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COUNTY OF GRAND

SEWAGE DISPOSAL SYSTEM PERMIT NUMBER 899- 0152

AGREEMENT:

In consideration of the issuance of this permit, the undersigned hereby agrees to comply withall such laws and regulations in the location and construction of the proposed system forwhich this permit is granted, and further agrees that if the above said ordinances are not fullycomplied with in the location, and construction of the above described system the permit maythen be revoked by notice from the Grand County Department of Building and Sanitationand THEN AND THERE IT SHALL BECOME NULL AL'\1D VOID.

THIS PERMIT IS NOT TRANSFERABLE

Date 9/ 28/ 99

Permit is hereby issued to (construct) ( alter) ( repair) For A Two Bedroom Structure

Home Waste Water Disposal System

erLindsay Wert Address 2613 S. Krameria, Littleton, CO 80222

InstallerAbramoff Address ~ n~ 202, CraRby, CO 0044G

Address of proposed system (legal description) P:arC'", 1 ' 2. Linke l?arce 1 fIiUnit B

Distance of treatment tank from well 50 min from property line 10 I min

0\1- D;stance of absorbtion system from well 100' min from property Hne 10 . ~

APPROVED OJ!.. q' 3o'<'f~ ~Grand County Department of Building and SanitationThis permit will be signed if final inspection is approved,

ALL ITEMS LISTED BELOW MUST BE INSPECTED AND APPROVED BEFORE COVERING:

Size of effluent pipe: 4" min

o~ Size of treatment tank (two-compartment): 1000 gal min

Size of dosing tank (if applicable): NA

Ie- Size of effluent disposal area: G~P 5H'

Depth of class " A" rock: NA

Percolation rat.e average: 53 min/ in

Type of sub-soil: Sandy clay, granite bedrock at 6 I

Water table depth: Below 8 I

fJt., Type of system: Standard soil absorbtion system with 44 infiltrators

NOTE: Hard copy of permit must be posted at site or STOP WORK ORDER will be issued,

APPLICA TION FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMff

Name ofOwner: tv ,--..rye { Phone:

ofOwner (Permanent 'J,-: I' b

Residence) C>t'({) 5 v<. K/t1I1LS/ C I /1 ./, TTZ6-7l:J-0 re> 902'2'2...

legal Description of Proposed Site I'l}eCt: Z fJ - ~/ 1JkIF' //he~~ - t/,'J I T BSewage System InstaIler's Name .f), !fd'I(ITf'Ju' iff,c Phone_Ci?cl)& f) -ole, s- S-

Installer Address fh.x cla2 ~ tt" ft1.Jg y Cg ~ y 'i ~

Zoning e: Type ofConstruction rJW 5 Size ofLot ~ J / 1C1ecS

Type ofWater Supply UEZL- Depth ofWell I CJ)

By <Aunty A.~ Iofis are coosidered bedrooms whether there is a closetorDOt. Otha- roomsdesignated as Kdens-, etc. will be considered bedrooms if theIe is a closet in them. Septic syatQus aresk:ed by the number of bedrooms. not bathrooms.

Number ofBedrooms ~Number ofLofts ( V

Number ofDeos,5tudies,Offices with closets aTotGl . 2-

Automatic Oothes Wasber~_ No Garbage Djsposal /Yes_ NoBasementPl~ YesLNo

Application for an individual sewage disposal system permit is hereby submitted together with allrequired plans, specifications, test resuIts, supplementary information and processing fee of $150.00.The individual sewage system will be constructed and instaUed in accordaoce- with regulationspertaining to individual sewage disposal systemS within Grand County. (Grand County Board ofHealthResolution Number 1978,(i..t or the most recent amend version.)

I (the owner) certify that the in/ormation cC1flt(Jined iR this appIicadon fOfffl is tnIe to the best of., 1cnowleJge.I ac1cnowlqe reaipt ofan infonnadon sheet. and ttdditional supplementary mtJUTi4ls with this application formand cenib thtu I htwe read and emderstand all infonJllJdon contained within such mtJUTi4ls. I do hereby agreeto compz., with all TegUiadons pertaining to indMdual sewage disposal s,stems as set forth in Grand emw,BoaTd ofHealth re.soludon Ntanber 1978-6..1 or the most recent <<rnentled version and all ColoraJo LawspettQining to sewage ~ andIO'r disposal

Owner Signature

Date

Date F0 J

e..,

500-.( 0.- ~ '

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6'<"'<;)d-~ Grand County Building Department

108 Byers Ave., Hot Sulpher Springs, Co 80451

970) 725-3347

Name

Date 9/9/99

Legal Desc.

53 Percolation T Value2 Number of Bedrooms1 Number Washing Machines1 Number of Garbage Disposals

Sewage Flow CalculationOB= 4 OB= # of Bedrooms X 2

GPD= 75 GPD=Gallon's per dayMF= 150% MF= Max flow0= 450.00 Gal's 0= MF X GPO X OB

Absorption CalculationA= 655.21 A=(O* SOR(T)) / 5

Absorption AreaWM= 0.4

GD= 0.2

AA= 1048,336 Sf.

OF Washing Machines X 0.4OF Garbage Disposals X 0.2

AA=(WM+WG+ 1 )* A

Tanking SizeTS= 562,50 Gal's TS=O*(30124)

Minimum Tank Volume

Absorption Area1000 Gallons

1048.34 Sf. l(, ltS:. (,i~ ~f 7'~.s'~", y l~-<:\ 11W"e.' ad

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Revised FinalSoil and Foundation Investigation and

Percolation TestingProposed Wert Single Family Residences

37 Acres in Orr Track,Grand County, Colorado

Prepared for:Mr. Lindsay Wert

2613 South Krameria StreetDenver, Colorado 80022

Attention: Mr. Lindsay Wert

Job Number: 98- 1052September 18, 1999

GROUNDENGINEERING CONSULTRNTS

PHONE ( 303) 289- 1989 FAX ( 303) 289- 1686 7393 Dahlia Street, Commerce City, CO 80022- 1834

TABLE OF CONTENTS

Page

Purpose and Scope of Study

Proposed Construction "....""., ,.., ,.,."".." ""..., ,.,....", ..., ,.."" ... ,.".., ,..""", ,...,.. .""", ,., ,...", '. .,.". .,.

Site Conditions ,.,..".. ,..., .,.". ,."".,..", ,."". ....,. ,."".. ." .,. ..,.."", ".,.",.."" ,..",. .." ,."" ,."",. ."." ..." ,.,..

Field Investigation .."......,..."....;,..,.......,............"......,....."........,.."..,..,..".."..".. ,..... ,..,....."....,.." 2

Laboratory Investigation ",..."......, ......"......... ,......., ,...............".........",.....",..,..,... ,... ,..,...,........,. 2

Subsurface Conditions ....,...... ,..,.........."....,......,. ........,.......,.......,..,.."... ,......,......."..., ,.... ,.. ,.. ...... 2

Foundation Recommendations ...,..,..."..., ........,..... .....,...,........ .....,..,..,...,...,..,.........,......."...,.... '" 3

Floor Slabs "..,.,.,....,..""..,...",..".." ,.. ..1'........."......".. ,..,.., _...,...............,.....,.... ,....,.., .......,........", 4

Water-Soluble Sulfates",..",..,..",..,......, ..,.....,..."...,.., .'.. ,.. ,....,..........".,...,..,...,....."....",...,......,....., 4

Surface Drainage, ,. '..,."", ,., ..."'..,,, .,..",..",.,."",.. ,., .., ".."",.." ,..., ,..",. ,.",'..".., ,.. ,., ,.., ,."..." ,. ,.", ,.., 5

Underdrain System ..,',....".,...,',....""..,..,......,.,.......,.........",.."....... ,.......,....,..".....,......,..,.,....,.. ,.. 5

Septic SystemRecommendations......................,.....,....",............,...,..,...".....,..,..,..,..,.......:...,....", 6

Maintenance ,........,......., ...,'..., ,...,.,",..""..".....,......."."...."..., ,...,',..".....,.....,.",..,...,.,.,..,....,......,.. 7

Limitations ...".".. .,., ,. ,.,.,.", ,....""....",.",.,.. "......,..."" ...".....,..., ,. ..,...."..,.;..."" :.,."...", ,..., ,.,. ,.",.,., 8

Locations of Test Holes . .,...."...".....,',...",..,....,.".,.........,.."...............,. ,...."..,...,...,....,....,., ,Figure 1

Logs of Test Holes ,.." ',.....,',...,.."..";....."...,..."...........,...,....."......,.....,..,..."..""...."...,..,,... F igure 2

Legend and Notes ..... .....,..."..,....,......"..,. ,..,...."....."..,',..."...,....,..,....,..""."......,....,...,..,.... Figure 3

Typical Concrete Septi~ Tank ,'.., ,......,..,',...."..,.........."..,.,....",....,...,.....,......,..,..,..,.." ,.., ,..Figure 4

Typical Conventional Cross Section ............ ~........................... ,.......................................... Figure 5

Two Bedroom Conventional Seepage Bed Plan ........,.....,................................,'"................. Figure 6

JThree Bedroom Conventional Seepage Bed Plan ............................................................,.., Figure 7

Summary of Soil Tests ',..,',..,..."..........,.....,....,..",...,...... ',.."....,...."....,...,..,..,......,.....,.."...... Table 1

Percolation Test ..,..,...,',.."..",......,.......,.....,....,..,....., ,....,.....,..., ....."......,...,.,.............,... Appendix A

Sewage Volume Calculations .....,..........".....,.,.....",. ,....,..,."......., ,:,....."..,...,.,...,..,..,.., ,Appendix B

Pipeline Article Specifications .."......,.."".......",..,....,.,...,....",......":.."..".,.,,,.,....,...,.., . Appendix C

Proposed Wert Single Family Residence

Grand County, Colorado

Purpose and Scope, of Study

This report presents the results of a soil and foundation investigation for the two proposedresidences to be located on 37 acres located in Orr Track near Granby in Grand County,Colorado, The project site is shown in Figure 1, In ,addition to the soil and foundation

investigation, percolation tests' were performed to develop recommendations for the individual

sewage disposal,syst~m for the each residence.

A field exploration program was conducted in order to obtain information regarding the

subsurface conditions. Material samples obtained during the subsurface investigation were

tested in the laboratory to provide data on the classification and engineering characteristics of the

onsite soils, The results of the field and laboratory investigations are presented herein,

This report has been prepared to summarize the data obtained and to present our conclusions and

recommendations based on the proposed construction and the subsurface conditions encountered,

Design parameters and a discussion of the geotechnical engineering considerations related to the

construction of the proposed residence are included.

Proposed Construction

The proposed construction at the site consists of separate three-bedroom and two-bedroom,

single family residences, each having an individual sewage disposal system, Based on the

information provided, we anticipate that structure loadings will be light, typical of residential

construction. The amount of site grading required for construction appears to be minimal given

the grade of the site,

If the project features or loadings differ significantly from those above, we should be contacted

to reevaluate the recommendations contained herein,

Site Conditions

The site is comprised of a topographic high located in the vicinity of the proposed single familyresidence, The proposed absorption field location is southeast of the proposed single familyresidence, and slopes down to the east, south east on the on the order of approximately 150, The

site is vegetated with natural alpine grasses and coniferous trees,

98- 1052 Ground Engineering Consultants, Inc. Page 1

Proposed Wert Single Family ResidenceGrand County, Colorado

Field Investi~ation

The field investigation for the project was conducted on October 26 and 27, 1998. Two profiletest pits Fl and F2 were excavated near the proposed residence area to evaluate the soil profilefor foundation recommendations. An additional profile test pit S 1 and three percolation test

holes were excavated to the east and down gradient of the proposed residences in the area of the

proposed absorption fields, Based on information provided by the client, the proposed

absorption areas are beyond a IOO- foot radius of any proposed or known domestic well location.

The soil profiles for the foundation and percolation profile holes were logged by a representativeof Ground Engineering Consultants, Inc,

Samples of the subsurface soils were obtained during the exploration process for laboratory

testing, Depths at which the samples were taken are shown on the logs of the exploratory soil

profile pits, Figure 2.

Laboratory Investigation

The samples obtained from the exploratory pits were examined and classified in the laboratory

by the project engineer, Laboratory testing included standard property tests such as natural

moisture contents, swell/consolidation, grain size analysis and liquid and plastic limits.

Laboratory tests are summariied in Table 1. The laboratory testing was conducted in general.accordance with ASTM specifications.

Subsurface Conditions

The subsurface soils encountered at the site were variable.

The subsurface conditions encountered in test holes Fl and, F2 generally consisted of topsoil

overlying clay, which was underlain by granitic bedrock at depth. The topsoil was brown and.

humic to a depth of 6 inches" Clay was encountered from 6 inches to a depth of 6 feet below

existing grade, and w~s sandy with occasional gravels and cobbles, medium plastic, stiff to

dense, slightly moist to moist, and brown in color, Granitic bedrock was encountered from 6 feet

to the total explored depth of 8 feet below existing grade and was weathered to hard, slightlymoist, and brown in color

The subsurface conditions encountered in test hole S 1 generally consisted of topsoil overlying

clay. The topsoil was brown and humic to a depth of 6 inches. Clay was encountered from 6

inches to depth of 6 feet below existing grade, and was sandy with occasional gravels and

98. 1052 Ground Engineering Consultants, Inc. Page 2


cobbles, medium plastic, stiff to dense, slightly moist to moist, and brown in color. Granitic

bedrock was encountered from 6,5 feet to a total explored depth of 8 feet below existing gradeand was weathered to hard, slightly moist, and brown in color.

Graphic logs of the test pits are shown in Figure 2, with associated legend and notes in Figure 3.

Groundwater was not encountered in the test pits at the time of our investigation,

Foundation Recommendations

Considering the conditions encountered on-site and the nature of the proposed construction, we

recommend that the proposed residences be founded on spread footings placed undisturbed

underlying bedrock,

The design and construction criteria presented below should be observed for a spread footingfoundation system, The construction details should be considered when preparing projectdocuments.

1) Footings placed on undisturbed underlying bedrock may be designed for a maxImum

allowable soil bearing pressure of 3,000 psf,

2) Spread footings placed on the natural granular, soils should have a minimum footingdimension of 14 inches.

3) Exterior footings shall be provided with adequate soil cover above their bearing elevation for

frost protection. Placement of footings at least 4 feet below exterior grade is considered

adequate soil cover in this area, It appears that the depth to bedrock will require the footingsto be placed approximately 6 feet below grade.

4)' The lateral resistance of spread footing foundations placed on undisturbed natural soils will

be developed as the sliding resistance of the footing on the foundation materials, Slidingfriction at the bottom of the footings of the footings can be taken as 0.4 times the vertical

dead load,

5) Continuous foundation walls should be reinforced top and bottom to span an unsupported

length of at least 10 feet.

98- 1052 Ground Engineering Consultants, Inc, Page 3



6) Based on experience, we estimate the total settlement for footings designed and constructed

as discussed in this section will be approximately 1 inch.

7) Care should be taken when excavating the foundations to avoid disturbing the supporting

materials, Excavation methods, which minimize soil and rock disturbance, should be

implemented, If excavations into the bedrock are required for tile footings, excavation may

be difficult. Disturbance of the founding materials should be minimized as much as possible,

8) A representative of the soil engineer should observe all footing excavations prior to concrete

placement.

Floor Slabs

The natural on-site soils, exclusive of topsoil, are suitable to support lightly to moderately loaded

slab-on-grade construction if placed at the proper moisture content and density. The floor slabs

should be placed on at least 3 feet of removed and replaced, properly compacted natural on-site

soils, exclusive of topsoil. The onsite-soils should be compacted to at least 98 percent of the

maximum standard Proctor density ( ASTM D-698) within 2 percent of the optimum moisture

content, The fill should then be placed in uniform lifts not exceeding 8 inches, Floor slabs

should be provided with control joints to reduce damage that may occur as a result of shrinkage

cracking, Additionally, the slabs should be adequately reinforced. We suggest the spacing be

provided on the order of 12 feet centers. The actual joint spacing should be based on the slab

reinforcing design.

A minimum 4 inch layer of free draini~g gravel should be placed beneath the floor slabs, This

material should consist of aggregate meeting the gradation criteria of No, 57 or No, 67 concrete

aggregate as defined by the Colorado Department of Transportation standard specifications. The

granular layer will help distribute floor slab loadings and aid in drainage,

Water-Soluble Sulfates

The concentration of water-soluble sulfates measured in the two samples obtained from the

exploratory pits returned a value less than 0. 1 %. This concentration of water-soluble sulfates

represents a negligible degree of sulfate attack in concrete exposed to these materials, The

degree of attack is based in a range of negligible, moderate, severe, and very severe as presented

in the " Design and Control Mixtures" presented by the Portland Cement Association,



Based on this information, we believe special sulfate resistant cement will not be required for

concrete exposed to the onsite materials,

Surface Drainage

The following drainage precautions should be observed during the construction and maintained

at all times after the r~sidences have been completed,

1) Excessive wetting or drying of the foundation excavations and underslab areas should be

avoided during construction,

2) Exterior bacJdill should be moistened and compacted to at least 95 percent of the maximum

standard proctor density,

3) The ground surface surrounding the exterior of the buildings should be sloped to drain away

from the foundation in all directions, We recommend a minimum slope of 6 inches in the

first 10 feet.

4) Roof downspouts and drains should discharge well beyond the limits of the backfill.

5) Landscaping which requires excessive watering should be located at least 10 feet from theI

house.

6) Plastic membranes should not be used to cover the ground surface adjacent to the foundation

walls.

Underdrain SystemI

The lower level of the structure should be protected by an underdrain system, Groundwater was

not encountered, but due to the quantity of snow melt and slope of the site, our experienceindicates that these conditions can result in the saturation of the surface soils for an extended

period of time,

An underdrain system should consist of an exterior perimeter drain line located outside the limits

of the foundation wall and below the bottom of the free draining gravel layer (below the slab) at

the high point. The drain line should then slope at a minimum grade of 1 percent to a daylight

98. 1052 Ground Engineering Consultants, Inc, Page 5



outlet or a sump. The line should be a 4-inch perforated PVC pipe with a fabric sleeve, such as

Mirafi 140N, The line should be surrounded on all sides by at least 6 inches of free draining

gravel. The gravel should contain less than 50 percent passing the No, 4 sieve and less than 3

percent passing the 200 sieve. The trench should be backfilled with gravel to within one foot of

the surface. The gravel in the trench should also be wrapped in a filter fabric such as Mirafi

140N or equivalent. The upper one foot of the trench backfill may consist of onsite soil.

Septic System Recommendations I Percolation Test Results

Percolation tests were performed in accordance with applicable county and state requirements in

the sandy to very sandy materials. The average percolation rate in these soils was found to be 53

minutes per inch, This percolation rate falls within the allowable range ( 5 minutes per inch to 60

minutes per inch) for conventional absorption fields, Percolation tests were conducted in

accordance with applicable county and state requirements. The percolation test data is shown in

Appendix A.

For the proposed 2-bedroom residence, we have calculated a peak flow for design of 720 gallons

per day, The sewage volume calculations are shown in Appendix A. The septic tank should

have a capacity of at least 1, 000 gallons per EPA and State Department of Health guidelines, A

typical septic tank cross section is shown in Figure 4. A conventional gravel absorption bed

system, as shown in Figures 5 and 6, shall cover a minimum area of 1, 049 square feet. A

chambered system such as the Infiltrator system may be used in lieu of a conventional gravel

absorption system, The chambered system should cover a minimum area of 682 square feet.

Installation should be in accordance with the manufacturer' s recommendations and the system

should consist of a minimum of 44 infiltrators for chambers measuring 15, 5 square feet per

chamber.

For the proposed 3- bedroom residence, we have calculated a peak flow for design of 1, 080

gallons per day, The sewage volume calculations are shown in Appendix A. The septic tank

should have a capacity of at least 1, 000 gallons per EPA and State Department of Health

guidelines. A typical septic tank cross section is shown in Figure 4. A conventional gravel

absorption bed system, as shown in Figures 7 and 8, shall cover a minimum area of 1, 573 square

feet. A chambered system such as the Infiltrator system may be used in lieu of a conventional

gravel absorption system, The chambered system should cover a minimum area of 1, 023 square

feet. Installation should be in accordance with the manufacturer' s recommendations and the

system should consist of a minimum of 66 infiltrators for chambers measuring 15.5 square feet

per chamber,

98- 1052 Ground Engineering CODSultants, Inc, Page 6



The minimum distance between the two absorption fields should be 10 feet, and the material

separating the two fields should be composed of native soils or properly recompacted onsite fill

materials,

We recommend that the specifications outlined in Appendix B be followed. The soils engineer

should be contacted to observe construction of the septic system and absorption fields as well as

to verify that the soils encountered coincide with those that were tested.

Maintenance

All septic systems must be maintained to operate properly, The homeowner shall take an active

role in maintaining their septic system, We have attached a copy of the National Small Flows

Clearing House publication entitled " Pipeline: Maintaining Your Septic System - A Guide For

Homeowners." The homeowner should become familiar with the information contained within

this important document,

98- 1052 Ground Engineering Consultanfs, Inc, Page 7


Limitations

This report has been prepared with generally accepted soil and foundation engineering practicesin this area for use by the client for design purposes. The conclusions and recommendations

presented in this reP9rt are based upon the data obtained from the exploratory holes excavated at

the locations indicated on the exploratory hole plan. The nature and extent of variations between

the exploratory holes may not become evident until excavation is performed. Locations of

physical features on the lot or surrounding lots that may have an impact on the septic system

design ( wells, etc,) were not surveyed or located as a part of this study. We recommend that the

owner have a survey performed, If during construction, soil, rock, and groundwater conditions

appear to be different from those described herein, this office should be advised at once so that

reevaluation of the recommendations may be made, We recommend onsite observations of

excavations and foundation bearing strata by a soil engineer.

Sincerely,

GROUND ENGINEERING CONSULTANTS, INC.

rryanK, Simpson

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BRaUNDENGIN EAING CDNSULTANTS

LOGS' OF TEST HOLES

JOB NO, 98- 1052 DRAWN BY: Y.K

FIGURE: 2 APPROVED BY: JK

CADFILE NAME: 1052LOG,DW'G

LEGEND:

E] Topsoil: Brown, humic.

rn Clay: Sandy with Qccasional gravels and cobbles, medium plastic, stiff to dense, slightlymoist to moist, brown.

Granitic Bedrock: Weathered to hard, slightly moist, brown.

P Drive sample, 2- inch LD. California liner sample

t ~ Small disturbed sample

NOTES:

1) Test pits were excavated pn 10/ 13/ 98 with rubber tire back hoe.

2) Locations of the test pits were measured approximately, by pacing from featuresshown on the site plan provided. .

Elevations of the test pits were ~ ot measured and the logs of the test pits aredrawn to depth. :

The test pit locations and elevations should be considered accurate only to thedegree implied by the method used,

3)

4)

5) The lines between materials shown on the test pit logs represent the approximateboundaries between material types and the transitions may be graduaL

Groundwa.ter wa.s not encountered during drilling. Groundwa.ter levels can fluctuateseasonally and in response to landscape irrigation.

8)

BRaUNDENBINEEAINB CDNSLLTANTS

LEGEND AND NOTES

JOB NO. 98- 1052

FIGURE: 3

DRAWN BY: YK

APPROVED BY: JK

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CONVENTIONAL TWO BEDROOMSEEPAGE BED PLAN

JOB NO. 98- 1052

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DRAWN BY: HN

APPROVED BY: IN

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BRaUND .'EN& I" EEFlIN& CDNSULTANTS

CONVEN110NAL THREE BEDROOMSEEPAGE BED PLAN

JOB NO. 99- 1052

FIGURE: 7

DRAWN BY: HN

APPROVED BY: IN

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APPENDIX A

Percolation Test Results

Job Number: 98- 1052

Date: 10/26/98

Tested By: MR

Hole Number Hole Depth Length of Water Depth Water Depth Drop in A ~erage

Interval at Start of at End of Water Percolation

Interval Interval Level Rate

inches) ( minutes) ( inches) ( inches) ( inches) ( min/in)

P- l 10,0 10 2 2.5 0,5 20

10 2.5 3 0,5 20

10 3 3, 375 0.375 27

10 3, 375 3. 75 0.375 27

10 3, 75 4 0.25 40

10 4 4.25 0.25 40

10 " 4.25 4.5 0,25

10 4.5 4.75 0.25

10 4,75 5 0,25

P-2 10,0 10 1.75 2.25 0.5 20

10 2.25 2,625 0.375 27

10 2,625 3 0.375 27

10 3 3, 25 0.25 40

10 3, 2.5 3.5 0,25 40

10 3, 5 3. 75 0,25 40

10 3. 75 4 0.25

10 4 4,25 0.25

10 4,25 4,5 0,25

P-3 10,0 10 3, 25 3. 625 0,375 27

10 3. 625 4 0.375 27

10 4 4,25 0,25 40

10 4.25 4.5 0,25 40

10 4,5 4,6875 0.1875 53

10 4.6875 4.875 0, 1875 53

10 4,875 5 0.125

10 5 5. 125 0. 125

10 5. 125 5. 25 0.125

Ground, Engineering Consultants, Inc.

PERCOLAnON TEST RESULTS

APPENDIX B

Sewage Volume Calculations

Sewage Volume Calculations Two - Bedroom Structure.

1) General Flow: 2 bedrooms x 2 peoplelbedroom x 75galJday/ person...........,.,....300 gpd

2) Add 40% for clothes washer: 300 x 0,4 ....;,.................,.....,..,....,..........,. , 120 gpd

3) Add 20% for garbage disposal: 300 x 0,2 ....,.................,......,.................. , 60 gpd

4) Total Average Flow: 300 + 120 + 60.......,...........,..........,......,...........,....

480 gpd

5) Peak Factor. , . .. .. , .. , , .. .. , ... .. , , .. . , , ... ... .. . .. .., ,... .. . ,.. , , ... .,.. , , , . .. , . , .. ... , , '.. , . .., , ..1.5

6) Peak Flow for Design: 1.5 x480.. .. .. .. .. .. .. .. , .. .. .. .. . .. .. , .. .. . .. .. .. .. .. , .. ..... , .. .

720 gpd

Sizing of System

1) Septic Tank- per EPA and CDPHE guidelines for a two-bedroom house: 1, 000 gallon tank

minimum).

2) Absorption Area: ( Q/ 5) x ( t)"5, where t is 53 minutes per inch, Area equals 1, 049 feet2,

The minimum size of a chambered system in bed configuration is 682 feee, For chambers with

an area of 15.5 feet2 each, a minimum of 44 chambers should be used.

Sewage Volume Calculations Three - Bedroom Structure.

7) General Flow: 3 bedrooms x 2 peoplelbedroom x 75gallday/person",.,."....."" . 450 gpd

8) Add 40% for clothes washer: 450. x 0.4 ,. ,...., .""""", ". ,.., ..,., ,...."" ,. ;.,.", , 180 gpd

9) Add 20% for garbage disposal: 450 x 0,2........................,..,.....,.........,....,

90 gpd

10) Total Average Flow: 450 + 180 + 90,.........,..,......,..,....................,......,.. 720,gpd

11) Peak. Factor" ". . . , ., , " , ,. . .. ,." .,..., ....... ,. ... ... ,.. ., . ... ... .., " , " , ,. .., , " . . . ." , , , , .. . ,.1. 5

12) Peak. Flow for Design: 1.5 x 720 ............................;..........'................. , 1080 gpd

izii1g of System

3) Septic Tank- per EPA and CDPHE guidelines for a three-bedroom house: 1, 000 gallon tank

minimum),

4) Absorption Area: ( Q 15) X ( t).5,

where t is 53 minutes per inch, Area equals 1, 573 feee,

5) The minimum size of a chambered system in bed configuration is t,'023 feet2. For chambers

with an area of 15, 5 feet2 each, a minimum of 66 chambers should be used,

SPECIFICATIONS

1, All regulations of the Grand County Department of Environmental Health must be

complied with,

2, All construction equipment shall be kept off of the proposed absorption field area. Care

shall be taken not to compact the bottom of the absorption field or to " smooth" or smear

the ~oils, The bottom of the absorption field should be observed by the soils engineer

prior to backfilling.

3, Periodic inspections must be made by the Engineer or County Sanitarian aUhe following

points during construction:

a, After subgrade excavation and septic tank installation.

b, After placement of washed rock or chambers and pipe~, but before pipes are

covered.

c, Upon final completion of the project.

4. A septic tank shl111 have two (2) or more compartments or more than one (1) tank may be

used in series to provide the following capacity arrangement. The first compartment of a

septic tank shall hole between fifty (50%) and sixty-seven ( 67%) percent of the 'requiredeffective capacity.

5. The soil beneath the pipes entering and leaving a septic or aeration tank which has been

excavated shall be backfilled in 6" lifts' and mechanically compacted, Cast iron pipe or

pvc pipe meeting ASTM 3034 SDR 35 or Schedule 40 shall be used for 5 feet on either

side of the tank,

6, Provide a minimum of 6" of soil cover over the septic and 12" of soil cover over all

pIpes,

7, All surface drainage shall be ditched and diverted away from sewage disposal areas.

8, All disturbed surfaces, mounds and berms shall be ,covered with topsoil and heavilyseeded.

9, All washed rock shall be covered with straw, or untreated building paper, or a filter

f~bric such as Mirafi 140N before overlying soil layers are placed,

10, All washed rock will consist of gravel from 0.5 to 2- 1/2 inches in size,

11, Inspection pipe to be constructed of pvc p'ipe with the portion of the pipe penetratingthe gravel bed being perforated.

12, Septic tank must be located 50 feet from any water well.

13. Absorption field must be located 100 feet from any water well and 10 feet from property

lines.

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