HomeMy WebLinkAbout7C, Final Draft of I&I Report
~
~~HILLS
City Council
Agenda Packet Item:
March 31, 2008
~
~HILLS
Request for Council Action
Prepared By:
Dept.:
Council Mtg." Date:
Final Action Needed By:
_ ~~i.s~i~~_ ~i_g~
~_~_~il1~ering
3/31/08
Budgeted Amount:
Actual Amount:
Funding Source:
the Inflow and Infiltration (1&1) report and provide staff with feedback on proposed 2008 action items presented.
the Inflow and Infiltration (1&1) report and provide staff with feedback on proposed 2008 action items presented.
PTRC:
S)Jppoitlng Deicu,n"n!/;: (attach'ld)
x Memo/Letter:
Resolution No.:
Ordinance No.:
Engineering Recommendation:
Attorney Recommendation:
From Civil Engineer Kristine Giga dated March 25, 2008
x Other:
1&1 Report prepared by Chuck Janksi of Bonestroo;
2007 surcharge credit verification to the Metropolitan Council Environmental Services dated March 24,
2008;
Manhole Inspection Map
~
~
EN HILLS
MEMORANDUM
DATE:
March 25, 2008
TO:
Mayor and City Council
Jim Willis, Interim City Administrator
FROM:
Kristine Giga, Civil Engineer
Greg Hoag, Public Works Director
SUBJECT:
Presentation of Inflow and Infiltration (III) Final Draft Report
BACKGROUNDIDISCUSSION
Wastewater collected in the Arden Hills sanitary sewer system flows into main sewer lines
owned and operated by the Metropolitan Council (Met Council), who collects and treats
wastewater for the seven-county metro area. Inflow and infiltration (1&1) is clear water that
makes its way into the sanitary sewer system and mixes with wastewater already in the sanitary
sewer pipe, increasing the amount of wastewater requiring treatment. Infiltration is a result of
groundwater entering the sanitary sewer system via cracks in the sewer pipes, leaky joints, or
deteriorated manholes. The main source of inflow is stormwater that enters the sanitary system
from rain leaders, sump pump discharges or foundation drains, none of which are supposed to be
connected to sanitary sewer lines. The more rain that falls, the more inflow into the system.
The capacity of Met Council's wastewater system is being consumed by 1&1, which, ifnot
corrected, would restrict future growth and potentially cause the bypass of sewer flows into the
Mississippi River. Met Council approved a surcharge program in February 2006 that requires
communities with excessive 1&1 to pay surcharges on their regional wastewater bills. Met
Council has notified communities with significant 1&1 problems. As communities are able to
reduce the excess 1&1 with improvements to their sanitary sewer systems, the surcharge could be
reimbursed. Met Council estimates that it would cost approximately $900 million to expand its
system to treat the excessive flows. Met Council also estimates that if communities were to
address the problem locally, costs would be much less, around $ 150 million.
Met Council notified Arden Hills that the City exceeded our allowed 1&1 limit during a storm
event on October 5, 2005 and that an annual surcharge would be imposed on the City in the
\\Metro-inet.us\ardenhiIls\PR&PW\Engineering\2008\Council_ Actions\3- 3 J -08Memol&l.doc
1&1
3/25/2008
Page 2
amount of$100,100, beginning in 2007. As a result, the City hired Bonestroo to assist with a
study that would begin to identify sources of 1&1 and determine appropriate steps to reduce the
City's 1&1.
Attached is a report discussing the existing sanitary sewer system, methods used in the study to
date, potential 1&1 sources to consider, preliminary conclusions and recommended next steps.
FINANCIAL IMPLICATIONS
The MCES program, as implemented, includes an annual surcharge for a period of five years,
which began in 2007. The City of Arden Hills has been surcharged $500,500, or $100,100 per
year over the five year period. This annual amount has been included in the City's 2008 budget
and in the Five-year Capital bnprovement Plan (CIP.)
RECOMMENDED COUNCIL ACTION
Receive 1&1 report and provide staff with feedback on proposed 2008 work plan.
~
~~HILLS
March 24, 2008
Mr. Kyle Colvin, P.E.
Assistant Manager, Engineering Planning
Metropolitan Council of Environmental Services
390 Robert Street North
St. Paul, MN 55101
Re: Inflow and Infiltration (1&1) Surcharge Credit Verification for 2006-2007
Dear Mr. Colvin:
The City of Arden Hills is submitting its surcharge credit verification information for
work completed in 2006 and 2007. Attached please find the completed credit verification
form, invoices and records of expenses incurred by the City of Arden Hills for 1&1 related
work.
Proposed total expenditures for 2007 exceed the surcharge amount of$IOO,IOO. The
City of Arden Hills requests that the additional expenditures are made available for credit
in 2008. If you have any questions or need additional information, please contact me at
kristine.giga@ci.arden-hills.mn.us or (651) 792-7849.
Sincerely,
~~~!(A./
Kristine Giga, P .E.
Civil Engineer
Cc: Greg Hoag, Public Works Director
Jim Perron, Public Works Superintendent
Jim Willis, Interim City Administrator
Finance Department
Mayor and City Council
City of Arden Hills . 1245 West Highway 96 . Arden Hills, MN . 55112-5743
Phone 651.792.7800 + Fax 651.634.5137 . www.ci.arden-hiUs.mn.us
Appendix 0: Surcharge Credit Verification Form
Complete this form and its attachments to assure MCES that the community has spent the surcharge
equivalent on applicable projects, approved by MCES, during the calendar year 2007 or 2008. To
receive payment, send the completed form to:
Mail: Assistant Manager, Engineering Planning
390 N. Robert Street
SI. Paul, MN 55101
Fax:
Attn: Assistant Manager, Engineering
Planning
(651) 602-1030
Community:
ARDEN ttl L.-l-?
Calendar Year in which Work was Performed: '2-00~ - 2.001-
Was the work pre-approved by MCES? 0 Yes (Attach MCES letter) ~ No
a) Public Facility Work: Attach a detailed breakdown of actual expenditures for the municipal
system III program. Include only amounts actually paid during the calendar year. MCES may
request additional documentation to verify expenditures. Include the percent of each projects costs
that are related to 1/1 mitigation:
Summary of Costs: -::r. ~ 1 S-rU.OY) AAlw MST6"f<
8A:tJ 111<\1'<..'-( sew e~ -relA~"\SINb I
I2X:f'Ale .
~kL.)
"-lA,~l-toL6 lJ,jspecn~>
ANt>
b) Private Property Work: Attach a detailed list itemizing the locations and repairs made on private
properties within municipal borders. Summarize the type of repairs and applicable costs using the
list below:
Sump pump disconnections: $150 per dwelling = $
Foundation drain disconnections: $3,000 per building = $
Rain leader disconnections: $100 per single family dwelling = $
Rain leader disconnections: $3,000 per commercial dwelling = $
Service lateral repairs: $5,000 per repair = $
Describe Other Work:
. '2. qo
Total claimed for U10b -l.Q?1- (calendar year):: $ II'Ll ?9J . --
City or Township OfflclalfTItle: l-I ~ I ,
~h \'J'\ ,HoC<.e"r
Date Signed: :, \ l.S-j 01) Phone #:
l1AIL'L uJo<1KS f)it2VTOR-
051- 7'1:), - TffL/7
Amount Eligible: $
MCES USE ONLY
Form: ILVerification_200S
Last update: 6/12/07
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2335 Highway 36 W
StPaulMN55113
T,,6S1-636~
Fax 651-636-1311
October 29, 2007
Invoice No:
Invoice Am!:
149764
$3,232.00
li'VWVtI.booestroo_com
City of Arden Hills
1245 W Highway 96
Arden Hills, MN 55112-5743
Received
OCT 31 Z007
.. Bonestroo
City of Arden Hills
Professional Services from June 17, 2007 to October 20,2007
Project
000353-07103-0
Infiltration Inflow Analysis
Data Gathering and Evaluation
Total Labor
Hours Rate Amount
5.50 16000 880.00
300 94.00 282.00
625 88.00 550.00
1475 1.712.00
T atal this Phase $1.71200
Project Manager
Engineer
Engineer
Develop Metering Program
Total Labor
Hours
9.50
9.50
Rate
16000
Amount
1,520.00
1,520.00
Project Manager
Total this Phase
$1,520.00
Total this Invoice
$3,232.00
Hourly
Totals
Current
3,232.00
3,232.00
Prior
0.00
000
Total
3,23200
3.23200
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November 27, 2007
Invoice No:
Invoice Amt:
City of Arden Hills
1245 W Highway 96
Arden Hills, MN 55112-5743
Received
NOV 3 {I Z007
City of Arden Hills
Professional Services from October 21, 2007 to November 17, 2007
Project
000353-07103-0
Infiltration Inflow Analysis
150828
$1,56350
2335 Highway 36 W
SL Paul MN 55113
Tel 651-636-4600
Fax 651-636-1311
\NIIVW.oonestroo.mm
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Data Gathering and Evaluation
Project Manager
Engineer
Hours
1.00
U5
3.25
Total labor
Rate
160.00
94.00
Amount
160.00
211. 50
371.50
$371. 50
Report Preparation
Project Manager
Engineer
Hours
2.50
900
11.50
Total labor
Total this Phase
Rate
160.00
88.00
Amount
400.00
792.00
1,192.00
lotal this Phase
Total this Invoice
Billings to Date
Current Prior Total
Hourly 1,56350 3,232.00 4,795.50
Totals 1,563.50 3,232.00 4,795.50
$1,19200
$1,563.50
January 25, 2008
Invoice No:
Invoice Am!:
152875
$1.760.00
City of Arden Hills
1245 W Highway 96
Arden Hills, MN 55112-5743
Received
FE8 - 1 2uD8
City of Arden Hills
Professional Services from December I, 2007 to December 31,2007
Project
000353-07103-0
Infiltration Inflow Analysis
Report Preparation
Project Manager
Hours
11.00
11.00
Amount
1.760.00
l.760.00
Rate
160.00
Total labor
T otalthis Phase
Total this Invoice
Billings to Date
Current Prior Total
Hourly 1.760,00 4.79550 6,555.50
Totals 1.76000 4,795.50 6,55550
AU imaic~ af-2 due ar.d paY3~je ,':ithi" 50 day,;. ~:1t2;c':: ~;:il1 hi: .charge::! .3i .or; a~::t;d! ra,;; of 18% Oil all amOU:ll5 nat paid withi;'] 30 dar,.
Please remit all invoice payments to our lockbox:
Bonestroo
P.O. Box 1521, Dept. #1156
Minneapor~, MN 55480-1521
All other correspondence should continue to be sent to your !Q{a! Boneslroo office
1135 Highway 36 W
StPaulMNSS113
Tel 651-636-4600
Fax6S1-636-1311
vvww.bonestmo.com
.. Bonestroo
$1,760.00
$l.760.00
INVOICE
ilww.mvtl.com
lABORATORIES, Inc.
1126 NO. FRONT STREET
P.O. BOX 249
NEW Ut.M, MN 56073-0249
PHONE (507) 354-8517 FAX (507) 359-2890
WE ARE AN EQUAL OPPORTUNITY EMPLOYER
A SERVICE CHARGE OF 1 'Jz% PER MONTH (18% APRJ.
will be made on balances due beyond
the terms stated -on the invoice.
Minimum charge $.50.
BILL TO:
We accept VISA & MasterCard
REPORT TO:
ARDEN HILLS, CITY OF
ACCOUNTS PAYABLE
1245 W H(~Y 96
ARDEN HILLS MN 55112
11ROEN HILLS, CITY OF
ACCOUNTS PAYABLE
1245 (~ Hl~Y 96
ARDEN HILt.S MN 55112
TOMER NO. iNVOICE NO. iNVOICE DATE DUE DATE TERMS CUSTOMER P.O. NUMBER
1437 362195 8/29}e'7 9/13/07 NET 15 DAYS ARDEN HILLS
WORK ORDER NO. REPORT DATE ANALYTICAL LABORATORY
31.00451 8}29}07 NEW ULM INDRGANICS LAB
..
TESTS DESCRIPTION LIST PRICE DISCOUNT AMOUNT
1. Tech Time T17023 1.1 2,011.50 2,011.50
1 Mileage M35023 11 321.30 321. 30
1 Supplies & Expenses S97023 11 1.52.55 152.55
1 Equipment Rental E70023 11 6,237.00 6,237,00
SALES TAX DISCOUNT AMOUNT DUE
.00 .00 8,722.35
TO ENSURE PROPER CREDIT, PLEASE DETACH & REMIT THIS PORTION WITH PAYMENT
1437
ARDEN HILLS, CITY OF
362195
DUE DATE
9/13/07
AMOUNT DUE 3,722,35
PLEASE MAKE CHECKS PAYABLE TO MINNESOTA VALLEY TESTING LABS
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NORTHERN WATER WORKS SUPPLY
BLAINE'MN.
763-560-5200 Fax 763-560-1799
An Equal Opportunity Employer
Invoice
iilllm!@1!Ml!!mtriu
07/20/06
REMIT TO:
PO BOX 1070
FARGO NO 58107-1070 1
BILL TO:
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
SHIP TO:
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
J4AR27R200
~7 X 2 HDPE MH ADJ RING 27R200
J4ARSEALTUBE
IDPE MH ADJ RING SEALANT 10 OZ TUBE
40ea
40ea
3.72
148.80
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voice is due y 08719/ 6.
~s: Due Net 30 Days from date of Invoice. A SERVICE CHARGE is computed by a periodic
~ of 1.5% per month. This is an ANNUAl PERCENTAGE RATE of 18%.
:redit wi It be allowed for goods returned without permission. Returned goods must be
~aleabte condition. A re-stocking charge will be made on all g.oods returned far
jit. Ue are not responsible for damage in transit. Claims must be filed with carrier_
e billing inquiries dial 1-888-873-5685
Subtotal
S&H CHGS
Tax
1210.40
0.00
78.68
Amount Due
1289.08
s
NORTHERN WATER WORKS SUPPLY
BLAINE MN
763-560-5200 Fax 763-560-1799
An Equal Opportunity Employer
Invoice
iMmiHiMltilltil6r#HMi .". HiiMlmml!%'i~lM!
0 8 / 0 1 / 0 6 S 0 1 0 3 6 9 9 1 0 0 1
REMIT TO : ;;iit~#tiM'm!F:
PO BOX 1 0 7 0
FARGO ND 5 8 1 0 7 - 1 0 7 0 1
Blt.l TO:
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
SHIP TO:
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
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34AR27R200
27 X 2 HDPE MH ADJ RING 27R200
34ARSEALTUBE
{DPE MH ADJ RING SEALANT 10 OZ TUBE
20ea
20ea
3.72
74.40
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voice is due y 08731/ 6.
~s: Due Net 30 Days from date of Invoice~ A SERVICE CHARGE is computed by a periodic
~ of 1.5% per month. This is an ANNUAl PERCENTAGE RATE of 18%.
:redit will be allowed for goods returned without permission. Returned goods must be
;aleable condition. A re-stocking charge wilt be made on all goods returned for
iit. ~e are not responsible foc damage in transit4 Claims must be filed with carriec4
, billing inquiries dial 1-888..873-5685
Subtotal
S&H CHGS
Tax
645.01
0.00
41. 93
Amount Due
686.94
s
NORTHERN WATER WORKS SUPPLY
BLArNEMN
763-560-5200 Fax 763-560-1799
An Equal Opportunity Employer
Invoice
itiNNl]ilVilji*Jllmlt'tt'""""",
......................_._--..-......-...
08/15/06
REMIT TO:
PO BOX 1070
FARGO NO 58107-1070 1
BILL TO:
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
SHIP TO:
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
""""""""',,"""-'"''''''''''
~;:;}~;;~i:~;~~~:~,~~::::;:;::;:::;;:;:
J4AR27R200
~7 X 2 HDPE MH ADJ RING 27R200
l4ARSEALTUBE
[DPE MH ADJ RING SEALANT 10 02 TUBE
48ea
48ea
3.72
178.56
REC-U ,~~
t:1V~'~ .
AUG 2 1 2006
CITY OF ARDEN HILLS
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t\<!C,'*L:;l.-:J.-7v ~
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voice is due y 09714/ 6.
IS: Due Net 30 Days from date of Invoice. A SERVICE CHARGE is computed by a periodic
~ of 1.5.% per month~ This is an ANNUAL PERCENTAGE RATE of 18%.
TecHt will be allowed for goods returned without permission~ Returned goods must be
,ateable condition~ A re-stoclcing charge witl be made on all goods returned for
I1t_ We are not responsible for damage in transit~ Claims must be filed with carrier.
. billing inquiries dial 1-888-873-5685
Subtotal
S&H CHGS
Tax
443.96
0.00
28.86
Amount Due
472.82
NORTHERN WATER WORKS SUPPLY
1694 9lST AVE NE
BLAINE MN 55449
763-560-5200 Fax 763-560-1799
Order #:
Ord Date
printed:
Page #
** PICK TICKET **
S01046050.001
09/08/06
10:07:28 25 SEP 2006 COT
1 of 1
30ld To: 2646
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
Ship To: 2646
CITY OF ARDEN HILLS
WATER DEPARTMENT
1245 WEST HIGHWAY 96
ARDEN HILLS, MN 55112
Job Name
Ship Date
09/08/06
Ship via
WC WILL-CALL
Warehouse
Shp 3 Ent 3
:::Ustomer PO
>HKE
-lri ter
C.SCHOEPK
Freight
PPA
salesperson
Todd Phillips
Ordered By
MIKE
Contact#
651-634-5120
Ordered
Shipped
Product Description
Net Prc
Ext Pre
75ea
75ea
94AR27R200
27 X 2 HOPE MH
Lec: --
Secondary Loc:
13 .27
995.25
ADJ RING 27R200
Pn: 15746 Wgt: 432.75
Y34
25ea
25ea
94AR27R400
27 X 4 HDPE MH
Loc: --
Secondary Loc:
23.87
596.75
ADJ RING 27R400
Pn: 15747 Wgt:
Y34
267.75
SUBTOTAL
SALES TAX%-
1592.00
103.48
*** Thank you for your Business ***
Total J..J!1.0unt
1695.48
OO{P'W
'i1led by . ~heeked
~stomer S1gnature: \
by
Pieces
Total Weight: 700.5
Date: ___/___/___
'0 credit will be allowed for goods returned without permission. Return goods
Bust be in saleable condition. A re-stocking charge will be made on all goods
~eturned for credit. We are not responsible for damage in transit. Claims must
)e filed with carrier.
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CONTRACTOR SUPPLY !>IV/SION
2023 CIlNTRE POINTE BLVD., l:lOll
MENDOTA HEIGffTS. loIN 55120
PboIlO: 6$1-611.9292
~;6$1-1II8-0124
IlEMITPAYMENTTO:
CEMSTONE PROOIJCI'S COMPANY
M.t:162
P.O. 80. 1414
St. Paul. MN 354>>-1414
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Report
2!QQ~lnfiltration I Inflow Program
City of Arden Hills
March 2008
Project Number: 353-07103
.tt Bonestroo
City of Arden Hills
March 2008
2335 Highway 36 W
St. Paul, MN 55113
T,1651-636-4600
fax 651-636-1311
\iVIf{'N.bonestroo.com
March 17, 2008
.tt Bonestroo
Ms. Kris Giga, PE
City of Arden Hills
1245 W Hwy 96
Arden Hills, Mn 55112-5743
Re: 2007 III Program
City of Arden Hills
Bonestroo File No.: 353-07103-0
Dear Ms. Giga,
We are pleased to present the City of Arden Hills with this report on the 2007 Infiltration/Inflow Program. This
project consisted of an initial sanitary sewer collection system analysis effort with the ultimate goal of reducing the
amount of clear water in the City system. This clear water results in MCE5 charges for treatment in addition to a
surcharge for the peak flow rate.
Based on the analyses completed we have provided some guidance subsequent analytical steps and identification
procedures, which can then be followed by rehabilitation of clear water sources. These are basic steps and will be
subject to future modification and adaptation as more data are developed. The City's goal of III reduction will
require a long term commitment to continuously observe conditions and rehabilitate sources as they are identified
or they occur.
Thank you for the opportunity to work on this project and get to know some of the City staff. We are available to
discuss the contents of this report with you and other interested parties at any mutually convenient time.
Sincerely,
BONESTROO
CV\~~.
Charles Jans{}
Project Manager
I hereby certify that this Report was prepared by me
or under my direct supervision and that I am a duly
Licensed Professional Engineer under the laws of the
State of Minnesota.
Cha~~~'
Date: ~~.Ilo8' Reg. No.: 14596
Page 2 of 12
City of Arden Hills
March 2008
I. Introduction and Purpose
Infiltration I Inflow (III) is defined as clear water that enters a sanitary sewer system. Infiltration is clear
water that seeps into the pipe network from groundwater, and Inflow is clear water that is diredly related to
rainfall or runoff events. III is a term used to describe all clear water without attempting to differentiate its
source. This clear water does not require treatment until it is mixed with the wastewater already in the sanitary
sewer pipe. Once it is mixed, the combined flow must be conveyed to a treatment facility for treatment before
it can be discharged back into the surface water network.
The III in the system can increase the normal flow in the system enough to stress the conveyance capacity
of the pipe network, pumping stations, and the wastewater treatment facilities. In the seven county
metropolitan area, the Metropolitan Council Environmental Services (MCES) provides an interceptor sewer
system to coiled the wastewater from over 100 communities and convey it to one of eight MCES wastewater
treatment facilities located around the metropolitan area. Communities own and operate their own local
sanitary sewer systems to coiled the wastewater from individual buildings within their service area. Any clear
water (III) entering a local colledion system is conveyed to and through the MCES system and diredly impacts
the available capacity of the MCES interceptor and treatment facilities.
The Metropolitan Council appointed a Task Force to identify solutions to the regional III problem. The
Task Force worked from April 2003 to May 2004 and developed recommendations which were adopted by the
Metropolitan Council as Policy in 2004. The Policy established the III Surcharge Program that is now in effed
with the intent to avoid "hundreds of millions" of dollars in regional infrastrudure costs.
The MCES currently monitors wastewater flows from all the tributary communities in the service area.
With the III Surcharge Program an additional step was initiated to monitor peak flow conditions. Briefly, the
program establishes a three year average flow for each community or "metershed" within the system. A
peaking factor (multiplier) is applied to the average flow to determine an allowable peak flow. The peaking
fador was previously adopted by the MCES for design purposes and it ranges from 4.0 for average flows less
than 110,000 gallons per day (gpd) to 1.7 for flows over 30.0 million gallons per day (mgd). The MCES
reviews hourly flow data from each meter during runoff events and compares the actual "peak hourly" flow to
the allowable peak flow. If the actual peak is higher than the allowable peak, the extra flow is considered
"excessive" and subjed to the III surcharge rate of $350,000 per mgd (this rate is annually increased by an
inflation fador). The 1/1 surcharge is calculated for the highest peak recorded by the MCES and the surcharge
amount is subdivided into five (5) years of annual payments. If a greater peak is recorded in the five year
period, the surcharge amount can be recalculated and increased for the remaining years in the 5 year program
term. Surcharges began in 2007 and will run through 2011.
The City of Arden Hills is subdivided into three "metersheds" for measuring and recording wastewater
flow. The combined total" excess" peak flow of these three metersheds was 1.43 mgd on October 4, 2005.
Using this peak flow rate, the City's III surcharge was calculated to be $500,500 which is to be colleded at an
annual rate of $100,100. The City has the option to pay the surcharge amount to the MCES, or make III
redudion improvements to their system that will diredly off set the surcharge amount. If the City expends less
than the annual surcharge amount, the balance will be colleded by the MCES and held in an account for future
III improvement work. At the end of the five year program if there are any funds remaining in the community's
MCES account, they will be turned over to the MCES as a "demand" charge and the MCES will use the funds
for regional system improvements. At the end of the live year III Surcharge Program, the MCES will continue
annual charge communities for peak flows in excess of the allowable flow, but the funds will go diredly to the
MCES budget and will not be available to the Community for III redudion efforts. The goal is to make enough
III improvements between 2007 and 2011 to eliminate the excess peak flow and therefore eliminate the III
surcharge entirely.
Page 3 of 12
City of Arden Hills
March 2008
The purpose of this study and report is to begin the process of quantifying the III in the Arden Hills
sanitary sewer system, isolating areas with the most significant problems, and preparing a plan of action for
additional work to identify and remove sources of the III in order to eliminate the need for the MCES III
Surcharge in the future.
II. Background
According to the Metropolitan Council Water Resource Management Policy Plan, the City of Arden Hills is
expected to grow in population from 9,652 in 2000 to 22,500 in 2030 and grow in households from 2,959 in
2000 to 8,000 in 2030 (Note that the current Arden Hills Comprehensive Plan, which has not been adopted
yet, anticipates a 2030 population of 13,500 people and 4,600 households. The reduction is due to a less
aggressive development schedule for the TCAAP Area). This growth will increase the demands on the local and
regional infrastructure including the wastewater collection and treatment systems that are the subject of this
report.
Wastewater flow from the City of Arden Hills is measured and recorded by the MCES at four separate
meter sites (MOS1, MOS2, M054, and MOS9) located as shown on Figure 1. The existing Arden Hills sanitary
sewer system includes approximately 232,300 feet of 8 inch to 21 inch diameter sewer pipe divided into four
districts or "meter sheds" as shown in Table 1.
Table 1 - Sanitary Sewer Inventory
Meter Number Range of pipe diameters Length Comments
On) (It)
M051 8"-18" 66,100
M052 8" 8,900
M054 8"-21" 71,300
M059 8"-21" 82,600
Unmetered (lS 7) 8" 3,400
Total 232,300
The total wastewater from the City of Arden Hills is estimated by summing the total flow {rom each of the
four meter5 and adding an estimate for the un-metered area served by lift station 7. The annual average daily
flow5 for the metered areas for each of the past three years are listed in Table 2.
Table 2 - Annual Averaoe Dail Flow bv Meter Shed in mod
Meter Number 2004 2005 2006 MCES 3Yr Avg Allowable
Peak
M051 0.448 0.432 0.435 0.44 1.54
M052 0.038 0.039 0.038 0.04 0.16
M054 0.198 0.197 0.183 0.19 0.27
M059 0.317 0.312 0.286 0.32 1.15
Total 1.001 0.980 0.942 0.99
The annual average daily flow has declined slightly each year during this monitoring period.
During runoff conditions following a rain event or snowmelt period, the flows increase markedly due to
infiltration and inflow (III) entering the sanitary sewer system. In September 2007, the City wastewater flow
peaked in response to a 1.83 inch rainfall event. The peak hourly flows recorded at each MCES meter site are
listed in Table 3.
Page 4 of 12
City of Arden Hills
March 2008
Table 3 - Peak Hourlv Flow in mod followina 1.83 inch rainfall event on Seotember 19,2007
Meter Number Peak Haurlv Flow Rate in mad
M051 1.20
M052 0.10
M054 0.57'
Ma59 US'
"Note: Calculated peak flow Tate exceeds allowable flow listed in Table 2
III. Temporary Flow Metering
Temporary flow meters were installed in three manholes to subdivide the meter sheds of Meters M054
and M059 in an attempt to isolate III flows to smaller areas and focus rehabilitation efforts. The locations of
the temporary meters are shown on Figure 1. The temporary meters consisted of a transducer placed in the
flow channel, connected to a flow meterl data logger. The flow meter collects readings of flow depth and
velocity from the submerged transducer. These values are then input into a formula and a flow rate is
estimated. The three temporary flow meters were installed in the system from July 19, 2007 to August 29,
2007. This period was generally dry; however 2.05 inches of rainfall were received over a two day period on
August 27 and 28, 2007. The flow data from the temporary meters are summarized in Table 4.
Table 4. - Summrnf Temoorarv Flow Meterlno Data in mad
Meter 1 Meter 2 Meter 3
Drv Weather Flow (Sf23/071 0.42 . 0.07 0.13
Peak Hourly flow (S/28/07) 1.15'" 0.15 0.27
"Note: Temporary meter number 1 was Installed to diVIde the Meter 059 Meter Shed and attempt to isolate pos$jble :/1 sources.
This meter was operating for about 8 weeks so no long term average flow data are available; however, some dry weather and peak data
are available for evaluation. The flow data recorded at meter 1 suggest flow rates in excess of those recorded at the downstream meter
M059 and therefore the data are considered unreliable for comparison at this time.
IV. Data Analysis
The flow meters provide basic flow quantification and can be used in a number of ways to estimate an III
quantity and make some predictions about possible sources of the III based on the flow patterns. The data can
also be combined with other available City data to prioritize areas and maximize rehabilitation efforts.
The data analysis included a number of steps as described below. The actual analysis for each" meter
shed" is presented in a series of Figures in the Appendix, and the results are summarized in Table 5.
Background Data.
a The estimated number of "Residential Equivalent Connections (REC)" and the length of the sanitary sewer
tributary to the meter location were obtained from the City graphical information system (GIS).
a The Monthly Flow data from the past three years were obtained from the MCES for their meters.
a Data from the temporary meters were compiled.
Parameters for (omparison
a Estimate annual III volume and treatment cost using "base" flow analysis
. The average daily wastewater flow from January is assumed to be a "base" flow that includes a
minimal amount of infiltration.
. The average daily flow from January is subtracted from the annual average daily flow and the
annual III volume and treatment cost are calculated.
a Per Connection flow rate
o The annual average daily flow, January daily flow, and the peak month daily flow are divided by
the number of Equivalent Residential Connections (ERC).
Page 5 of 12
City of Arden Hills
March 2008
o Estimate III rates and per connection contributions using hourly flow data and early morning minimum
flow rates.
. In general, the flow in a sanitary sewer during the early morning hours (3:00- 5:00 AM) is a
reasonable estimate of infiltration because there is minimal sanitary use of the system at that
time. This estimate can be affected by water softener recharge cycles or commercial! industrial
uses that continue throughout the night
. The early morning flow rate for a dry weather (non-rainfall) day is subtracted frorn the total flow
for the day to calculate an average daily "wastewater" flow for a dry weather (non-rainfall) day.
. The estimated infiltration rate is divided by the "inch-miles" of sewer pipe that are tributary to
the location
. The calculated wastewater flow rate is divided by the number of connections to determine a
"per connection" rate.
o Estimate Inflow rates.
. By definition, inflow generates a peak flow condition as a result of a rainfall or runoff event.
. During the temporary metering period, 2.05 inches of rain were received on August 27 and 28,
2007. A more significant 1.83 inch rainfall occurred on September 19, 2007 after the
temporary meters were removed. The August event will be used for the temporary meter
locations and the September event will be used for the MCES meter locations.
. The inflow rate is estimated by noting the peak hourly flow rate during the rainfall period and
the time of occurrence.
. The flow rate for the same time period on a dry day is then subtracted from the peak hourly flow
on the rainfall day to separate out the portion of the flow attributable to the rainfall event. This
value is the peak hourlv inflow rate.
o Calculate an adjusted peak flow rate.
. Determine the normal peak hourly wastewater flow on a dry weather day.
. Add the peak hourly inflow rate to the peak hour wastewater flow rate to determine a "worst
case" peak rate that could occur if the two events were simultaneous. This value is the
adiusted peak flow rate.
. Calculate a peak flow to average flow ratio for comparison with MCES guidelines.
o Calculate inflow rate in gpd per connection and per inch mile of sewer for comparison purposes.
The remaining item in the data analysis is the review of the flow graph itself. The flow graph figures
provide a graphic comparison of the dry weather flow versus the wet weather peak flow in each meter area.
The shape of the graph orthe "flow response" can be an indicator ofthe type of III sources that may be
responsible for the clear water flow. The rapid rise and decline as demonstrated in Figure 3 Meter 051 would
suggest a direct type connection that contributes flow for a short time during the runoff event and then stops
operating after the runoff ceases. A rapid increase and a slow decline demonstrated in Figure 11 Meter 054
suggests a more extended flow contribution from a very long service area (long transport time in the pipes), or
a foundation drainl sump pump type connection that requires an extended time after the end of the runoff
event for the flow to percolate through the soil to the collector pipe.
Page 6 of 12
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City of Arden Hills
March 2008
V. Summary of Analysis
Table 5 provides a summaI}' of all the data developed in the previous paragraphs. The MCES II Surcharge
program is focused on the" Inflow" portion of the clear water and the highest costs for the City of Arden Hills
are associated with flow in this categol}'; however, it is important to consider the infiltration portion as well
since both infiltration and inflow result in treatment costs to the community.
Using the data included in Table 5, the matrix in Table 6 is developed to prioritize areas for additional
work. The various factors were ranked numerically from low to high with the low number reflecting the worst
case, so the lowest sum will be the highest priority for additional work.
Table 6. - Prtoritization Rankino Matrix
Area Infiltration! in-mi PIA Ratio Inflowl in-mi Sum Prioritv
Meter MaSl 1 3 2 6 2
Meter 2 3 4 6 13 S
Meter 3 4 2 3 9 3
Meter M052 2 3 4 3 .-
9
Meter M054 S 2 5 12 4
Meter MOS9 5 1 1 7 1
~ ;; ;! -+ g ;!
* Note: (urrent data from Meter 1 are not sUItable for companson with other meter sheds.
Meter Area M051 is the highest priority for additional work with emphasis on the area between MOS1,
Meter 2 and Meter 3. However, the area served by Meter M059 had the highest Inflow Related ran kings and
therefore should be considered the highest priority for the III Surcharge reduction efforts.
VI. Potential III Sources to consider
The flow response demonstrated in Figures 3, 5,7,9,11,13, and 15 provide one indicator ofthe type of III
sources that can be anticipated in the service area. The type of sources in turn define the type of further
investigative methods that should be considered in the various areas. It is impossible to completely define the
sources at this stage of the process but we would anticipate that the sources \lvill be more dearly identified as
the investigation effort proceeds.
Figure 3 - Meter 051 Flow chart indicates a short duration quick spike in flow with the flow remaining
elevated slightly for an extended period of time. This flow pattern suggests a possible mixture of some direct
inflow sources, such as catch basins, area drains, low manholes, or roof drains, with some longer acting
sources such as sump pump connections, direct footing drainage tile, or leaking service pipes.
Figure 5 - Meter M2 flow chart shows an immediate sharp spike with the flow remaining elevated for
more than a day following the peak event. This flow pattern suggests primarily longer acting type sources such
as sump pumps, direct footing drain tiles, or leaking sewer service pipes.
Figure 7 - Meter M3 flow chart shows an immediate sharp spike with vel}' little long term flow impacts.
This pattern suggests some direct inflow sources, such as catch basins, area drains, low manholes, or roof
drains, with possibly a small number of longer acting sources such as some sump pump connections, direct
footing drainage tile, or leaking service pipes.
Figure 9 - Meter 052 flow chart indicates a short duration quick spike in flow with the flow remaining
elevated slightly for an extended period of time. This flow pattern suggests a possible mixture of some direct
inflow sources, such as catch basins, area drains, low manholes, or roof drains, with some longer acting
sources such as sump pump connections, direct footing drainage tile, or leaking service pipes.
Page 8 of 12
City of Arden Hills
March 2008
Figure 11 - Meter 054 flow chart shows an immediate sharp spike with the flow remaining elevated for
more than a day following the peak event. This flow pattern suggests primarily longer acting sources such as
sump pumps, direct footing drain tiles, or leaking sewer service pipes.
Figure 13 - Meter 059 flow chart indicates a short duration quick spike in flow with the flow remaining
elevated slightly for an extended period of time. This flow pattern suggests a possible mixture of some direct
inflow sources, such as catch basins, area drains, low manholes, or roof drains, with some longer acting
sources such as sump pump connections, direct footing drainage tile, or leaking service pipes.
The flow spike is significantly higher than the normal flow during the same period which supports the
relative severity of the inflow in this selVice area.
Figure 15 - Meter Ml flow chart indicates a short duration quick spike in flow with the flow remaining
elevated for an extended period of time. While the data are considered questionable, the flow pattern should
reflect the flow response in the manhole location. This pattern suggests a possible mixture of some direct
inflow sources, such as catch basins, area drains, low manholes, or roof drains, with some longer acting
sources such as some sump pump connections, direct footing drainage tile, or leaking selVice pipes.
VII. Preliminary Conclusions
The peak flow analysis indicates that there is inflow in each of the four primary metersheds while the
September 18, 2007 event resulted in a possible "flow exceedence" event at meters M054 and M059 only.
The projected peak flow rate at M051 was very near the allowable peak rate, but did not exceed the rate.
The work completed to date is the first step identifiying and removing the III in the collection system.
Additional investigation will be necessary to further identify sources and complete rehabilitation to reduce the
III flow rates.
Based on the flow response, it is anticipated that private property type sources including sump pumps,
direct foundation drains, and possibly deteriorated sewer selVice connections provide a portion of the inflow in
each selVice area; however, in areas M 1 and MOS4 these connections may be the major contributors. In Area
M2, the flow response is similar but the selVice area is primarily commercial I industrial so the number of
foundation drain type connections is probably limited and this response may be due to a low manhole or area
drain that drains slowly after a rainfall event.
In areas MOS1, M3, M052, and MOS9, the flow response suggests that there are some direct type
connections in addition to some private property sources.
The current data are not sufficient to specifically identify sources for the inflow, however, they can be used
to plan subsequent data collection and inflow investigation efforts.
VIII. Recommendations for next steps
The flow data collected during 2007 generally provided some background information and response data
for a limited storm event following a very dry summer period. We would recommend conducting additional
flow metering at each of the temporary meter sites to try and record the response to a larger (2") rainfall event
during more normal groundwater conditions. In addition, all of the lift stations should be calibrated so the
running time data can be used to subdivide the flows within the larger MCES meter areas. There are five lift
stations in the MOS4 selVice area that may be able to further isolate the suspected private property type
sources.
Table 7 includes a summary of typical III sources, investigative procedures that are designed to identify
these sources, and rehabilitation options typically associated with the particular source. This is not an
exhaustive list but can be considered a guide for the next steps in the III identification and rehabilitation
process.
Page g of 12
City of Arden Hills
March 2008
Table 7 - Summary of T voicallll Source, Investiaation Procedures, and Rehabilitation Options
Infiltration Potential Source Investigative Procedures Rehabilitation Options
or Inflow
Inflow Manhole Covers Smoke Test Replace Cover
Physical Survey Raise Cover
Seal Cover Rim Area
Inflow Area Drains Smoke Test Re-route flow to storm sewer or surface
discharoe
Inflow Roof Drains Building Inspeaion Re-route flow to storm sewer or surface
Smoke Test discharge
Dve Test
Infiltrationl Deteriorated Adjustment Manhole Inspeaion Replace rings and seal
Inflow Rings Install sealing product (Chimney seal, Infi-
shield)
Infiltrationl Sump Pump Connection Basement Inspection He-route discharge out of basement ~o
Inflow surface
Infiltrationl Direct Foundation Drains TV inspection of service pipe Re-route to sump pump and discharge
Inflow outside basement to surface .-
Infiltrationl l1'aking Service pipe TV inspection of service pipe Replace service pipe
Inflow Install CIPP liner
Infiltration Manhole wall seepage Manhole Inspection Grout Injection
Replace Manhole
Install Manhole liner
Infiltration Pipe Joint leakage Televise sewer main Joint Grouting
C1PP lining
Pipe Replacement
In the service areas for meters M 1, M2, and M054, initial investigation efforts should be focused on
possible private property type sources. Investigation should include sump pump surveys of individual properties
and televising individual service lines during wet conditions. Some communities have had reasonable success
televising the service lines from the main sewer using a remote camera. This process is less expensive and
significantly less intrusive than attempting to televise services from the basement of a property. In
consideration of the potential problems with basement access, we would recommend attempting to televise
several service lines in several areas of these service areas to test the procedure and view the results prior to
widespread implementation of a program. Since sump pump inspections can be a difficult project and the cost
implications can be significant, the progr<lm should be implemented throughout the entire community with
priority areas defined by the identified inflow areas.
In the service areas for meters M3, M051,M052, and M059, initial investigative efforts should be focused
on direct inflow sources, with smoke testing, physical survey of manholes, roof leader inspections, and dye
testing as necessary. Manholes located in roadside ditch areas such as those repaired along Hwy 10 can be a
significant source of inflow and all manholes located on easements or off paved road areas should be
inspected for flooding potential and damaged rings. Sump Pumps are also considered a direct inflow source
and they will generate a significant flow spike so a survey in these areas will provide some useful information
as well as providing a "complete" inspection.
Inflow defects that are identified should be repaired as soon as feasible after identification to reduce the
inflow as much and as quickly as possible. This will reduce the MCES treatment charges as well as assist in
further evaluation of the system since other defects may become evident when some of the flow is removed.
These investigation recommendations are a starting point and problems identified or defects noted may
require additional investigation or other unique investigative techniques. The results of each procedure should
be reviewed <lnd evaluated to determine the next step in the investigative effort.
Pagel00fl2
City of Arden Hills
March 2008
IX. Schedule
A. 2008 Plan
o Install flow meters for peak wet weather period to attempt to capture several rainfall events
o Calibrate pumps at each of the collection system lift stations
o Evaluate flows from each lift station area and compare to flows at temporary meters and MCES
flow meters.
o Conduct physical survey of manholes located in "off-road" locations
o Complete rehabilitation of any identified manhole inflow sources
o Experiment with televising sewer service lines in 10 - 20 locations
B. 2009 Plan
o Conduct sump pump surveys of 50 % of the sewer service area.
o follow up on sewer service line inspection based on experience from 2008
o Evaluate flows throughout system using lift station metering points and MCES Meters
o
C. 2010 Plan
o Conduct sump pump surveys of remaining 50% of the sewer service area
o Evaluate flows throughout system using lift station metering points and MCES Meters.
o Consider sewer replace programs if defective services are identified.
D. 2011 Plan
o Complete any remaining rehabilitation projects
Page 11 of 12
City of Arden Hills
March 2008
Appendix
Figures 1 through 15
Page 12 of 12
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FIGURE 2 ESTIMATION OF INFILTRATION I INFLOW
Meter Shed
IM051
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
I
11~~lin-mi
Method 1 - Assume no 1/1 in January
Annual January pejk Mo.
Average
2004 0.448 0.362 0.540 June
2005 0.432 0.367 0.534 Oct
2006 0.435 0.408 0.579 May
1/1
(mgd)
0.086
0.065
0.027
(MG annual)
31.39
23.73
9.86
64.97
1,543
100,249
33,416
(%)
19.20%
15.05%
6.21%
13.48%
Monthly Flow Data (mgd)
Calculated GPO per connection
2006 rate $
Total Cost $
Annual $
(3 yr avg)
Annual January pejk Mo.
Average
2004 496 400 597
2005 478 406 591
2006 481 451 640
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/30/2007 Daily Flow
Dry Day - Early Morning Flow
Net Wastewater
10,000 Igph
I
453,000 Igpd
240,000 gpd
213,000 gpd
Infiltration rate:
(EMFfln mil
2,050 gpdJin mi
Wastewater per connection:
236 gpdlconnection
Peak Flow 9/20/07
Peak Hour Rate: 20:00 hrs
Dry day flow at time
INFLOW
Inflow per connection
49,861 gph 1.197 mgd
16,568 gph 0.398 mgd
33,293 gph 0.799 mgd
0.690
1.491mgd
3.29
884 gpdlconnection
6,824 gpdlin mi
Normal Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per in mile
M051
- .__..________.______._ _. __.___.___.__ _____,~_____.____.____..__.__._..__.____ _n_
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00
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FIGURE 4 ESTIMATION OF INFILTRATION I INFLOW
Meter Shed 1M2
20,1lin.mi
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
Method 1 - NOT APPLICABLE FOR TEMPORARY METERS
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/23/2007 Daily Flow
Dry Day - Early Morning Flow
Net Wastewater
73,700 jgpd
28,800 gpd
44,900 gpd
1 ,200 19ph
Infiltration rate:
(EMF/in mil
1,433 gpd/in mi
Wastewater per connection:
#DIV/O! gpd/connection
Peak Flow 8/28/07
Inflow per in mile
6,400 gph 0.154 mgd
3,950 gph 0.095 mgd
2,450 gph 0.059 mgd
0.100
0.161mgd
2.17
#DIV/O! gpd/connection
2,925 gpd/in mi
Peak Hour Rate: 08:55 hrs
Dry day flow at time
tNFLOW
Normal Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per connection
M2
N
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r-: co to <<i C') N ~
Hd~ U! MOl::!
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
38.9Iin-mi
FIGURE 6 ESTIMATION OF INFILTRATION I INFLOW
Meter Shed 1M3
Method 1 - NOT APPLICABLE FOR TEMPORARY METERS
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/23/2007 Daily Flow
Dry Day - Early Morning Flow
Net Wastewater
133,050 Igpd
51,600 gpd
81 ,450 gpd
2,150 Igph
Infiltration rate:
(EMF/in mil
1,326 gpd/in mi
Wastewater per connection:
IDlY 10! gpd/connection
Peak Flow 8/28/07
Peak Hour Rate: 03:55 hrs
Dry day flow at time
INFLOW
11,100 gph 0.266 mgd
2,550 gph 0.061 mgd
8,550 gph 0.205 mgd
0.280
0.491mgd
3.68
IDlY IO! gpd/connection
5,275 gpd/in m i
Normal Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per connection
Inflow per in mile
M3
1'-1'-
00
1'-00
oC\lC\l
~ ~
0<1"0>
C\I~C\I
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0~1'-
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rororo
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tn
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OO:~
0 0 0 0 0 0 0
0 0 0 0 0 0
0 q 0_ q o~ 0
C\I 0 ro <0 <I" C\i
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FIGURE 8 ESTIMATION OF INFILTRATION I INFLOW
Meter Shed
I M052
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
1121
13.6 in-mi
Method 1 - Assume no VI in January
Monthly Flow Data (mgd)
Annual January peat Mo.
Average
2004 0.039 0.030 0.047 June
2005 0.039 0.035 0.043 June
2006 0.038 0.036 0.043 Sep
III
(mgd)
0.009
0.004
0.002
(MG annual) (%)
3.29 23.08%
1.46 10.26%
0.73 5.26%
5.48 12.87%
1,543
8,448
2,816
Calculated GPD per connection
2006 rate $
T olal Cost $
Annual $
Annual January Peak Mo.
Average I
2004 348 268 420
2005 348 313 384
2006 339 321 384
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/30/2007 Daily Flow
Dry Day - Early Morning Flow
Net Wastewater
43,000 Igpd
24,000 gpd
t 9,000 gpd
1,000 jgph
Infiltration rate:
(EMFlin mil
1,765 gpd/in mi
Wastewater per connection:
170 gpd/connection
Peak Flow 9/20/07
Inflow per connection
4,302 gph 0.103 mgd
1,97t gph 0.047 mgd
2,331 gph 0.056 mgd
0.080
0.141mgd
3.26
500 gpdlconnection
4,114 gpdlin mi
Peak Hour Rate: 19:00 hrs
Dry day flow at time
INFLOW
Normal Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per in mile
M052
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0 0 0 0 0 0 0 0 0
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~ ~ C') C') N C\I T""" T"""
Hd9 U! MOl:!
FIGURE 10 ESTIMATION OF INFILTRATION I INFLOW
Meter Shed
IM054
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
10791
122.9 in-mi
Method 1 - Assume no III in January
Monthly Flow Data (mgd)
Annual January Peak Mo.
Average I
2004 0.198 0.175 0.264 June
2005 0.197 0.172 0.278 Oct
2006 0.183 0.184 0.264 May
III
(mgd)
0.023
0.025
(MG annual) (%)
8.40 11.62%
9.13 12.69%
0.00%
8.10%
17_52
1,543
27,033
9,011
Calculated GPD per connection
2006 rate $
Total Cost $
Annual $
Annual January Pear Mo.
Average
2004 184 162 245
2005 183 159 258
2006 170 171 245
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/30/2007 Daily Flow
Dry Day - Early Morning Flow I
Net Wastewater
181,0001gpd
76,800 gpd
104,200 gpd
3,200 19ph
Infiltration rate:
(EMFlin mil
625 gpd/in mi
Wastewater per connection:
97 gpd/connection
Peak Flow 9/20/01
Inflow per connection
23,767 gph 0.570 mgd
7,869 gph 0.189 mgd
15,898 gph 0.382 mgd
0.270
0.65 lmgd
3.59
354 gpd/connection
3,105 gpdlin mi
Peak Hour Rate: 20:00 hrs
Dry day flow at time
INFLOW
Normal Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per in mile
M054
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FIGURE 12 ESTIMATION OF INFilTRATION I INFLOW
Meter Shed
IM059
11491
142.5 In-ml
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
Method 1 - Assume no 1/1 in January
Monthly Flow Data (mgd)
Annual January Peak Mo.
Average I
2004 0.317 0.313 0.371 June
2005 0.312 0.310 0.337 Oct
2006 0.286 0.321 0.380 May
1/1
(mgd)
0.004
0.002
(MG annual) (%)
1.46 1.260;';
0.73 0.64%
0.00%
0.63%
2.19
1,543
3,379
1,126
Calculated GPD per connection
2006 rate $
Total Cost $
Annual $
Annual January pejk Mo.
Average
2004 276 272 323
2005 272 270 293
2006 249 279 331
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/30/2007 Daily Flow
Dry Day - Early Morning Flow
Net Wastewater
230,000 Igpd
100,800 gpd
129,200 gpd
4,200 Igph
Infiltration rate:
(EMF/in mil
707 gpd/in mi
Wastewater per connection:
112 gpd/connection
Peak Flow 9/20/07
Inflow per connection
57,398 gph 1.378 mgd
10,465 gph 0.251 mgd
46,933 gph 1.126 mgd
0.320
1.45 Imgd
6.30
980 gpd/connection
7,905 gpd/in mi
Peak Hour Rate: 20:00 hrs
Dry day flow at time
INflOW
Normal Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per in mile
M059
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FIGURE 14 ESTIMATION OF INFilTRATION I INFLOW
Meter Shed IM1
Estimated Residential Equivalent Connections
Inch Miles of Sewer pipe (w/o services)
77.4lin.mi
Method 1 - NOT APPLICABLE FOR TEMPORARY METERS
Method 2 - Assume early morning low flow is entirely inflitration (clear water)
May - September 2007
8/23/2007 Daily Flow
Dry Day - Earty Morning Flow
Net Wastewater
419,500 ~gpd
73,200 gpd
346,300 gpd
3,050 Igph
Infiltration rate:
(EMF/in mil
946 gpd/in m i
Wastewater per connection:
ItDIV/O! gpd/connectioll
Peak Flow 8/28/07
Inflow per connection
48,100 gph 1.154 mgd
15,800 gph 0.379 mgd
32,300 gph 0.775 mgd
0.750
1.531mgd
3.65
ItDIV/O! gpd/connection
10,016 gpd/in m i
Peak Hour Rate: 08:55 hrs
Dry day flow at time
INFLOW
Norm al Peak
Adjusted Peak
Calc. PIA Ratio
Inflow per in mile
M1
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