Underground Infrastructure - July 2023 - 23
Rehab Technology
decreases after a peak was reached. It should be noted that
styrene thresholds peaked between 350-400 parts per million.
This measurement shows that there is an upper limit that was
validated by the field study portion of the testing.
Field results
The following information summarizes the data collected from
the two installation sites that were visited by TTC staff. Data
shows the tracing of the breakthrough time after liners were
loaded onto the reefers at the wet-out facility. For simplicity,
one example installation is shown for Tampa, Fla.
Tampa, Fla. example installation
The following table logs the liner characteristics for each of the
six installations that took place in Tampa. The truck that stored
the liners measured 1,536 cubic feet.
Installations 2 and 3 were performed on July 20, 2022, producing
a similar trend to installation 1. IMAGE 6 illustrates the
average concentration during the period in which installations 2
and 3 took place. TABLE 4 logs the readings taken when the doors
of the truck were open and spot-checking readings that were
measured from the tailgate of the truck during the installation.
The data presented above shows that the emission concentration
dipped below 40 ppm while the doors were open for the inMilwaukee,
Wisc. summary
The following table logs the liner characteristics for all 10 of the
installations performed in the Milwaukee area. The truck that
the liners were stored on measured 1,511 cubic feet.
stallation - below the recommended exposure levels from OSHA
and NIOSH. Once doors were closed, concentration increased
to 250 ppm. The spot-check readings for installation 2 matched
closely to the readings from inside the truck, while installation 3
spot-check readings were a bit lower than the truck values.
IMAGE 5. Graphical representation of the 15-mil PU liner.
UndergroundInfrastructure.com | JULY 2023 23
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Underground Infrastructure - July 2023
Table of Contents for the Digital Edition of Underground Infrastructure - July 2023
Underground Infrastructure - July 2023 - 1
Underground Infrastructure - July 2023 - 2
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