DDW-2024-007196

COMMENT RESOLUTION FORM
CICWCD - WIP2022 CONCRETE TANKS - EIGHTMILE HILLS 4 MG TANK
Comment Resolution Responder Date
The “DRAFT” stamp needs to be removed from the plans and specs and submitted
and final/ready for construction
A finalized submittal of the Plans and Specifications will be
provded without the "DRAFT" stamp.RJL 3/15/2024
Is the chlorinator just a booster chlorinator? If so, I will have to ask the DDW about
Point of Entry (POE). I think the analyzer would be good, but do you know if all the
wells will pump directly to this new tank or do they go through the distribution
system? The reason I ask is because you mentioned there are already POE sample
sites, which they probably don’t have already, since older chlorinators do not have
these designated, but I know all these wells have existing chlorinators, or are they
planning on removing them and using this one exclusively?
Yes, the chlorinator is just a booster chlorinator. All wells
currently pump directly into distribution and are treated at
the well location. They are all approved and meet the
required contact time prior to delivery. The wells are
monitored and tested as required to ensure that the correct
chlorine residual is met. The current monitoring sites will be
kept and additional sites will be added to ensure residuals
are met outside of the proposed tank.
RJL 3/15/2024
The question sheet for the chlorinator that I sent you shows that the dose will be 5
mg/l, which is above the Maximum Contaminant Level of 4 mg/l for chlorine. Did you
mean 0.5 mg/l since the required level is only 0.2 mg/l at the POE?
The proposed design target dose is 0.5 mg/l (measured as
free chlorine).RJL 3/14/2024
Separate switches are required outside of the chlorine room for fans and lights? Does
the design have separate switches for each?Seperate switches have been added for the fans and lights.CJP 3/14/2024
It appears that the air intake louvers are located near the ceiling. However, I could
not tell whether the exhaust fan is drawing from near the floor (it appears to
discharge through the roof vent). I just want to make sure this is the case.
Both exhaust fans draw from the floor. Ducts are intalled
down to 4" above finish floor. See Sheet BP3 and Key Note
3 on Sheet E401.
RJL 3/14/2024
I could not find in the plans where the required slope of the roof and floor is
indicated. This should be shown in detail so that drainage is obtained.
The roof and floor slopes are 2%. Both slopes are specified
on B/S5. The roof slope is also specified on A/S8. The floor
slope has been added to A/S2. Additionally, this
information has been added to the design criteria table on
Sheet G5.
EL 3/14/2024
The air vent pipe penetration detail G on Sheet S9 shall meet the following from the
rule:
"Vent pipes, in addition to seepage rings, shall have raised concrete curbs that direct
water away from the vent pipe and are formed as a single pour with the roof deck."
The Tank Roof Vent detail G/S9 has been updated per
requirements.EL 3/14/2024
The air vent detail G on Sheet S9 does not show how high above the tank surface it
needs to be. This dimension should be added.
A minimum height requirement has been added to the Tank
Roof Vent detail G/S9.EL 3/14/2024
The access hatch details D on Sheet S10 needs to have enough detail to show the
minimum requirements that it is raised up at least 4 inches above the concrete curb,
with a 2-inch shoebox close fitting downturn, lockable, and has a gasket on the
underside with no penetrations through the hatch lid.
We have confirmed that detail D/S10 satisfies
requirements.EL 3/14/2024