Additional_Site_Visit_QandAs.docx

Solicitation FA9301-14-R-0015 Wastewater Treatment Plant (WWTP) Additional Site Visit Questions & Answers

1. Question 8 how much chlorine is used in 1 day? Answer was 4000 to 7000 gallons per month. 4000x12 = 48,000 gallons per year (minimum) which is more than the 40,000 gallons per year listed on the Appendix A estimated consumables. If we average the two values and assume 5500 gallons per month then the annual consumption should be 66,000 gallons per year, about 50% larger than the Appendix A 40,000 gallons per year. Which number is correct, Appendix A or Question 8's answer?

Chlorine usage that we reported was based on chlorine purchased by the contractor. Chlorine usage is not metered. 4 to 7 thousand gallons is from a minimum and a maximum month this year. Appendix A was calculated based on last year's winter quarter extended to a full year. Usage is frequently adjusted by the contractor based on the process and operator judgment. It is not always the same. Both numbers are correct.

2. Appendix A shows 27,370 gallons of polymer which is a tanker truck every 2 months, for 1 mgd combined flow. This is a lot of polymer dose assuming it is a single product. Should Appendix A have said 27,370 Lbs of polymer (which is how it is sold)? 27,370 lbs of polymer applied to the listed biosolids quantity would indicate a high dose but not unreasonable dose. Or are there other products such as coagulants included in the total volume. Which is correct pounds or gallons?

Looks like we have a typo with the polymer used that we reported. Usage runs about 1000 gallons per year. Less can be used for wetter sludge and more can be used for drier sludge. Sludge must sit for 90 days drying. Consequently dryness and amount of polymer used is of less importance than if it was hauled immediately away at a price per pound. Units are gallons. Dryness and polymer usage can be adjusted by contractor.

3. PWS paragraphs 3.2.1 and 3.3.5 state garbage dumpster provided at the main WWTP. Question 21 and 22 states the cost is negotiated by the contractor. Facilities often put grit and screenings with the garbage. Maybe I read that AFB pays for garbage and we are supposed to pay for grit disposal? Am I correct in believing both dumpsters are the government responsibility?

In fact there are three dumpsters: one for bar screenings, one for grit, and one for regular trash. The office trash removal is paid by the Air Force. Screenings and grit removal are paid for by the contractor. Another way to look at this is that the contractor is responsible for removal of materials that come from the sewage stream.

4. In reading the answers to the amount of time that a power outage can last made me think about the fuel, care & maintenance for the generator. Am I correct in believing this is the Government's responsibility?

The Air Force provides, maintains, and funds the generator.

5. Appendix A shows 485 wet tons, attachment 2 “price proposal” spreadsheet shows 668 tons of sludge removal (assumed wet). Am I correct in believing attachment 2 “price proposal” spreadsheet?

The Appendix A bio-solids numbers are actual data based on the weight of solids hauled. 485 tons comes from two quarters last year extended to a full year. 688 tons is estimated from November of last year thru January of this year sludge production extended out to a year. Every month is different. This is the data available.

6. What useful information and functions does the Air Force SCADA computer provide?

Air Force SCADA shows which effluent pump is running and the wet well level.

7. What is the vendor's computer utilized for, types of information inputted and functions does it provide?

Local SCADA shows the influent well level, which influent pumps are running, which pista grits are running, which aerators are running, which clarifiers are running, which RAS and WAS pumps are running, RAS gallons per minute, and which sand filters are online. At AFRL - the influent gallons per minute and lagoon level are reported.

8. Where does the contractor have to go to get fuel for their company vehicles?

Off base.

9. Please provide schematic for the main plant RAS/WAS pump station, as it was not available for the tour.

The schematics for the main plant were posted with the Site Visit Information documents in FedBizOpps under “MB WWTP Board Order”.

10. At the AFRL plant:

a.) What is the mechanical condition of the large compressor?

Air pump is currently in the process of being replaced.

b.) What is the operational condition of the sand filters?

Sand filters were rebuilt and fully operational less than two years ago.

c.) How many miles is the AFRL from the Main Plant?

Approximately 30 miles; recommend using Google Maps.