HomeMy WebLinkAbout10.01 OWTS Capacitybuo- 918
July 12, 2012
Jeff Johnson
Johnson Carter Architects,PC
136 East Third St., Suite B
Rifle, CO 81650
RE: As -Built On -Site Wastewater Treatment System (OWTS), Bayou Well Services Building Expansion,
Parcel 2, Green Subdivision, Rifle, Colorado
SE Job No. 11084.01
Dear Mr. Johnson:
Pursuant to County Regulations, this letter provides documentation that the new and expanded Onsite Wastewater
Treatment System (OWTS) recently installed is in general compliance with the permitted design. Sopris
Engineering has performed site visits to measure, inspect, and document the as built conditions of the constructed
system. We have coordinated our efforts with the system installer. The systems were inspected prior to
backfilling and after component installations were complete. The as -built conditions and installation of the new
OWTS components is in compliance with the permitted design specifications for the new and expanded system.
The OWTS systems were constructed in accordance with the design recommendations and specifications delineated
on the design plan, C-4, Utility and OWS Plan, by Sopris Engineering, dated 8-23-11.
The improved site includes a new East side facility addition with plumbed office space that is served by a new
OWTS system. The original West side facility and plumbed office space is served by the existing expanded OWTS
system. The combined systems were designed based on an average flow of 1520 gpd and a peak sewage flow of
2280 gpd calculated by the per capital usage of employees and transient population.
Facility Usage
Employees/transient daily Capita
Facility description
Well Service
Truck
Maintenance
Job desription
Office, Shop,
Crew
Drivers,
Transient
Existing
#
Max. 24 -hours
Proposed
#
Total
#
/capita
Usage
gpd/cap
Avg Rate
QA
gpd
Peaking
Factor
#
Design
QD
gpd
WEST
EAST
Combined
Daily fulltime
office
7
14
21
15
315
1.5
472.5
Infrequent parttime
Temporary
8
0
8
5
40
1.5
60
Daily fulltime
shop
13
13
26
20
520
1.5
780
Max. Daily
Transient
Crew & Drivers
20
94
114
5
570
1.5
855
Infrequent
Guest visitor
2
10
12
5
60
1.5
90
Infrequent
Delivery
0
3
3
5
15
1.5
22.5
Existing +
Proposed
50
1520
1.5
2280
Design Calculations
The design flow is calculated for the subject facilities as shown in the table above based on usage descriptions and
per capita flow rates from the State I. S. D. S. Regulations.
502 Main Street • Suite A3 • Carbondale, CO 81623 • (970) 704-0311 • Fax (970) 704-0313
SOPRIS ENGINEERING • LLC
civil consultants