HomeMy WebLinkAboutSUB202200020 Review Comments Road Plan and Comps. 2022-12-01Albemarle County
Service Authority
Serving ♦ Conserving
November 18, 2022
Brian Mitchell, P.E.
Townes Site Engineering
1 Park West Circle, Suite 108
Midlothian, Virginia 23114
RE: North Pointe Subdivision Section 2; 1on122 Submission
31d Review
Dear Brian:
The Albemarle County Service Authority (ACSA) has reviewed the above referenced plan, dated
9/26/22, and the following comments must be addressed prior to the plan being approvable to the
ACSA:
1. A Flow Acceptance letter is required from the RW SA for this project. ACSA has submitted
this request to RWSA.
2. Add the ACSA General Water and Sewer Conditions to the plans.
3. Show and label a 20' ACSA sewer easement between lots 38 and 39 and then turning and
following the northern property line east to the road ROW.
4. There appears to be unlabeled appurtenances attached to the waterline along Cliffstone
Blvd. near stations 17+00 and 22+75 (they look like a water service and meter but with a
larger hollow circle on the end). What are these?
5. On Cliffstone Blvd., shift the hydrant that is shown at 18+30 to avoid the congested area
and the reduced planting strip width.
6. The angle between the outgoing sewer and the lateral from lot 4 appears to be less than 90
degrees.
7. At the end of Steep Rock Place, extend the easement, that is around the sewer and manhole
11, to the edge of the property (following the ROW).
8. On Headland Court, could the ACSA force main be flipped to the other side of the street
to avoid the storm sewer near the connection to Cliffstone Blvd.? If not, ensure the storm
sewer is a minimum of 12" lower than the force main.
9. The easement for the sewerline between manholes 2 and 3 needs to extend 20' to the side
of the sewerline due to the depth of the sewer.
10. Shift manhole 4 so it is not in the trail.
11. Can storm sewers #14 and 418 be shifted to other side of Retreat Loop to increase the
separation from the deep sanitary sewer?
12. Along Retreat Loop, between station 13+00 and 16+50, it appears the sewer laterals
crossing the waterline are shown at a lower elevation than the sewer main. It appears these
laterals will conflict with the waterline. I think the best solution for this would be to show
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a parallel 8" sewer main that would serve lots 92 through 86 on the other side of the road
and have that line tie into manhole 3.
13. Modify the alignment of the ACSA force main in front of lots 25 and 26 so that the force
main from lot 25 connects to the ACSA force main before the ACSA force main makes a
90-degree bend to cross the road. This will eliminate the tee and the flushing connection.
Shift the water services for lots 25 and 26 to the opposite side of each lots.
14. The sewer between manholes 7 and 8 needs to be DI and needs to be pressure tested without
leakage. Add a note to the plans about pressure testing this section of sewer.
15. Shift the water meters for lots 57 and 58 so that they are not in the access drive.
16. Lower storm sewer 81 B so it crosses under the force main.
17. Lower storm sewers 81D and 81F so they are under the water services with 12" of
separation.
18. It appears that the hydrant at station 13+30 on Steep Rock Place can be eliminated. If not,
shift it away from the tee and the force main crossing.
19.On Steep Rock Court, end the sanitary force main at the beginning of lot 40. Have lot 41
connect to the force main along Steep Rock Place.
20.On Steep Rock Place, end the sanitary force main at the beginning of lot 51. Have lot 52
connect to the force main across the street from it.
21. There appears to be two water services shown for lot 52.
22. Extend the waterline that is between lots 36 and 37 so that the hydrant is closer to Pritchett
Lane. The hydrant should be in the ROW and right behind the ditch. Move the terminal
8" valve so that it is after the hydrant tee rather than before it.
23. Shift the sewer force main for lot 144 so it is 10' away from the water service.
24. There is concern about unshown utilities (electric, telecommunications, gas) being installed
over the proposed ACSA force main. Do you have plans for where these other utilities
will be installed? Could the ACSA easements for the force mains be exclusive easements
except for crossings?
25. On sheet 7, the sewer between manholes 1 and 2 needs to be DI.
26. On sheet 7D, the waterline (near station 10+00) tee and valves should be at 3.5' of cover.
Utilize two 45-degree bends to lower the waterline under the sewer. The waterline can
transition back to minimum cover after the crossing without bends.
27.On sheet 7E, show a profile for the waterline between lots 36 and 37.
28.On sheet 7K, show the manhole information for manholes 1 and 2. The sewer between
manholes 1 and 2 should be DI.
29.On sheet 7K, the sewer between manholes 7 and 8 needs to be DI and needs to be pressure
tested without leakage. Add a note to the plans about pressure testing this section of sewer.
30.On sheet 7L, in the Steep Rock Place profile, lower stone sewer 8 1 B so it crosses under
the force main.
31.On sheet 7M, in the Cliffstone Blvd. profile, lower storm sewer 136 so it crosses under the
force main.
32. There are many lots with either the force main connection or the sewer lateral under the
driveway. Wherever possible, shift these so that they are not under the driveway. This is
more critical for the force main connections.
33. Additional information is needed regarding the proposed E/One sewer system:
a. Provide design calculations showing how the ACSA force mains were sized.
b. Additional information is needed in almost all the details on the plans related to the
E/One system. Every component needs to be called out with specific manufacturer
and part information. None of these parts or materials are included in the ACSA
standards, so all the required information must be included on the plans.
c. More information is needed in the bedding detail including specifications for the
fill around the pipe and for the fill to the surface (both under the roadways and in
the grass).
d. Specify that the HDPE force mains should be PE4710, unless you are proposing to
use a different material.
e. Add a note to the tracer wire detail specifying that an access station should be
installed every 300 LF along the force main. Include product information for the
proposed access box. Remove the concrete collar for the ACSA access boxes. You
may want to consider an alternative access box design for the private boxes. A 16"
x16" concrete pad next to the lateral kit will be noticeable in front yards.
f. Revise the connection detail for the ACSA force main connecting into the gravity
manhole. The force main should transition to a 8" gravity line approximately 10'
outside the manhole. The 8" line should connect to the manhole 0.2' above the
invert out of the manhole. Include parts information on the components needed to
create a fully watertight resilient transition between the force main and 8" gravity
line.
g. Provide a detail for the force main tee (where two ACSA force main are connecting)
and for the size transition between 2" and 3". All fittings should be fused. Label
all parts and fittings.
h. In some locations where two ACSA force mains are connecting, there is a tee shown
while in other locations it looks like a sweep wye connection. Clarify which one
will be used and show that connection on the plans.
i. At the terminal end of each force main show the flushing connection separately
from the last customer connection. The customer connection should be a tee and
then the flushing connection should be at the end of the force main.
j. Add an inline flushing connection approximately every 1000 LF.
k. Revise the flushing connection details by removing the valve box and in] me valve.
Inside the box, there should be a F ball valve and then it should terminate with F
stainless steel with male NPT. Call out parts information for all parts and fittings,
including the proposed box. All fittings should be fused. Design the box so that
no insulation is needed and remove the note about insulation.
1. Provide additional information on the electrofusion saddles that will be used to
connect to the customer lines to the ACSA force main.
in. How will the taps be made into the ACSA force main? Will the customer's line be
installed up to and including the lateral kit as part of the initial installation and
included in the pressure testing of the ACSA main? Please add notes and/or a
sequence of construction to clarify all this information on the plans.
n. Provide specific information on the pressure testing that will be required for the
force main before it is accepted for service. More detail is required for the pressure
testing than "per AWWA standards".
34. Provide a landscaping plan at a F =50' scale. The F = 150' plan that was included is not
acceptable. Show ACSA infrastructure and easements on the plan and ensure that no trees
are within an ACSA easement or within 10' of any ACSA infrastructure.
Please include annotated responses to all of these comments with the next submission. If I may
be of any further assistance with questions or clarifications, please feel free to contact me at (434)
977-4511 ext. 158 or by email atjweiler@serviceauthority.org.
Sincerely,
Justin Weiler, P.E.
Senior Civil Engineer
cc: David Mitchell