HomeMy WebLinkAboutEngineer Report for OWTS - 06.19.2017IIIOUNT¡¡ilN CROSS
ENGINEERING, INC.
Clvll and Envlronmentel Consultlng and Deslgn
Iune 19,2017
Red Bam Guest Ranch
C/O Mr. Larry Halonen
26432 El Mar Drive
Mission Viejo, CA9269l
RE: Red Barn Guest Ranch, 345 Mid Valley Lane, Newcastle, CO - OWTS Report
Dear Larry:
The purpose of this correspondence is to inform you about the onsite wastewatertreatment system
(OWTS) designed for the Red Barn Guest Ranch. The project proposes to construct a reception
center for events serving up to 300 people. The project is located in Peach Valley, to the east of
Silt and to the west of New Castle, at345 Mid Valley Lane. This will be a gravþ system from
the events center to a conventional septic tank where a siphon doses to a leach field comprised of
infiltration chambers. The event center will be served by well water. The OWTS is not within the
100-year flood plain boundary. There are practical constraints that you should be aware of when
considering the proper design, construction, and operation of the OWTS.
Subsurface
The LTAR value was approximated as 0.60 gallons per day per square foot (GPD/sq.ft.) from soil
evaluations as a sandy loam, silt loam and also from percolation test results performed by this
office on June 14,2017. These percolation tests results yield a value of 24.7 minutes per inch. An
8' deep profile hole was excavated and an inspection revealed that no bedrock or high groundwater
table is within the leaching area.
Desisn Calculations
The water use is based on a flow rate of 5 gallons per person per day. Using Garfield County
Table 6-2, this equates 1,500 gallons per day (GPD) total. The design calculations for sizing of
the septic system and the leach fïeld follow:
o Red Barn Guest Ranch: 300 Person Capacity t 5 GPD per person = 1,500 GPD
o Based on soil evaluation and percolation tests results, LTAR = 0.60
¡ Minimum absorption area = 1,500 GPD / 0.60:2,500 sq. ft.
o Reduction in soil treatment areas for chamber/trench treatment with dosing
:2,500 sq. ft. * 0.7 t 0.9 : 1,575 sq'ft leach area
¡ Required chambers: (1,575 sq,fty(123a sq.ff/chamber)
= 127.6 chambers, Use seven rows of l9 chambers, 133 chambers
. Required septic tank volume = 2,000 gallons per Garfield County Table 9-l
826/"Grand Avenue, Glenwood Springs, CO 8'l60l
P: 970.945.55 44 F t 97O.945.5558 www.mountaincross-€ng.com
Red BamGuest Ranch
June, 2017
Page 3 of3
being discharged to OWTS; for example, running toilets or leaky faucets can discharge hundreds
of gallons of water a day and harm the absorption area.
Garbage disposal use should be minimized, and non-biodegradable materials should not be placed
into the OWTS. Grease should not be placed in drains and grease traps should be installed
upstream of the septic tank but downstream from any kitchen. Loading from a water softener
should not be discharged into the OWTS. No hazardous wastes should be directed into the OWTS.
The OWTS is engineered for domestic waste only.
The Owner will likely need to contract with a septic system cleaner to clean the septic tank every
two years, or as needed gauged by measurement of solids in the tank. The standards of
performance for the septic system cleaner are recommended to be the following, at a minimum:
1. The Systems Cleaner shall be licensed.
2. The Systems Cleaner, when cleaning a septic tank, shall remove the liquid, sludge, and
scumo leaving no more than three (3) inches depth of sewage in a septic tank.
3. The Systems Cleaner shall maintain his equipment so as to ensure that no spillage of
sewage will ocour during transportation, and that its employees are not subject to undue
health hazards.
4. The Systems Cleaner shall dispose of the collected se\¡/age only at a designated site
recognized by the Board of Health.
Construction 0bservation
Prior to being backfîlled, the construction of the OWTS and all of the components will need to be
observed by representatives of Mountain Cross Engineering, Inc.
Ths conclusions and opinions that are expressed above are based on the information available at
the time of preparation ofthis report. Any additional information presented afterward may require
that these opinions and the design be modified'
Thank you for the opportunity to provide this report. Feel free to call if you have any questions,
concerns, or comments.
Sincerely,
Mountaín Cross Engineering, Inc.
Chris Hale, PE
Mountain Gross Enoineerino. lnc.
Clvll and Envlronmcntal Goneultlng and Design
8261"G¡and Avenue, Glenwood Springs, CO 81601
P: 970.945.55 44 F : 970.945.5558 www.mountaincross-eng.com
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