1. Background. The WWTP is a 17.5 MGD, Trickling Filter/Solids Contact plant, currently operating at 7.0 MGD. The City of Tolleson is seeking a vendor to provide Sodium Bisulfite (38%) by bulk shipment for use at the City’s wastewater treatment facility (the “WWTP”), subject to annual renewals. Materials purchased under the Invitation to Bid (IFB) are primarily intended to be used to dechlorinate the treated plant effluent at the WWTP. The selected vendor shall provide the safe transportation, delivery, and off-loading of material to the WWTP. 2. Quality of Materials. The Sodium Bisulfite shall be supplied as an aqueous solution of 38% concentration (+/-2%). Regular analysis shall be performed on the Materials to maintain quality control and assure that the Materials delivered to the City shall remain within the following ranges: Iron (as Fe) < 5 ppm; Heavy Metals (as Pb) < 5 ppm; Specific Gravity @ 70° F 1.331 – 1.375; ph @ 1% solution @ 70° F not less than 3.0 nor greater than 8.0; NaHSO3 between 36.0% - 42.0%. As an overriding factor, regardless of any specification stated herein, the product shall not contain compounds or elements or minerals in such concentrations as to cause or contribute to an effluent limitation in the one of the WWTP permits to be exceeded. Vendor shall provide with the Bid, the analysis and documentation of all trace metals and compounds that exist in the Sodium Bisulfite solution. Vendor shall also indicate typical pH of the solution. Product being delivered to the facility having a concentration of less than 36% or greater than 45% solution, by weight, of anhydrous Sodium Bisulfite shall be considered unacceptable and not in conformance with the terms of the Contract. In no case shall the product delivered to the WWTP possess more than a 45% concentration. Material not meeting the specifications outlined in this Scope of Service, or IFB, if known at the time of delivery, is cause for rejecting the delivery at the sole expense of the Vendor and without any additional cost to the City. Product demonstrating toxicity, or which, in the judgment of the City, may contribute to or may result in the WWTP’s permit to be exceeded or otherwise violated shall be considered grounds for the City to discontinue purchases and use of the Materials. 3. Indefinite Quantity. The resulting contract is intended to be for an indefinite quantity. The City does not guarantee a minimum or maximum amount of purchases will be requested by the City under this IFB
