1991 AGN FEB 05 I18 - Laserfiche WebLink

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K S -STEL No. 369 502 . Jan 31 , 91 10:47 P.02/02 KQ1EGEQ_ INCORPORATED • ENGINEERING CONSULTANTS i 111 W 1 3602 Unlver" Av * Riverside, CA 92501 . Tel 714-684-6900 • Fox 714-3695026 January 31, 1991 000-42,8 John C. Hutton, Director of Public Works City of Colton 650 North La Cadena Drive Coltun, California 92324-2897 Subject: Secondary Wastewater Treatment Plant Expansion Phased Design and Construction Dear Mr. Huttun: It is necessary for the City to proceed immediately with expansion of its secondary wastewater treatment facilities for two reasons: 1. To comply with the new Total Inorganic Nitrogen (TIN) limit specified in the City's waste discharge requirements. The limit becomes effective in July 1992. The Gity does not have any existing treatment facilities designed to remove nitrogen from the wastewater. 2. To provide additional secondary treatment and solids dewatering facilities to acconu«odate new development. The existing secondary facilities are operating at approximately 90X of design capacity. Based on development currently proposed within. the Cities of Colton and Grand Terrace, we now estimate that wastewater flows will reach Plast capacity (6.4 MGD) in 1994. The proposed solids dewatering facilities would eliminate the need for the City to construct additiuual beds, sludge piping, and sludge and underdrain pumping facilities, and acquire additional property for said facilities. As indicated in the revised project schedule we prepared dated October 29, 1990 (copy attached), we estimate that it would take approximately 40 months (February 1991 through May 1994) to design, construct, and begin operation of all described treatment facilities (3.0 MGD capacity) described in our proposal dated July 30, 1990 (Executive Summary attached). However, to expedite the design and constrijction process and attempt to weet the July 1992 deadline for TIN limit compliance, we now propose to phase the engineering and construction services, and pre -negotiate and award certain critical aeration, pumping, and electrical equipment. The