HomeMy WebLinkAboutEngineer's Installation Observation Letter 04.23.24
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GLENWOOD SPRINGS 118 West Sixth St, Suite 200 | Glenwood Springs, CO 81601 | 970.945.1004
Page | 1
April 23, 2024
Mr. Ted White, Environmental Health Specialist III
Shania McCain
Garfield County Public Health
2014 Blake Avenue
Glenwood Springs, CO 81601
RE: Salmen OWTS
1506 Midland Avenue
Glenwood Springs, CO
Dear Ted and Shania,
The purpose of this letter is to follow up a site inspection performed last Thursday (4/18/24) on the Salmen
Residence OWTS at 1506 Midland Avenue, Glenwood Springs, Colorado. Based upon our observations, it appears
that the OWTS has been installed in general conformance with our report and drawings of August 8,2023. I have
attached the updated design drawings of 8/8/23 and calculations which reflect the tank and pump modifications.
Likewise, I have attached a general site plan prepared by Red House Architecture that accurately reflects the
revised location of the septic tank and dosing tank/pump.
Upon your receipt and review, if you have any questions, please don’t hesitate to contact me.
Respectfully,
SGM
Jefferey S. Simonson, PE
Principal
Client:Paul Salmen Project Location:1506 Midland Avenue
1504 Midland Avenue Glenwood Springs, CO
Glenwood Springs, Colorado 81601
Date:4-Aug-23
Flow Data for the OWTS Design
1 Home Use (4 Bedroom Home)525
Total=525
Home Use 525 gpd 0.48 #/day
Totals:525 gpd 0.48 #/day
Soil Data for the OWTS
2 Data from Kumar tactile soil analysis:Classified as a Sand, Loamy Sand
At a depth of 8', neither bedrock or groundwater are expected to be encountered.
Data from the web soil survey indicates an Ascalon-Pena complex exists.
Given the consideration of all data, the Long Term Acceptance Rate to use is 0.8 gallons/sf/day
for treatment level 1 (TL1)
For Treatment Level 3 (TL3) use a loading rate of 0.80 gallons/sf/day
(in order to achieve TL3, install Advantex AX25RT - 3B)
OWTS Design Report and Calculations
For Home Use, 2 persons per bedroom and 75 gallons per day per person, BOD5 = 0.06
#/person/day for up to 3 bedrooms and 1 person per bedroom there after
Septic Tank Sizing
3 Flow calculated from above:525 gpd
48 hour detention time for septic tank sizing;Volume= 1050 gpd
Install a 1250 gallon tank.
Sizing of Absorption Field or Soil Treatment Area
5 Going with a soil type R-0 and Treatment Level 1, LTAR = 0.8 g/sf/d
For a pressure dosed system, size adjustment factor is 1.0 for a bed configuration
For a gravity system, the size adjustment factor shall be 1.2 for a bed configuration
For a gravity trench system, adjustment factor = 1.0
For a pressure dosed trench system, adjustment factor = 0.8
For use of chambers: size adustment factor is 0.7
STA= Flow/LTAR 656 square feet (unfactored)
For a chamber system, adjust size to 0.7*656= 459 square feet
For pressure dosed system, adjust size to 0.8*459=368 square feet
For a chamber system in a trench configuration, length=123 feet
(this would equate to 2 runs of 56 feet each)
With the effective length of a Quick4 chamber at 4', use 16 chambers per trench for two trenches
(total length of each trench is thus 64 feet long for chambers only, and 66.8 feet with end caps)
Soil Classification based on
Kumar gradation
NO
NO
NO
YES
YES
62
Final design: Go with standard pressure distribution
system using Infiltrators and 36" of sand. No Advantex
Treatment Unit required. Use adjustment factor of 0.8
for pressure distribution and 0.7 for using chambers
and loading rate will be 0.8 gallons/sf/day for both
insitsu soils and secondary sand media
Graphic Scale
In Feet: 1" = 10'
0 5 10 20
Title:
OWTS Plan
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Job No.
Drawn by:
Date:
File:
PE:QC:
############
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2/07/2023
JS
OWTS REVISED
##
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FOUND #5 REBAR WITH
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LS #16842
10' WITNESS CORNER
FOUND #5 REBAR WITH
1.5" ALLOY CAP
LS #10732
10.97' WITNESS CORNER
FOUND #5 REBAR WITH
1.25" YELLOW PLASTIC CAP
LS #16842
SITE BENCHMARK
ELV: 5,790.80'
SET #5 REBAR WITH
2" ALLOY CAP
LS #23875
15' WITNESS CORNER
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LOT 1
PARCEL ID:
2185-162-04-001
1504 MIDLAND AVE.
AREA = ±
27,452 SQ. FT.
.630 AC.
LOT 2
PARCEL ID:
2185-162-00-016
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18" CMP
INV. OUT = 5787.98'
18" CMP
INV. OUT = 5788.88'
15' OVERHEAD ELECTRIC
& TELEPHONE EASEMENT
20' COMMON ACCESS
EASEMENT LOTS 1 & 2
TYPICAL AND ORDINARY
HIGH WATER LINE
(SEE LEGEND)
35' SETBACK FROM TOHWL
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EASEMENT
15' SEWER
EASEMENT
48" CMP
INV. IN = 5774.74'
48" CMP
INV. OUT = 5772.34'
OUTFLOW IS COVERED
IN 6 TO 8 INCHES OF SILT
LINE OF 100 YEAR FLOOD
PER FEMA PANEL
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1.DATE OF FIELD SURVEY: DECEMBER 13 & 16, 2019.
2.ALL BEARINGS ARE GRID BEARINGS OF THE COLORADO STATE PLANE COORDINATE SYSTEM, CENTRAL ZONE,
NORTH AMERICAN DATUM 1983. THE REFERENCE BEARING BETWEEN "A" (A FOUND #5 REBAR WITH 1.5" ALLOY
CAP) AND "B" (A FOUND #5 REBAR WITH 1.25" YELLOW PLASTIC CAP) IS N87°22'41"E AS SHOWN HEREON. ALL
DISTANCES ARE GROUND DISTANCES BASED ON A COMBINED SCALE FACTOR.
3.THIS SURVEY DOES NOT CONSTITUTE A TITLE SEARCH BY THIS SURVEYOR OF THE BOUNDARY SHOWN AND
DESCRIBED HEREON TO DETERMINE:
A) OWNERSHIP OF THE TRACT OF LAND
B) COMPATIBILITY OF THIS DESCRIPTION WITH THOSE OF ADJOINERS
C) RIGHTS-OF-WAY, EASEMENTS AND ENCUMBRANCES OF RECORD AFFECTING THIS PARCEL.
4.DUE TO INSUFFICIENT PHYSICAL EVIDENCE OF SURVEY MONUMENTATION CONTROLLING THE BOUNDARY
LOCATIONS OF THE SUBJECT PARCEL OF LAND, A GRANT BOUNDARY ADJUSTMENT WAS UTILIZED CONFORMING
TO THE EXISTING RECOVERED AND VALIDATED SURVEY MONUMENTS SHOWN HEREON AND PRESERVING THE
GEOMETRY OF THE ORIGINAL LOTTED PARCEL.
5.THIS SURVEY WAS PREPARED WITHOUT THE BENEFIT OF A CURRENT TITLE INSURANCE COMMITMENT. TITLE
INFORMATION REFERENCED HEREON IS THE RESULT OF RESEARCH BY THIS SURVEYOR AND IS NOT
NECESSARILY COMPLETE OR CONCLUSIVE.
6.THE CLIENT DID NOT REQUEST ANY ADDITIONAL EASEMENTS, RIGHTS-OF-WAY AND/OR IMPROVEMENTS BE
RESEARCHED OR SHOWN ON THIS PLAT.
7.ALL DIMENSIONS AND COURSES ARE AS MEASURED IN THE FIELD UNLESS DENOTED IN PARENTHESES, WHICH
DENOTE THE BOUNDARIES OF RECORD ON THE ORIGINAL PLAT OF SESIA GRAHAM SUBDIVISION IN THE PUBLIC
RECORDS OF GARFIELD COUNTY, STATE OF COLORADO.
8.ELEVATIONS SHOWN HEREON ARE BASED ON GPS OBSERVATIONS UTILIZING THE CONTINUOUS OPERATING
REFERENCE STATIONS (CORS) THROUGH THE MESA COUNTY RTVRN NETWORK BROAD CASTING NORTH
AMERICAN VERTICAL DATUM (NAVD88).
9.CONTOUR INTERVAL EQUALS 1 FOOT.
10.ANY PERSON WHO KNOWINGLY REMOVES, ALTERS OR DEFACES ANY PUBLIC LAND SURVEY MONUMENT OR
LAND BOUNDARY MONUMENT OR ACCESSORY COMMITS A CLASS TWO (2) MISDEMEANOR PURSUANT TO
SECTION 18-4-508 OF THE COLORADO REVISED STATUTES.
11.NOTICE: ACCORDING TO COLORADO LAW YOU MUST COMMENCE ANY LEGAL ACTION BASED ON ANY DEFECT IN
THIS SURVEY WITHIN THREE YEARS AFTER YOU FIRST DISCOVER SUCH DEFECT. IN NO EVENT, MAY ANY ACTION
BASED ON ANY DEFECT IN THIS SURVEY BE COMMENCED MORE THAN TEN YEARS FROM THE DATE OF
CERTIFICATION SHOWN HEREON.
12.NOTICE: THIS PLAT AND THE INFORMATION SHOWN HEREON MAY NOT BE USED FOR ANY ADDITIONAL OR
EXTENDED PURPOSE BEYOND THAT FOR WHICH IT WAS INTENDED AND MAY NOT BE USED BY ANY PARTIES
OTHER THAN THOSE TO WHICH IT IS CERTIFIED. THIS DOCUMENT AND THE WORK IT REPRESENTS IS THE
BOUNDARY OF HIGH COUNTRY ENGINEERING, INC. NO PART OF THIS DOCUMENT MAY BE STORED,
REPRODUCED, DISTRIBUTED OR USED TO PREPARE DERIVATIVE PRODUCTS WITHOUT PRIOR WRITTEN
PERMISSION. AN ORIGINAL SEAL AND ORIGINAL SIGNATURE IS REQUIRED TO VALIDATE THIS DOCUMENT AND IS
EXCLUSIVE TO HIGH COUNTRY ENGINEERING, INC. AND THE OWNER(S) OF RECORD AS OF THIS DATE, OF THE
BOUNDARY DELINEATED HEREON AND THE SUBJECT OF THE SURVEY. THIS PLAT IS RESTRICTED TO THE
INTENT OF TITLE 38, ARTICLE 50, §101, 5 (a) AND (b) C.R.S.
,03529(0(176859(<3/$7A TRACT OF LAND BEING IN LOT 1 OF THE SESIA GRAHAM SUBDIVISIONSECTION 16, TOWNSHIP 6 SOUTH, RANGE 89 WEST OF THE 6TH P.M.CITY OF GLENWOOD SPRINGS, COUNTY OF GARFIELD, STATE OF COLORADOFOUND #5 REBAR WITH1.25" YELLOW PLASTIC CAPLS #15710
NUMBER TYPE DIA. (IN)DRIP RADIUS
(FT)
1 Oak 8 18
2 Oak 8 18
3 Oak 8 20
4 Oak 8 20
5 Oak 8 17
6 Oak 8 16
7 Oak 8 16
8 Oak 9 16
9 Oak 9 16
10 Oak 11 18
11 Oak 10 18
12 Oak 8 18
13 Oak 10 18
14 Cedar 10 12
15 Douglas Fir 18 15
16 Oak 8 14
17 Oak 8 18
REFERENCE BEARING
A
B
/(*$/'(6&5,37,21
LOT 1 OF THE SESIA GRAHAM SUBDIVISION
RECEPTION #378298, GARFIELD COUNTY, COLORADO
SITELOCATION
/(*(1'
6859(<25
6&(57,),&$7,21
I, BILL W.A. BAKER, A LICENSED PROFESSIONAL LAND SURVEYOR IN THE STATE OF COLORADO (#23875) DO BY
THESE PRESENTS CERTIFY THAT THE DRAWING SHOWN HEREON, WITH NOTES ATTACHED HERETO AND MADE A
PART HEREOF, REPRESENTS A MONUMENTED LAND SURVEY MADE UNDER MY DIRECT SUPERVISION AND THAT TO
THE BEST OF MY KNOWLEDGE, INFORMATION AND BELIEF, AN ACCURATE DEPICTION OF SAID SURVEY IS RENDERED
BY THIS PLAT. THIS SURVEY WAS CONDUCTED IN ACCORDANCE WITH APPLICABLE STANDARDS OF PRACTICE, IS
NOT A GUARANTY OR WARRANTY, EITHER EXPRESSED OR IMPLIED. THIS SURVEY PLAT COMPLIES WITH TITLE
38-51-102, COLORADO REVISED STATUTES.
BILL W.A. BAKER, COLORADO PROFESSIONAL LAND SURVEYOR #23875
CERTIFIED FEDERAL SURVEYOR #1699
/$1'6859(<3/$7'(326,7
THIS LAND SURVEY PLAT HAS BEEN ACCEPTED FOR DEPOSIT IN THE OFFICE OF THE CLERK AND RECORDER OF
GARFIELD COUNTY, COLORADO THIS ____ DAY OF __________, 2020, PLAT BOOK _____, PAGE ______, AS RECEPTION
NO.________________.
TITLE 38, ARTICLE 50, SUBSECTION 101 C.R.S.
(5) (A) PLATS SHALL BE DEPOSITED IN ACCORDANCE WITH THIS SECTION FOR THE SOLE PURPOSE OF RECORDING
INFORMATION ON SURVEYING MONUMENTATION IN ORDER TO PROVIDE SURVEY DATA FOR SUBSEQUENT LAND
SURVEYS AND SHALL NOT BE CONSTRUED TO AFFECT, IN ANY MANNER WHATSOEVER, THE DESCRIPTION OF A
SUBDIVISION, LINE, OR CORNER CONTAINED IN THE OFFICIAL PLATS AND FIELD NOTES FILED AND OF RECORD OR
TO SUBDIVIDE LOT.
(B) NO PLAT DEPOSITED IN ACCORDANCE WITH THIS SECTION SHALL CONSTITUTE NOTICE PURSUANT TO SECTION
38-35-109.
______________________________________
COUNTY SURVEYOR
SET BOUNDARY/LOT CORNER - AS DESCRIBED
FOUND BOUNDARY/LOT CORNER - AS DESCRIBED
TELEPHONE PEDESTAL
CATV PEDESTAL
ELECTRICAL TRANSFORMERE
ELECTRICAL METERE
CURB INLET
CONIFEROUS TREE
DECIDUOUS TREE
EASEMENT LINE (COLOR VARIES)
BUILDING SETBACK LINE
BOUNDARY OR LOT LINE
ADJOINER LINE
TYPICAL & ORDINARY HIGH WATER LINE
FLOW LINE
MAJOR CONTOUR LINE
MINOR CONTOUR LINE
8020
75((&+$57
CATCH BASIN
ASPHALT
CONCRETE
STONE RETAINING WALL
5' SETBACK
5' SETBACK
30' SETBACK
COPYRIGHT RED HOUSE ARCHITECTURE
date: remarks:
815 BLAKE AVE.
GLENWOOD SPRINGS,
CO. 81601
PHONE (970) 945-8240
FAX (866) 431-1950
bruce@redhousearchitecture.com
design + build
2 STORY RESIDENCE
UPPER FFE = 5777.50
LOWER FFE = 5765.00
LOT 1
PARCEL ID:
2185-162-04-001
1504 MIDLAND AVE.
AREA = ±
27,452 SQ. FT.
.630 AC.
SHOP
FFE = 5777.00
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0980 A1.1
COPYRIGHT RED HOUSE ARCHITECTURE
date: remarks:
815 BLAKE AVE.
GLENWOOD SPRINGS,
CO. 81601
PHONE (970) 945-8240
FAX (866) 431-1950
bruce@redhousearchitecture.com
design + build
Date:
Apr 23, 2024
Time: 12:58:49 PM
File name: 0980 A11 (24).vwx
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0980 A1.1
COPYRIGHT RED HOUSE ARCHITECTURE
date: remarks:
815 BLAKE AVE.
GLENWOOD SPRINGS,
CO. 81601
PHONE (970) 945-8240
FAX (866) 431-1950
bruce@redhousearchitecture.com
design + build
Date:
Apr 23, 2024
Time: 12:58:49 PM
File name: 0980 A11 (24).vwx
SITE PLAN
A1.1
S I T E P L A N
@ 1 "= 2 0 '-0 "