.87.94----151187--112.6602.450.0512.311.950.110735.912--
2000-04-28Assumed117.67.34----19.51236--138.9400.78--8.02--0.16--682.49--
2000-06-08Assumed127.47.14----141292--134.5501.54--13.8--0.14--53410--
2000-09-07Assumed10.817.37.35----201296--161.8100.730.1517.0516.20.130.05760.47--
2000-10-24Assumed11.577.07--8121309--65.2600.470.1115.2514.70.150935.52--
2000-12-15Assumed11.986.36.38--721392--45.792.445.812.2715.615.050.120.08861.77--
2001-01-23Assumed9.655.95.67--501264--17.0810.5617.211.519.3518.850.090852.512--
2001-05-29Assumed126.76.79----201211--40.9100.330.078.678.330.220.04609.81--
2001-09-21----6.86.74----171180--49.0700.510.062.492.480.090.04664.33--
2009-10-20--107.036.451707.3614.712332220.77-2.810.34--12.26--0.04--786.34--
2010-04-29--117.306.51----20.0125214.019.22-11.440.36--13.68--0.04--683.6<1--
2012-06-05--87.136.46993.8417.312104740.91-26.071.11--18.33--<0.04--731.5<5--
2015-06-04----6.56.6----1713282222.96-12.650.6--21.51--<0.101--724.5<5--
2018-08-25----6.96.04----251101123.5515.320.32<0.108.718.61<0.10<0.10559.2<5--
Minimum:085.95.67993.8401101123.55-26.070.320.052.492.48005341--
Maximum:0127.87.9417082517174719615.3221.311.523.419.050.220.081089.9871--
Average:0116.996.771356.2414.41,28123.4078-1.454.361.9814.0412.800.100.03767.773.4--
Range:--41.92.27714.162561635192.4541.3920.9811.4520.9116.570.220.08555.9870--
Median:--117.036.74134.571712522249.0700.780.1313.814.70.110.02733.77--
Loading (lb/day):0.829.65-0.250.350.161.81.020.010

Sample Point Description: Effluent of wetland; Flows into Horizontal Flow Limestone Bed; Receives influent from Settling Pond 2

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.


Harbison Walker Phase I Water Quality Report - HFLB

Export Sample Point Report  /  Inflow: No / Outflow: Yes
Date
Method of Flow
Flow - Field (gal/min)
pH - Field (S.U.)
pH - Lab (S.U.)
ORP - Field (mvolts)
DO - Field (mg/L)
Temp - Field (C)
Cond - Lab (umhos/cm)
Alkalinity - Field (mg/L)
Alkalinity - Lab (mg/L)
Acidity - Lab (mg/L)
T. Fe - Lab (mg/L)
D. Fe - Lab (mg/L)
T. Mn - Lab (mg/L)
D. Mn - Lab (mg/L)
T. Al - Lab (mg/L)
D. Al - Lab (mg/L)
SO4 - Lab (mg/L)
TSS - Lab (mg/L)
Ferrous Iron (Mg/L) Lab
1999-12-10----7.57.27------1723--173.5801.9--2.66--0.27--1244.77--
1999-12-17------7.2----------16404.9--7.3--0--784.50--
2000-01-17----77.1----21573--135.6303.950.6415.815.950.070958.214--
2000-01-25Estimated1076.7----------14403.3--21.5--0--113.94--
2000-03-30Assumed117.47.59----181173--115.701.070.051110.9007267--
2000-04-28Assumed117.67.52----231198--125.701.20.074.253.680.160.11563.113--
2000-06-08Assumed127.57.15----181219--121.0704.03--11.55--0.07--512.33--
2000-09-07Assumed10.817.27.12----181291--142.8100.980.278.468.240.150.12722.69--
2000-10-24Assumed11.57.37.14--2131349--89.0700.90.841.841.70.860.148614--
2000-12-15Assumed11.986.86.82--221281--98.1502.231.344.794.750.10.08617.31--
2001-01-23Assumed9.656.56.64--111346--116.6203.952.9820.1519.50.090.04762.59--
2001-05-29Assumed1277.04----171221--75.4901.111.011.871.770.20.05609.83--
2001-09-21----7.37.28----181163--82.3601.841.352.272.220.040616.41--
2004-09-23----7.37.1----------83-451.87--4.35--0.25--618.312--
2004-10-27----7.047.2----12----82.6-63.22.06--2.22--0.25--606.66--
2004-11-28----7.137.3----6----80-45.82.08--1.29--0.25--578.11.5--
2004-12-16----7.147----2----73-421.45--0.716--0.25--6611.5--
2009-10-20--107.346.241936.2913.111871813.64-1.210.09--6.89--0.04--734.54--
2010-04-29--116.906.46----16.5121711.033.91-10.820.30--6.75--0.04--654.21--
2012-06-05--87.266.431506.4817.911653034.43-23.880.23--11.16--<0.04--669.86--
2015-06-04--86.55.73----191322237.045.920.33--18.08--0.1--682.17--
2018-08-25--116.56.36----231174158.74-0.60.120.128.868.55<0.10<0.10531.7<5--
Minimum:086.55.7315011116311.07.04-63.20.090.050.7161.700113.90--
Maximum:0127.67.591936.4823172330173.585.924.92.9821.519.50.860.141244.714--
Average:0117.116.931723.5513.31,28819.4091-10.301.810.877.907.730.160.06674.05.4--
Range:--41.11.86435.482256019166.5469.124.812.9320.78417.80.860.141130.814--
Median:--117.147.1171.5216.7512201886.0401.650.746.826.50.10.05657.64--
Loading (lb/day):0.7610.53-0.240.180.061.190.540.020.01

Sample Point Description: Final Effluent of Harbison Walker Phase 1 passive treatment system; Effluent of Horizontal Flow Limestone Bed; Receives flow from wetland

  1. Records with no value are not included in statistical calculations.
  2. Values lower than the minimum detection limit are assumed to be 0.
  3. Average pH is calculated using the arithmetic mean of pH values. Hydronium ion concentrations were not used.
  4. This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike License.

To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.