Q&A_IV.pdf

Q. The contractor is taking a significant risk regarding filtering based on another contractors pilot test, would you reconsider if the initial filtration did not work then additional filtration days would be covered as change order, if needed?

A. The last contractor dealt with the removal of PFOA/PFOS as a company and had a properly configured system proven to remove the required PFOA/PFOS prior to bidding. It would not be fair, in my opinion, to allow a contractor to use the project as a test and if it didn't work be compensated above and beyond. It could place some competitors at an advantage if they think they have a low cost solution and it turns out it didn't work but the one that does, after a modification, ends up being more costly than a bidder who didn't win it from the beginning with a proven system.

Q. To clarify a previous question, if we are going to be pumping 50gpm 24/7, then we would generate 72,000 gallons of liquid per day. I assumed that we would need to test each FRAC tank prior to releasing to the WWTP, so that would mean we would need more storage capacity and a lot of FRAC tanks to keep the operation going 24/7. Can you clarify? Are we just to fill up the 1 FRAC tank, stop pumping, test it, and then discharge?

A. The 50 GPM is the ultimate goal. Historically the Town has not allow us to release at that rate due to the COD level that may be present. The 50 GPM is built in just in case we end up with low COD and can release at a higher rate. We have a MAX storage capacity of 1,000,000 gallons, so if we end up releasing at 50 GPM for only 8 hours for the 36 days we will still be able to empty the product we currently have.

If not the FRAC tank will allow a longer release time, more than 8 hours without someone on site and reach the same goal.

Q. How much do you anticipate filtering per day? Batch or continuously?

A. Ultimately 24,000 gallons a day. The following is an answer to another question which may better help understand the reasoning: The 50 GPM is the ultimate goal. Historically the Town has not allow us to release at that rate due to the COD level that may be present. The 50 GPM is built in just in case we end up with low COD and can release at a higher rate. We have a MAX storage capacity of 1,000,000 gallons, so if we end up releasing at 50 GPM for only 8 hours for the 36 days we will still be able to empty the product we currently have. If not the FRAC tank will allow a longer release time, more than 8 hours without someone on site and reach the same goal.

Q. Does each FRAC tank need sampled prior to discharge?

A. The configuration is water from the lagoons passed through any pre filter (if any) then the main filters and into the FRAC tank (only one is required) and the ‘clean water’ will be discharged from the FRAC tank. Therefore, the sample must be taken from the outlet side of the FRAC tank just prior to releasing into out Sanitary System. The FRAC tank will also allow for discharge after hours as it will be filtered with filtered water prior to departing. So the sample of NON‐DETECT for PFOA/PFOS must be from the outlet side of the FRAC tank.