HomeMy WebLinkAboutCT 98-14; Thompson/Tabata; Tentative Map (CT) (89)WILSON ENGINEERING
DEXTER S. WILSON, P.E.
ANDREW M. OVEN, P.E.
STEPHEN M. NIELSEN, P.E.
MEMORANDUM 615-006
To: Gregg Linhoff, Standard Pacific
From: Andrew Oven, Wilson Engineering
Date: September 10, 1998
Subject: Offsite Sewer Analysis for the Thompson Property in
Carlsbad
The proposed Thompson property development is located in the southwestern quadrant
of the City of Carlsbad. It is east of Interstate 5 and on either side of Poinsettia Lane
west of Alga Road. It is bounded on all sides by existing single-family residential
development.
The purpose of this memorandum is to provide the results of our preliminary offsite
sewer analysis. This analysis was done to verify that existing gravity sewer system
lines south of the Thompson property will have sufficient capacity to accommodate
flows from the proposed development.
The proposed Thompson property development and surrounding areas gravity sewer
to the existing North Batiquitos Sewage Lift Station. This sewage lift station has been
upgraded within the last two years to provide sufficient capacity for this entire service
area. Therefore, there is not a concern about pumping station capacity for the
proposed Thompson property project.
However, the January 1992 Sewer Master Plan for the City of Carlsbad identified a
trunk sewer improvement south of the proposed Thompson project. Since the
7O3 PALOMAR AIRPORT ROAD, SUITE 3OO • CARLSBAD, CA 92OO9 • (760)438-4422 • FAX (76O) 438-01 73
Gregg Linhoff
September 10, 1998
Page 2
Thompson property is one of the last to be developed within this portion of the sewer
basin served by the North Batiquitos Sewage Lift Station, it is necessary to insure that
additional flows generated by the Thompson property project will be accommodated
within the existing gravity sewer system.
Exhibit A attached to this memorandum shows the computer model sewer system
which was used to evaluate available capacity in the existing system. Two computer
run printouts are attached for your review. The first shows the existing system
without the Thompson property, and the second shows the existing system with the
addition of the 268 proposed single-family dwelling units within the Thompson
property project. This second computer runs models the buildout condition for this
portion of the North Batiquitos Sewage Loft Station gravity sewer basin.
The results show that under ultimate conditions the maximum depth-to-diameter ratio
within any reach of the gravity sewer south of the Thompson property is 0.71. This
means that the pipeline is 71 percent full by depth. Typically for existing systems, a
pipeline that is less than 75 to 80 percent full by depth is considered to be acceptable.
Therefore, our conclusion is that no further upgrades are necessary within this gravity
sewer basin upon buildout of the Thompson property project.
This conclusion is consistent with the conclusion reached by the North Batiquitos
Pump Station Service Area Report prepared by Wilson Engineering, dated October 23,
1992. This study concluded that based on the Master Plan buildout of the basin the
maximum depth-to-diameter ratio within the gravity sewer would be 70 percent.
Please let us know if you have questions regarding the information presented or if you
need additional information or analysis.
A0:lb
Attachment
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SEffiR ftMlYSIS SANITARY LOA& APPLICATIONS
City of Carlsbad - Thospsen Property Sewer Analysis
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ER "ANALYSIS SANITARY LOAD APPLICATIONS
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