composite sampling meeting with RJN and malasari - 11 03-march 2026

Date: 2026 03-March 11

Stiles

• Spencer Belcher - Loosahatchie sampler - occasional access issues due to mud
• Spencer Belcher - Wolf river sampler - no sampler run this week, to test if the river will back up into the hole, at this river stage. The booster pump might become submerged.
• Mac Compton - Duratracker meter used at wolf river sampling site
• AECOM - What would the city like to see from composite sampling results?
  • Series of data points
  • wolf river flow based sampling
  • 24 hour time based, but not the original / ultimate goals
  • H_2S - temporary conduit flexibility
    • Spencer / Tioga is removing the booster bump, so sealing is threatened, due to flooding events
    • Spencer: flow based sampling has been threatened because the waste water comes up and ruins the devices, so they are removed, inconsistently
    • Mac Compton / RJN - The meter and Duratracker was once stolen, from the truck at a gas station
• Februrary and January DMR status: Through Janurary confirmed for Stiles

Maxson

• Presidents Island
  • Battery went out for a period on "Habor" meter, Presidents Island
    
  • Mac - they switched out defective sensors and put on an uninterrupted power supply
• Nonconnah,
  • NIS is working like a champ - Spencer
• NO020114, bypass manhole -
  • auto sampler that runs off of booster pump, has a grease plug - Spencer. H2S is high, well over 1000 ppm even when there is not a grease plug, around the manhole at that location.
  • Mac - depth but not velocity.
  • 
  • It has been surcharged for a period and has a grease plug
  • Malasari - this site has never been able to run as anticipated. SHould we stop counting on it?
    • Mac - when flows are reduced on Nonconnah line, they will try to put another area velocity meter (not a non contact meter), downstream of N9
    • Spencer - for the project, only 9 samples have been pulled successfully. There are multiple failure modes - grease plugs surcharging as well as hydrogen sulfide
    • Mac - this meter was first installed in April 2025
    • Spencer - this was where the collapse was at
    • Odell - Pivot to another collection site? It would be great to have data here, but we could switch to another manhole
    • Mac - let's check the "other manhole" (?), for a short amount of time, then consider alternatives to get usable flow metering
• Horn lake 104
  • Has a grease plug - spencer
  • flow monitor is running low - it stays on zero for several minutes, though it appears to read
  • Switched to load based sampling
  • removed whole battery yesterday
  • When surcharged, the battery and equipment falls off of the manhole
• horn lake 150
  • 
  • Might relocate downstream of N9
  • 
  • In a holding pattern until Maxson can reduce the flow so that they can get in for the installation
  • The meter has been ordered. Expected within a week. The previous meter was stolen, out of the truck, worth $30k
  • Carl Stevenson - when can the flow be reduced for installation.
    • We lost a course bar screen
    • In the rain, handling getting flows down and prepped
    • 9-10 days target
    • Carl Stevenson will confirm with Clayton Bennett to collaborate with Mac Compton concerning when they receive the replacement meter
• 107 - new manhole