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HomeMy WebLinkAbout900 Mayne St - 211108104005INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT Eagle County Department of Environmental Health PERMIT N2 0895 P.O. Box 850 - 550 Broadway Eagle, Colorado 81631 Telephone: 328-7311 or 949-5257 or 927-3823 YELLOW COPY OF PERMIT MUST PLEASE CALL FOR FINAL INSPECTION BEFORE BE POSTED AT INSTALLATION SITE COVERING ANY PORTION OF INSTALLED SYSTEM Owner: Richard L. Mayne Telephone: 524-7191 Address: 0828 Valley Road Gypsum CO 81637 System Location: Lot 111, Horsepasture Subdivision Licensed Installer: �I Number: OCT-E-- Conditional installation approval is hereby granted for the following: Minimum requirements: Gallon Septic Tank or Aerated Treatment unit Absorption area of dispersal area computed as follows: Percolation rate: I gem Inch in Minutes Absorption area per bedroom Sq. Ft. Number of Bedrooms X Sq. Ft. minimum requirement per bedroom - equals Total Sq. Ft. minimum requirement Special Requirements: 1250 Gallon septic tank. 180' of 10" SB2 - use at least two trenches. Date: November 29, 1988 Environmental Health Officer: 1- / Sid Fox CONDITIONS: 1. All installations must comply with all requirements of the Eagle County Individual Sewage Disposal System Regulations, adopted pursuant to authority granted in 25-10-104, C.R.S. 1973, as amended. 2. This permit is valid only for connection to structures which have fully complied with County zoning and building requirements. Connection to or use with any dwelling or structure not approved by the zoning and building departments shall automatically be a violation of a requirement of the permit and cause for both legal action and revocation of the permit. 3. Section III, 3.21 requires any person who constructs, alters or installs an Individual Sewage Disposal System to be licensed according to the regulations. FINAL APPROVAL OF SYSTEM: No system shall be deemed to be in compliance with the Eagle County Individual Sewage Disposal System Regulations until the system is approved prior to covering any portion of the system. INSTALLED ABSORPTION OR DISPERSAL AREA: 20 . FT. INSTALLED SEPTIC TANK: JP 5U GALLONS; 3 lZ DEGREES; 'r" a� FEET DESIGN ENGINEER OF SYSTEM: INSTALLER OF SYSTEM: ' -_&® / 7 l C, K_ PHONE: SEPTIC TANK CLEANOUT TO WITHIN 12"OF FINAL GRADE OR AERATED ACCESS PORTS ABOVE GRADE: YESNO PROPER MATERIALS AND ASSEMBLY: YES i'NO COMPLIANCE WITH PERMIT REQUIREMENTS: YES NO COMPLIANCE WITH COUNTY / STATE REGULATION REQUIREMENTS: YES G�NO COMMENTS: (Any item checked NO requires correction before final approval of system is made. Arrange a re -inspection when work is completed.) DATE (Final Approval)I�ENVIRONMENTAL HEALTH OFFICER: DATE (Re -Inspection) ENVIRONMENTAL HEALTH OFFICER: RETAIN WITH RECEIPT RECORDS Name of Applicant: Richard L. Mayne Name of Owner: Same PERMIT Amount Paid: $275.00 Receipt Number: 809 Date: 11-18-88 Cashier: A. Rusch Check # 2374 White and Pink Copies - Environmental Health Department Yellow Copy - Applicant / Owner APPLICATION FOR INDIVIDUAL SEWAGE DISPOSAL SYSTEM PERMIT ENVIRONMENTAL HEALTH OFFICE - EAGLE COUNTY Number: 32 64 P. 0. BOX 179 EAGLE, COLORADO 81631 949-5257 Vail 328-7311 Eagle 927-3823 Basalt PERMIT APPLICATION FEE $150.00 PERCOLATION TEST FEE $125.00 NAME OF OWNER: MAILING ADDRESS: QePp //ll� U Psu m PHONE: �S'� Y`- �/ 7 - NAME OF APPLICANT (If. different from owner): ADDRESS: PHONE: DESIGN ENGINEER OF SYSTEM (If applicable): nnnRF,�q • eP PERSON RESPONSIBLE FOR INSTALLATION OF LICENSED INSTALLER: YES ADDRESS: PERMIT APPLICATION IS FOR: ( X) NEW INSTALLATION LOCATION OF PROPOSED INDIVIDUAL SEWAGE DISPOSAL SYSTEM: e-Pry—si-cal ddress: Parcelumber: Legal Description: BUILDING OR RVICE TYPE Residential - ( ) Residential ( ) Residential - NUMBER OF PERSONS: (Check applicable Single Family Duplex Triplex ALTERATION ( ) REPAIR Lot Size: category): ( ) Residential ( ) Commercial Fourplex (Type) NUMBER OF BEDROOMS: WASTE TYPES Check applicable categories): Commercial or Institutional ( Dwelling ( ) Non -Domestic Wastes ( ) Transient Use ( )Garbage Disposal ( ) Dishwasher (Automatic Washer ( ) Spa Tub ) Other (Specify): TYPE OF INDI UAL SEWAGE DISPOSAL SYSTEM PROPOSED: Septic Tank Composting Toilet ( ) Incineration Toilet ( ) Vault Privy ( ) Greywater ( ) Chemical Toilet ( ) Pit Privy ( ) Aeration Plant ( ) Recycling, Portable Use ( ) Other ( ) Recycling, Other Use WILL EFFLUENT BE DISCHARGED DIRECTLY INTO WATERS OF THE STATE: ( ) YES ( NO IS SYSTEM DESIGNED FOR LESS THAN 2,000 GALLONS PER DAY: YES ( ) NO WATER CONSERVATION PLAN: ( ) YES (�_ NO NOTE: The Environmental Health Office may reduce the required absorption area upon approval of an adequate water conservation plan. SOURCE AND TYPE OF WATER SUPPLY: ( ) Well ( ) Spring ( ) Creek/Stream Give depth of all wells within 200 feet of system: If supplied 2bD conity water, give name of supplier:SIGNATURE: ����/C J� DATE: l /J INFORMATION BELOW TO BE FILLED OUT BY ENVIRONMENTAL HEALTH OFFICER: GROUND CONDITIONS: Percent ground slope F )A'T Depth to Bedrock (Per 8' profile hole Depth to Groundwater table PERCOLATION TEST RESULTS: Minutes per inch in Hole #1 S ro Minutes per inch in Hole #2 Minutes per inch in Hole #3 SOIL FINAL DISPOSAL BY: Absorption Trench, Bed or ( ) Above Ground Dispersal ( ) Under Ground Dispersal ( ) Other AMOUNT PAID: ��1� RECEIPT Pit ( ) Evapotranspiration Sand Filter ( ) Wastewater Pond NUMBER NOTE: SITE PLAN MUST BE ATTACHED TO APPLICATION. MAKE ALL REMITTANCE PAYABLE TO: "EAGLE COUNTY TREASURER". DATE: i l'& &8 (Environmental Health Dept. - Rev. 4/88) Richard L. Mayne 0828 Valley Road - Gypsum Perc Test Scheduled for: RTMENT Tuesday November 22, 1988 FEE: $125.00 ISDS APPLICATION NO. 3264 10.30 or 11:00 a.m. OWNER: Richard L. Mayne LEGAL DESCRIPTION: Lot #1 Horse Pasture Subdivision RURAL ADDRESS: 0828 Valley Road, Gypsum TYPE OF DWELLING: Residence— single family NUMBER OF BEDROOMS: 3 DATE OF PERCOLATION TEST: TYPE OF SOIL: cG�& &i TEST HOLES PRE-SOAKED: YES NO TIME I WATER DEPTH 1I INCHES OF FALL RATE 11 2 3 1 2 3 1 1 2 3 1 2 3 Z2- ' 2 2, rz" S� r a 2 I ! PERCOLATION RATE: � 01 �y - do - 00-r /14al�'r./ - u S E /Sp�'l?✓�1 RECOMMENDED MINIMUM SEPTIC TANK SIZE: (UOU I't�,c) k U-se 'i- RECOMMENDED MINIMUM LEACH FIELD SIZE: (000 ; 3 = d®y Apen 6 ®i too *1/� RECOMMENDED MINIMUM SQUARE FOOTAGE PER BEDROOM: 900 S�'T(?f+,T 0/ ( P'P.k,- A- ou.) SITE HAS BEEN REVIEWED AND TESTED FOR PERCOLATION RATE..o.�� Environmental Health Officer Sid Fox Date November 22, 1988 COMMENTS: 1 aSY3 COW,- Rev. 5/31/84 (..j i 1-C ) g© ' o � !U I H m n V1 o rnco Z C cn O cn rd o LA > '� o m z O m -� a z� d Z c 9-- �C w Cr o t7l, Q� 1 ii T . n 0 y a .e r 0 E 6 y T Q � I two' %ONK 4 ws s 111 v I F YURE * SOIL CONSERVATION SERVICE of A(1, inred by UNITED STATES DEPARTMENT ATION DISTRICT COUNTY EAGEL 7 C; 0 FARM N o.1 3 5 DATE'S �,EO VIRL, MAYNE' OWNER . ... ....... ........ SCA�LEG in. ACRES OPERATOR_— . ..... . E i',-G=� .. COUNT_�,, COL011100 PHOTO NoDM—G-6 lJ o, ......... . . j", , $­, Irri Ycd C eel A Ila Ac- —7-7 irea II.Y BAGIZ GL"o. I RL ........... ... . . .. ......... OWNER OPERATOR ...... ..... . ......... ... - 2 rr i5N r Ila y/:j tl -) Hay 12 7Ac/ ®r-) 6Ac ti' 'T, SO LL ()()TJIITY co-'SUTV 92- 35 DA FARM NO-'. .. . ........ 6 ill ACRES SCALE c OLORIVD0 PHOTO NCj)orz,-6-b ROUTE FORM EAGLE COUNTY ENVIRONMENTAL HEALTH OFFICE Rich 2 16J \/I A' 114028 ap %1^11024 IPA I-Kig%e i Date Routed 0A2j-V%A0E1x.V Application No. Please review the attached Individual Sewage Disposal System Permit Application and return it with this completed form the the Environmental Health Office. PLANNING: Complies with - YES NO IREVIEWED BY DATE Subdivision Regulations: Zoning Regulations: BUILDING: Complies with - YES NO REVIEWED BY DATE Building Permit Applied For: Building Permit Issued: Recommend Approval: COMMENTS: ENGINEER: Complies with - COMMENTS: YES NO Roads: Grading: Drainage: Recommend Approval: ENVIRONMENTAL HEALTH: Complies with -- YES Floodplain Permit Necessary: I.S.D.S. Regs. Compliance: Recommend Approval: COMMENTS: D mC ?a i ssoe To S Izsn Ggaop S£Pi"�c-r-tPr, 10O 0'r— Loll S#zz-- - US P,-" �epm-r - �.�•1'�L REVIEWED BY DATE NO REVIEWED BY DATE �. � � . 4 �yy,..n. ++r:m:.. �. � x t `>. Z::.v,.,:ev t'1 .. � ����, ROBERT K. BARRETT CONSULTANT IN ENGINEERING 13EDLOGY Introduction ------------ 530 FOY DRIVE GRAND JUNCTION, GOLORADO B1501 1-(303) 243.0058 PRELIMINARY GEOLOGY & SOILS REPORT * MAYNE SUBDIVISION * This report describes general soils and geologic conditions for the Mayne Subdivision, located approximately one mile south of Gypsum, Colorado The subdivision is approximately 140 acres and will primarily.consist of single family dwelling sites. [Dater and sewer service will be provided by the Town of Gypsum. This report addresses soils and geologic conditions pertinent to this development plan. Purpose The purpose of this report is to provide preliminary soils and geologic data to the Owner and to Eagle County so that general data can be available at an early phase of planning and review. Scope Consistent with the purpose of the preliminary investigation, the scope of this report is limited to defining general engineering geologic factors that will influence development of the Mayne Subdivision. The report also describes proposed additional investigations required for the preparation of the final report. The contents of this report are based on data provided by Mr. John L. MacKown of the Johnson and Kunkel Land Surveying Company, and included: geology and geologic hazard mapping of Eagle County by Dr. C.S. Robinson & Associates; Soil Conservation Service soil mapping and description; and a preliminary development plan of the Subdivision. The site was also reviewed in the field. -1- ROBERT K. BARRETT CONSULTANT IN ENGINEERING OEOLOOY Geology 530 FOY DRIVE GRAND JUNCTION, COLORADO 61501 1-(303) 243-0038 Bedrock exposed on and underlying the project is limited to the Eagle Valley Evaporite consisting of buff, grey and brown gypsif erous shale, siltstone and fine grained sandstone. Bedrock is exposed on the southeast edge of the proposed development and appears to become progressively deeper under surface soils to the north and west. Soils covering the proposed development consist of two major types. The first is terrace gravels originating from Gypsum Creek and are found in the northwest area. The remainder of the project, excluding the exposed bedrock area at the southeast corner, is covered by sandy, clayey silts derived from the Eagle Valley Evaporite. Development Considerations -------------------------- The property appears to be divided into three areas by engineering soils and geologic conditions: 1. Northwest: Terrace gravels at or near the surface: This area is generally favorable for development. It is advisable to have any foundation examined.by a qualified engineering geologist or soils engineer at the -time of excavation. This. is the only -recommendation for construction on these soils. _ 2. Central: West of the upper irrigation ditch: Soils in this area consist of silts with admixtures of sand and clay derived from the Eagle Valley Evaporite. Due to the cyclic wetting and drying over several years resulting from irrigation practices, most of the prob- lems inherent in these soils have been mitigated. Development could proceed as planned, and it is recommended that foundation excavations be inspected by a qualified engineering geologist or soils engineer. 3. East and Southeast: Above the upper irrigation ditch: Soils covering this area consist of silts derived from the Eagle Valley Evaporite that are subject to hydrocompaction (may collapse when saturated), are highly erodable and are subject to piping. They may be corrosive to steel and concrete. An additional consideration is the mudflow potential from drain- ages entering on the east. Lots in the area above the ditch can be developed; however, certain studies and precautions are recommended: -2- ROBERT K. BARRE" CONSULTANT IN ENGINEERING GEOLOGY 530 FOY DRIVE GRAND JUNCTION, COL❑RADO B1501 14303) 243-0058 a) The developer should take into account the mudf low potential and either design preventive measures or arrange the plan to re- strict dwellings in the affected areas. b) Included in the sales document „should , be provisions disal- lowing irrigation, requiring "waterproofed" pipes and requiring the buyer to have his improvement plan approved by a qualified engineering geologist or soils engineer prior to issuance of a building permit. Summary and Conclusions ----------------------- Site geology on the Mayne Subdivision consists of Eagle Valley Evaporite bedrock and derived soils, and Gypsum Creek terrace gravels. Geologic and soils conditions are favorable over most of the proposed development with limited areas requiring site -specific investigations. The final report should supplement this report with- appropriate geology and soils mapping. Proposed Additional Investigation --------------------------------- It is proposed that soil areas be verified and defined by subsurface investigations and mapped accordingly. Potential mudflow areas should be defined and mapped. -3- O Ic .r Y ►7 It 41 d m J SOIL CILARACTERISTICS Depth to Bedrock : deep Texture Surface : loam, fine sandy loam Suhsoil : loam, fine sandy loam Substratum : stratified fine sandy loam Unified/AASHO Classification: M L. SM; A-4 Permeability (below 2 feet) : moderate to moderately rapid Percent Coarse Fragments (gravel, cobble, stone) : 0 to 5 percent Soil Reaction (pIE) . 6.1 - 7.3 Shrink -Swell Potential : low Potential Frost Action I (surface) moderate Flood Hazard none (may collect runoff Hydrologic Group B Corrosivity - Steel high - Concrete : law DEGREE & KIND OF LIMITATIONS (0 is Slight, M is Moderate, S is Severe) Septic Tank Absorption Fields 0 Sewage Lagoons S - seepage, slope Sanitary Landfill - Trench . M - seepage - Area : M - seepage Shallow Excavations 0 Dwellings w/basements . M - low strength w/o basements : M - low strength Local Roads and Streets : M - low strength SUITABILITY AS A SOURCE OF.... Daily Cover for'Landfill Good Topsoil Good Sand : Unsuited Gravel Unsuited Roadfill : Fair - lour strength OT`HFR SOIL FEATURES Formability. rate may cause a pollution hazard. "ADVANCE COPY SUBJECT TO CHANGE" NOT TO BE USED IN PLACE OF ON -SITE: INVESTIGATION. SOIL CHARACTERISTICS Depth to Bedrock : dilep Texture Surface lornm, li,_ht clay loam Subsoil Substratugi loam, lirkit clay loa.*n Unified/AASHO Classification: YL, CL; A-11, A-6 Permeability (below 2 feet) : mod,3rntoly slow to moderate Percent Coarse Fragments (gravel, cobble, stone) : 0 to 5 percent Soil Reaction (pli) : 7.4 - 9.0 : soil has a high gypsum content f+ Shrink -Swell Potential : moderate Potential Frost Action (surface) : moderate Flood Hazard : none Hydrologic Group _ B - Corrosivity - Steel : high : soil has a high gypsum content - Concrete high : soil has a high gypsum ccntent DEGREE 6 KIND OF LIMITATIONS.... .. (0 is Slight, M is Moderate. S is Severe) Septic Tank Absorption Fields - _ -- M - pormability rate ++ Sewage Lagoons : k} - seepage Sanitary Landfill - Trench : M - seepage - Area : hi - soepal;e Shallow Excavations -0 Dwellings w/basements - M - low strength w/o basements td= - low strength Local Roads and Streets M-_frost•action, low strength SUITABILITY AS A SOURCE OF.... Daily Cover for Landfill Topsoil Sand Gravel Roadf ill Poor - seepage Good Unsuited : Unsuited : Poor - low strength ++ 0711ER SOIL FEATURES •• :his :oil has a high gypsum content; it is very susceptible to piping failuro. Sinkholes develop, and the introduction of effluent to the soil ma_,r cause a pollution hazard to groundwater. "ADVANCE COPY SUBJECT TO CHANGE" NOT TO BE USED IN PLACF. OF nN-SITE. INVESTIGATION. Map IMit No. SOIL. CHARACTERISTICS Depth to Bedrock cio�p Texture ' Surface lna n, silt 1- nam Subsoil loam, Silty Clay 10Km Substratum 'Loam, silt lonm Unified/,AASI10 Classification: i;L, CL, CL-i:iL, CH; A-4, A-G, A-7 Permeability (below 2 feet) : in,)&,,ratoly glow to modorate Percent Coarse Fragments (gravel, cobble, stone) . 0 to 5 percent Soil Reaction (pII) 7.4 - 8.4 Shrink -Swell Potential mod arota Potential Frost Action" (surface) mob eraty Flood Hazard none Hydrologic Group R Corrosivity - Steel high - Concrete low DEGREE & K114D OF LIMITATIONS (0 is Slight, M is'Moderate, S is Severe) Septic Tank Absorption _. Fields M - permeability rate Sewage Lagoons NI to 7% - seepage; S over 70' - seepage, SteO p SIO UeS Sanitary Landfill - Trench M - seepage -- Area 0 Shallow Excavations 0 Dwellings w/basements 0 w/o basements hi--- law strength Local Roads and Streets SUITAISILITY AS A SOURCE OF.... Daily Cover for Landfill Topsoil Sand Gravel Road f.ill OT}IF.R SOIL FEATURES M - low strength . Fair - hard to pack, seepage Good Unsuited trns wit sd . Poor - low strength, frost action "ADVANCE. COPY SUBJECT TO CHANGE." NOT TO BE USED IN PLACE OF ON-ST1'i: IN'VE." CAT TON. 1 .1 `s l•Ill l ITV. ' SOIL Cl1ARACTFRISTICS Depth to Bedrock 0H3p Texture Surface Conra1.3 •sUntly loom Suhcoil sxrnl,y locum, lonin Substratum snndv loom, loam, silt loam 1Inified/AASHO Classification: ML, SC; A-4, A-2 Permeability (below 2 feet) n-+dorati to maid+3ratel,y rapid Percent Coarse Fragments (gravel, cobble, stone) : O to 5 r)orcont Soil Reaction (pll) 7.9 - 8.4 Shrink -Swell Potential low Potential Frost Action (surface) mo'dorate Flood Hazard none Hydrologic Croup }3 Corrosivity - Steel hi,rh - Concrete low DEGREE & KIND OF LIMITATIONS (0 is Slight, M is Moderate, S is Severe) Septic Tank Absorption - Fields 0 .. - Sewage Lagoons Sanitary Landfill - Trench : M - seepage - Area : M - seepage i Shallow Excavations.. ; 0 Dwellings w/basements 0 W/o basements Local Roads and Streets M - frost action SUITABILITY AS A SOURCE OF.... Daily Cover for Landfill : Fnir - seepage Topsoil : Good Sand : Unsuited travel : Unsuited Roadfill Fair - frost action +• OTH@R SOIL FEATURES �• '.hr; surfnco 15 to 20 inchesnf this soil has a high content of dark c-)llood volcanic ash, presumably from the Dotsero blowout. It is raoidly permeable, and has low strenCth. "ADVANCK COPY SUBJE.C:T TO CHANC.17" NOT TO It); USED TN PLACE. Ol' ' d RLG Orthents - Gypsum Outcrop Complex F•� ma Unit No. BLGan i 1 ) bpj�.,Jrit SOLI,'. CSABACTERISTICS z,. i' t1f •1 Ippth to bedrock rhallcw; bedrock exposures „! ! t 1 t �Z Texture Surface > t s r Subsoil - Sc.b s tratum Unified Classification Yl Permeability (belox 2 feet) Percent coarse fragments. (gravel,. cobi�le, stone} •. Salinity (1.01 250c}... ; drink -smell Potential ' Pptential froet-action (surface) _ .high runoff Mood hazard Rydrologic Group.. Corrosi�rity Steel high .Concrete high DEGREE KIND OF. LIMITATIONS..: . (o -is Slight) M ie Moderate,. S is 'Severe). Septic Tam Absoxp'tlon Fields'.' Severe Limitations for all statod^uaea. f ,.. Sewage Lagoons t. ganitary .Landfill Trench She--low'bccavationa Dwellings W basements • V/o basement® j SUITABILITY l.S• A SOURCE OF... y. Topsoil ii l j rl'�t1,7� Sand Gravel Y J 1 Oadf i11 v }. \ 1 f \ f 1L q.,f TIGATION..:1 v PLACE OF ON -SITE INVFJS u NGE. NUT TO BE .U. SID IN 1, f�yrt AW A11uv4Lal. I,and-A11• v� --l. ''_and cor-sists of areas of unconso.", da`sci ajl?1�F*j?7r1, p'??erai. stra�i.f ed and varyinfn widely in texture, ^r.entl v by stre 2jr,r;, and subject ' to P'regoen. c.:e-rges through st.reajr: overflow. PL Rough h �)r('�t'r: and sv7?lV land. lhi.� cr-rnint-s C,f very. steep and vdth rock outcrops an(i stones RLG - G`IPSuh oo'Tc-RoP5� ^.ormY,)n in C."'Urance. Phis 1aml i- br:);cen by 5"n(-LC> W 50,1 L S. WITH mime.rous i-r-- -,Pynti-tten. draina�;e channel o. Tt BED o�= �Ex Po u has a cover �f vegj '-ati-on, wnereas the - um.t is 1* rren. RLE Shale Rnckl-ind--fihi s is land that consist; of harr-er, shale expo,-:.: rFls w-, th rock covering a ! :t8.rp? FF;-cen*a!�e f the m2rf ce. This rock can ! he of d:f'Perpnt, or-gi-ns such as glaciated cobbles, '.-:3�tslt'c hr�::lder9,nistCne frame i+;nt;?, et I MIS Rockland- This of. areas havi r.g 25 to percent of th- murface covered with rock. Whet— 11ttle c� 1 there i q, nornsl? J is very 9nall ors. There he a sparne growth of trees anti shn1l)s where the c2 ]Matte and other conditi-ans arc ravorahle. i FINAL SOILS AND ENGINEERING GEOLOGY REPORT: MAYNE SUBDIVISION Introduction: This report presents findings of the engineering geological investigations on the Mayne subdivision, which is located about one mile south of Gypsum, Colorado. The investigation was conducted during the fall and winter of 1976-1977. Summary and Conclusions: The investigation included field reconnaissance and 14 backhoe test pits. It was found that a variety of soils exist on the property and that all areas below the Chatfield Ditch are readily buildable. Areas above the Chatfield Ditch are buildable, but will require site - specific, detailed soils investigations. Due to the size of these lots, it has been written into the covenants that this detailed investigation is incumbent on the buyer. Recommendations: All improvements should be evaluated by a qualified engineering -geologist or soils engineer prior to construction. This is, in essence, an' inexpensive insurance that soils and geologic conditions are compatible with the improvement. This evaluation is usually required by many financing organizations and the cost is usually a minor fraction of the total investment. Improvements north of the Chatfield Ditch, as stated in the covenants, are to be investigated by a qualified engineering geologist or soils'engineer prior to issuance of a building permit. This expert must evaluate the impacts* of construction - cuts, fills and buildings - on the possible fragile soil structure. This evaluation should address all aspects of long-term occupancy including paving of driveways, concrete patios, and irrigation of gardens, lawns, and flower boxes. Pre -wetting, where incorporated, must be designed by this expert to insure the soils are uniformly and completely wetted. Pre -wetting design must also take into account adjacent properties and other improvements such as roads and underground services. Sulphate resistent concrete (Type 2) should be used throughout the develop- ment. Geology: Geology on the proposed Mayne Subdivision is limited to alluvial, colluvial and aeolian soils. These soils may be divided into five categories for purposes of this report. 1. Terrace gravel: Most of the proposed subdivision is underlain by coarse terrace gravels deposited by Gypsum Creek. These gravels are distinctibely red and contain a high percentage of Maroon formation, silt, sand and gravel. . 2. Aeolian silt: Wind-blown red silt is found in a cornice like feature on the northwest extreme of the property. This cornice apparently developed along the western edge of the terrace due to the prevailing westerly wind pattern. The air currents moved down the mountain side on the west side of Gypsum Creek Valley, across Gypsum Creek and up the eastern side. The edge of the terrace caused turbulence and a local slowing of wind velocity, thus causing deposition. These deposits are also found along the southeast portion of the property, another logical area for local reduction in wind velocity. The aeolian soils are mixed with local.col- luvium in the sou-theast area. These aeolian deposits are distinctly red. The mountain side to the west is formed by a thick section of Maroon formation bedrock - hence the supposition that the wind deposits are a local phenomena. These deposits are probably responsible for development of the drainage shown on the test hole layout between holes 2 and 14. Drainage paralleling the main drainage in an area such as this is exceptional. 3.' Volcanic ash: Fine, dark red and grey volcanic ash was found over the entire property and is known to exist in many places in the Gypsum area. The Dotsero Volcano, which erupted some 5,000 years ago, is thought to be the source of the ash. Prevailing wind patterns lend themselves to this supposition, and the predictable depths at which the ash is found also lends credance to this theory. 4. Tenderfoot Gulch stream deposits: Gray to buff soils consisting of clay to small gravel, derived from the Eagle Valley evaporite formation and transported by :Tenderfoot Gulch, are found over most of the proposed subdivision. These soils vary in gradation, typically coarser in the east -central area, which is the upstream side of the property. Ash is found in a uniform layer of up to 1 foot in thick- ness under most of this area. The ash is nearest the surface on the western side of the property. Test holes 12 and 13, on the eastern side, predictably revealed the deepest of soils containing ash. - 2 - 5. Alluvial and colluvial soils: Above the Chatfield Ditch are found non -irrigated soils of Evaporite origin. In the southeast, these soils have been transported only a very short distance from the hillside above on the east. Colluvium is intermixed with Tenderfoot Gulch alluvial deposits above Test hole 12. These soils differ from soil type 4 (Tenderfoot Gulch deposits) only in soil structure (particle arrangement). Soils origin- ating from fine-grained sedimentary rocks on steep, barren hillsides in an arid climate are often transported by mud flows. These flows, in depths of a few inches to a foot or more, dry out, leaving a very open or porous soil particle arrangement. This is sometimes called "honeycomb" structure. Kept dry, these deposits are typically quite strong and - - capable of bearing considerable weight. Saturated, they may become markedly temporarily unstable and reduce in volume (settle) up to 20% in height. In the irrigated areas below Chatfield Ditch, the settlement potential has been mitigated by deep saturation; however, the potential remains in soils, above the Chatfield Ditch. Due to the variability in depth and settlement potential of collapse susceptible soils on each of the large lots, it was not deemed economically practical to develop a detailed sub- surface soils map for each parcel. This is better left to the buyer, who can limit the study to a specific construction plan and to a specific site on the lot - the site on which the buyer prefers to build. Developmental Factors: Geological factors that will influence development of the proposed subdivision are described in this section. Soil types are defined under the previous heading, Geology. Soil types 1 and 3: These are granular, angular and free draining, and have a relatively high bearing capacity. These soils lend themselves well to the proposed development. The ash layer could be detrimental to leach field function- ing; however, the plans call for connecting each unit to the Gypsum sewer. It is also possible that basement construction in the ash layer may be wet, especially in the area of test holes 3 and 14. The ash is quite permeable and may carry a flow of water, depending on surrounding activi- ties. Basement walls should be waterproofed. Soil types 2 and 4: These soils have been alternately wetted and.dried over several years. There appears to be no unusual characteristics with either of these soils, and both lend themselves to the proposed development. -3- Consistant with the recommendations,. it is felt that a qualified engineering geologist or soils engineer should review all improvement plans. This person should be able to recognize a site -specific problem and assist in its mitigation. This recommendation is in no way intended to infer that these soils are not compatible with most types of develop- ment. Soil type 5: While buildable, this area requires careful evaluation during the improvement design phase. These soils are generally susceptible to collapse on wetting. An improvement that can be kept relatively light, coupled with free -draining landscape plan without any irrigation, may be acceptable on certain portions of most lots above the Chatfield Ditch. All pipes carrying liquids must be constructed with care and "water -proofed" as per standard plumbing codes. Prewetting could mitigate settlement potential and allow normal construction and subsequent irrigation - lawn, garden, etc. Prewetting is not unduly expensive in materials, but considerable time may be involved in accomplishment. An owner could conceivably do this ahead of construc- tion, if he were living in -the area and could attend his project, say, each evening. This may take'2 to 6 months, but direct costs would be relatively small. Mudflow Mitigation: This discussion necessarily contains subjective evaluations, since neither occurrence and hydraulic properties of mudflows are exactly understood, nor are numbers available for depth, frequency and areal extent. It is thought that'flows"form during intense, short rainfall. Long duration rainfall may dilute -the flow to very muddy water.- Thus -the size -of a typical flow would be small -.`In 5000 years of both stream and mudflow deposition, the maximum deposition on the Mayne property was about 14 feet — test hole 13 - which yields a deposition rate of .003 feet per year, and reinforces the supposition that flows are small and infrequent. (None of the exposed soil profiles in the test holes exhibited distinct, measurable mudflows.) John MacKown of Johnson and Kunkel Land Surveying Company has designed the mudflow barrier to extend 1,900 feet across the northeast portion of the property. The minimum 2 foot high berm will store over 20 acre feet (33,000 yards) of mudflow, depending on viscosity. This berm, in the judgement of the author, is adequate. MacKown has also evaluated the 100 year rainfall potential for the proposed subdivision. Ponds: Two small ponds are planned in the existing drainage in the northwest portion of the property. Maximum planned depth for these ponds is seven feet. It is my opinion that these ponds will hold water and will pose no danger to any surrounding activity. It is recommended that the area under the retaining embankments be stripped of all organic soils and that the embank- -4- ments be compacted to 95% of maximum density as per AASHTO test T-99. Expansion of the ponded area to obtain embankment material may be done laterally, but not vertically. Embankment materials should consist of the clayey silt soils, and must be free of deleterious material. Acknowledgement: The author wishes to acknowledge the assistance and cooperation received from the owner, Dick Mayne; David I:unkel and John MacKown of Johnson and Kunkel Land Surveying Company; and Harold Denton, project architect. References: Robinson, C.S., Geological Maps of Eagle County, 1974. Navy Design Manual, NAVFAC DM-T, March, 1971c-, - -- -- -5 TEST HOLE LOCATIONS BACKHOE TEST'PIT LOGS MAYNE SUBDIVISION 11/23/76' HOLE 1 0-3.0 organic sand, silt and volcanic. ash, damp. 3.0-10.5 silt, red, damp (aeolian). 10.5 bottom of hole HOLE 3 0-4.0 silt and clay, damp, slightly organic 4.0-15.5 silty clay, brown, wet, medium stiff. 15.5 bottom of hole HOLE 5 0-1.0 topsoil 1.0-7.0 sandy silt with some ash, damp. 7.0-8.0 volcanic ash, wet, water bearing, permeable 8.0-12.0 silty clay, clayey silt, wet, soft. 12.0 bottom of hole HOLE 7 HOLE 2 0-2.0 2.0-7.5 7.5-8.0 8.0 HOLE 4 organic sand, silt and volcanic ash, damp. silt, red, damp (aeolian) gravel, red, damp bottom of hole 0-1.0 top soil 1.0-7.5 clayey silt, damp 7.5-8.5 volcanic ash, angular, black, 1/8" maximum particle size, water bearing, permeable 8.5-13.0 silty clay -clayey silt, wet, soft 13.0 bottom of hole HOLE 6 0-1.0 topsoil 1.0-6.0 silt, sand,reworked ash, damp. 6.0-8.0 volcanic ash, wet 8.0-9.0 clayey silt, silty clay, wet, soft 9.0 bottom of hole HOLE 8 _ (1-3._Il ____-_ . BACKHOE TEST PIT LOGS PAGE 2 HOLE 13 0-13.0 sandy silt, dry to damp 13.0-13.5 volcanic ash mixed with stream pebbles, damp. 13.5 bottom of hole HOLE 14 0-3.0 sand, silt, clay, dry. 3.0-4.0 volcanic ash, damp 4.0-10.0 sand, silt, clay, damp 10.0-11.0 gravel, red, damp. 11.0 bottom of hole 60.00' O p W U O b N 0 0 � • a 2 m S. 00.04'00"£. S. 00.04' 00" E. 358.13' 254.3' 'I m yI 0 a mo y pb O A Oy to m Y ' 4 i o � �. � c i'n y � +� Tr p � S 00 • 9'00 O It m v; Jf .yL a . e � '+' 3 • ;� < �' M r Ir 9 . 0004' 35 . 00"E. 8.90' 04.5 S > » o z -+ p� ;i•'. 4 9_ 3Z In14 •pe 5 Y E. S�SSfa aVy o o m c n m ,� n • ij S. 00. 04' 00E. 631.18, 1 e i .• n'-2}ti} —S. OI•Sf'/9"W.—...._42544' -- �\ .. O ' � \ � „ 86 7 S V W b \ - c Ir{l j to S. 00. 04' 00'E. 6SI.7J' \ rCti q 1 si' apUYo r> na \ ,tc• ; u nl K 0/'5V 48 E. 277.101, m N.00.32' 56"E. 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COSTS TOTAL JOB COST GROSS PROFIT LESS OVERHEAD COSTS OF SELLING PRICE NET PROFIT JOB FOLDER Product 278 ®® NEW ENGLAND BUSINESS SERVICE, INC., GROTON, MA 01471 Printed iri U.S.A. JOB FOLDER