The project scope includes the following major items:
- The construction of a fourth anaerobic digester tank with a reactor volume of 3 million gallons (3 MG) to provide additional digestion capacity, redundancy, and operating volume versus existing Digester Nos. 1, 2, and 3.
- A dedicated digester mixing system for proposed Digester No. 4 which will consist of an externally pumped, hydraulically mixed nozzle system that will mix the digester contents using hydraulic jets.
- A cooling heat exchanger to maintain optimum process temperatures for proposed Digester No. 4.
- The construction of a WAS Storage Tank (WASST) adjacent to the existing Pre-Dewatering and Thickening Building with a volume of 301,600 gallons to provide a control point between pumping WAS from the existing Final Clarifier Nos. 1-12 to the Gravity Belt Thickeners (GBTs). The WASST will convey flow to the GBTs via a GBT Feed Loop system which will include pumps, piping, supports, and associated hardware.
- A chemical feed building located near proposed Digester No. 4 to house an alkalinity feed system which will send flow to the existing Digested Sludge Storage Tank (DSST).
- Installation of Pre-Dewatering Centrifuge No. 6 along with all associated equipment, such as Centrifuge Feed Pump No. 6, Thickened Cake Pump No. 6, and Polymer Feed Pump No. 6.
- The construction of a DMX Reactor System and all associated subsystems to reduce the nutrient loads returned to the influent of the CRWS Treatment Plant.
- A Sidestream Treatment Building to house all the pumping equipment, electrical gear and miscellaneous items associated with the DMX Reactor System.
- Demolition of offline structures, such as Primary Clarifier Nos. 1 and 2 along with any associated yard piping, manholes, pull boxes, conduit, drainage systems and appurtenances.
- Installation of proposed yard piping, conduit, duct bank, drainage systems, general site improvements such as temporary erosion and sediment controls, grading and resurfacing, and paving.
## Details
**Bid/Project ID:** 3110.2164
**Type of Work:** Wastewater Treatment Process Improvements
**Pre-Bid Location:** 5300 S. Collins St., Arlington TX, 76018
**Pre-Bid Notes:** One mandatory pre-proposal meeting will be conducted at the Trinity River Authority's General Office at 5300 S. Collins St., Arlington TX, 76018. Following the pre-proposal meeting, at 2:00 PM, one mandatory Pre-Proposal Site Visit will be conducted at the Trinity River Authority's Central Regional Wastewater System Treatment Plant, 6500 W. Singleton Blvd., Dallas, TX 75212. Prospective Proposers are reminded that all visitors attending the site visit MUST have work boots, hard hats and safety vests in order to walk through the plant facilities and buildings. No exceptions.
**Bid Location:** CIVCAST website (www.civcastusa.com)
**Bid Notes:** Owner will publicly acknowledge receipt of all Proposals via conference call starting at the time and date stated above. Proposers and interested attendees can call 1-866-390-1828 and enter the access code 6046502#.
**Engineer/Publisher:** Trinity River Authority of Texas
**Engineer Address:** 5300 South Collins, Arlington, Texas, 76018-1710
## Additional Notes
All documents and Q&A for this project will be hosted on this CivCast site and NOT the Price Proposal CivCast site.
Entry List procedures: Anyone wanting to attend the Pre-Proposal Site Visits must give 24 hours prior notice to Theo Chan, chantw@trinityra.org, 817-832-5231, providing name, company representing, purpose (Pre-Proposal Site Visit).
Directions for the Pre-Proposal Site Visits: Call 24 hours ahead of meeting as mentioned above, then enter the treatment plant by showing ID to security guard. Indicate to security guard desire to reach the Administration Building and enter the plant using the left entry gate. Take the first right and continue to follow the road down the hill into the parking lot. The Administration Building will be on the left, the building with flags in front.