HomeMy WebLinkAbout2012_06_25_Meeting Minutes_v1 PSOMAS
1075 Creekside Ridge Drive, Suite 200 • Roseville, CA 95678 • Tele: (916) 788-8122 • Fax: (916) 788-0600
MEETING MINUTES
06-Ker-178
PM R6.7 /T9.2
6TYL010100
File No. 390
MEETING TYPE: Drainage Coordination Meeting
SUBJECT: Thomas Road Improvement Program
Morning Drive/SR 178 Interchange Project
Drainage Analysis and Design
DATE OF MEETING: Monday, June 25, 2012
TIME: 1:30 p.m.
LOCATION: City of Bakersfield
Public Works Department Conference Room Conference Room
1501 Truxtun Avenue, Bakersfield, CA 93301
ATTENDEES:
Name Organization Telephone E-mail Address
Manny Behl City of Bakersfield 661-326-3576 mbehl@bakersfieldcity.us
Jim Holladay City of Bakersfield 661-326-3590 jhollada@bakersfieldcity.us
Brian Wright Psomas 916-788-8122 bwright@psomas.com
John Oliver Psomas 916-788-8122 joliver@psomas.com
ITEM
NO.
RESP
PERSON
TOPIC DISCUSSED ACTION ITEM
1 PROJECT OVERVIEW
1.1 Brian Psomas began with an overview of the project:
The Project is currently in the final design phase with
the 95% submittal due at the end of July.
The City set the right of way after the 30% submittal
and is currently in the acquisition process.
The Draft Drainage Report was submitted in April
2012.
1.2 Manny Unfortunately it appears as though Public Works did
not receive a copy of the report until May and are
currently reviewing the report.
Psomas provided a hard
copy of the Drainage
Report to the City at the
meeting.
Morning Drive/SR 178 Interchange Project
June 25, 2012, 1:30 PM
Page 2
1075 Creekside Ridge Drive, Suite 200 • Roseville, CA 95678 • Tele: (916) 788-8122 • Fax: (916) 788-0600
ITEM
NO.
RESP
PERSON
TOPIC DISCUSSED ACTION ITEM
1.3 Brian Changes since the Preliminary Design Phase:
· The drainage concept is the same, however more
geotechnical infiltration testing indicated a much
slower infiltration rate than what was previously
reported. The result is that the infiltration basins are
now converted to detention basins.
· The project includes two detention basins (Basins
#1 and #2) within Caltrans right of way and one
retention basin (Basin #3) within City right of way.
1.4 Manny The City asked if they could get a copy of the
infiltration test results.
Psomas provided a copy of
the geotechnical report to
the City at the meeting.
1.5 Manny The City requires testing in each of the basin
locations. The boring depths should be 3 times the
ponded depth.
1.6 Brian Additional infiltration testing is to be completed on
the western side of Basin #2 and in the new location
for Basin #3.
2 DRAINAGE DESIGN
2.1 Brian Psomas had sent a Technical Memorandum to the
City on 6/19/12 summarizing the drainage criteria and
challenges with the proposed design mainly as a result
of the infiltration test results.
2.2 Brian The following criteria were used in the drainage
design:
Design Storm: The design storm is the 100-yr 24-hr
storm event per agreement between Caltrans and the
City.
Drainage and Water Quality Requirements: There are
several requirements that we are trying to meet in
terms of storm drain management and water quality
management, including:
• Treating 90% of the total WQV and maximum
drawdown time of 96 hours.
• No increase in total peak discharge into Shalimar
and Breckenridge Drainage Basin Plans.
• No increase in total runoff volume as a result of the
project.
2.3 John In order to meet the Caltrans drawdown time of 96 hrs
for the WQV we have included 4” perforations in the
corrugated metal pipe riser. This increases the total
runoff volume for the project.
2.4 Jim/
Manny
The City will accept an increase in total runoff
volume provided the 4” perforations are set at an
elevation that will retain all water for the 5 yr storm
event.
Psomas to adjust 4”
perforations to
accommodate the 5yr storm
event.
2.5 Manny Basins should have a 12 ft access road around the Psomas to adjust Basin #3
Morning Drive/SR 178 Interchange Project
June 25, 2012, 1:30 PM
Page 3
1075 Creekside Ridge Drive, Suite 200 • Roseville, CA 95678 • Tele: (916) 788-8122 • Fax: (916) 788-0600
ITEM
NO.
RESP
PERSON
TOPIC DISCUSSED ACTION ITEM
perimeter and 2:1 max slopes. from 4:1 to 3:1 slopes to
increase the bottom area of
the basin.
2.6 Brian/
John
Was the 60” pipe and Breckenridge Trapezoidal
Chanel designed to handle all the runoff from the
Breckenridge Plan shed area to the NW of this
location?
2.7 Jim/
Manny
The City confirmed that this system which was
recently completed as part of the Ball Park project
was designed to handle the runoff from the
Breckenridge Plan shed area to the NW of this
location.
2.8 Jim The Breckenridge and Shalimar plans generally have
no outfalls. Instead, runoff is routed to basins where
it diminishes via infiltration and evaporation.
3 OTHER ITEMS
3.1 Jim/
Manny
The City no longer uses the Dynamic Vortech
separator. The City does not require us to place this
before the outfall of Basin #3. The basin itself will
function as the water quality treatment BMP.
3.2 Brian Does the City only have the Type B manhole detail? Manny to provide
additional manhole details.
3.3 Jim At the intersection with Panorama Drive, the manhole
should include a 36” pipe east, a 30” pipe north, an
18“ pipe west.
Note: These minutes are preparer's understanding of items discussed at the meeting. If discrepancies are noted,
please contact the preparer within three days of receipt.
Prepared by: Brian Wright
Distribution: File 390
Jason Lemons, TYLin
Masis Kayaian, Caltrans
Attendee List