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Home My Public Portal About06.08.98 COW AgendaRichard A. Rock PRESIDENT tRUStEES Jay D. Darnell VILLAGE OF PLAINFIELD Ka by oho ne~l WILL COUNTY'S OLDEST COMMUNITY Steven L. Rathbun Raymond 5molich RKSHOP OF THE PRESIDENT AND BOARD OF TRUSTEES Kurt 5talzer HELD ON MONDAY, JUNE 8, 1998 Susan Janik AT THE VILLAGE BOARD ROOM VILU40E CLERK 23145 W. LINCOLN HIGHWAY, PLAINFIELD 7:00 P.M. 1) CALL TO ORDER, ROLL CALL, PLEDGE. 2) MINUTES -Approval of Workshop Meeting Minutes, May 11, 1998 3) TAX INCREMENT FINANCING -Several discussions have been conducted with local business interests in the downtown. The consultant, Tyrkla, Pettigrew, Allen and Payne, is collecting data and initiating inspections of our downtown in an effort to gauge our compliance with the Statute and the focus for the size of the district. Representatives of MainStreet will be in attendance at the meeting to express their concerns and support for the TIF project. It is also time for us to begin thinking of the types of priorities we want to accomplish with the TIF, ie. Parking, facade improvements, common signage, infrastructure upgrades, new construction, etc. The overall principle should remain as "Increasing the assessed value and long term retail viability of the downtown." 4) VILLAGE HALL PLANNING -Attached is a memo from the Administration regarding the initiation of the planning process far a new Village Hall. It is time far this question to be raised and for us to collectively set about some direction. S) ANY OTHER BUSINESS. DEFERRED ITEMS Personnel Policy Downtown Competition Implementation Joint Meeting with Plan Commission Infrastructure Maintenance Fee MainStreet Status Economic Incentive Target Areas Impact Fee Analysis C~ 23145 W. LINCOLN HIGHWAY • PLAINFIELD, ILLINOIS 60544 • (815) 436-7Q93 • Fax (815) 436-1950 JUL.. $.199$ 4~51PM WALTER DEUCHLER INC N0.790 P.2i10 VILLAGE OF PLAI~NFIELD NEW WASTEWATER TREATMENT PLANT PRO.~ECT DEVELOPMENT STATiJS OUTLINE FDR VILLAGE BDARD PRESENTATION MONDAY, JULY 13, 1998 7;OQ pm I. MAJOR PROGRAM DEVELOPMENT STEPS A. Funding Qptions I. CpStS 2. Regulatory Requirements 3. Scheduling Considerations B. Planning C. Design D. Permitting E. Construction II. CURRENT FLOW MONITORING PROGRAM A. Purpose i , Regulatory 2. O & M costs 3. System Reliability B. System Summary C. Current Ite5ult9 Increased I&I from 1981 2 month storm extrapolation III. I & i REDUCTION A. Flow Monitoring Additional Monitors to achieve flow balance Extended Monitoring Period to capture Larger rain event Refine estimates of I & I S. SSES Identify and Quantify I&I Sources Define Repairs Cost Effectiveness -Transport & Treat vs. Repairs CJ JUL. 9.1998 ~~06PM WALTER DEUCNLER INC • • WALTER E. ^EUCHLER ASSOCIATES INC. Consulting EngFneers 230 WOApIr-wpl AvGNUE • 7ELE~HONE (630) 897.465 • Fnx (690) 897-,5696 Mr. Allen Person Wastewater Superintendent Village of Plainfield 23145 W. Lincoln Highway Plainfield, Illinois 60544 AuRORh, IGUnois 60566 July 9, 1998 RE: sanitary Sewer Flow A.nalyais Flow Monitoring Summary W.ir.D.A„ Job # 444-98013-00 Dear Allen: N0.807 P.~i6 We are pleased to provide you with this summary report of the results of the recent sanitary sewer flow monitoring performed on several key interceptors in the Village. The monitoring indicates that the amount of inflow and infiltration in the system has generally increased throughout the system since 1981. These results should be accepted cautiously however, as they are based on flow data resulting from raint'all events which produced less than desirable amounts of precipitation. One of the major purposes of this flaw monitoring program was to determine if the amount of inflow and infiltration in the system has changed significantly from that identified in a 19$1 Sewer System Evaluation Survey (SSES) performed for the Village. This will provide direction to the Village iia, determining the appropriate course of action relative to maintaining existing service and plawring future improvements. A total of eight (8) flow monitors were installed on major interceptors throughout the Village as indicated on the attached location map. Monitors M.L. # 1, #2, #3, #5, and #6 were located to provide a direct comparison to data generated in the 1981 SSES. The most significant storm event during the flaw monitoring period occurred during May 6th, 7th and 8th. This storm produced 1.57 inches of rainfall over a 29.5 hour period. This is a storm event with a statistical recw.xence interval of approximately 2 to 3 months. This event produced significantly less rainfall than is typically used to project the anticipated flows for a storm event with a recurrence interval of 5 years. As noted in our letter of May 15, 1998 (copy attached), this yields potentially inaccurate results. The results ofprojecting the flows from the noted rainfall indicate that significant amaunts of ii1flow anal infiltration are entering the sanitary sewer system, As noted on Exhibit 1, each of the five monitoring locations used in the 1981 SSES exhibits an increase in the rate of inflow, based on a five year storm. This indicates that cost effective solutions identified in the 1981 SSES may no longer be sufficient. Potentially more sources of inflow have developed in the system over time or the existing sources have further deteriorated. • Water Works and Sewerage • Buildings and Structures • pesign and Construction • Streets and Street lighting • Investigations and Reports • Project Financing 9.1998 2~06PM WALTER DEUCHLER INC N0.807 P.3i6 Mr. Allen Person Village of Plainfield July 8, 1998 Page 2 Exhibit 2 indicates the magnitude of the increase in the rate of inflow at each of the five locations. The tncrnace~ ranges from a low of about 10% increase inflow at locations 5, to a high of over S00% at location 1. Based on this information, it is anticipated that the IEPA will require some action be taken to reduce inflow and infiltration within the existing system prior to i55uing permits related to a r~ew wastewater treatment facility, Exhibit 3 indicates the projected flow resulting from a five year stoma compared to the capacity of the interceptors. This indicates that the following three interceptors do not have sufficient capacity: 1$ inch interceptor along I7.S, 30 (M.L. #2) 21 inch interceptor serving the northern part of the Village (M.L. #3) 30 inch main interceptor bringing flow from most of the village to the existing treatment plant (M.L.#~ These f gores are based on existing development acrd do not reflect increases in flows resulting from future development. We trust you will find this summary report beneficial in determining the general status and scope of the recent flow monitoring, Our complete report, providing greater ~~ for each of the monitoring locations, will be forthcoming, Should you have any questions, or need additional information, please do nvt hesitate to call cne. Very truly yours, WALTER E. D1i7CHLER ASSOCIATES, INC. r~~ William G. Nelson, P,E. Project Manager WGN/mw cc; Philippe Moreau, WEDA CJ JUL. $.1998 4~5~PM WALTER DEUCHLER INC .) _~ 7 S __ 1 ~' ._~ _ .~:. ~ w ~„ - - -•--- ... 9~ -- - - -- .s _ ~ .~ •. - • N7ra ii~FYT 6 ~ -° --- -... ~ ~ .._._. _.... ___ R ~ ~ _ ....._ . ML #2 _L 1 '. ~.__- ---~G~ ~r e' _ ., i g -_~~~~ ~. - ... ..--- ~.~Q r N~~ 90 ~I~~ 1 fa~/ ~~ ~~T - J °° - .- ~ i L'~ :~ ~~- ~~ • JUL. 9.199$ 2~05PM WALTER AEUCHLER INC w ~~ 'W I~ ~ ~ ,~ ~ ~a ~- .z ~ IQ o ~~ J ~z ...~ LIJ .~ ~1. Z ~~ ~~ I~ N0.807 P.4i6 eq cn a~ a ._..__. .__ "' i 0 j r o w ~. ~, ~ ~k ~ ^ ~ r ~ ~~ ~a ~ ~ ~ , ~ o o .~ ~ ~- ~ ~ V ~ r CD C3~ r N r z a 4 r O • W ~. d' M (V ~ p ~aJW~ MOId JUL. 9.1998 2~07PM WALTER DEUCHLER INC ~°• -- . i i• ~ ~ ~ W U ~y ;~ W ~ a O ,,,., ~ ~ Z z 0 N0.867 P.5i6 ~° a ~ ~ ~ `t N Q `"'r , ~JNdH~ MC~~~NI i• m rn 0 n a M~ `Y~ N a i C7 z r M r ao wt v v u~ JUL. 9.1998 ~:07PM WALTER DEUCHLER INC 3~- ;H ~~ ~ ;~ ~ ~~ a iQ ~ ~~ ~ '~ ~ W w ~~ ~ 'W i~ N0.807 P.6i6 ""` ~^ r , V Q U' ~ Wi C] ~ 0, , o ~ z ~ o "' , a ~" ~ ,J v ~- ~ ~ Q i w- r~ h v W s a z 0 0 s O QD Cfl d' N Q ~4JW) MOIL .7UL. 8.1998 4:S4PM WALTE=R AEUCHL.ER INC VVALT~ER E. ®EUCHLER ASSOCIATES INC. Consulting Engineers • Z3q WODOUwn AveNUE TEt.~rMaN~ (63x1 e9~.+i651 • Fnx (630j 897-Sfi96 AuRC7ua, I~uHois 60506 May 15,1998 r ~ ~~ Mr. ,Allen Person wastewater Superintendent Village of Plainfield 23145 W. Lincoln 13ighway Plainfield, Illinois 60584 RE: Sanitary Sewer Flow Anaipsi9 Rainfall Data W.EJ7.A. Job # 498013-00 near Allco.: N0.790 P.9i10 As we discussed, the recent stoiQns of May 5 through May S did not produce sufficient rainfall to provide adequate projections of inflow and infiltration in the saaita~y sewer system. The ILpA, requires that I/I be calculated based. on a five year r~ecs~rnence interval storni event Tt is our opinion that projecting the UI, based on the data collected from this early May raiafal,l will result iii, sign%ficaat inaccuracies and will not be acceptable to the lE'PA. We recommend that the monitoring period be eatte~nded in as attempt to catch a more sigaifcant storm. I A five year rerccnrence interrval stoma, in the Plainfield area produces approximately 3.95 inches of rain in a 24 hour period. The recent storm. produced a metal. of 1.57 inches in about ?.9'/: hou>ws. This is slightly less than a 2 month recum-tact inte~cval storm, ,Iu, order roo pmject t3ais to a S year storm, a scale factor of over 2.5 would have to be applied to the flow data This potmtially~results in gross inacnuacies in the estimation of TR enteruig the system. For example; poteta#ial sources vfinfl,oRr, such as Stoma scw~er overIlows, may not have confuted any flow to the storm sewer system in the 2 month storm.. 'T'hese sources would not be adequately accounted for by simple increasing flow data oa a linear basis using a scale factor. This would lead to underestimation of the inflow actually impacting the system. Qn the other hand, some sources of inflow, and pote,atiaIIy infltration, ~y not coatn"hute flow to the system at any gteaber' rate dtuing a more intense storm than they dial. for the recorded 2 month stornz. However, a direct 1mear m~-a~ in flow data from a 2 month storm to a 5 year smarm wnnld indicate an increase in these sources of over 250%, Leading to as overesti~natioa of these sout+ce. There will always be some level of estimation involved in determining the amounts and sources oa inflow and infiltration, However, the extent of the inaccuracies which could result from attempting to estimate TR using oaiy the 2 month storm data, could result in ina$ective allocation of resources, • water Works and Sewerage • Buildings and 5irutturcs • Design and Construction • Streets and 5treel; Lighting • Investigations and Reports • Project Financing ' '"' ~-7UL . 8.1998 4 ~ 54PM Nlr. Allen Person Village of Plainfield May 15, 199$ P e2 WALTER DEUCHLER INC N0.790 P.10i10 a$ . ~_ .r T trust you will ~d tlris iron helpfiil. The flow monitors have been lets in plate in accordance with, our May 4,1998 letter. If this is n+ot consistent with the village's desires, please let us kaaww. I will continue to stay in touch with you on a zegulaz basis to assoss the data collecdon status and. determaine the earliest practical time far rmtoval of the monitors. Should you have any questio~q,5, or need additional infomaata,or~, please da not hesitate do call zne. Va3' truly yotns, VV'ALTER E. DEUC~I..TR ASSOCIATES, INC. ~~ ~ l~ ~' William G. Nelson, Pte. Project Manager WGN/mw '~ ~J