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HomeMy Public PortalAboutLetter - Wastewater Plant Storage Capacity Issue 6.23.1999PAYETTE LAkES WATER ANd SEWER DisTRicT 201 JACOB STREET. McCALL, IDAHO 83638 • OFFICE (208) 634-4111 • FAX (208) 634·7613 June 23, 1999 DI~©~OV~~ Mr. Bill Robertson r\ JUN 2 ~ 199 City Manager l.::;.I City of McCall P.O. Box 986 Re: Wastewater Plant Storage Capacity Issue Dear Bill, During the past several months, I have noticed with great interest that the City and its engineers are going through the process oftrying to identify the storage needs of the McCall Wastewater Treatment Facility as it relates to the J-Ditch Phase II upgrade project. It seems that a continuing reduction in storage volume is occurring as the City's engineers try to identify the present and future storage needs at the treatment facility. The first rationale of capacity was presented to the City by previous consultants, as approximately 360 million gallons of total effluent storage required. Whether that volume represented an accurate picture of the City's design or if analysis criteria has changed since the site issue developed, is of concern to the Payette Lakes Water and Sewer District. Since the original design volume for effluent storage has been re-evaluated, I have seen volumes projected for design anywhere from a minimum of203 million gallons to 260 million gallons of storage necessary to avoid a discharge to the North Fork of the Payette River. Because some of the estimates seemed perceptually troubling, I decided to undertake a staff study to arrive at comparative storage estimates using actual flow totals provided in the normal course of agreement communications with the City. The results of the simple analysis that was done are quite compelling to me and the Payette Lakes Water and Sewer District Board of Directors. They indicate that using the actual flow figures corning into the Wastewater Treatment Plant, during the actual period that the City would be storing treated effluent in the 1998-99 season, that a discharge of effluent would be necessary for this year, if 206 million gallons of effluent storage were constructed. There are additional factors, which could affect the total impact of storage volume necessary and were footnoted in the study but were not included in the raw data compilation. Please review this data and let me know ifI have omitted or included factors that are not appropriate when considering this issue within a proactive and responsible planning viewpoint. I will welcome any questions or comments. Thank you for your serious review. Sincerely yours, ;<.4 R.Ted Whiteman, Manager, PLWSD RTW:rtw Cc: McCall City Council Members Payette Lakes Water and Sewer District Board Members State ofIdaho, Division of Environmental Quality Bureau ofReciamation, Boise Office RH2 Engineering, Redmond Wash. Enc1: Spreadsheet Sewer Flows at McCall Wastewater Treatment Facility for the 1998 through 1999 Effluent Storage Month 01 f Storage Flow Amount to Storage Coments Jun-99 16,243,000 Reading for stored effluent from June 1st through June 15th May-99 43,758,000 Reading provided by City of McCall ..Apr-99 37,535,000 Mar-99 24,739,000 " Feb-99 18,881,000 .. Jan-99 18,684,000 Dec-98 19,969,000 " Nov-98 16,786,000 " Oct-98 15,776,000 " Sep-98 7,162,000 Reading for Stored Effluent from 9/15/98 to 9/30/98 Total 219,533,000 (Storage Capacity needed for the Period from Sept. 15, 1998 to June 15, 1999) .. Note-June Flow from the 1st to the 15th is for actual flow. Land application had not begun as of June 15th '99. It may be reasonable to add a daily flow of 1,1 million gallons for each day beyond June 15th until land application begins . .. Note-Flow figures do not include allowance for evapo-transpiration rates. It may also be reasonable to add a capacity of 10 million gallons of storage capacity, to the Bezates site to accommodate this condition . .. Note-Original estimates for completed capacity were from 359 million gallons at the Seubert site to the more recent estimate of 206 million gallons as was contemplated on the latest Bid Documents for Phase II Storage Lagoons located at the Bezates site. Assuming the 206 million gallons of storage is constructed, a discharge will be necessary. "