?TITLE 35: ENVIRONMENTAL PROTECTION?

TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE F: PUBLIC WATER SUPPLIES
ERATTA SHEET
REVISIONS to:
TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE F: PUBLIC WATER SUPPLIES
CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY
PART 671
MAXIMUM SETBACK ZONE FOR COMMUNITY WATER SUPPLY WELLS
1. Section 671.104 Agency Mailing Address
  1. PROCEDURE

Title 35 Environmental Protection Agency § 671.Contents

Subtitle F Part 671 - 1 August 25, 1988

TITLE 35: ENVIRONMENTAL PROTECTION

SUBTITLE F: PUBLIC WATER SUPPLIES

CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY

PART 671

MAXIMUM SETBACK ZONE FOR COMMUNITY WATER SUPPLY WELLS

SUBPART A: INTRODUCTION

Section

671.101 Purpose

671.102 Definitions

671.103 Severability

671.104 Agency Mailing Address

SUBPART B: PROCEDURES FOR DETERMINING THE LATERAL AREA OF INFLUENCE OF

WELLS UNDER NORMAL OPERATIONAL CONDITIONS

Section

671.201 Estimation Techniques and Pumping Test

671.202 Agency Approval of Alternate Estimation Techniques, Pump Tests, or Other Procedures

SUBPART C: REQUESTS FOR AGENCY REVIEW AND CONFIRMATION

Section

671.301 General

671.302 Contents of a Request

671.303 Agency Approval of Alternate Certification

671.304 Agency Review and Confirmation

671.305 Adoption of a Maximum Setback Zone Ordinance

671.306 Changing a Maximum Setback Zone

APPENDIX A Volumetric Flow Equation

APPENDIX B Theis Equation Using Available Data

APPENDIX C Todd Uniform Flow Equation

APPENDIX D Neuman Equations and Pump Test Procedures for Unconfined or Water Table Aquifers

APPENDIX E Theis Equations and Pump Test Procedures for Confined Aquifers

APPENDIX F Hydrogeologic Mapping

TABLE A Well Functions for Confined Aquifers

TABLE B Well Functions for Unconfined or Water Table Aquifers

AUTHORITY: Implementing and authorized by Section 14.3 of the Environmental Protection Act (Ill. Rev.

Stat. 1987, ch. 111 1/2, par. 1014.3).

SOURCE: Adopted at 12 Ill. Reg. 14134, effective August 25, 1988.

Title 35 Environmental Protection Agency § 671.101

Subtitle F Part 671 - 2 August 25, 1988

SUBPART A: INTRODUCTION

Section 671.101 Purpose

a) Section 14.2 of the Act establishes a minimum setback zone for existing or permitted community

water supply wells or other potable water supply wells.

b) Section 14.3 of the Act authorizes a maximum setback zone to be established for community water

supply wells.

c) In order to establish a maximum setback zone, the lateral area of influence of the well under normal

operational conditions must be determined.

d) OWNERS OF COMMUNITY WATER SUPPLIES WHICH UTILIZE ANY WATER WELL, OR ANY

COUNTY OR MUNICIPALITY SERVED BY ANY COMMUNITY WATER SUPPLY WELL, MAY

DETERMINE THE LATERAL AREA OF INFLUENCE OF THE WELL UNDER NORMAL

OPERATIONAL CONDITIONS. THE AGENCY SHALL ADOPT PROCEDURES BY WHICH SUCH

DETERMINATIONS MAY BE MADE INCLUDING, WHERE APPROPRIATE, PUMPING TESTS AND

ESTIMATION TECHNIQUES. (Section 14.3(a) of the Environmental Protection Act (Ill. Rev. Stat.

1987, ch. 111 1/2, par. 1014.3(a))).

e) The rules set forth in this Part describe the procedures for establishing a maximum setback zone

under Sections 14.3(a), 14.3(b), and 14.3(c) of the Act.

f) The rules set forth in Subpart B describe the procedures to be used by owners of community water

supplies, by counties, or by municipalities to determine the lateral area of influence of community

water supply wells. The rules set forth in Subpart C describe the procedures to be used by counties

or municipalities in requesting Agency review and confirmation of this determination.

Section 671.102 Definitions

a) Unless specified otherwise, all terms shall have the meanings set forth in the Act and the Illinois

Groundwater Protection Act (Ill. Rev. Stat. 1987, ch. 111 1/2, pars. 7451 et seq.).

b) For purposes of this Part, the following definitions apply:

"Act" means the Environmental Protection Act (Ill. Rev. Stat., 1987, ch. 111 1/2, pars. 1001 et seq., as

amended).

"Agency" means the Illinois Environmental Protection Agency.

"Certified professional geologist" means a person certified by the American Institute of Professional

Geologists.

"Confined aquifer" means an aquifer bounded above and below by impermeable beds or by shale,

clay, or siltstone.

"Drawdown" means the change in the water elevation of the static water level produced by a pumping

well.

"Normal operational conditions" mean capability of a well at or under the safe yield rate.

Title 35 Environmental Protection Agency § 671.103

Subtitle F Part 671 - 3 August 25, 1988

"Professional judgment" means the use of those engineering principles and practices used by

engineers when fulfilling their requirements and duties consistent with the specific requirements of this

Part and as certified by a Professional Engineer licensed under the Illinois Professional Engineering

Act (Ill. Rev. Stat. 1987, ch. 111, par. 5101 et seq.), or the use of those geologic principles and

practices used by geologists when fulfilling their requirements and duties consistent with the specific

requirements of this Part and as certified by a certified professional geologist who is a member of the

American Institute of Professional Geologists (7828 Vance Drive, Suite 103, Arvada, Colorado 80003,

January 17, 1988).

"Registered professional engineer" means a person registered under the provisions of the Illinois

Professional Engineering Act (Ill. Rev. Stat. 1987, ch. 111, par. 5101 et seq.).

"Safe yield rate" means the rate (in gallons pumped per minute per foot of drawdown) at which water

can be withdrawn from an aquifer without depleting the supply.

"Unconfined aquifer" means an aquifer other than a confined aquifer.

Section 671.103 Severability

If any provisions of this Part or the application thereof to any person or in any circumstance is adjudged

invalid, such adjudication shall not affect the validity of this Part as a whole or any provision thereof not

adjudged invalid.

Section 671.104 Agency Mailing Address

Each request, report, notice, or other document submitted to the Agency under this Part shall be mailed to

the following address:

Manager, Groundwater Section

Division of Public Water Supplies

Illinois Environmental Protection Agency

2200 Churchill Road

Post Office Box 19276

Springfield, Illinois 62794-9276

SUBPART B: PROCEDURES FOR DETERMINING THE LATERAL AREA OF INFLUENCE OF

WELLS UNDER NORMAL OPERATIONAL CONDITIONS

Section 671.201 Estimation Techniques and Pumping Test

Owners of community water supplies which utilize any water well, or any county or municipality served by

any community water supply well, shall determine the lateral area of influence of the well under normal

operational conditions in accordance with one or more of the following:

a) The Volumetric Flow Equation set forth in Appendix A;

b) The Theis Equation Using Available Data set forth in Appendix B;

c) The Todd Uniform Flow Equation set forth in Appendix C;

Title 35 Environmental Protection Agency § 671.202

Subtitle F Part 671 - 4 August 25, 1988

d) The Neuman Equations and Pump Test Procedures for Unconfined or Water Table Aquifers set forth

in Appendix D;

e) The Theis Equations and Pump Test Procedures for Confined Aquifers set forth in Appendix E;

f) Hydrogeologic Mapping as set forth in Appendix F; or

g) An alternate estimation technique, pump test, or other procedure approved by the Agency in

accordance with Section 671.202.

Section 671.202 Agency Approval of Alternate Estimation Techniques, Pump Tests, or Other

Procedures

The Agency shall approve an estimation technique, pump test, or other procedure that, based upon the

Agency's professional judgment, is equivalent to one or more of the methods described in Section

671.201(a) through (f).

SUBPART C: REQUESTS FOR AGENCY REVIEW AND CONFIRMATION

Section 671.301 General

WHERE THE RESULTS OF ANY DETERMINATION MADE PURSUANT TO SECTION 671.201

DISCLOSE THAT THE DISTANCE FROM THE WELL TO THE OUTERMOST BOUNDARY OF THE

LATERAL AREA OF INFLUENCE OF THE WELL UNDER NORMAL OPERATIONAL CONDITIONS

EXCEEDS THE RADIUS OF THE MINIMUM SETBACK ZONE ESTABLISHED FOR THAT WELL

PURSUANT TO SECTION 14.2 OF THE ACT, ANY COUNTY OR MUNICIPALITY SERVED BY SUCH

WATER SUPPLY MAY IN WRITING REQUEST THE AGENCY TO REVIEW AND CONFIRM THE

TECHNICAL ADEQUACY OF SUCH DETERMINATION. (Section 14.3(b) of the Act).

Section 671.302 Contents of a Request

Each county or municipality requesting Agency review and confirmation under Section 14.3(b) of the Act

shall complete a request form prescribed by the Agency and shall:

a) Submit proof that the determination made pursuant to Section 671.201 describes the outer boundary

of drawdown of the affected groundwater by the well under normal operational conditions. Such proof

shall include, but not be limited to, the following:

1) Geologic logs and well construction details;

2) Aquifer test data, if an estimation technique or pump test described in Section 671.201(a), (d), or

(e) is used;

3) Hydrogeologic information and the source of that information, if the estimation technique

described in Section 671.201(c) is used; and

4) Geologic maps and the source of those maps, if the procedure described in Section 671.201(f) is

used.

b) Submit the proposed ordinance to be adopted pursuant to Section 14.3(c) of the Act.

Title 35 Environmental Protection Agency § 671.202

Subtitle F Part 671 - 5 August 25, 1988

c) If an estimation technique or pump test described in Section 671.201(c) through (f) is used, include

the following certification by a registered professional engineer, certified professional geologist, or

other person approved by the Agency under Section 671.303:

I hereby certify that I am familiar with the information contained in this application, and that to the best

of my knowledge and belief such information is true, complete, and accurate.

Section 671.303 Agency Approval of Alternate Certification

The Agency shall approve the certification under Section 671.302(c) by a person other than a registered

professional engineer or a certified professional geologist if the county or municipality proves that such

person has a bachelor's degree or a graduate degree in science or engineering, and has work experience

in Geology, Hydrogeology, or Earth Science. The proof shall include, but not necessarily be limited to, a

resume for such person and the name, address, and telephone number of not fewer than three personal

references who can verify the education and work experience of such person.

Section 671.304 Agency Review and Confirmation

a) THE AGENCY SHALL, WITHIN 90 DAYS OF ANY WRITTEN REQUEST under Section 14.3(b) of the

Act, NOTIFY THE COUNTY OR MUNICIPALITY WHETHER THE DETERMINATION IS

TECHNICALLY ADEQUATE FOR DESCRIBING THE OUTER BOUNDARY OF DRAWDOWN OF

THE AFFECTED GROUNDWATER BY THE WELL UNDER NORMAL OPERATIONAL

CONDITIONS. (Section 14.3(b) of the Act) The Agency will determine if the county or municipality

has made a technically adequate determination by using the requirements of this Part.

b) ANY ACTION BY THE AGENCY under this Section SHALL BE IN WRITING AND SHALL

CONSTITUTE A FINAL DETERMINATION OF THE AGENCY. (Section 14.3(b) of the Act)

Section 671.305 Adoption of a Maximum Setback Zone Ordinance

a) UPON RECEIPT OF AGENCY CONFIRMATION OF THE TECHNICAL ADEQUACY OF THE

DETERMINATION under Section 14.3(b) of the Act, THE COUNTY OR MUNICIPALITY MAY, AFTER

NOTICE AND OPPORTUNITY FOR COMMENT, ADOPT AN ORDINANCE SETTING FORTH THE

LOCATION OF EACH AFFECTED WELL AND SPECIFYING THE BOUNDARIES OF A MAXIMUM

SETBACK ZONE, WHICH BOUNDARIES MAY BE IRREGULAR. IN NO EVENT, HOWEVER,

SHALL ANY PORTION OF SUCH A BOUNDARY BE IN EXCESS OF 1,000 FEET FROM THE

WELLHEAD. (Section 14.3(c) of the Act).

b) SUCH ORDINANCE SHALL INCLUDE THE AREA WITHIN THE APPLICABLE MINIMUM SETBACK

ZONE AND SHALL INCORPORATE REQUIREMENTS WHICH ARE CONSISTENT WITH BUT NOT

MORE STRINGENT THAN THE PROHIBITIONS OF THE ACT AND THE REGULATIONS

PROMULGATED BY THE BOARD under Section 14.4 of the Act. (Section 14.3(c) of the Act).

c) UPON ADOPTION, THE COUNTY OR MUNICIPALITY SHALL PROVIDE A COPY OF THE

ORDINANCE TO THE AGENCY. (Section 14.3(c) of the Act).

d) ANY COUNTY OR MUNICIPALITY WHICH FAILS TO ADOPT SUCH AN ORDINANCE WITHIN 2

YEARS OF RECEIPT OF AGENCY CONFIRMATION OF TECHNICAL ADEQUACY MAY NOT

PROCEED UNDER THE AUTHORITY OF SECTION 14.3 OF THE ACT WITHOUT OBTAINING A

NEW CONFIRMATION OF THE TECHNICAL ADEQUACY pursuant to Section 14.3(b) of the Act.

(Section 14.3(c) of the Act)

Title 35 Environmental Protection Agency § 671.306

Subtitle F Part 671 - 6 August 25, 1988

Section 671.306 Changing a Maximum Setback Zone

If a county or municipality has established a maximum setback zone by ordinance, the county or

municipality shall, upon adoption, provide a copy to the Agency of each ordinance which in any way

modifies the maximum setback zone.

Section 671.APPENDIX A Volumetric Flow Equation

For unconfined unconsolidated, or unconfined non-fractured bedrock aquifers the lateral radius of influence can be

calculated as follows:

r = radius of influence (feet)

Q = daily flow from the well under normal operational conditions (cubic feet per day)

t = time that the well is pumped under normal operational conditions (minutes)

H = open interval or length of well screen (feet)

n = aquifer porosity (see Figure A-1) unless more site specific information is available

Sand 0.21 Sandstone 0.06

Gravel 0.19 Limestones:

Sand & Gravel 0.15 Primary dolomites, 0.18

Secondary dolomites 0.18

Figure A-1

Section 671.APPENDIX B Theis Equation Using Available Data

If pump test data is available for an unconfined/confined unconsolidated or non-fractured bedrock aquifer the lateral

radius of influence can be calculated as follows:

r = radius of influence (feet)

t = time well is pumped under normal operational conditions (minutes)

S = aquifer storativity or specific yield (dimensionless)

T = aquifer transmissivity (gallons per day per foot)

u = is a dimensionless parameter related to the well function

W(u) = T(hO - h)

114.6Q

Where:

w(u) = well function, the well function is calculated and u is obtained from Table A.

hO - h = drawdown in the piezometer or observation well (feet)

Title 35 Environmental Protection Agency § 671. Appendix C

Subtitle F Part 671 - 7 August 25, 1988

Q = production well discharge rate under normal operational conditions (gallons per minute)

Section 671.APPENDIX C Todd Uniform Flow Equation

If hydrogeologic information (e.g., transmissivity, porosity, hydraulic gradient, hydraulic conductivity, and saturated

thickness of the aquifer) is available the lateral area of influence can be calculated for unconfined/confined

unconsolidated or non-fractured bedrock aquifers as follows:

X = 1.19 Q Y = 7.48 Q

Ti Ti

Where:

Q = daily flow from the well under normal operational conditions (cubic feet per day)

i = hydraulic gradient of the water table or potentiometric surface

T = aquifer transmissivity (gallons per day per foot)

X = lateral area of influence or down gradient divide (feet)

Y = maximum width of the lateral area of influence or the maximum width of the influx zone (feet)

The distance to the upgradient divide is established as the distance to the upgradient regional groundwater divide.

Section 671.APPENDIX D Neuman Equations and Pump Test Procedures for

Unconfined or Water Table Aquifers

If no data is available for unconsolidated or non-fractured bedrock aquifer constants, a pump test can be conducted

to determine the lateral radius of influence as follows:

A. At least one fully penetrating observation well is necessary.

B. The pump test should be conducted for at least 48 hours.

C. The flow equation for unconfined aquifers is given by:

T = transmissivity (gallons per day per food)

Q = production well discharge rate (gallons per minute)

hO - h = drawdown in the observation well (feet)

W(uA, uB

∋

) = well function for unconfined aquifers, the well function is calculated and (uA,

obtained from Table B

= 2693r

S (Early phase drawn)

∋

= r

v

Tt b

= 2693r

Sy (late phase drawndown)

Tt T = Khxb

Where:

S = storativity (dimensionless)

Sy = specific yield (dimensionless)

t = time (minutes)

b = aquifer saturated thickness (feet)

Title 35 Environmental Protection Agency § 671. Appendix E

Subtitle F Part 671 - 8 August 25, 1988

v

= aquifer vertical hydraulic conductivity (gallons per day per square feet)

Kh = aquifer horizontal hydraulic conductivity (gallons per day per square feet)

r = distance from the production well to observation well (feet)

The radius of influence can then be calculated using the following:

t = time pumped under normal operational conditions (minutes).

Two sets of type curves are used (Neuman, 1975). Type-A curves are used for early phase drawdown data, and

Type-B curves are used for late phase drawdown. The type curves are used to evaluate field data for time and

drawdown, which are plotted on logarithmic paper of the same scale. The following procedure can be used:

1. Overlay time drawdown data on Type-B curves. At any match point, the values of W(uB,

∋

), uB, t, and ho - h

are determined. The value of ? comes from the type curve. The value of T and Sy is calculated using

these values and the following equations:

2. Use the early phase drawdown Type-A curve to calculate W (uA,

∋

), uA, t, hO - h and S using the

∋

value

previously determined for the Type-B curve and the following equation:

S = _TtuA _

2693r

3. The value of horizontal hydraulic conductivity can be determined using:

Kh = T

4. The vertical hydraulic conductivity can be determined using the following:

v

∋

5. The lateral radius of influence can then be calculated with the following:

________

_ uBTt__

r = 2693Sy

Section 671.APPENDIX E Theis Equations and Pump Test Procedures for Confined Aquifers

If no data exists for confined unconsolidated or non-fractured bedrock aquifer constants, a pump test can be

conducted to determine the lateral radius of influence as follows:

A. At least one fully penetrating piezometer is necessary.

B. The pump test should be conducted for at least 24 hours.

C. The flow equations for confined aquifers are as follows:

Title 35 Environmental Protection Agency § 671. Appendix F

Subtitle F Part 671 - 9 August 25, 1988

The Theis type curve is used. The type curve is used to evaluate field data for time and drawdown, which are plotted

on logarithmic paper of the same scale. The following procedure can be used:

1. Overlay time drawdown data on type curve. At any match point, the values of W(u), u, and h? - h are

determined (see Table B).

2. Transmissivity can be calculated using the values from the match point and the following equation:

T = 114.6Q W(u)

hO - h

3. From the value established above, k can be determined as follows:

K = T

4. From the values established above, S can be calculated as follows:

S = _ uTt_

2693r

5. From all of the above, the lateral radius of influence can be calculated as follows:

r = radius of influence (feet)

Q = production well discharge rate under normal operational conditions (gallons per minute)

S = aquifer storitivity (dimensionless)

t = aquifer transmissivity (gallons per day per foot)

u = is a dimensionless parameter related to well function

W(u) = well function, the well function is calculated and u is obtained from Table A

ho - h = drawdown in the piezometer or observation well

t = time the well is pumped under normal operational conditions (minutes)

Section 671.APPENDIX F Hydrogeologic Mapping

In many unconfined unconsolidated aquifers and unconfined bedrock aquifers, the fixed radius calculated with any of

the previous methods can be supplemented with geologic mapping. A fixed radius could be modified to an irregular

shape where impermeable barrier boundary is encountered within 1,000 feet and beyond the minimum setback.

Hydrogeologic mapping may also include mapping of groundwater levels in order to identify groundwater drainage

divides.

Hydrogeologic mapping is unconfined karst or unconfined fractured bedrock areas may be the primary means of

Title 35 Environmental Protection Agency § 671.Appendix F

Subtitle F Part 671 - 10 August 25, 1988

delineating the lateral radius of influence. It is extremely difficult to define the actual recharge area of a well in a

fractured bedrock setting.

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 11 August 25, 1988

Section 671.TABLE A Well Functions for Confined Aquifers

-10

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-10 22.45 1.00E+10 5.3E-10 20.78 1.89E+09

1.1E-10 22.35 9.09E+09 5.4E-10 20.76 1.85E+09

1.2E-10 22.27 8.33E+09 5.5E-10 20.74 1.82E+09

1.3E-10 22.19 7.69E+09 5.6E-10 20.73 1.79E+09

1.4E-10 22.11 7.14E+09 5.7E-10 20.71 1.75E+09

1.5E-10 22.04 6.67E+09 5.8E-10 20.69 1.72E+09

1.6E-10 21.98 6.25E+09 5.9E-10 20.67 1.69E+09

1.7E-10 21.92 5.88E+09 6.0E-10 20.66 1.67E+09

1.8E-10 21.86 5.56E+09 6.1E-10 20.64 1.64E+09

1.9E-10 21.81 5.26E+09 6.2E-10 20.62 1.61E+09

2.0E-10 21.76 5.00E+09 6.3E-10 20.61 1.59E+09

2.1E-10 21.71 4.76E+09 6.4E-10 20.59 1.56E+09

2.2E-10 21.66 4.55E+09 6.5E-10 20.58 1.54E+09

2.3E-10 21.62 4.35E+09 6.6E-10 20.56 1.52E+09

2.4E-10 21.57 4.17E+09 6.7E-10 20.55 1.49E+09

2.5E-10 21.53 4.00E+09 6.8E-10 20.53 1.47E+09

2.6E-10 21.49 3.85E+09 6.9E-10 20.52 1.45E+09

2.7E-10 21.46 3.70E+09 7.0E-10 20.50 1.43E+09

2.8E-10 21.42 3.57E+09 7.1E-10 20.49 1.41E+09

2.9E-10 21.38 3.45E+09 7.2E-10 20.47 1.39E+09

3.0E-10 21.35 3.33E+09 7.3E-10 20.46 1.37E+09

3.1E-10 21.32 3.23E+09 7.4E-10 20.45 1.35E+09

3.2E-10 21.29 3.13E+09 7.5E-10 20.43 1.33E+09

3.3E-10 21.25 3.03E+09 7.6E-10 20.42 1.32E+09

3.4E-10 21.22 2.94E+09 7.7E-10 20.41 1.30E+09

3.5E-10 21.20 2.86E+09 7.8E-10 20.39 1.28E+09

3.6E-10 21.17 2.78E+09 7.9E-10 20.38 1.27E+09

3.7E-10 21.14 2.70E+09 8.0E-10 20.37 1.25E+09

3.8E-10 21.11 2.63E+09 8.1E-10 20.36 1.23E+09

3.9E-10 21.09 2.56E+09 8.2E-10 20.34 1.22E+09

4.0E-10 21.06 2.50E+09 8.3E-10 20.33 1.20E+09

4.1E-10 21.04 2.44E+09 8.4E-10 20.32 1.19E+09

4.2E-10 21.01 2.38E+09 8.5E-10 20.31 1.18E+09

4.3E-10 20.99 2.33E+09 8.6E-10 20.30 1.16E+09

4.4E-10 20.97 2.27E+09 8.7E-10 20.29 1.15E+09

4.5E-10 20.94 2.22E+09 8.8E-10 20.27 1.14E+09

4.6E-10 20.92 2.17E+09 8.9E-10 20.26 1.12E+09

4.7E-10 20.90 2.13E+09 9.0E-10 20.25 1.11E+09

4.8E-10 20.88 2.08E+09 9.1E-10 20.24 1.10E+09

4.9E-10 20.86 2.04E+09 9.2E-10 20.23 1.09E+09

5.0E-10 20.84 2.00E+09 9.3E-10 20.22 1.08E+09

5.1E-10 20.82 1.96E+09 9.4E-10 20.21 1.06E+09

5.2E-10 20.80 1.92E+09 9.5E-10 20.20 1.05E+09

9.6E-10 20.19 1.04E+09

9.7E-10 20.18 1.03E+09

9.8E-10 20.17 1.02E+09

9.9E-10 20.16 1.01E+09

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 12 August 25, 1988

-9

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-09 20.15 1.00E+09 5.1E-09 18.52 1.96E+08

1.1E-09 20.05 9.09E+08 5.2E-09 18.50 1.92E+08

1.2E-09 19.96 8.33E+08 5.3E-09 18.48 1.89E+08

1.3E-09 19.88 7.69E+08 5.4E-09 18.46 1.85E+08

1.4E-09 19.81 7.14E+08 5.5E-09 18.44 1.82E+08

1.5E-09 19.74 6.67E+08 5.6E-09 18.42 1.79E+08

1.6E-09 19.68 6.25E+08 5.7E-09 18.41 1.75E+08

1.7E-09 19.62 5.88E+08 5.8E-09 18.39 1.72E+08

1.8E-09 19.56 5.56E+08 5.9E-09 18.37 1.69E+08

1.9E-09 19.50 5.26E+08 6.0E-09 18.35 1.67E+08

2.0E-09 19.45 5.00E+08 6.1E-09 18.34 1.64E+08

2.1E-09 19.40 4.76E+08 6.2E-09 18.32 1.61E+08

2.2E-09 19.36 4.55E+08 6.3E-09 18.31 1.59E+08

2.3E-09 19.31 4.35E+08 6.4E-09 18.29 1.56E+08

2.4E-09 19.27 4.17E+08 6.5E-09 18.27 1.54E+08

2.5E-09 19.23 4.00E+08 6.6E-09 18.26 1.52E+08

2.6E-09 19.19 3.85E+08 6.7E-09 18.24 1.49E+08

2.7E-09 19.15 3.70E+08 6.8E-09 18.23 1.47E+08

2.8E-09 19.12 3.57E+08 6.9E-09 18.21 1.45E+08

2.9E-09 19.08 3.45E+08 7.0E-09 18.20 1.43E+08

3.0E-09 19.05 3.33E+08 7.1E-09 18.19 1.41E+08

3.1E-09 19.01 3.23E+08 7.2E-09 18.17 1.39E+08

3.2E-09 18.98 3.13E+08 7.3E-09 18.16 1.37E+08

3.3E-09 18.95 3.03E+08 7.4E-09 18.14 1.35E+08

3.4E-09 18.92 2.94E+08 7.5E-09 18.13 1.33E+08

3.5E-09 18.89 2.86E+08 7.6E-09 18.12 1.32E+08

3.6E-09 18.87 2.78E+08 7.7E-09 18.10 1.30E+08

3.7E-09 18.84 2.70E+08 7.8E-09 18.09 1.28E+08

3.8E-09 18.81 2.63E+08 7.9E-09 18.08 1.27E+08

3.9E-09 18.79 2.56E+08 8.0E-09 18.07 1.25E+08

4.0E-09 18.76 2.50E+08 8.1E-09 18.05 1.23E+08

4.1E-09 18.74 2.44E+08 8.2E-09 18.04 1.22E+08

4.2E-09 18.71 2.38E+08 8.3E-09 18.03 1.20E+08

4.3E-09 18.69 2.33E+08 8.4E-09 18.02 1.19E+08

4.4E-09 18.66 2.27E+08 8.5E-09 18.01 1.18E+08

4.5E-09 18.64 2.22E+08 8.6E-09 17.99 1.16E+08

4.6E-09 18.62 2.17E+08 8.7E-09 17.98 1.15E+08

4.7E-09 18.60 2.13E+08 8.8E-09 17.97 1.14E+08

4.8E-09 18.58 2.08E+08 8.9E-09 17.96 1.12E+08

4.9E-09 18.56 2.04E+08 9.0E-09 17.95 1.11E+08

5.0E-09 18.54 2.00E+08 9.1E-09 17.94 1.10E+08

9.2E-09 17.93 1.09E+08

9.3E-09 17.92 1.08E+08

9.4E-09 17.91 1.06E+08

9.5E-09 17.89 1.05E+08

9.6E-09 17.88 1.04E+08

9.7E-09 17.87 1.03E+08

9.8E-09 17.86 1.02E+08

9.9E-09 17.85 1.01E+08

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 13 August 25, 1988

-8

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-08 17.84 1.00E+08 5.1E-08 16.21 1.96E+07

1.1E-08 17.75 9.09E+07 5.2E-08 16.19 1.92E+07

1.2E-08 17.66 8.33E+07 5.3E-08 16.18 1.89E+07

1.3E-08 17.58 7.69E+07 5.4E-08 16.16 1.85E+07

1.4E-08 17.51 7.14E+07 5.5E-08 16.14 1.82E+07

1.5E-08 17.44 6.67E+07 5.6E-08 16.12 1.79E+07

1.6E-08 17.37 6.25E+07 5.7E-08 16.10 1.75E+07

1.7E-08 17.31 5.88E+07 5.8E-08 16.09 1.72E+07

1.8E-08 17.26 5.56E+07 5.9E-08 16.07 1.69E+07

1.9E-08 17.20 5.26E+07 6.0E-08 16.05 1.67E+07

2.0E-08 17.15 5.00E+07 6.1E-08 16.04 1.64E+07

2.1E-08 17.10 4.76E+07 6.2E-08 16.02 1.61E+07

2.2E-08 17.06 4.55E+07 6.3E-08 16.00 1.59E+07

2.3E-08 17.01 4.35E+07 6.4E-08 15.99 1.56E+07

2.4E-08 16.97 4.17E+07 6.5E-08 15.97 1.54E+07

2.5E-08 16.93 4.00E+07 6.6E-08 15.96 1.52E+07

2.6E-08 16.89 3.85E+07 6.7E-08 15.94 1.49E+07

2.7E-08 16.85 3.70E+07 6.8E-08 15.93 1.47E+07

2.8E-08 16.81 3.57E+07 6.9E-08 15.91 1.45E+07

2.9E-08 16.78 3.45E+07 7.0E-08 15.90 1.43E+07

3.0E-08 16.74 3.33E+07 7.1E-08 15.88 1.41E+07

3.1E-08 16.71 3.23E+07 7.2E-08 15.87 1.39E+07

3.2E-08 16.68 3.13E+07 7.3E-08 15.86 1.37E+07

3.3E-08 16.65 3.03E+07 7.4E-08 15.84 1.35E+07

3.4E-08 16.62 2.94E+07 7.5E-08 15.83 1.33E+07

3.5E-08 16.59 2.86E+07 7.6E-08 15.82 1.32E+07

3.6E-08 16.56 2.78E+07 7.7E-08 15.80 1.30E+07

3.7E-08 16.54 2.70E+07 7.8E-08 15.79 1.28E+07

3.8E-08 16.51 2.63E+07 7.9E-08 15.78 1.27E+07

3.9E-09 16.48 2.56E+07 8.0E-08 15.76 1.25E+07

4.0E-08 16.46 2.50E+07 8.1E-08 15.75 1.23E+07

4.1E-08 16.43 2.44E+07 8.2E-08 15.74 1.22E+07

4.2E-08 16.41 2.38E+07 8.3E-08 15.73 1.20E+07

4.3E-08 16.38 2.33E+07 8.4E-08 15.72 1.19E+07

4.4E-08 16.36 2.27E+07 8.5E-08 15.70 1.18E+07

4.5E-08 16.34 2.22E+07 8.6E-08 15.69 1.16E+07

4.6E-08 16.32 2.17E+07 8.7E-08 15.68 1.15E+07

4.7E-08 16.30 2.13E+07 8.8E-08 15.67 1.14E-07

4.8E-08 16.27 2.08E+07 8.9E-08 15.66 1.12E+07

4.9E-08 16.25 2.04E+07 9.0E-08 15.65 1.11E+07

5.0E-08 16.23 2.00E+07 9.1E-08 15.64 1.10E+07

9.2E-08 15.62 1.09E+07

9.3E-08 15.61 1.08E+07

9.4E-08 15.60 1.06E+07

9.5E-08 15.59 1.05E+07

9.6E-08 15.58 1.04E+07

9.7E-08 15.57 1.03E+07

9.8E-08 15.56 1.02E+07

9.9E-08 15.55 1.01E+07

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 14 August 25, 1988

-7

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-07 15.54 1.00E+07 5.1E-07 13.91 1.96E+06

1.1E-07 15.45 9.09E+06 5.2E-07 13.89 1.92E+06

1.2E-07 15.36 8.33E+06 5.3E-07 13.87 1.89E+06

1.3E-07 15.28 7.69E+06 5.4E-07 13.85 1.85E+06

1.4E-07 15.20 7.14E+06 5.5E-07 13.84 1.82E+06

1.5E-07 15.14 6.67E+06 5.6E-07 13.82 1.79E+06

1.6E-07 15.07 6.25E+06 5.7E-07 13.80 1.75E+06

1.7E-07 15.01 5.88E+06 5.8E-07 13.78 1.72E+06

1.8E-07 14.95 5.56E+06 5.9E-07 13.77 1.69E+06

1.9E-07 14.90 5.26E+06 6.0E-07 13.75 1.67E+06

2.0E-07 14.85 5.00E+06 6.1E-07 13.73 1.64E+06

2.1E-07 14.80 4.76E+06 6.2E-07 13.72 1.61E+06

2.2E-07 14.75 4.55E+06 6.3E-07 13.70 1.59E+06

2.3E-07 14.71 4.35E+06 6.4E-07 13.68 1.56E+06

2.4E-07 14.67 4.17E+06 6.5E-07 13.67 1.54E+06

2.5E-07 14.62 4.00E+06 6.6E-07 13.65 1.52E+06

2.6E-07 14.59 3.85E+06 6.7E-07 13.64 1.49E+06

2.7E-07 14.55 3.70E+06 6.8E-07 13.62 1.47E+06

2.8E-07 14.51 3.57E+06 6.9E-07 13.61 1.45E+06

2.9E-07 14.48 3.45E+06 7.0E-07 13.59 1.43E+06

3.0E-07 14.44 3.33E+06 7.1E-07 13.58 1.41E+06

3.1E-07 14.41 3.23E+06 7.2E-07 13.57 1.39E+06

3.2E-07 14.38 3.13E+06 7.3E-07 13.55 1.37E+06

3.3E-07 14.35 3.03E+06 7.4E-07 13.54 1.35E+06

3.4E-07 14.32 2.94E+06 7.5E-07 13.53 1.33E+06

3.5E-07 14.29 2.86E+06 7.6E-07 13.51 1.32E+06

3.6E-07 14.26 2.78E+06 7.7E-07 13.50 1.30E+06

3.7E-07 14.23 2.70E+06 7.8E-07 13.49 1.28E+06

3.8E-07 14.21 2.63E+06 7.9E-07 13.47 1.27E+06

3.9E-07 14.18 2.56E+06 8.0E-07 13.46 1.25E+06

4.0E-07 14.15 2.50E+06 8.1E-07 13.45 1.23E+06

4.1E-07 14.13 2.44E+06 8.2E-07 13.44 1.22E+06

4.2E-07 14.11 2.38E+06 8.3E-07 13.42 1.20E+06

4.3E-07 14.08 2.33E+06 8.4E-07 13.41 1.19E+06

4.4E-07 14.06 2.27E+06 8.5E-07 13.40 1.18E+06

4.5E-07 14.04 2.22E+06 8.6E-07 13.39 1.16E+06

4.6E-07 14.01 2.17E+06 8.7E-07 13.38 1.15E+06

4.7E-07 13.99 2.13E+06 8.8E-07 13.37 1.14E+06

4.8E-07 13.97 2.08E+06 8.9E-07 13.35 1.12E+06

4.9E-07 13.95 2.04E+06 9.0E-07 13.34 1.11E+06

5.0E-07 13.93 2.00E+06 9.1E-07 13.33 1.10E+06

9.2E-07 13.32 1.09E+06

9.3E-07 13.31 1.08E+06

9.4E-07 13.30 1.06E+06

9.5E-07 13.29 1.05E+06

9.6E-07 13.28 1.04E+06

9.7E-07 13.27 1.03E+06

9.8E-07 13.26 1.02E+06

9.9E-07 13.25 1.01E+06

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 15 August 25, 1988

-6

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-06 13.24 1.00E+06 5.1E-06 11.61 1.96E+05

1.1E-06 13.14 9.09E+05 5.2E-06 11.59 1.92E+05

1.2E-06 13.06 8.33E+05 5.3E-06 11.57 1.89E+05

1.3E-06 12.98 7.69E+05 5.4E-06 11.55 1.85E+05

1.4E-06 12.90 7.14E+05 5.5E-06 11.53 1.82E+05

1.5E-06 12.83 6.67E+05 5.6E-06 11.52 1.79E+05

1.6E-06 12.77 6.25E+05 5.7E-06 11.50 1.75E+05

1.7E-06 12.71 5.88E+05 5.8E-06 11.48 1.72E+05

1.8E-06 12.65 5.56E+05 5.9E-06 11.46 1.69E+05

1.9E-06 12.60 5.26E+05 6.0E-06 11.45 1.67E+05

2.0E-06 12.55 5.00E+05 6.1E-06 11.43 1.64E+05

2.1E-06 12.50 4.76E+05 6.2E-06 11.41 1.61E+05

2.2E-06 12.45 4.55E+05 6.3E-06 11.40 1.59E+05

2.3E-06 12.41 4.35E+05 6.4E-06 11.38 1.56E+05

2.4E-06 12.36 4.17E+05 6.5E-06 11.37 1.54E+05

2.5E-06 12.32 4.00E+05 6.6E-06 11.35 1.52E+05

2.6E-06 12.28 3.85E+05 6.7E-06 11.34 1.49E+05

2.7E-06 12.25 3.70E+05 6.8E-06 11.32 1.47E+05

2.8E-06 12.21 3.57E+05 6.9E-06 11.31 1.45E+05

2.9E-06 12.17 3.45E+05 7.0E-06 11.29 1.43E+05

3.0E-06 12.14 3.33E+05 7.1E-06 11.28 1.41E+05

3.1E-06 12.11 3.23E+05 7.2E-06 11.26 1.39E+05

3.2E-06 12.08 3.13E+05 7.3E-06 11.25 1.37E+05

3.3E-06 12.04 3.03E+05 7.4E-06 11.24 1.35E+05

3.4E-06 12.01 2.94E+05 7.5E-06 11.22 1.33E+05

3.5E-06 11.99 2.86E+05 7.6E-06 11.21 1.32E+05

3.6E-06 11.96 2.78E+05 7.7E-06 11.20 1.30E+05

3.7E-06 11.93 2.70E+05 7.8E-06 11.18 1.28E+05

3.8E-06 11.90 2.63E+05 7.9E-06 11.17 1.27E+05

3.9E-06 11.88 2.56E+05 8.0E-06 11.16 1.25E+05

4.0E-06 11.85 2.50E+05 8.1E-06 11.15 1.23E+05

4.1E-06 11.83 2.44E+05 8.2E-06 11.13 1.22E+05

4.2E-06 11.80 2.38E+05 8.3E-06 11.12 1.20E+05

4.3E-06 11.78 2.33E+05 8.4E-06 11.11 1.19E+05

4.4E-06 11.76 2.27E+05 8.5E-06 11.10 1.18E+05

4.5E-06 11.73 2.22E+05 8.6E-06 11.09 1.16E+05

4.6E-06 11.71 2.17E+05 8.7E-06 11.07 1.15E+05

4.7E-06 11.69 2.13E+05 8.8E-06 11.06 1.14E+05

4.8E-06 11.67 2.08E+05 8.9E-06 11.05 1.12E+05

4.9E-06 11.65 2.04E+05 9.0E-06 11.04 1.11E+05

5.0E-06 11.63 2.00E+05 9.1E-06 11.03 1.10E+05

9.2E-06 11.02 1.09E+05

9.3E-06 11.01 1.08E+05

9.4E-06 11.00 1.06E+05

9.5E-06 10.99 1.05E+05

9.6E-06 10.98 1.04E+05

9.7E-06 10.97 1.03E+05

9.8E-06 10.96 1.02E+05

9.9E-06 10.95 1.01E+05

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 16 August 25, 1988

-5

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-05 10.94 1.00E+05 5.1E-05 9.31 1.96E+04

1.1E-05 10.84 9.09E+04 5.2E-05 9.29 1.92E+04

1.2E-05 10.75 8.33E+04 5.3E-05 9.27 1.89E+04

1.3E-05 10.67 7.69E+04 5.4E-05 9.25 1.85E+04

1.4E-05 10.60 7.14E+04 5.5E-05 9.23 1.82E+04

1.5E-05 10.53 6.67E+04 5.6E-05 9.21 1.79E+04

1.6E-05 10.47 6.25E+04 5.7E-05 9.20 1.75E+04

1.7E-05 10.41 5.88E+04 5.8E-05 9.18 1.72E+04

1.8E-05 10.35 5.56E+04 5.9E-05 9.16 1.69E+04

1.9E-05 10.29 5.26E+04 6.0E-05 9.14 1.67E+04

2.0E-05 10.24 5.00E+04 6.1E-05 9.13 1.64E+04

2.1E-05 10.19 4.76E+04 6.2E-05 9.11 1.61E+04

2.2E-05 10.15 4.55E+04 6.3E-05 9.10 1.59E+04

2.3E-05 10.10 4.35E+04 6.4E-05 9.08 1.56E+04

2.4E-05 10.06 4.17E+04 6.5E-05 9.06 1.54E+04

2.5E-05 10.02 4.00E+04 6.6E-05 9.05 1.52E+04

2.6E-05 9.98 3.85E+04 6.7E-05 9.03 1.49E+04

2.7E-05 9.94 3.70E+04 6.8E-05 9.02 1.47E+04

2.8E-05 9.91 3.57E+04 6.9E-05 9.00 1.45E+04

2.9E-05 9.87 3.45E+04 7.0E-05 8.99 1.43E+04

3.0E-05 9.84 3.33E+04 7.1E-05 8.98 1.41E+04

3.1E-05 9.80 3.23E+04 7.2E-05 8.96 1.39E+04

3.2E-05 9.77 3.13E+04 7.3E-05 8.95 1.37E+04

3.3E-05 9.74 3.03E+04 7.4E-05 8.93 1.35E+04

3.4E-05 9.71 2.94E+04 7.5E-05 8.92 1.33E+04

3.5E-05 9.68 2.86E+04 7.6E-05 8.91 1.32E+04

3.6E-05 9.65 2.78E+04 7.7E-05 8.89 1.30E+04

3.7E-05 9.63 2.70E+04 7.8E-05 8.88 1.28E+04

3.8E-05 9.60 2.63E+04 7.9E-05 8.87 1.27E+04

3.9E-05 9.57 2.56E+04 8.0E-05 8.86 1.25E+04

4.0E-05 9.55 2.50E+04 8.1E-05 8.84 1.23E+04

4.1E-05 9.52 2.44E+04 8.2E-05 8.83 1.22E+04

4.2E-05 9.50 2.38E+04 8.3E-05 8.82 1.20E+04

4.3E-05 9.48 2.33E+04 8.4E-05 8.81 1.19E+04

4.4E-05 9.45 2.27E+04 8.5E-05 8.80 1.18E+04

4.5E-05 9.43 2.22E+04 8.6E-05 8.78 1.16E+04

4.6E-05 9.41 2.17E+04 8.7E-05 8.77 1.15E+04

4.7E-05 9.39 2.13E+04 8.8E-05 8.76 1.14E+04

4.8E-05 9.37 2.08E+04 8.9E-05 8.75 1.12E+04

4.9E-05 9.35 2.04E+04 9.0E-05 8.74 1.11E+04

5.0E-05 9.33 2.00E+04 9.1E-05 8.73 1.10E+04

9.2E-05 8.72 1.09E+04

9.3E-05 8.71 1.08E+04

9.4E-05 8.70 1.06E+04

9.5E-05 8.68 1.05E+04

9.6E-05 8.67 1.04E+04

9.7E-05 8.66 1.03E+04

9.8E-05 8.65 1.02E+04

9.9E-05 8.64 1.01E+04

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 17 August 25, 1988

-4

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-04 8.63 1.00E+04 5.1E-04 7.00 1.96E+03

1.1E-04 8.54 9.09E+03 5.2E-04 6.98 1.92E+03

1.2E-04 8.45 8.33E+03 5.3E-04 6.97 1.89E+03

1.3E-04 8.37 7.69E+03 5.4E-04 6.95 1.85E+03

1.4E-04 8.30 7.14E+03 5.5E-04 6.93 1.82E+03

1.5E-04 8.23 6.67E+03 5.6E-04 6.91 1.79E+03

1.6E-04 8.16 6.25E+03 5.7E-04 6.89 1.75E+03

1.7E-04 8.10 5.88E+03 5.8E-04 6.88 1.72E+03

1.8E-04 8.05 5.56E+03 5.9E-04 6.86 1.69E+03

1.9E-04 7.99 5.26E+03 6.0E-04 6.84 1.67E+03

2.0E-04 7.94 5.00E+03 6.1E-04 6.83 1.64E+03

2.1E-04 7.89 4.76E+03 6.2E-04 6.81 1.61E+03

2.2E-04 7.84 4.55E+03 6.3E-04 6.79 1.59E+03

2.3E-04 7.80 4.35E+03 6.4E-04 6.78 1.56E+03

2.4E-04 7.76 4.17E+03 6.5E-04 6.76 1.54E+03

2.5E-04 7.72 4.00E+03 6.6E-04 6.75 1.52E+03

2.6E-04 7.68 3.85E+03 6.7E-04 6.73 1.49E+03

2.7E-04 7.64 3.70E+03 6.8E-04 6.72 1.47E+03

2.8E-04 7.60 3.57E+03 6.9E-04 6.70 1.45E+03

2.9E-04 7.57 3.45E+03 7.0E-04 6.69 1.43E+03

3.0E-04 7.53 3.33E+03 7.1E-04 6.67 1.41E+03

3.1E-04 7.50 3.23E+03 7.2E-04 6.66 1.39E+03

3.2E-04 7.47 3.13E+03 7.3E-04 6.65 1.37E+03

3.3E-04 7.44 3.03E+03 7.4E-04 6.63 1.35E+03

3.4E-04 7.41 2.94E+03 7.5E-04 6.62 1.33E+03

3.5E-04 7.38 2.86E+03 7.6E-04 6.61 1.32E+03

3.6E-04 7.35 2.78E+03 7.7E-04 6.59 1.30E+03

3.7E-04 7.33 2.70E=03 7.8E-04 6.58 1.28E+03

3.8E-04 7.30 2.63E+03 7.9E-04 6.57 1.27E+03

3.9E-04 7.27 2.56E+03 8.0E-04 6.55 1.25E+03

4.0E-04 7.25 2.50E+03 8.1E-04 6.54 1.23E+03

4.1E-04 7.22 2.44E+03 8.2E-04 6.53 1.22E+03

4.2E-04 7.20 2.38E+03 8.3E-04 6.52 1.20E+03

4.3E-04 7.17 2.33E+03 8.4E-04 6.51 1.19E+03

4.4E-04 7.15 2.27E+03 8.5E-04 6.49 1.18E+03

4.5E-04 7.13 2.22E+03 8.6E-04 6.48 1.16E+03

4.6E-04 7.11 2.17E+03 8.7E-04 6.47 1.15E+03

4.7E-04 7.09 2.13E+03 8.8E-04 6.46 1.14E+03

4.8E-04 7.06 2.08E+03 8.9E-04 6.45 1.12E+03

4.9E-04 7.04 2.04E+03 9.0E-04 6.44 1.11E+03

5.0E-04 7.02 2.00E+03 9.1E-04 6.43 1.10E+03

9.2E-04 6.41 1.09E+03

9.3E-04 6.40 1.08E+03

9.4E-04 6.39 1.06E+03

9.5E-04 6.38 1.05E+03

9.6E-04 6.37 1.04E+03

9.7E-04 6.36 1.03E+03

9.8E-04 6.35 1.02E+03

9.9E-04 6.34 1.01E+03

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 18 August 25, 1988

-3

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-03 6.33 1.00E+03 5.1E-03 4.71 1.96E+02

1.1E-03 6.24 9.09E+02 5.2E-03 4.69 1.92E+02

1.2E-03 6.15 8.33E+02 5.3E-03 4.67 1.89E+02

1.3E-03 6.07 7.69E+02 5.4E-03 4.65 1.85E+02

1.4E-03 6.00 7.14E+02 5.5E-03 4.63 1.82E+02

1.5E-03 5.93 6.67E+02 5.6E-03 4.61 1.79E+02

1.6E-03 5.86 6.25E+02 5.7E-03 4.60 1.75E+02

1.7E-03 5.80 5.88E+02 5.8E-03 4.58 1.72E+02

1.8E-03 5.74 5.56E+02 5.9E-03 4.56 1.69E+02

1.9E-03 5.69 5.26E+02 6.0E-03 4.54 1.67E+02

2.0E-03 5.64 5.00E+02 6.1E-03 4.53 1.64E+02

2.1E-03 5.59 4.76E+02 6.2E-03 4.51 1.61E+02

2.2E-03 5.54 4.55E+02 6.3E-03 4.50 1.59E+02

2.3E-03 5.50 4.35E+02 6.4E-03 4.48 1.56E+02

2.4E-03 5.46 4.17E+02 6.5E-03 4.47 1.54E+02

2.5E-03 5.42 4.00E+02 6.6E-03 4.45 1.52E+02

2.6E-03 5.38 3.85E+02 6.7E-03 4.44 1.49E+02

2.7E-03 5.34 3.70E+02 6.8E-03 4.42 1.47E+02

2.8E-03 5.30 3.57E+02 6.9E-03 4.41 1.45E+02

2.9E-03 5.27 3.45E+02 7.0E-03 4.39 1.43E+02

3.0E-03 5.23 3.33E+02 7.1E-03 4.38 1.41E+02

3.1E-03 5.20 3.23E+02 7.2E-03 4.36 1.39E+02

3.2E-03 5.17 3.13E+02 7.3E-03 4.35 1.37E+02

3.3E-03 5.14 3.03E+02 7.4E-03 4.34 1.35E+02

3.4E-03 5.11 2.94E+02 7.5E-03 4.32 1.33E+02

3.5E-03 5.08 2.86E+02 7.6E-03 4.31 1.32E+02

3.6E-03 5.05 2.78E+02 7.7E-03 4.30 1.30E+02

3.7E-03 5.03 2.70E+02 7.8E-03 4.28 1.28E+02

3.8E-03 5.00 2.63E+02 7.9E-03 4.27 1.27E+02

3.9E-03 4.97 2.56E+02 8.0E-03 4.26 1.25E+02

4.0E-03 4.95 2.50E+02 8.1E-03 4.25 1.23E+02

4.1E-03 4.92 2.44E+02 8.2E-03 4.23 1.22E+02

4.2E-03 4.90 2.38E+02 8.3E-03 4.22 1.20E+02

4.3E-03 4.88 2.33E+02 8.4E-03 4.21 1.19E+02

4.4E-03 4.85 2.27E+02 8.5E-03 4.20 1.18E+02

4.5E-03 4.83 2.22E+02 8.6E-03 4.19 1.16E+02

4.6E-03 4.81 2.17E+02 8.7E-03 4.18 1.15E+02

4.7E-03 4.79 2.13E+02 8.8E-03 4.16 1.14E+02

4.8E-03 4.77 2.08E+02 8.9E-03 4.15 1.12E+02

4.9E-03 4.75 2.04E+02 9.0E-03 4.14 1.11E+02

5.0E-03 4.73 2.00E+02 9.1E-03 4.13 1.10E+02

9.2E-03 4.12 1.09E+02

9.3E-03 4.11 1.08E+02

9.4E-03 4.10 1.06E+02

9.5E-03 4.09 1.05E+02

9.6E-03 4.08 1.04E+02

9.7E-03 4.07 1.03E+02

9.8E-03 4.06 1.02E+02

9.9E-03 4.05 1.01E+02

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 19 August 25, 1988

-2

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-02 4.04 1.00E+02 5.1E-02 2.45 1.96E+01

1.1E-02 3.94 9.09E+01 5.2E-02 2.43 1.92E+01

1.2E-02 3.86 8.33E+01 5.3E-02 2.41 1.89E+01

1.3E-02 3.78 7.69E+01 5.4E-02 2.39 1.85E+01

1.4E-02 3.71 7.14E+01 5.5E-02 2.38 1.82E+01

1.5E-02 3.64 6.67E+01 5.6E-02 2.36 1.79E+01

1.6E-02 3.57 6.25E+01 5.7E-02 2.34 1.75E+01

1.7E-02 3.51 5.88E+01 5.8E-02 2.33 1.72E+01

1.8E-02 3.46 5.56E+01 5.9E-02 2.31 1.69E+01

1.9E-02 3.41 5.26E+01 6.0E-02 2.30 1.67E+01

2.0E-02 3.35 5.00E+01 6.1E-02 2.28 1.64E+01

2.1E-02 3.31 4.76E+01 6.2E-02 2.26 1.61E+01

2.2E-02 3.26 4.55E+01 6.3E-02 2.25 1.59E+01

2.3E-02 3.22 4.35E+01 6.4E-02 2.23 1.56E+01

2.4E-02 3.18 4.17E+01 6.5E-02 2.22 1.54E+01

2.5E-02 3.14 4.00E+01 6.6E-02 2.21 1.52E+01

2.6E-02 3.10 3.85E+01 6.7E-02 2.19 1.49E+01

2.7E-02 3.06 3.70E+01 6.8E-02 2.18 1.47E+01

2.8E-02 3.03 3.57E+01 6.9E-02 2.16 1.45E+01

2.9E-02 2.99 3.45E+01 7.0E-02 2.15 1.43E+01

3.0E-02 2.96 3.33E+01 7.1E-02 2.14 1.41E+01

3.1E-02 2.93 3.23E+01 7.2E-02 2.12 1.39E+01

3.2E-02 2.90 3.13E+01 7.3E-02 2.11 1.37E+01

3.3E-02 2.87 3.03E+01 7.4E-02 2.10 1.35E+01

3.4E-02 2.84 2.94E+01 7.5E-02 2.09 1.33E+01

3.5E-02 2.81 2.86E+01 7.6E-02 2.07 1.32E+01

3.6E-02 2.78 2.78E+01 7.7E-02 2.06 1.30E+01

3.7E-02 2.76 2.70E+01 7.8E-02 2.05 1.28E+01

3.8E-02 2.73 2.63E+01 7.9E-02 2.04 1.27E+01

3.9E-02 2.71 2.56E+01 8.0E-02 2.03 1.25E+01

4.0E-02 2.68 2.50E+01 8.1E-02 2.02 1.23E+01

4.1E-02 2.66 2.44E+01 8.2E-02 2.00 1.22E+01

4.2E-02 2.63 2.38E+01 8.3E-02 1.993 1.20E+01

4.3E-02 2.61 2.33E+01 8.4E-02 1.982 1.19E+01

4.4E-02 2.59 2.27E+01 8.5E-02 1.971 1.18E+01

4.5E-02 2.57 2.22E+01 8.6E-02 1.960 1.16E+01

4.6E-02 2.55 2.17E+01 8.7E-02 1.950 1.15E+01

4.7E-02 2.53 2.13E+01 8.8E-02 1.939 1.14E+01

4.8E-02 2.51 2.08E+01 8.9E-02 1.929 1.12E+01

4.9E-02 2.49 2.04E+01 9.0E-02 1.919 1.11E+01

5.0E-02 2.47 2.00E+01 9.1E-02 1.909 1.10E+01

9.2E-02 1.899 1.09E+01

9.3E-02 1.889 1.08E+01

9.4E-02 1.879 1.06E+01

9.5E-02 1.869 1.05E+01

9.6E-02 1.860 1.04E+01

9.7E-02 1.851 1.03E+01

9.8E-02 1.841 1.02E+01

9.9E-02 1.832 1.01E+01

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 20 August 25, 1988

-1

Well Functions

U W(U) 1/U U W(U) 1/U

1.0E-01 1.823 1.00E+01 5.1E-01 0.548 1.96E+00

1.1E-01 1.737 9.09E+00 5.2E-01 0.536 1.92E+00

1.2E-01 1.660 8.33E+00 5.3E-01 0.525 1.89E+00

1.3E-01 1.589 7.69E+00 5.4E-01 0.514 1.85E+00

1.4E-01 1.524 7.14E+00 5.5E-01 0.503 1.82E+00

1.5E-01 1.464 6.67E+00 5.6E-01 0.493 1.79E+00

1.6E-01 1.409 6.25E+00 5.7E-01 0.483 1.75E+00

1.7E-01 1.358 5.88E+00 5.8E-01 0.473 1.72E+00

1.8E-01 1.310 5.56E+00 5.9E-01 0.464 1.69E+00

1.9E-01 1.265 5.26E+00 6.0E-01 0.454 1.67E+00

2.0E-01 1.223 5.00E+00 6.1E-01 0.445 1.64E+00

2.1E-01 1.183 4.76E+00 6.2E-01 0.437 1.61E+00

2.2E-01 1.145 4.55E+00 6.3E-01 0.428 1.59E+00

2.3E-01 1.110 4.35E+00 6.4E-01 0.420 1.56E+00

2.4E-01 1.076 4.17E+00 6.5E-01 0.412 1.54E+00

2.5E-01 1.044 4.00E+00 6.6E-01 0.404 1.52E+00

2.6E-01 1.014 3.85E+00 6.7E-01 0.396 1.49E+00

2.7E-01 0.985 3.70E+00 6.8E-01 0.388 1.47E+00

2.8E-01 0.957 3.57E+00 6.9E-01 0.381 1.45E+00

2.9E-01 0.931 3.45E+00 7.0E-01 0.374 1.43E+00

3.0E-01 0.906 3.33E+00 7.1E-01 0.367 1.41E+00

3.1E-01 0.882 3.23E+00 7.2E-01 0.360 1.39E+00

3.2E-01 0.858 3.13E+00 7.3E-01 0.353 1.37E+00

3.3E-01 0.836 3.03E+00 7.4E-01 0.347 1.35E+00

3.4E-01 0.815 2.94E+00 7.5E-01 0.340 1.33E+00

3.5E-01 0.794 2.86E+00 7.6E-01 0.334 1.32E+00

3.6E-01 0.774 2.78E+00 7.7E-01 0.328 1.30E+00

3.7E-01 0.755 2.70E+00 7.8E-01 0.322 1.28E+00

3.8E-01 0.737 2.63E+00 7.9E-01 0.316 1.27E+00

3.9E-01 0.719 2.56E+00 8.0E-01 0.311 1.25E+00

4.0E-01 0.702 2.50E+00 8.1E-01 0.305 1.23E+00

4.1E-01 0.686 2.44E+00 8.2E-01 0.300 1.22E+00

4.2E-01 0.670 2.38E+00 8.3E-01 0.294 1.20E+00

4.3E-01 0.655 2.33E+00 8.4E-01 0.289 1.19E+00

4.4E-01 0.640 2.27E+00 8.5E-01 0.284 1.18E+00

4.5E-01 0.625 2.22E+00 8.6E-01 0.279 1.16E+00

4.6E-01 0.611 2.17E+00 8.7E-01 0.274 1.15E+00

4.7E-01 0.598 2.13E+00 8.8E-01 0.269 1.14E+00

4.8E-01 0.585 2.08E+00 8.9E-01 0.265 1.12E+00

4.9E-01 0.572 2.04E+00 9.0E-01 0.260 1.11E+00

5.0E-01 0.560 2.00E+00 9.1E-01 0.256 1.10E+00

9.2E-01 0.251 1.09E+00

9.3E-01 0.247 1.08E+00

9.4E-01 0.243 1.06E+00

9.5E-01 0.239 1.05E+00

9.6E-01 0.235 1.04E+00

9.7E-01 0.231 1.03E+00

9.8E-01 0.227 1.02E+00

9.9E-01 0.223 1.01E+00

Title 35 Environmental Protection Agency § 671.Table A

Subtitle F Part 671 - 21 August 25, 1988

10 Well Functions

W(U) 1/U

1.0E+00 0.219 1.00E+00

1.1E+00 0.186 9.09E-01

1.2E+00 0.158 8.33E-01

1.3E+00 0.135 7.69E-01

1.4E+00 0.116 7.14E-01

1.5E+00 0.100 6.67E-01

1.6E+00 0.086 6.25E-01

1.7E+00 0.075 5.88E-01

1.8E+00 0.065 5.56E-01

1.9E+00 0.056 5.26E-01

2.0E+00 0.049 5.00E-01

2.1E+00 0.043 4.76E-01

2.2E+00 0.037 4.55E-01

2.3E+00 0.033 4.35E-01

2.4E+00 0.028 4.17E-01

2.5E+00 0.025 4.00E-01

2.6E+00 0.022 3.85E-01

2.7E+00 0.019 3.70E-01

2.8E+00 0.017 3.57E-01

2.9E+00 0.015 3.45E-01

3.0E+00 0.013 3.33E-01

3.1E+00 0.011 3.23E-01

3.2E+00 0.010 3.13E-01

3.3E+00 0.009 3.03E-01

3.4E+00 0.008 2.94E-01

3.5E+00 0.007 2.86E-01

3.6E+00 0.006 2.78E-01

3.7E+00 0.005 2.70E-01

3.8E+00 0.005 2.63E-01

3.9E+00 0.004 2.56E-01

4.0E+00 0.004 2.50E-01

4.1E+00 0.003 2.44E-01

4.2E+00 0.003 2.38E-01

4.3E+00 0.003 2.33E-01

4.4E+00 0.002 2.27E-01

4.5E+00 0.002 2.22E-01

4.6E+00 0.002 2.17E-01

4.7E+00 0.002 2.13E-01

4.8E+00 0.001 2.08E-01

4.9E+00 0.001 2.04E-01

5.0E+00 0.001 2.00E-01

TITLE 35 ENVIRONMENTAL PROTECTION AGENCY

'

671.TABLE B

Subtitle F Part 671 - 22 August 25, 1988

Section 671.TABLE B Well Functions for Unconfined or Water Table Aquifers

1/uA

? = 0.001 ? = 0.01 ? = 0.06 ? = 0.2 ? = 0.6 ? = 1.0 ? = 2.0 ? = 4.0

SOURCE: Adapted from S. P. Neuman, Water Resources Research, 11(1975): 329-42.

TITLE 35 ENVIRONMENTAL PROTECTION AGENCY

'

671.TABLE B

Subtitle F Part 671 - 23 August 25, 1988

ERATTA SHEET

REVISIONS to:

TITLE 35: ENVIRONMENTAL PROTECTION

SUBTITLE F: PUBLIC WATER SUPPLIES

CHAPTER II: ENVIRONMENTAL PROTECTION AGENCY

PART 671

MAXIMUM SETBACK ZONE FOR COMMUNITY WATER SUPPLY WELLS

SUBPART A: INTRODUCTION

Section 671.104 Agency Mailing Address

Each request, report, notice, or other document submitted to the Agency under this Part shall be mailed to

the following address:

Manager, Groundwater Section

Division of Public Water Supplies

Illinois Environmental Protection Agency

1021 North Grand Avenue East 2200 Churchill Road

Post Office Box 19276

Springfield, Illinois 62794-9276

SUBPART B: PROCEDURES FOR DETERMINING THE LATERAL AREA OF INFLUENCE OFWELLS

UNDER NORMAL OPERATIONAL CONDITIONS

Section 671.APPENDIX E Theis Equations and Pump Test Procedures for Confined Aquifers

PROCEDURE

The Theis type curve is used. The type curve is used to evaluate field data for time and drawdown,

which are plotted on logarithmic paper of the same scale. The following procedure can be used:…

5. From all of the above, the lateral radius of influence can be calculated as follows:

_______

uTt__

s = 2693S

Where: The Theis type curve is used. The type curve is used to evaluate field data for time and

drawdown, which are plotted on logarithmic paper of the same scale. The following procedure can be

used:

r = radius of influence (feet)

Q = production well discharge rate under normal operational conditions (gallons per minute)

S = aquifer storitivity (dimensionless)

T t = aquifer transmissivity (gallons per day per foot)

u = is a dimensionless parameter related to well function

W(u) = well function, the well function is calculated and u is obtained from Table A

ho - h = drawdown in the piezometer or observation well

t = time the well is pumped under normal operational conditions (minutes)