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American Water Works Association California-Nevada Section Operator’s Symposium Ontario, California March 17, 2015 Lawrence H. Ernst, PG, CEG, CHG Russell J. Kyle, MS, PG, CHG Wood Rodgers, Inc.

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  • American Water Works AssociationCalifornia-Nevada SectionOperators SymposiumOntario, CaliforniaMarch 17, 2015

    Lawrence H. Ernst, PG, CEG, CHGRussell J. Kyle, MS, PG, CHG

    Wood Rodgers, Inc.

  • Introduction Well rehabilitation can cause damage

    Every action has a reaction, not all are favorable Well casings have a limited tolerance to mechanical and

    chemical treatments Cost benefit and risk analysis should be prepared prior to

    starting a program Programs are dynamic and require monitoring to help

    ensure you dont do damage or waste money on treatments that are not working

    One size does not fit all Make sure your program addresses the objectives and the

    current condition of the well

  • 1. Why Rehabilitate?2. Data Collection and Review3. Detailed Well Assessments4. Well Field Rehabilitation Prioritization5. Well Rehabilitation Programs

  • Why Rehabilitate? Loss of well yield Reduced well efficiency Increased power costs Sand production Water quality degradation

  • Repair vs. Replace In the long run, a good new well will last longer

    and be more reliable than a repaired well. So why repair? Timing repairs are quicker Cost repairs can be much less expensive. Permitting repairs work with the existing permitted

    source, but replacement wells require a permit amendment

    Land Availability existing site may not be large enough to accommodate an new well

  • Repair or Replace

    Sand Production Water Quality Problem Decline in Yield

    Catastrophic Failure

    Could Rehabilitate, Repairor Replace Depending

    on Circumstances

    Replacement is Usuallythe Only Option

  • Reasons for Loss of Well Yield Well Problem Pump Problem Changes in Groundwater Basin Conditions How do you determine the reasons?

  • What Causes Loss of Yield? Clogging

    Bacterial activity Mineral encrustation Corrosion byproducts

    Failed pumping equipment components (worn impellers, holes in column pipe)

    Well interference Regional water level decline Water level below screen (reduced saturated thickness) Pumping plant deficiencies

  • Clogged Louvers from Precipitation of Minerals

  • Biofouling

  • Severely Clogged

    Wire-Wrap Screen

  • Pump Column Pipe with Severe

    Encrustation

  • Chemical Precipitation

  • Heavily Corroded Pump Column

    Pipe Connection

  • Severely Corroded Pump

    Column Pipe

  • Jetting Water from Pump

    Column into Vent

  • 1.2. Data Collection and Review3.4.5.

  • Data Collection Data is key in deciding when and how to rehabilitate Often, reliable data is not available Reinforce the need for good record keeping Utilize routine testing programs Consistent monitoring procedures, protocols, and

    analysis Identify tools available

  • Data Collection Compile Existing Data

    Well construction data Drillers logs Downhole video surveys

    Groundwater levels Static Pumping

    Specific capacity Pumping test data Water quality records Sand production records Operational concerns Flowmeter surveys CITM surveys (casing thickness) Records from previous rehabilitation events

  • Well Construction Data

  • Well Construction DataWell Data Construction Date Sanitary Seal Depth Annular Seal Depth Well Depth Screen Intervals Screen Type

    (i.e. pattern and slot size) Casing Materials Accessory Pipes

    (sounding pipe, gravel fill pipe) Gravel Envelope Material Modifications (liner, patches, etc.)

  • Static Groundwater Levels Static groundwater levels reflect the depth to

    groundwater under non-pumping conditions Measures depth to water in well structure (aquifer) Can be converted to reflect the elevation of the water

    table in an unconfined aquifer, or the potentiometric head of a confined aquifer, relative to mean sea level

    Plot Data on Hydrographs Observe seasonal and long-term trends Observe spatial trends (local pumping depressions, etc.)

  • -60

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    1940 1950 1960 1970 1980 1990 2000 2010

    Gro

    undw

    ater

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    NG

    VD 2

    9

    Date

    Ground Surface Elevation - 43 Feet MSL

    Regional Groundwater Level Decline

    Regional Groundwater Level Recovery

    Static Groundwater Levels

    Onset of Conjunctive Use (late 1970s)

  • Pumping Water Levels Measure the depth to groundwater while the well is

    pumping at specific flow rate(s) Allows for tracking of specific capacity over time Plot Data on Hydrographs Observe changes in pumping water level over time

    Declining yield, stable PWLs and SWLs may indicate decreased plant efficiency (not a well issue)

    Declining yield and SWLs may indicate decreased yield due to regional groundwater level decline (not a well issue)

    Declining yield and PWLs may indicate decreased well efficiency due to clogging (well issue)

  • -60

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    1940 1950 1960 1970 1980 1990 2000 2010

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    NG

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    Date

    Ground Surface Elevation - 43 Feet MSL

    Pumping Groundwater Levels

    Top of Screen

    Water Levels Below Top of Screen Can Lead to Entrained Air and Loss

    of Saturated Aquifer Thickness

  • Groundwater Levels Tools to Measure Water Levels

    Electric sounder Air line Pressure transducer

    Measurement Protocols Water levels must be recovered (static) Measure from same reference point

    every time Frequency of Measurements

    As needed to identify seasonal trends Minimum spring and fall

    measurements

  • Specific Capacity Specific capacity (Q/s) defines the relationship between

    drawdown in the well and its discharge rate. gallons per minute per foot (gpm/foot) of drawdown

    Decreases in specific capacity values will result in deeper pumping water levels, resulting in higher energy costs to pump.

    Comparison of multiple specific capacity data points can indicate how well the well is operating.

    Specific capacity varies with both time and flow rate. Pumping water levels can be plotted on a semi-logarithmic

    chart and projected to a specific time interval (i.e. 24-hours) for comparison purposes

  • Calculation of Specific Capacity(Q/s)

    Q = flow rate (use totalizing flowmeter)s = drawdown (pumping water level minus the static water

    level) normalize to set time (24 hrs)

    ExampleQ = 1,793 gpmStatic water level = 114.07 feet24-hour projected pumping water level = 160.3 feetQ/s = 1,793 gpm / (160.3 ft 114.07 ft) = 39 gpm/ft

  • Pumping Test DataProvide good information regarding current

    and/or historical pumping dynamicsAssess data from prior pumping testsPerform step test prior to rehabilitation to

    serve as baseline well efficiencyPerform step test post rehabilitation to

    assess results

  • Step Drawdown Test Testing the well at multiple flow rates for a

    constant time period (one to three hours) Normalize to set time (e.g., 24 hrs) Use to Calculate well efficiency

    Well efficiency relates to the ratio between the theoretical drawdown of the aquifer to the actual drawdown inside the well structure

  • 125

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    Elapsed Time (Minutes)

    City Of Roseville Well W-77(9/25/2006)

    Transducer Data Hand Data

    SWL = 113.8 FT

    1242 GPM TestQ/s = 40 GPM/FT

    1800 GPM TestQ/s = 41 GPM/FT

    2392 GPM TestQ/s = 40 GPM/FT

    24 hours

    1242 GPM

    1800 GPM

    2392 GPM

    Step Drawdown Test

    PW-77 Trans Check

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    159.42160.5

    159.53160.5

    159.46160.7

    159.5160.7

    159.59160.6

    159.53160.6

    159.59160.5

    159.55160.6

    159.48160.6

    159.53160.5

    159.58160.8

    159.49160.5

    159.4160.5

    159.54160.5

    159.52160.7

    159.59160.6

    159.52160.7

    159.48160.6

    159.52160.6

    159.59160.6

    159.59160.5

    159.47160.79

    159.58160.69

    159.35160.59

    159.49160.59

    159.56160.49

    159.64160.59

    159.48160.59

    159.48160.49

    159.62160.69

    159.58160.59

    159.52160.69

    159.45160.49

    159.62160.59

    159.68160.69

    159.68160.59

    159.58160.49

    159.56160.59

    159.62160.59

    159.72160.49

    159.56160.49

    159.59160.5

    159.67160.6

    159.42160.7

    159.63160.6

    159.57160.6

    159.66160.7

    159.54160.5

    159.45160.6

    159.44160.6

    159.5160.6

    159.53160.5

    159.5160.7

    159.49160.5

    159.5160.6

    159.7160.7

    159.53160.8

    159.46160.6

    159.61160.7

    159.69160.6

    159.69160.5

    159.67160.7

    159.65160.6

    159.61160.7

    159.57160.6

    159.73160.4

    159.63160.6

    159.55160.5

    159.54160.5

    159.61160.7

    159.71160.6

    159.52160.7

    159.65160.6

    159.59160.7

    159.67160.7

    159.63160.6

    159.54160.7

    159.53160.7

    159.78160.7

    159.65160.6

    159.61160.7

    159.61160.7

    159.59160.8

    159.45160.8

    159.74160.7

    159.76160.6

    159.46160.6

    159.62160.8

    159.73160.6

    159.69160.9

    159.59160.8

    159.73160.7

    159.7160.9

    159.71160.7

    159.45160.7

    159.59160.6

    159.7160.6

    159.73160.7

    159.75160.7

    159.73160.5

    159.78160.7

    159.66160.61

    159.74160.71

    159.74160.71

    159.7160.51

    159.63160.71

    159.71160.71

    159.58160.81

    159.71160.71

    159.67160.51

    159.81160.71

    159.76160.7

    159.69160.8

    159.84160.8

    159.75160.8

    159.74160.8

    159.78160.7

    159.71160.8

    159.76160.9

    159.65160.7

    159.78160.8

    159.69160.8

    159.79160.8

    159.73160.8

    159.73160.8

    159.71160.7

    159.78160.8

    159.74160.7

    159.83160.8

    159.84160.7

    159.78160.7

    159.79160.81

    159.79160.81

    159.7160.81

    159.85160.81

    159.67160.81

    159.75160.51

    159.74160.81

    159.76160.81

    159.7160.91

    159.84160.61

    159.84160.81

    159.66160.81

    159.84160.81

    159.72160.91

    159.79160.81

    159.85160.91

    159.87160.81

    159.91160.91

    159.74160.81

    159.76160.81

    159.75160.71

    159.64160.81

    159.77160.61

    159.7160.81

    159.72160.71

    159.71160.91

    159.72160.71

    159.95160.91

    159.81160.81

    159.87160.81

    159.79160.91

    159.72160.81

    159.79160.91

    159.68160.81

    159.8160.91

    159.72160.81

    159.71160.81

    159.75161.11

    159.79160.81

    159.84160.71

    159.88160.71

    159.8160.81

    159.97160.81

    159.83160.71

    160.04160.51

    159.96160.91

    159.88160.91

    159.79160.81

    159.79160.81

    159.62160.81

    159.81160.81

    159.72160.81

    159.7160.81

    159.71160.81

    159.68160.81

    159.85160.71

    159.87160.81

    159.83160.81

    159.92160.81

    159.71160.91

    159.86160.82

    159.84160.82

    159.84160.82

    160.02160.92

    159.94160.92

    159.94160.82

    159.89160.82

    159.89160.92

    159.88160.82

    159.86160.92

    159.77160.81

    159.87160.81

    159.71160.81

    159.79160.81

    159.88160.81

    159.96160.81

    159.81160.81

    159.96160.81

    159.87160.91

    159.84160.81

    159.78160.82

    159.88160.92

    159.96160.92

    159.89160.82

    159.8160.82

    159.93160.92

    159.82161.02

    159.92160.92

    159.96160.82

    159.92160.92

    159.91160.83

    160.02160.93

    159.9160.93

    159.9160.83

    159.86160.93

    159.94160.93

    159.76160.83

    159.94160.83

    159.89160.93

    159.85161.23

    159.96160.72

    159.8161.02

    159.89160.82

    159.86160.92

    159.9161.02

    159.96160.72

    159.77160.92

    160.03160.92

    159.88161.02

    159.97160.82

    159.83160.93

    159.99161.03

    159.99160.83

    159.89160.93

    159.93160.93

    159.95160.93

    159.95160.93

    159.95160.93

    159.99160.83

    159.87160.93

    159.95160.93

    159.94160.83

    160160.83

    159.93161.03

    159.85160.93

    159.87161.03

    159.97160.93

    159.94160.93

    160.1160.83

    159.93160.73

    159.95161.14

    159.92161.04

    159.92160.94

    160.04160.74

    159.88161.14

    159.91160.84

    160.03161.04

    159.87160.94

    159.9161.04

    159.77160.94

    159.96161.04

    159.98161.04

    159.98161.04

    159.87161.24

    160.08160.94

    159.91160.94

    159.9161.04

    159.99160.94

    159.92161.04

    160.08160.84

    159.93160.83

    159.95161.03

    159.87161.03

    160.03161.03

    159.91161.03

    160.03160.93

    159.86161.03

    160161.03

    159.97160.93

    160.02161.03

    159.96161.14

    159.94161.04

    159.83160.94

    159.98160.84

    159.98161.04

    160161.14

    159.95160.94

    160.01160.94

    159.92161.04

    160.04160.94

    160.05161.04

    159.98161.04

    160.07160.94

    159.94160.64

    160.03161.04

    159.98160.94

    159.98160.94

    159.99160.95

    160.02161.05

    159.95161.15

    159.96161.15

    160.02160.95

    159.99161.16

    160.06161.16

    160.11161.06

    159.86161.06

    160.07161.16

    160.09161.16

    160.15161.06

    160.1161.16

    160.05161.16

    160.14160.96

    160.05161.06

    160.06161.16

    160.06161.26

    160.06161.06

    160.02160.96

    159.98161.06

    160.05160.96

    160160.96

    160.03161.07

    160.1161.17

    160.08161.27

    160.03160.87

    160.04161.17

    160.12161.17

    160.01160.97

    160.03161.07

    160.18161.27

    160.08161.17

    160.14160.86

    160.1161.16

    160.24160.96

    159.94161.06

    160.03161.06

    160.03160.86

    159.93161.16

    160.11161.06

    160.06161.16

    160.13161.16

    160.19161.16

    160.09160.96

    160161.16

    160.17161.06

    160.13161.06

    160.14161.06

    160.17161.16

    160.1161.16

    160.06161.16

    160.07161.16

    160.06161.06

    160161.16

    160.02161.16

    160.19161.16

    160.05161.06

    160.1161.06

    PW-77 30m

    PW-77 100m

    Hand Data

    PW-77 30m step

    PW-77 100m step

    PW-77 hand step

    Time

    Depth to Water (Feet)

    Comparison of Transducer and Hand MeasurementsCity of Roseville W-77 Aquifer Testing

    Short-term Pump Test W-77

    161.79168.1125138.35138.2145.18153.15

    168.2169185138.83139.5152.99154.46

    169.61169.1139.46140154.35154.56

    168.86169.25140.01140.3154.84154.77

    169.17169.3139.84140.5154.78153.99

    169.59170140.78140.65154.09153.9

    169.8170.32140.68140.81153.84154

    170.07170.45140.49140.93154.12154.05

    170.34170.62140.67141154.09154.35

    170.37170.8140.77141.12154.32154.5

    170.67170.96141.39141.2154.36154.7

    170.74171.1140.87141.4154.49154.8

    170.78171.22140.98141.52154.53155

    170.88171.41141.41141.6154.68155.22

    170.99171.61141.39141.68154.72155.28

    170.99171.84141.15141.72154.83155.35

    171.1171.98141.38141.8155.14155.8

    171.37172.1141.76141.85155.29155.9

    171.18172.19141.63141.92155.45155.97

    171.5172.3141.46142155.55156

    171.52172.52141.57142.1155.72156.25

    171.52172.56141.66142.25155.64156.35

    171.6172.73141.81142.34155.58156.5

    171.63172.9141.66142.4155.72156.56

    171.83172.95141.74142.48155.78156.6

    171.84173141.74142.53155.82156.64

    171.85173.3141.8142.67155.74156.88

    171.88173.4142.25142.77155.87156.95

    171.97173.55141.92142.82155.91157

    172.05173.65141.84142.94155.96157.12

    171.97173.75142.26143155.88157.2

    172.1173.8142.09143.1156.09157.4

    172.14142.17156.18

    172.14142.42156.1

    172.22141.73156.09

    172.3142.2156.14

    172.25142.08156.18

    172.28142.24156.22

    172.43142.07156.17

    172.3142.03156.35

    172.34141.91156.18

    172.36142.61156.32

    172.49142.58156.18

    172.47142.12156.4

    172.51142.42156.48

    172.51142.15156.41

    172.54142.62156.45

    172.54142.17156.45

    172.72142.09156.41

    172.54142.41156.5

    172.73142.58156.46

    172.58142.29156.54

    172.76142.82156.51

    172.8142.27156.6

    172.76142.49156.48

    172.72142.29156.58

    172.69142.73156.58

    172.95141.79156.67

    172.87142.71156.68

    172.78142.49156.69

    172.84142.64156.79

    172.8142.44156.68

    172.86142.69156.6

    172.9142.82156.8

    172.89143.23156.6

    172.98142.94156.72

    172.94142.76156.71

    173.02142.81156.72

    173.05142.49156.85

    173.16142.81156.73

    173.02142.13156.81

    173.07142.53156.77

    172.91143.04156.93

    173.04142.7156.9

    173142.74156.9

    173.14142.86156.85

    173.27142.52156.84

    173.07142.76156.93

    173.15143.2156.93

    173142.62156.97

    173.27142.21156.94

    173.13142.83157.01

    173.11143.25157.01

    173.13142.5156.87

    173.29142.82156.88

    173.29142.61157.04

    173.3142.82156.95

    173.3142.97157

    173.24143.04157.07

    173.26142.64156.96

    173.33143.35157.01

    173.39142.78157.09

    173.34142.93156.93

    173.38143.26157

    173.39142.71157.13

    173.51143.01157.11

    173.35143.34157.23

    173.44142.69157.25

    173.33143.02157.17

    173.45143.18157.17

    173.49142.63157.19

    173.5143.03157.22

    173.57142.93157.29

    173.62142.89157.15

    173.41142.77157.29

    173.53142.98157.34

    173.73143.11157.3

    173.54143.38157.34

    173.57143.2157.19

    173.49143.26157.21

    173.54143.22157.31

    173.6142.65157.26

    173.57143.28157.36

    173.62142.92157.43

    173.65143.38157.28

    173.61143.27157.39

    173.58142.69157.35

    173.68143.34157.43

    173.54142.64157.42

    173.64143.38157.42

    SWL = 113.8 FT

    1242 GPM TestQ/s = 40 GPM/FT

    1800 GPM TestQ/s = 41 GPM/FT

    2392 GPM TestQ/s = 40 GPM/FT

    24 hours

    1242 GPM

    1800 GPM

    2392 GPM

    Transducer Data

    Hand Data

    24 hour

    PW-77 Trans

    1250GPM

    pw-77 trans 1800

    1800GPM

    Elapsed Time (Minutes)

    Depth To Water (Feet)

    City Of Roseville Well W-77(9/25/2006)

    Constant Rate Pump Test PW-77

    148.15154.91110130.33113.45

    154.48155.33170131.93114.02

    155.78154.7132.13114.45

    154.69154.73132.52114.76

    155.03154.4132.82115.01

    154.78154.85132.82115.23

    154.84153.64133.12115.41

    154.7153.88132.72115.57

    153.8153.89132.82115.71

    153.81154.21132.82115.82

    154.1154.55133.12115.93

    154.15154.8133.22116.03

    154.51154.85133.32116.13

    154.43154.9133.43116.23

    154.7155.05133.53116.32

    154.64155.15133.53116.39

    154.69155.26133.73116.48

    154.95155.34133.73116.56

    154.85155.52133.83116.63

    154.94155.6133.93116.69

    154.95155.85133.93116.76

    155156133.93116.82

    155.07156.1134.03116.87

    155.13156.23134.03116.93

    155.15156.35134.03116.98

    155.07156.42134.23117.04

    155.34156.67134.33117.08

    155.45156.82134.33117.13

    155.69156.91134.33117.18

    155.54156.97134.43117.19

    155.54157.05134.53117.26

    155.54157.21134.63117.31

    155.59157.57134.53117.35

    155.79157.98134.63117.39

    155.71158.27134.63117.43

    155.79158.45134.73117.47

    155.79158.6134.73117.51

    155.78158.7134.83117.56

    155.82158.75134.83117.58

    155.76158.83134.83117.62

    155.97158.9134.83117.65

    155.87159.25134.93117.68

    155.91159.32134.93117.71

    156.16159.53134.94117.76

    156.01159.6135.04117.8

    156.18159.73134.94117.81

    156.09159.78134.94117.86

    156.19159.87135.04117.88

    156.22159.98135.04117.9

    156.18160.07135.14117.94

    156.31135.04117.96

    156.14135.24117.98

    156.27135.14118.01

    156.27135.23118.02

    156.16135.33118.06

    156.41135.23118.09

    156.21135.23118.12

    156.45135.33118.14

    156.35135.33118.15

    156.5135.33118.17

    156.43135.33118.19

    156.42135.33118.21

    156.47135.33118.23

    156.45135.44118.25

    156.54135.44118.28

    156.5135.44118.3

    156.46135.44118.33

    156.56135.44118.36

    156.54135.44118.37

    156.54135.54118.39

    156.63135.54118.41

    156.61135.54118.44

    156.72135.54118.44

    156.55135.64118.46

    156.67135.64118.49

    156.69135.64118.49

    156.65135.54118.52

    156.61135.64118.53

    156.77135.64118.56

    156.72135.64118.57

    156.84135.64118.58

    156.73135.74118.59

    156.76135.74118.6

    156.72135.74118.63

    156.78135.74118.65

    156.96135.74118.66

    156.78135.74118.68

    156.86135.74118.7

    156.89135.84118.72

    156.96135.84118.73

    156.85135.84118.75

    156.8135.84118.77

    156.97135.84118.78

    156.93135.93118.78

    156.87135.93118.8

    157.02135.83118.81

    156.89135.93118.83

    156.85136.03118.84

    156.95135.93118.86

    156.98135.93118.85

    157.05136.03118.88

    157.14136.03118.89

    157.01136.03118.91

    156.97136.04118.93

    156.93136.04118.94

    157.06136.04118.94

    157.11136.04118.97

    157.11136.04118.98

    157.15136.14118.99

    157.17136.14118.98

    157.24136.14119.01

    157.19136.14119.03

    157.2136.24119.04

    157.23136.14119.05

    157.23136.14119.07

    157.28136.14119.08

    157.15136.24119.11

    157.23136.14119.08

    157.31136.24119.12

    157.23136.24119.11

    157.36136.24119.14

    157.24136.24119.13

    157.31136.14119.17

    157.24136.24119.17

    157.32136.24119.19

    157.2136.24119.18

    157.38136.34119.19

    157.28136.34119.21

    157.28136.34119.22

    157.44136.34119.22

    157.39136.34119.23

    157.39136.34119.25

    157.35136.34119.26

    157.3136.34119.26

    157.45136.34119.29

    157.4136.34119.3

    157.43136.34119.32

    157.47136.34119.31

    157.41136.44119.32

    157.4136.44119.33

    157.32136.44119.33

    157.45136.44119.34

    157.48136.44119.35

    157.61136.44119.36

    157.55136.44119.38

    157.41136.54119.39

    157.53136.44119.39

    157.56136.44119.4

    157.47136.54119.41

    157.41136.54119.43

    157.61136.54119.43

    157.78136.64119.44

    157.81136.74119.45

    157.76136.64119.46

    157.72136.64119.48

    157.78136.74119.49

    157.83136.74119.5

    157.78136.74119.49

    157.81136.74119.51

    157.85136.74119.53

    157.79136.74119.53

    157.87136.74119.54

    157.85136.74119.56

    157.91136.75119.56

    157.84136.75119.58

    157.88136.85119.59

    157.9136.85119.6

    157.91136.85119.6

    157.98136.75119.62

    157.95136.85119.62

    157.99136.85119.63

    158136.75119.64

    157.95136.85119.65

    157.96136.85119.66

    157.92136.85119.67

    157.96136.85119.68

    158136.95119.67

    158.08136.85119.7

    158.03136.85119.7

    158.03136.85119.72

    157.92136.95119.72

    158.22136.95119.74

    158.04136.95119.74

    158.08136.94119.75

    158.04136.94119.75

    158.06136.94119.74

    158.03136.94119.76

    158.07136.94119.77

    158.06137.04119.77

    158.08137.04119.78

    158.06136.94119.78

    158.14136.94119.79

    158.1137.04119.81

    158.02137.04119.8

    158.18136.94119.79

    158.18137.04119.81

    158.03137.04119.82

    158.19137.04119.83

    158.2137.04119.82

    158.2137.04119.83

    157.97137.04119.85

    158.18137.04119.86

    158.28137.14119.87

    158.19137.04119.88

    158.28137.04119.89

    158.21137.04119.88

    158.19137.04119.9

    158.12137.04119.89

    158.25137.04119.91

    158.19137.04119.91

    158.25137.14119.92

    158.24137.14119.93

    158.21137.14119.94

    158.33137.15119.94

    158.38137.05119.96

    158.22137.15119.96

    158.3137.15119.98

    158.32137.15119.98

    158.3137.15119.98

    158.29137.15120

    158.26137.15120

    158.26137.15120

    158.33137.15120.02

    158.32137.15120.02

    158.36137.15120.03

    158.36137.15120.03

    158.28137.15120.04

    158.36137.15120.04

    158.47137.15120.05

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    160.1139.01121.95

    160.05139.11121.95

    160.14139.01121.93

    160.05139.01121.93

    160.06139.01121.94

    160.06139.01121.95

    160.06139.01121.94

    160.02139.01121.94

    159.98139.01121.94

    160.05139.01121.95

    160138.92121.95

    160.03139.12121.97

    160.1139.12121.96

    160.08139.02121.96

    160.03139.12121.96

    160.04139.02121.96

    160.12139.02121.97

    160.01139.12121.95

    160.03139.12121.96

    160.18139.12121.97

    160.08139.11121.97

    160.14139.11121.95

    160.1139.11121.96

    160.24139.01121.96

    159.94138.91121.97

    160.03139.01121.98

    160.03139.11121.96

    159.93139.11121.97

    160.11139.11121.98

    160.06139.01121.97

    160.13139.11121.97

    160.19139.11121.99

    160.09139.11121.98

    160139.11121.98

    160.17139.11121.98

    160.13139.11121.99

    160.14139.11121.97

    160.17139.11121.95

    160.1139.11121.98

    160.06139.01121.99

    160.07139.01121.98

    160.06139.11121.98

    160139.11121.98

    160.02139.11121.99

    160.19139.01122

    160.05139.11121.98

    160.1138.81122.01

    24 hours

    1793 GPM TestQ/s = 39 GPM/FT

    MW 604 (SWL = 112.62)

    MW 516 (SWL = 113.91)

    PW-77 (SWL = 114.07)

    PW-77 Transducer

    PW-77 Hand Data

    Transducer data MW 516

    Transducer Data MW 604

    Elapsed Time (minutes)

    Depth To Water (feet)

    City Of Roseville Well W-7716-Hour Constant Rate Test (9/26/06)

    hand data PW-77

    Step Tests - 9/25/061250GPMStep Tests - 9/25/061800GPMStep Tests - 9/25/062400GPM

    Elapsed TimeTotalizerDTW Dec. Ft.Elapsed TimeTotalizerDTW Dec. Ft.Elapsed TimeTotalizerDTW Dec. Ft.

    17235138.217384153.1517600168.1

    2139.52154.462169

    31403154.563169.1

    4140.34154.774169.25

    5140.55153.995169.3

    6140.656153.96170

    7140.8171547170.32

    8140.938154.058170.45

    91419154.359170.62

    107247141.12107403154.510170.8

    12141.212154.712170.96

    14141.414154.814171.1

    16141.521615516171.22

    18141.618155.2218171.41

    207260141.6820155.28207648171.61

    22141.72227424155.3522171.84

    24141.824155.824171.98

    26141.8526155.926172.1

    28141.9228155.9728172.19

    307272142307439156307672172.3

    35142.135156.2535172.52

    40142.2540156.3540172.56

    45142.3445156.545172.73

    50142.450156.5650172.9

    55142.4855156.655172.95

    607310142.53607483156.64607744173

    70142.6770156.8870173.3

    80142.7780156.9580173.4

    907347142.82907547157907816173.55

    100142.94100157.12100173.65

    110143110157.2110173.75

    1207384143.11207600157.41207887173.8

    1440125

    1440185

    16 Hour Test1800 GPM

    Constant Rate Test (9/26/06)

    Recorded Elapsed TimeTotalizerDTW dec. Ft.

    1154.9114401451440110

    2155.3314401651440170

    3154.7

    4154.73

    5154.4

    6154.85

    7153.64

    8153.88

    9153.89

    10154.21

    12154.55

    14154.8

    16154.85

    18154.9

    20155.05

    22155.15

    24155.26

    26155.34

    28155.52

    30155.6

    35155.85

    40156

    45156.1

    50156.23

    55156.35

    60156.42

    70156.67

    80156.82

    90156.91

    100156.97

    110157.05

    120157.21

    150157.57

    180157.98

    210158.27

    240158.45

    270158.6

    300158.7

    330158.75

    360158.83

    420158.9

    480159.25

    540159.32

    600159.53

    660159.6

    720159.73

    780159.78

    840159.87

    900159.98

    960160.07

    PW-77 100m comp

    DateTimeLevelDepthTempElapsed Time (Constant Rate)

    9/25/0646:28.09/25/06 7:46 AM-0.3922.43

    9/25/0647:28.09/25/06 7:47 AM-0.2922.53

    9/25/0648:28.09/25/06 7:48 AM-0.1922.57

    9/25/0649:28.09/25/06 7:49 AM-0.222.65

    9/25/0650:28.09/25/06 7:50 AM-0.222.72

    9/25/0651:28.09/25/06 7:51 AM-0.222.68

    9/25/0652:28.09/25/06 7:52 AM-0.222.7

    9/25/0653:28.09/25/06 7:53 AM-0.122.75

    9/25/0654:28.09/25/06 7:54 AM-0.122.78

    9/25/0655:28.09/25/06 7:55 AM-0.122.81

    9/25/0656:28.09/25/06 7:56 AM-0.122.83

    9/25/0657:28.09/25/06 7:57 AM-0.122.85

    9/25/0658:28.09/25/06 7:58 AM-0.122.89

    9/25/0659:28.09/25/06 7:59 AM-0.122.93

    9/25/0600:28.09/25/06 8:00 AM-0.122.95

    9/25/0601:28.09/25/06 8:01 AM-0.122.95

    9/25/0602:28.09/25/06 8:02 AM-0.122.99

    9/25/0603:28.09/25/06 8:03 AM-0.122.99

    9/25/0604:28.09/25/06 8:04 AM-0.123.03

    9/25/0605:28.09/25/06 8:05 AM-0.123.03

    9/25/0606:28.09/25/06 8:06 AM-0.123.07

    9/25/0607:28.09/25/06 8:07 AM-0.123.09

    9/25/0608:28.09/25/06 8:08 AM-0.123.1

    9/25/0609:28.09/25/06 8:09 AM-0.0923.13

    9/25/0610:28.09/25/06 8:10 AM-0.0923.19

    9/25/0611:28.09/25/06 8:11 AM0.0123.15

    9/25/0612:28.09/25/06 8:12 AM0.0123.23

    9/25/0613:28.09/25/06 8:13 AM-0.0923.18

    9/25/0614:28.09/25/06 8:14 AM-0.0923.24

    9/25/0615:28.09/25/06 8:15 AM-0.0923.24

    9/25/0616:28.09/25/06 8:16 AM-0.0923.27

    9/25/0617:28.09/25/06 8:17 AM-0.0923.33

    9/25/0618:28.09/25/06 8:18 AM-0.0923.27

    9/25/0619:28.09/25/06 8:19 AM-0.0923.32

    9/25/0620:28.09/25/06 8:20 AM0.0123.36

    9/25/0621:28.09/25/06 8:21 AM0.0123.37

    9/25/0622:28.09/25/06 8:22 AM0.0123.38

    9/25/0623:28.09/25/06 8:23 AM-0.0923.41

    9/25/0624:28.09/25/06 8:24 AM-0.2923.85

    9/25/0625:28.09/25/06 8:25 AM-0.2924.39

    9/25/0626:28.09/25/06 8:26 AM-0.3924.56

    9/25/0627:28.09/25/06 8:27 AM-0.2924.53

    9/25/0628:28.09/25/06 8:28 AM-0.1924.51

    9/25/0629:28.09/25/06 8:29 AM-0.224.48

    9/25/0630:28.09/25/06 8:30 AM-0.224.49

    9/25/0631:28.09/25/06 8:31 AM-0.224.53

    9/25/0632:28.09/25/06 8:32 AM-0.124.55

    9/25/0633:28.09/25/06 8:33 AM-0.124.56

    9/25/0634:28.09/25/06 8:34 AM-0.224.61

    9/25/0635:28.09/25/06 8:35 AM-0.124.59

    9/25/0636:28.09/25/06 8:36 AM-0.224.59

    9/25/0637:28.09/25/06 8:37 AM-0.224.59

    9/25/0638:28.09/25/06 8:38 AM-0.124.59

    9/25/0639:28.09/25/06 8:39 AM-0.124.58

    9/25/0640:28.09/25/06 8:40 AM-0.124.59

    9/25/0641:28.09/25/06 8:41 AM-0.124.59

    9/25/0642:28.09/25/06 8:42 AM-0.124.59

    9/25/0643:28.09/25/06 8:43 AM-0.124.57

    9/25/0644:28.09/25/06 8:44 AM-0.124.54

    9/25/0645:28.09/25/06 8:45 AM-0.124.53

    9/25/0646:28.09/25/06 8:46 AM-0.124.46

    9/25/0647:28.09/25/06 8:47 AM-0.124.43

    9/25/0648:28.09/25/06 8:48 AM-0.124.41

    9/25/0649:28.09/25/06 8:49 AM-0.0924.39

    9/25/0650:28.09/25/06 8:50 AM-0.0924.35

    9/25/0651:28.09/25/06 8:51 AM-0.0924.33

    9/25/0652:28.09/25/06 8:52 AM-0.0924.29

    9/25/0653:28.09/25/06 8:53 AM-0.0924.26

    9/25/0654:28.09/25/06 8:54 AM-0.0924.25

    9/25/0655:28.09/25/06 8:55 AM0.0224.24

    9/25/0656:28.09/25/06 8:56 AM-0.0724.21

    9/25/0657:28.09/25/06 8:57 AM-0.0724.21

    9/25/0658:28.09/25/06 8:58 AM-0.0624.19

    9/25/0659:28.09/25/06 8:59 AM-0.0624.16

    9/25/0600:28.09/25/06 9:00 AM-0.0524.11

    9/25/0601:28.09/25/06 9:01 AM-0.0424.1

    9/25/0602:28.09/25/06 9:02 AM-0.0424.1

    9/25/0603:28.09/25/06 9:03 AM-0.0324.09

    9/25/0604:28.09/25/06 9:04 AM-0.0224.07

    9/25/0605:28.09/25/06 9:05 AM-0.0124.07

    9/25/0606:28.09/25/06 9:06 AM0.124.09

    9/25/0607:28.09/25/06 9:07 AM-0.0924.06

    9/25/0608:28.09/25/06 9:08 AM-0.0724.06

    9/25/0609:28.09/25/06 9:09 AM-0.0624.06

    9/25/0610:28.09/25/06 9:10 AM0.0524.06

    9/25/0611:28.09/25/06 9:11 AM0.0624.05

    9/25/0612:28.09/25/06 9:12 AM-0.0324.05

    9/25/0613:28.09/25/06 9:13 AM0.0924.05

    9/25/0614:28.09/25/06 9:14 AM0.0924.06

    9/25/0615:28.09/25/06 9:15 AM0.0924.02

    9/25/0616:28.09/25/06 9:16 AM-0.0224.03

    9/25/0617:28.09/25/06 9:17 AM0.0824.04

    9/25/0618:28.09/25/06 9:18 AM0.0824.02

    9/25/0619:28.09/25/06 9:19 AM-0.0224.04

    9/25/0620:28.09/25/06 9:20 AM-0.0224

    9/25/0621:28.09/25/06 9:21 AM0.0723.97

    9/25/0622:28.09/25/06 9:22 AM0.0724.01

    9/25/0623:28.09/25/06 9:23 AM0.0723.97

    9/25/0624:28.09/25/06 9:24 AM-0.0323.97

    9/25/0625:28.09/25/06 9:25 AM0.0623.95

    9/25/0626:28.09/25/06 9:26 AM0.0523.95

    9/25/0627:28.09/25/06 9:27 AM0.1523.93

    9/25/0628:28.09/25/06 9:28 AM0.0423.91

    9/25/0629:28.09/25/06 9:29 AM0.0423.92

    9/25/0630:28.09/25/06 9:30 AM0.0323.92

    9/25/0631:28.09/25/06 9:31 AM0.0223.93

    9/25/0632:28.09/25/06 9:32 AM0.0223.91

    9/25/0633:28.09/25/06 9:33 AM0.0123.91

    9/25/0634:28.09/25/06 9:34 AM0.0123.93

    9/25/0635:28.09/25/06 9:35 AM0.0123.91

    9/25/0636:28.09/25/06 9:36 AM023.91

    9/25/0637:28.09/25/06 9:37 AM023.91

    9/25/0638:28.09/25/06 9:38 AM023.91

    9/25/0639:28.09/25/06 9:39 AM0.123.92

    9/25/0640:28.09/25/06 9:40 AM023.91

    9/25/0641:28.09/25/06 9:41 AM-0.0123.91

    9/25/0642:28.09/25/06 9:42 AM-0.0123.93

    9/25/0643:28.09/25/06 9:43 AM-0.0124.17

    9/25/0644:28.09/25/06 9:44 AM-0.1124.56

    9/25/0645:28.09/25/06 9:45 AM-0.1124.66

    9/25/0646:28.09/25/06 9:46 AM-0.1124.69

    9/25/0647:28.09/25/06 9:47 AM-0.0124.7

    9/25/0648:28.09/25/06 9:48 AM-0.0124.66

    9/25/0649:28.09/25/06 9:49 AM024.66

    9/25/0650:28.09/25/06 9:50 AM024.67

    9/25/0651:28.09/25/06 9:51 AM024.65

    9/25/0652:28.09/25/06 9:52 AM024.65

    9/25/0653:28.09/25/06 9:53 AM-0.124.63

    9/25/0654:28.09/25/06 9:54 AM024.61

    9/25/0655:28.09/25/06 9:55 AM024.63

    9/25/0656:28.09/25/06 9:56 AM024.62

    9/25/0657:28.09/25/06 9:57 AM024.63

    9/25/0658:28.09/25/06 9:58 AM024.59

    9/25/0659:28.09/25/06 9:59 AM024.55

    9/25/0600:28.09/25/06 10:00 AM024.56

    9/25/0601:28.09/25/06 10:01 AM024.54

    9/25/0602:28.09/25/06 10:02 AM024.54

    9/25/0603:28.09/25/06 10:03 AM024.55

    9/25/0604:28.09/25/06 10:04 AM024.53

    9/25/0605:28.09/25/06 10:05 AM024.54

    9/25/0606:28.09/25/06 10:06 AM024.54

    9/25/0607:28.09/25/06 10:07 AM0.124.54

    9/25/0608:28.09/25/06 10:08 AM024.55

    9/25/0609:28.09/25/06 10:09 AM-0.0124.53

    9/25/0610:28.09/25/06 10:10 AM-0.0124.55

    9/25/0611:28.09/25/06 10:11 AM0.0924.53

    9/25/0612:28.09/25/06 10:12 AM0.0924.53

    9/25/0613:28.09/25/06 10:13 AM-0.0124.55

    9/25/0614:28.09/25/06 10:14 AM-0.0124.53

    9/25/0615:28.09/25/06 10:15 AM-0.0124.54

    9/25/0616:28.09/25/06 10:16 AM-0.0124.55

    9/25/0617:28.09/25/06 10:17 AM-0.0124.55

    9/25/0618:28.09/25/06 10:18 AM0.0924.56

    9/25/0619:28.09/25/06 10:19 AM024.56

    9/25/0620:28.09/25/06 10:20 AM0.124.56

    9/25/0621:28.09/25/06 10:21 AM024.59

    9/25/0622:28.09/25/06 10:22 AM024.57

    9/25/0623:28.09/25/06 10:23 AM024.59

    9/25/0624:28.09/25/06 10:24 AM024.6

    9/25/0625:28.09/25/06 10:25 AM024.61

    9/25/0626:28.09/25/06 10:26 AM024.63

    9/25/0627:28.09/25/06 10:27 AM024.67

    9/25/0628:28.09/25/06 10:28 AM024.73

    9/25/0629:28.09/25/06 10:29 AM024.78

    9/25/0630:28.09/25/06 10:30 AM024.82

    9/25/0631:28.09/25/06 10:31 AM024.84

    9/25/0632:28.09/25/06 10:32 AM024.87

    9/25/0633:28.09/25/06 10:33 AM024.91

    9/25/0634:28.09/25/06 10:34 AM-0.124.96

    9/25/0635:28.09/25/06 10:35 AM-0.125.05

    9/25/0636:28.09/25/06 10:36 AM-0.125.08

    9/25/0637:28.09/25/06 10:37 AM-0.125.12

    9/25/0638:28.09/25/06 10:38 AM-0.225.17

    9/25/0639:28.09/25/06 10:39 AM-0.0925.21

    9/25/0640:28.09/25/06 10:40 AM-0.0925.27

    9/25/0641:28.09/25/06 10:41 AM-0.1925.33

    9/25/0642:28.09/25/06 10:42 AM-0.1925.38

    9/25/0643:28.09/25/06 10:43 AM-0.1925.45

    9/25/0644:28.09/25/06 10:44 AM-0.1825.53

    9/25/0645:28.09/25/06 10:45 AM-0.1625.62

    9/25/0646:28.09/25/06 10:46 AM-0.2425.87

    9/25/0647:28.09/25/06 10:47 AM-0.3226.15

    9/25/0648:28.09/25/06 10:48 AM-0.3126.46

    9/25/0649:28.09/25/06 10:49 AM-0.3926.83

    9/25/0650:28.09/25/06 10:50 AM-0.3727.15

    9/25/0651:28.09/25/06 10:51 AM-0.4527.51

    9/25/0652:28.09/25/06 10:52 AM-0.4327.9

    9/25/0653:28.09/25/06 10:53 AM-0.4228.28

    9/25/0654:28.09/25/06 10:54 AM-0.4128.66

    9/25/0655:28.09/25/06 10:55 AM-0.4129.03

    9/25/0656:28.09/25/06 10:56 AM-0.4229.43

    9/25/0657:28.09/25/06 10:57 AM-0.4229.77

    9/25/0658:28.09/25/06 10:58 AM-0.4230.09

    9/25/0659:28.09/25/06 10:59 AM-0.5330.37

    9/25/0600:28.09/25/06 11:00 AM-0.5330.67

    9/25/0601:28.09/25/06 11:01 AM-0.5330.93

    9/25/0602:28.09/25/06 11:02 AM-0.5431.23

    9/25/0603:28.09/25/06 11:03 AM-0.5431.48

    9/25/0604:28.09/25/06 11:04 AM-0.5531.69

    9/25/0605:28.09/25/06 11:05 AM-0.5631.93

    9/25/0606:28.09/25/06 11:06 AM-0.4732.18

    9/25/0607:28.09/25/06 11:07 AM-0.4932.39

    9/25/0608:28.09/25/06 11:08 AM-0.532.57

    9/25/0609:28.09/25/06 11:09 AM-0.5132.73

    9/25/0610:28.09/25/06 11:10 AM-0.5332.9

    9/25/0611:28.09/25/06 11:11 AM-0.5433.04

    9/25/0612:28.09/25/06 11:12 AM-0.5533.19

    9/25/0613:28.09/25/06 11:13 AM-0.5733.35

    9/25/0614:28.09/25/06 11:14 AM-0.5733.5

    9/25/0615:28.09/25/06 11:15 AM-0.4833.23

    9/25/0616:28.09/25/06 11:16 AM-0.5932.64

    9/25/0617:28.09/25/06 11:17 AM-0.731.93

    9/25/0618:28.09/25/06 11:18 AM-0.631.64

    9/25/0619:28.09/25/06 11:19 AM-0.6131.85

    9/25/0620:28.09/25/06 11:20 AM-0.6232.03

    9/25/0621:28.09/25/06 11:21 AM-0.5231.83

    9/25/0622:28.09/25/06 11:22 AM-0.6331.45

    9/25/0623:28.09/25/06 11:23 AM-0.7431.07

    9/25/0624:28.09/25/06 11:24 AM-0.7430.76

    9/25/0625:28.09/25/06 11:25 AM93.3629.56

    9/25/0626:28.09/25/06 11:26 AM134.66113.825.99

    9/25/0627:28.09/25/06 11:27 AM134.56113.924.45

    9/25/0628:28.09/25/06 11:28 AM134.56113.923.81

    9/25/0629:28.09/25/06 11:29 AM134.4611423.51

    9/25/0630:28.09/25/06 11:30 AM134.36114.123.33

    9/25/0631:28.09/25/06 11:31 AM134.26114.223.23

    9/25/0632:28.09/25/06 11:32 AM134.26114.223.17

    9/25/0633:28.09/25/06 11:33 AM134.36114.123.13

    9/25/0634:28.09/25/06 11:34 AM134.26114.223.08

    9/25/0635:28.09/25/06 11:35 AM134.26114.223.07

    9/25/0636:28.09/25/06 11:36 AM134.26114.223.07

    9/25/0637:28.09/25/06 11:37 AM134.26114.223.07

    9/25/0638:28.09/25/06 11:38 AM134.26114.223.01

    9/25/0639:28.09/25/06 11:39 AM134.26114.223.01

    9/25/0640:28.09/25/06 11:40 AM109.76138.723.04

    9/25/0641:28.09/25/06 11:41 AM109.56138.923.07

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    9/25/0619:28.09/25/06 6:19 PM75.48172.9822.83

    9/25/0620:28.0


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