B23-1440 - 33572 VALLE RD 111/14/24
ATTN: LESLIE KNITTLE
DATE:EMAIL:
APPLICANT/OWNER NAME:
JOB ADDRESS:
DEVELOPMENT NAME:
PHASE:
TRACT(s):
LOT(s):
UNIT(s):
CONTACT NAME:
CONTACT PHONE:
COMPANY NAME:
TRACT LOT UNIT
TOTAL SQUARE
FOOTAGE
PREPARED BY: LISA LA
PHONE: 949-443-6349
ADDRESS
NEW RESIDENTIAL
ROOM ADDIT,ONS
CITY OF SAN JUAN CAPISTRANO
SCHOOL FEES WORKSHEET
COMMERCIAL/INDUSTRIAL
CUSD FAX: (949) 493-3728
LLA@SANJUANCAPISTRANO.ORG
TOTAL SQUARE FOOTAGE
PROJECT INFORMATION
SQUARE FOOTAGEAPN
RUSSELL PRICE
33572 VALLE RD #1
RUSSELL PRICE
949-289-5785
✔
33572 VALLE RD #1 675-341-01 912
912
912
1/23/24
November 21, 2023
Mr. Russell Price
33572 Valle Road
San Juan Capistrano, CA 92675 GMU Project No. 22-148-00
Subject: Septic System Capacity, Residential Room Addition, 33572 Valle Road, San Juan
Capistrano, California – Permit No. B23-1440
Dear Mr. Price,
This correspondence is to provide updated information pertaining to the septic system capacity with regards
to adding additional flows from a one-bedroom residential room addition to the existing septic system. The
addition of one bedroom will increase the total number of bedrooms to 6. The existing septic tank has a
capacity of 1500 gallons, which is adequate per the current code for 5 to 6 bedrooms.
Since no percolation test report was prepared for the site within the past 10 years, a percolation test was
performed at the existing seepage pit currently being used at the property. Based on the testing, a
percolation rate of 1.20 gallons/square-foot/day was obtained. The total percolation area of the existing
seepage pit, after using the required 50% reduction in capacity, is 848 square feet. Therefore, the
percolation capacity is 848 square feet x 1.20 gallons/square-foot/day or 1017 gallons/day.
Based on the typical estimate of 150 gallons/day of wastewater per bedroom, the addition of the one-
bedroom addition to the existing system will now result in 900 gallons/day of wastewater (i.e., design for
6 bedrooms).
Based on the above information, the existing septic tank has a capacity of 1500 gallons which is adequate
for 6 bedrooms. Additionally, septic pit capacity (i.e., 1017 gallons/day) exceeds wastewater needs for 6
bedrooms (900 gallons/day); therefore, no additional percolation capacity is required for adding the one-
bedroom residential room addition.
Should you have any questions, please feel free to contact our office.
Sincerely,
Alan “Bob” Mutchnick, PG, CEG 1789
Associate Engineering Geologist
Michael B. Moscrop, M.Sc., P.E., G.E. 2540
Vice President/Principal Geotechnical Engineer