HomeMy WebLinkAbout3.0 Conditions of Approval6 SC HMU ES ER I GO RDO N I M EYER
ENG I NEERS & SURVEYORS
October 30 , 2000
Mr. Gary Aho
1588 Odin Drive
Silt, Colorado 81652
RE : Dust-N-Sage Kennel
Cistern Design
Dear Gary,
GLENWOOD SPRINGS
I 18 W. 6TH, SUITE 200
G L ENWOOD SPR INGS , CO 8 I 60 I
970-945-I 004
FX : 970-945-5948
ASPEN
P .O. BOX 2 I 55
ASPEN, C O 8 I 6 I 2
970-92 5-6727
F X : 970-925-4 I 5 7
At your request, and in order to meet a condition of approval for the Dust-N-Sage Kennel Special
Use Permit, we are providing this letter to address the water system design for the kennel as it
relates to water quantity and quality .
In your application for the special use permit as well as for the supplemental information provided
to the county, you note that the water demand for the kennel use is anti cipated to be 10-20
gallons per day. Additionally, subsequent conversations with you ha ve revealed that the system
will be supplied by hauling water from local municipal sources where it is common place to sell
potable water to individual users such as yourself. I understand that the hauled water will be
stored in a 1000-gallon con crete storage vessel for use via a pumped delivery system for the
kennel.
Since imposing this condition for approval of the spe cial use permit , I ha ve had a phone
conversation with Jeff Laurien , Senior Planner for the County Planning and Building Department.
Mr. Laurien re-iterated that the county co mmissioners were concerned about the adequacy of th e
design based upon the 20 gallon per day demand both from a quantity and quality standpoint. Of
specific concern , I presume , is the large volume to demand ratio created by the use of the 1000-
gallon storage vessel and the potential for the production of stagnant water. Therefore, I would
like to take the remainder of this letter to address the County's concerns regarding water quantity
and quality.
WATER QUANTITY
Given the 1000-gallon concrete c istern and the 20 gallon per day demand , the cistern volume has
the capa c ity to provid e 50 days of average demand to the kennel and 12 to 13 days of continuous
ma x imum day demands. Obviously, this represents a large volume and requires less need for
frequent water hauling .
If one were to "design " a syste m for the demands under "industry standards", a smaller storage
volume would be required . For example, required storage typically considers the storage volume
to be a combination of ma ximum day demands, emergen cy storage (equal to ma ximum day
demands) and fire storage (when required). In your case, the max imum day demand , assuming
an average day demand is 20 gallons per day , is 80 gallons per day. The emergency storage
component is equal to the ma ximum day demand (80 gallons per day) as well. As your facility is
lo cated in an existing subdi vision supp orted by fire flo ws (and storage) deemed adequate by the
Burning Mountain Fire Protection District, no fire storage is required for you r fa cility. Therefore ,
the storage requirement at any point in time would be 160 gallons . Under average day demands,
this would require you to haul water at a rate of every 3 to 4 days .
Gi ven the previously mentioned "design volume ", we would re commend your schedule for hauling
water cons ider a time period of every 10 to 20 days . This should accomm odate avoidance of
6 inclement weather for hauling water and should accommodate adequate storage for other factors
such as kennel population, wash down's and other un-foreseen water demand occurrences. With
this recommended schedule and average day demands, you should anticipate the need to haul
anywhere from 200 to 400 gallons . This would repre se nt, assuming a 200-gallon tank is used , 1
to 2 trips every 10 to 20 days.
Initially, we would recommend that you only provide 500 to 600 gallons of water in the cistern to
establish the exact water use for the facility. This would provide the "required storage" plus the
anticipated average day demand storage for the subsequent 10 to 20 day hauling cycle . By
closely monitoring water use in the facility, the excess volume available will provide you an
"equalization component" of storage in the cistern to accommodate a "regular hauling schedule ''.
In summary, we anticipate that the 1000-gallon cistern will provide more than adequate storage
for the facility .
WATER QUALITY
Given the 1000-gallon concrete cistern, water quality is of obvious concern. The major concerns
are that of the water becoming stagnant and the potential growth of bacteria due to the potential
high volume to demand ratio . The fact that your source of water is that of municipally treated
potable water works in favor of maintaining water quality for the kennel. Your most likely source
of water, I understand, will be from the Town of Silt. In fact, the Town's dispensing facility is close
to their water treatment facility where the chlorine residual in the water is relatively high .
Being a producer of potable water for municipal use, the Town is required to supply water with a
chlorine residual at a rate that the residual will be maintained to trace levels at the most remote
points in their distribution system . In fact, the State requires that the chlorine residual shall not be
less than 2.0 mg/I at the immediate distal end of the water treatment plant. Being a surface water
treatment plant , the Town of Silt is most likely maintaining 5.0 mg/I at the immediate distal end of
their plant. Using the dispensing facility close to their water treatment facility will assure a so urce
of adequately c hlorinated water with a high level of chlorine residual.
In regards to water quality, we would recommend that the volume considerations outlined in the
previous sections be followed . This would include not initially filling the cistern full, but half full .
Also, th e hauling cycle of 10 to 20 days be followed and adjusted according to actual use, which
is closely monitored. Assure that you use dispensing points in the municipal systems that are
closest to the town 's water treatment plant. Finally , coordinate with Grand Junction Laborat ories
to obta in chlorine residual test strips to allow you to continually monitor the presence of chlorine
in the cistern . In the case that the chlorine residual becomes immeasurable, provide ch lorine
tabl ets in the cistern to re -establish the chlorine residual to safe levels. Coordinate this pro ced ure
with Grand Junction Laboratories or Schmueser Gordon Meyer, Inc.
Hopefully, this letter respond s to the condition of approval for Garfield County. Upon your receipt
and review, if you have any questions , please don 't he sita te to contact me.
Resp ectfully Sub mitted :
D:\work 'worddocs\october 30.doc
(970 ) 94 5-1004
SGM
ENGINEERS
SURVEYORS
11..et:S
RECEIV ED AUG 3 1 2000
FAX (9 70) 945 -5948
SCHMUESER ~~~~
GORDON MEYER
118 West 6th , Suite 200
Gle nwood Spri ngs , CO 81601
August 31 , 2000
Mr. Gary Aho
1588 Odin Drive
Silt, Colorado 81652
RE: Dust-N-Sage Kennel
Individual Sewage Disposal System Design
Dear Gary,
Per your request, SGM has evaluated the design of the proposed septic system to service the
effluent from the proposed Dust-N -Sage Kennel to be located at 1588 Odin Drive, Silt, Colorado.
This work is in response to the request made by the Garfield County Building and Planning
Department during their review of your application of a special use permit for the aforementioned
use.
With this letter, you will find a number of attachments of wh ich are described as follows :
1. A photocopy of the Asgard Subdivision Plat, 3rd Filing , wherein the graphical
description of your lot, Lot #37 is identified. Excepting a 30 foot drainage
easement, no further easements are noted relative to the placement of the septic
system on the 5.6593 acre parcel.
2. A photocopy of the Aho property identifying the existing improvements as well as
the proposed optional sites for the proposed Kennel Bu ilding .
3. A photocopy of the Aho propoerty identifying the locations of the soil profi le holes
and percolation holes .
4. A photocopy of the plans and elevat ions of the proposed building for the Dust-N -
Sage Kennels .
5. A photocopy of the percolation test data compiled from the percolation/so ils
testing performed on August 27, 2000.
6 . Design calculations for the individual sewage disposal system for the kennel.
7 . Table of setbacks for installation of individual sewage disposal system
components .
8 . Detail of a "Standard Infiltrator Chamber''.
9 . Manufacturer's literature for the installation of the disposal field using infiltrator
units.
10. Code information for the proper installation of the other various components of
the septic system .
Page 2
DESIGN FLOW DISCUSSION
For the proper design of the individual sewage disposal system, it is necessary to determine the
anticipated design flows intended to utilize the system on a daily basis. Based upon our
discussions, it appears that the special use permit has considered the population of the kennel to
potentially house twenty (20) dogs. Our review of the building construction plans indicates that
the kennel will actually provide individual kennel packages (ie., wire cages) for one-half of that
population, or ten (10) dogs. However, from the county review standpoint, since the application is
for up to 20 dogs, we will address the "worst case" scenario which considers the 20 dogs. If,
during further planning, and upon the submittal of a "septic permit" concurrently with the building
permit it is determined that the system will only need to accommodate ten (10) dogs, then the
system can accordingly be down sized.
Because this system will be an additional system housed on the 5.6593 acre parcel, the county is
concerned with the combined flow for the lot not serving over 2000 gallons per day, average daily
flow. Therefore the entire flow for the site is also calculated.
For the kennel itself please note the following:
1. Design for 20 dog population.
2. From Table I, "Quantities and BOD Strength of Sewage for Various Types of Uses' of the
1994 Edition of the "Individual Sewage Disposal Systems" design guidelines of the Colorado
Department of Health, Water Quality Control Division, the average daily flow, per dog, for
kennels is thirty (30) gallons per day.
3. Average Daily Flow for Dust-N-Sage kennel is:
20 dogs X 30 gallons per day per dog = 600 gallons per day (gpd)
For the existing home (three (3) bedroom home), please note the following:
1. Three bedrooms in home.
2. Two persons per bedroom.
3. Seventy five (75) gallons per day per person.
3 bedrooms X 2 persons per bedroom X 7 5 gallons per person per day = 450 gallons per
day (gpd)
Total flow for the site is:
Kennel: 600 gpd
Home: 450 gpd
Total: 1050 gpd
Note that since the total flow from the site is less than 2000 gallons per day, the county will be able
to process the permitting for the individual sewage disposal system.
~---------------SCHMUESER GORDON MEYER, INC·----------------'
Page 3
PERCOLATION TESTING
The soil profile hole excavated for the site did not encounter the presence of either bedrock nor
ground water in existence within 8 feet of the surface. Additionally, the percolation testing
indicated a "worst case" percolation rate of 40.33 minutes per inch.
Given the observations of the soil profile hole as well as the results of the percolation tests, a
standard ISDS design can be performed using the guidelines outlined in the county's ISDS
regulations.
COMPONENT SIZING
The septic tank size for the 600 gpd average daily flow will need to have a nominal capacity of
1, 125 gallons considering the 1.5 peaking factor to derive the design flow and the 30 hour required
detention time.
The absorption area tor the disposal field will need to be 1, 143.11 square feet considering the
design flow (average daily flow times 1.5) and the 40.33 minute per inch percolation rate.
As was previously mentioned, we have attached the manufacturer literature for the utilization of
infiltrator chambers for the disposal field construction. Please note that if this product is used, the
State Health Department as well as Garfield County recognizes a reduction of absorption area
requirement by 30% for use of the infiltrators in a "bed configuration" and 50% for use of the
infiltrators in a "trench configuration". Typically, site and setback constraints determine the most
feasible configuration for the disposal field construction. However, it appears that neither of these
constraints are applicable and that the configuration can be economically selected by yourself or
your contractor.
SUMMARY
Based upon the information attached, it appears that the provision of Iha septic system on this site
is feasible for even the worst case scenario when considering dog population. Flexibility in
selecting the type of disposal field is also available. Please note that as you further decide upon
final dog population for design and absorption field construction, we can be of further assistance to
prepare specific plans for construction. However, an experienced installer of septic systems within
Garfield County, whom is also knowledgeable with the county's ISDS regulations will be able to
properly provide the construction of the system without further information. Assistance will also be
given to you from the county's inspector upon submittal of an application for a "septic system
permit' as well as through inspections during construction of the system itself.
I appreciate you having given SGM the opportunity to be of service to you in this matter. If you
have any questions or need further assistance, please don't hesitate to call.
~---------------SCHMUESER GORDON MEYER, INC·---------------~