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HomeMy WebLinkAbout52 Red Canyon Dr - 194125402013 - OWTS-5-14-10760Work Classification: NewPermit 1001 CRAZY HORSE CIR EDWARDS CO 81632 Address Owner Information Permit Status: Active Project Address 194125402013 Permit Type: OWTS Permit Permit NO. OWTS-5-14-10760 Expires: 1/28/2015 Issue Date: 9/30/2014 Parcel No. 52 RED CANYON CR RD Private Wastewater System Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970)328-8755 Fax: (970)328-8788 Phone: 970-471-1957 Cell: Inspection For Inspections call: (970) 328-8755 Inspections: IVR OWTS Final Inspection 095 PhoneEngineer(s) (970)945-7988HP GEOTECH Contractor(s)Phone Primary ContractorLicense Number BRONN EXCAVATING (970)328-6476 Yes16-14 DEBRA WHITMAN MCGRATH TRUST DEBRA WHITMAN MCGRATH TRUST Permitted Construction / Details: Installation of the OWTS as re-designed by HP Geotech in their report dated September 11, 2014, signed stamped and dated September 30, 2014. The OWTS is designed to serve a three bedroom residence as well as a caretaker unit located in an indoor riding arena for a total capacity of four bedrooms. System consists of a Front Range Precast 2,000 gallon three compartment electric lift septic tank with effluent screen on the outlet tee of the second compartment and a Goulds PE51 installed in the third compartment. The soil treatment area consists of 1,200 square feet of soil treatment area credit via 60 Quick 4 Infiltrator chambers placed in five shallow, pressure-dosed trenches with 12 chambers installed in each trench. Install exactly as indicated in the design with the Orenco V6605 ADV being the high pint of the pressure distribution network. Be sure to double encase the building sewer line as shown on the plans and bring access lids to the tank and ADV to grade. Do not install in wet weather and contact the design engineer to conduct inspections during construction and to certify the proper installation of the system, especially to verify that the pump is operational and the settings deliver the designed dose. As-built drawings along with the certification letter are required to be submitted to Eagle County Environmental Health prior to the use of the system and occupancy of the dwelling. Issued by: Environmental Health Department, Eagle County, CO October 01, 2014 Date Customer Copy Terri Vroman CONDITIONS: 1. THIS PERMIT EXPIRES BY TIME LIMITATION AND BECOMES NULL AND VOID IF THE WORK AUTHORIZED BY THE PERMIT IS NOT COMMENCED WITHIN 120 DAYS OF ISSUANCE, OR BEFORE THE EXPIRATION OF AN ASSOCIATED BUILDING PERMIT 2. ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN C.R.S. 25-10-101, et seq., AS AMENDED 3. 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 WILL RESULT IN BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT 4. CHAPTER IV, SECTION 4.03.29 REQUIRES ANY PERSON WHO CONSTRUCTS, ALTERS OR INSTALLS AN INDIVIDUAL SEWAGE DISPOSAL SYSTEM TO BE LICENSED Work Classification: NewPermit 1001 CRAZY HORSE CIR EDWARDS CO 81632 Address Owner Information Permit Status: Active Project Address 194125402013 Permit Type: OWTS Permit Permit NO. OWTS-5-14-10760 Expires: 1/28/2015 Issue Date: 9/30/2014 Parcel No. 52 RED CANYON CR RD Private Wastewater System Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970)328-8755 Fax: (970)328-8788 Phone: 970-471-1957 Cell: Inspection For Inspections call: (970) 328-8755 Inspections: IVR OWTS Final Inspection 095 PhoneEngineer(s) (970)945-7988HP GEOTECH Contractor(s)Phone Primary ContractorLicense Number BRONN EXCAVATING (970)328-6476 Yes16-14 DEBRA WHITMAN MCGRATH TRUST DEBRA WHITMAN MCGRATH TRUST Permitted Construction / Details: Installation of the OWTS as re-designed by HP Geotech in their report dated September 11, 2014, signed stamped and dated September 30, 2014. The OWTS is designed to serve a three bedroom residence as well as a caretaker unit located in an indoor riding arena for a total capacity of four bedrooms. System consists of a Front Range Precast 2,000 gallon three compartment electric lift septic tank with effluent screen on the outlet tee of the second compartment and a Goulds PE51 installed in the third compartment. The soil treatment area consists of 1,200 square feet of soil treatment area credit via 60 Quick 4 Infiltrator chambers placed in five shallow, pressure-dosed trenches with 12 chambers installed in each trench. Install exactly as indicated in the design with the Orenco V6605 ADV being the high pint of the pressure distribution network. Be sure to double encase the building sewer line as shown on the plans and bring access lids to the tank and ADV to grade. Do not install in wet weather and contact the design engineer to conduct inspections during construction and to certify the proper installation of the system, especially to verify that the pump is operational and the settings deliver the designed dose. As-built drawings along with the certification letter are required to be submitted to Eagle County Environmental Health prior to the use of the system and occupancy of the dwelling. Office Copy October 01, 2014 Issued by: Environmental Health Department, Eagle County, CO Date Terri Vroman CONDITIONS: 1. THIS PERMIT EXPIRES BY TIME LIMITATION AND BECOMES NULL AND VOID IF THE WORK AUTHORIZED BY THE PERMIT IS NOT COMMENCED WITHIN 120 DAYS OF ISSUANCE, OR BEFORE THE EXPIRATION OF AN ASSOCIATED BUILDING PERMIT 2. ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY INDIVIDUAL SEWAGE DISPOSAL SYSTEM REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN C.R.S. 25-10-101, et seq., AS AMENDED 3. 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 WILL RESULT IN BOTH LEGAL ACTION AND REVOCATION OF THE PERMIT 4. CHAPTER IV, SECTION 4.03.29 REQUIRES ANY PERSON WHO CONSTRUCTS, ALTERS OR INSTALLS AN INDIVIDUAL SEWAGE DISPOSAL SYSTEM TO BE LICENSED ziaj/- aa4n DEPARTMEN ? &A ENVIRONMENTAL HEALTH (970) 328-8755 FAX: (970) 328-8788 TOLL FREE: 800-225-6136 www.eaalecounty.us EAGLE COUNTY P.O. Box 179 500 Broadway Eagle, CO 81631 www.eaglecounty.us OWTS PERMIT # 044 7J - 5—f rC U BUILDING PERMIT # q 144-10 cj -IQ INCOMPLETE APPLICATIONS WILL NOT BE ACCEPTED (SITE PLAN MUAT BE INCLUDED) FEE SCHEDULE APPLICATION FEE $800.00 MAJOR REPAIR FEE $800.00 MINOR REPAIR FEE 400.00 This fee includes the OWTS Permit, Site Evaluation (Percolation Test, or Soil Profile Observation) and Final Inspection. Additional fees may be charged if a re -inspection is necessary, or a pre -construction site visit or consultation is needed. The re -inspection fee is $135.00 Make all remittance payable to: Eagle County Treasurer. Property Owner: Phone: '1 % 0 — (47 ( — ( 9 S-] Mailing Address: ID o i z�v-�'`emailQ- Registered Professional Engineer: --Phone: _Se_,Z_ / Applicant or Contact P rson: Phone: Licensed Systems Contractor: License # Brcrno 40- Company / DBA: Phone: br0 n Mailing Address: - �� email Permit Application is for: New Installation Alteration Repair Location of Proposed Onsite, W water jreatment Sy tem: Legal Description: ` �`" � S2Z e l Tax Parcel Number: �. -�� r �� i 3 Lot Size: Assessor's Link: www.eaglecountv.usJpatie/ Physical Address: 4:�; Z C_ � e_-1C Building Type: Residential / Single Family Number of Bedrooms: Residential / Multi Family Number of Bedrooms: Commercial / Industrial* Type of Use: *These systems require design my a Registered Professional Engineer Type of Water Supply:y Private Well Spring Surface Public If Public Name of Su Applicant Signature: ************************************************************************************* Office Use Only Amount Paid: Receipt #: Check #: iW Date: o� DEPARTMENT OF ENVIRONMENTAL HEALTH (970)328-8755 FAX: (970) 328-8788 TOLL FREE: 800-225-6136 www.eaglecouon,us EAGLE COUNTY P.O. Box 179 500 Broadway Eagle, CO 81631 www.eaglecounty.us OWTS PERMIT # r, f-G21/ BUILDING PERMIT # O INCOMPLETE APPLICATIONS WILL NOT BE ACCEPTED (SITE PLAN MU T BE INCLUDED) FEE SCHEDULE APPLICATION FEE $800.00 MAJOR REPAIR FEE $800.00 MINOR REPAIR FEE 400.00 This fee includes the OWTS Permit, Site Evaluation (Percolation Test, or Soil Profile Observation) and Final Inspection. Additional fees may be charged if a re -inspection is necessary, or a pre-concmwfl�� consultation is needed. The re -inspection fee is $135 OR �- 6017 JEREMIAH JOHN BONLOG HOMES, LL pIIMONT. CO 80436 a Ile_ it Z {4 82-3B6-1070 ata $ $moo Evax aan National. dank. rgTtCH. colorabo Eo437 wx. " Uotl VM.COLO O n+ Location of Proposed Onsite,Wastgwater�Treatxnent Sy tem: Legal Description: 1a 1 1CeJd C-1u.�jo.,.s� , S2 Tax Parcel Number: All 6� 5VO r-52— 0 63 Lot Size: Assessor's Link: www.eayJecountY.us/Patie1- Physical Address: Z (ze-a Building Type: Residential / Single Family Number of Bedrooms:3 Residential / Multi Family Number of Bedrooms: Commercial / Industrial* Type of Use: *These systems require design my a Registered Professional Engineer Type of Water Supply: ''+ Private Well Spring Surface Public If Public Name of Suopliw- Applicant Signature: _ Office Use Only Amount Paid: Receipt #: Check #: Date: Onsite Wastewater Treatment System Design Lot 1, Red Canyon Estates 52 Red Canyon Creek Road Eagle County, Colorado Project No. 13-243 October 28, 2013 Prepared For: Debra Whitman 1001 Crazy Horse Circle Edwards, Colorado 81632 Prepared By: Office Address: 590 Brian Ave., Unit E Silverthorne, Colorado 80497 Mailing Address: P.O. Box 24122 Silverthorne, Colorado 80497 Office: (970)368-6249 Fax: (888)308-4186 www.GoreRangeEngineering.com Page | i G O R E R A N G E E N G I N E E R I N G TABLE OF CONTENTS 1.0 INTRODUCTION AND OVERVIEW .......................................................................... - 1 - 2.0 SITE CONDITIONS ................................................................................................ - 1 - 3.0 SUBSURFACE INVESTIGATION.............................................................................. - 1 - 4.0 PERCOLATION TESTING ....................................................................................... - 1 - 5.0 SOIL ABSORPTION SYSTEM .................................................................................. - 2 - 6.0 OWTS COMPONENTS ............................................................................................ - 2 - 6.1 SEPTIC AND DOSING TANK ........................................................................................ - 2 - 6.2 SEWER PIPE ............................................................................................................ - 3 - 6.3 EFFLUENT TRANSPORT PIPING ................................................................................... - 3 - 7.0 OWTS OPERATION AND MAINTENANCE ................................................................ - 4 - 7.1 OWTS HOUSEHOLD OPERATION ................................................................................. - 4 - 7.2 OWTS MAINTENANCE ................................................................................................ - 4 - 8.0 OWTS CONSTRUCTION OBSERVATION .................................................................. - 5 - 9.0 LIMITATIONS ....................................................................................................... - 5 - FIGURES FIGURE 1 – OWTS SITE PLAN FIGURE 2 – PERCOLATION TEST RESULTS FIGURE 3 – ABSORPTION AREA CALCULATIONS FIGURE 4 – ABSORPTION AREA PLAN VIEW FIGURE 5 – ABSORPTION AREA CROSS SECTION ATTACHMENTS VALLEY PRECAST SEPTIC TANK DETAIL Project No. 13-243 October 28, 2013 Page | - 1 - G O R E R A N G E E N G I N E E R I N G 1.0 INTRODUCTION AND OVERVIEW Gore Range Engineering (GRE) is pleased to submit this Onsite Wastewater Treatment System (OWTS) Design for the proposed three bedroom residence at 52 Red Canyon Creek Road in Eagle County, Colorado. The purpose of this report is to explore the subsurface conditions at the site and provide design details for an OWTS in accordance with current Eagle County Individual Sewage Disposal System (ISDS) Regulations. Our findings and recommendations are presented below. We also performed a Wetland Delineation on the property in the proposed development area. We are preparing a Wetland Delineation Report under a separate cover. 2.0 SITE CONDITIONS The site is currently a vacant lot that is 35.23 acres in size. In the location of the proposed residence and OWTS the ground surface slopes moderately down to the west toward Red Canyon Creek, which flows through the property. To the east of the building site, the ground surface slopes steeply up to the east. Vegetation in the building area consists primarily of sagebrush and grasses. 3.0 SUBSURFACE INVESTIGATION The field exploration for the project was conducted on October 17, 2013. One Profile Pit and three percolation test holes were excavated at the approximate locations shown on Figure 1 to evaluate the subsurface conditions. The pits were excavated with a mini-trackhoe and logged by a representative of GRE. No free water was encountered during excavation and the soils were generally slightly moist to moist. A log of the Profile Pit is provided below. Log of Profile Pit: Elevation = 7,198’ Depth Soils Encountered (USCS symbol) 0-6" TOPSOIL (OL) 6"-9' SAND (SM); silty, gravelly with subangular cobbles up to 8”, medium dense to dense, slightly moist to moist, orange-brown. • Bottom of pit @ 9 feet. • No free water was observed in the pit at the time of excavation. 4.0 PERCOLATION TESTING Percolation tests were performed in three test holes by a representative of GRE on August 17, 2013. The tests were completed at depths of 54 to 69 inches below the adjacent ground surface. Average percolation test results ranged from 8.0 to 16.0 minutes per inch with an average design percolation rate of 13.3 minutes per inch. The percolation test results are presented on Figure 2. The average design percolation rate corresponds to a Long-Term Acceptance Rate of 0.72 gallons per square foot per day. Project No. 13-243 October 28, 2013 Page | - 2 - G O R E R A N G E E N G I N E E R I N G 5.0 SOIL ABSORPTION SYSTEM The recommendations presented below are based on the site conditions encountered and our experience in the area. If conditions encountered during construction are different than those that are described in this report please contact us and we will re-evaluate our recommendations. • The soil absorption system will be 480 square feet and will consist of three trenches with 16 Infiltrator Quick 4 Standard Chambers in each trench. • Each chamber was given 10 square feet of area per Eagle County guidelines. • A 50% reduction in absorption area size was applied for use of chambers in a trench configuration. • Absorption area calculations are presented on Figure 3. • A minimum of 12 inches and a maximum of 48 inches of cover soil should be placed over the chambers. • The trenches will be connected in a serial distribution system. • Backfill should be graded to deflect surface water away from the absorption area and should be sloped at 3H:1V maximum. • Disturbed soil should be re-vegetated immediately with a native grass mix. No trees, shrubs or other plants with deep roots should be planted on or near the absorption area as this may damage piping. • Four inch diameter inspection ports should be installed at each end of each trench. The inspection piping should be installed in the knockouts provided in the chambers. The inspection ports should extend at least 8 inches above the finished ground surface. At least 12, ½ inch holes should be drilled in the above grade portion of the inspection ports for ventilation. • A plan view of the absorption area is presented as Figure 4 and a cross section of the absorption area is presented as Figure 5. 6.0 OWTS COMPONENTS Recommended OWTS components are based on our design details and our experience with the specific component manufacturers. Equivalent components may be used if desired; however, they must meet our minimum recommendations and should be verified by the design engineer. 6.1 SEPTIC AND DOSING TANK • A Valley Precast, 1,000 gallon, two chamber septic is proposed for primary treatment of effluent. An effluent filter should be installed in the tank outlet tee. A septic tank detail is provided as an attachment. • The tank must be set level. The excavation must be free of large rocks or other objects that could damage the tank during placement. A gravel base course may be necessary to prevent tank damage during placement. • Install tanks with 2 feet minimum cover soil or utilize 2 inch thick foam insulation board for frost protection. • Tank installations with 4 feet or more of cover soil over the tank lid should be evaluated by the design engineer and may require reinforced tank lids. Project No. 13-243 October 28, 2013 Page | - 3 - G O R E R A N G E E N G I N E E R I N G • The septic tank lids must extend to within 8 inches of the finished grade; however, we recommend that they be visible from finished grade for ease of access and maintenance. 6.2 SEWER PIPE • The sewer line from the residence to the septic tank should not be less than the diameter of the building drain and not less than 4 inches in diameter. • The sewer pipe should have a rating of SDR35 or better. • Sewer pipe should be sloped at 2% minimum from the residence to the septic tank except for the last 10 feet, which should be sloped at 2% maximum (1% min.) to help limit disturbance of solids in the tank. • 36 inches minimum of cover soil should be provided over the sewer pipe. Paved areas, patios or other areas without vegetative cover may be more susceptible to frost. We recommend 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2 inch thick blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to installation. • The sewer pipe should be bedded in compacted ¾ inch roadbase or native soils provided that the native soils contain no angular rocks or rocks larger than 2½ inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. • Install cleanout pipes within 5 feet of building foundation, where the sewer pipe bends 90 degrees or more and every 100 feet of sewer pipe. • All 90 degree bends should be installed using a 90 degree long-sweep or by using two 45 degree elbows. • The sewer line location shown on Figure 1 is considered conceptual. We assume that there will be only one sewer line exiting the residence. It is the responsibility of the owner to locate all sewer line exit locations and connections to the septic tank. 6.3 EFFLUENT TRANSPORT PIPING • 4 inch diameter SDR 35 effluent transport piping should be sloped at 2% minimum to drain from the septic tank to the first trench. • Serial distribution connections to the lower trenches should also be 4 inch diameter SDR 35 piping sloped at 2% minimum. Serial connections can be made utilizing knockouts provided in the Infiltrator Multiport End Caps. • The effluent transport pipe should be bedded in compacted ¾ inch roadbase or native soils provided that the native soils contain no angular rocks or rocks larger than 2½ inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. • 18 inches minimum of cover soil should be provided over the effluent pipe. Paved areas, patios or other areas without vegetative cover may be more susceptible to frost. We recommend 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2 inch thick blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re-evaluation prior to installation. • All 90 degree bends should be installed using a 90 degree long-sweep or by using two 45 degree elbows. Project No. 13-243 October 28, 2013 Page | - 4 - G O R E R A N G E E N G I N E E R I N G • At minimum, one cleanout should be installed for every 100 feet of non-pressurized effluent transport pipe. 7.0 OWTS OPERATION AND MAINTENANCE The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed and maintained system can greatly increase the lifespan of an OWTS. The level of maintenance will vary with the complexity of the system and water use habits of the residents. GRE recommends that an OWTS Operation and Maintenance (O&M) Manual be developed for the system to ensure that it is properly maintained. Depending on the complexity of the OWTS a contract with an OWTS maintenance provider may also be prudent. Below are some basic recommendations for OWTS O&M. 7.1 OWTS HOUSEHOLD OPERATION • Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS. • Fix plumbing leaks immediately as this may cause a hydraulic overload of the soil absorption system. • Do not irrigate the area on top of or directly upgradient of the soil absorption system as this may cause a hydraulic overload. • Do not dispose of household waste down household drains as this may clog or damage OWTS components. Examples of household waste that should not be disposed of in drains include: dental floss, cotton swabs, coffee grounds, paper towels, feminine products and many other kitchen and bath items. • Use of kitchen garbage disposals is not recommended for households served by an OWTS. If a garbage disposal is utilized, kitchen wastewater should be screened thoroughly. Many kitchen solids are not decomposed in the septic tank and may cause increased pumping frequency to be necessary. • Do not dispose of household chemicals, greases, oils, paints, hot tub water or water softener backwash in household drains. A separate drywell may be necessary for hot tub water or water softener backwash. • Limit the use of bleach as this may harm useful bacteria in the septic tank and soil absorption system. • Liquid dishwasher and clothes washer detergent is recommended for households served by an OWTS. Clay substances used as fillers in powder detergents may result in clogging of the soils absorption system. • The water in septic tanks can freeze during extended periods of non-use. We recommend that second homeowners install a tank heater to help prevent freezing. 7.2 OWTS MAINTENANCE • Inspect the septic tank, effluent filter and soil absorption area at least annually for problems or signs of failure. • The effluent filter should be cleaned annually by spray washing solids into the first chamber of the septic tank. Project No. 13-243 October 28, 2013 Page | - 5 - G O R E R A N G E E N G I N E E R I N G • Septic tank should be pumped and cleaned every 3 to 5 years depending on use. Longer pumping intervals may increase the amount of solids that reach the soil absorption area, which may shorten its life span. • Pumping should take place when the level of the sludge and scum layers combined take up 25- 33% of the capacity of the first chamber of the septic tank. 8.0 OWTS CONSTRUCTION OBSERVATION Eagle County requires that the design engineer perform an As-Built Inspection of the OWTS during construction. All system components (tank, chambers, piping) should be installed, but not backfilled for the inspection. GRE should be notified at least 48 hours prior to inspection. Eagle County should also be notified for inspection. The As-Built Inspection will be billed separately at the time of inspection. 9.0 LIMITATIONS GRE has conducted this study in accordance with generally accepted engineering principles and practices in this area at this time. We make no warranty either expressed or implied. The conclusions and recommendations submitted in this report are based upon the data obtained from the profile pit and percolation test holes, the proposed type of construction and our experience in the area. Variations in the subsurface conditions may not become evident until excavation is performed. If conditions encountered during construction appear different from those described in this report, we should be notified so that re-evaluation of the recommendations may be made. This report has been prepared for the exclusive use by our client for design purposes. We are not responsible for technical interpretations by others of our information. As the project evolves, we should provide continued consultation and field services during construction to review and monitor the implementation of our recommendations, and to verify that the recommendations have been appropriately interpreted. Significant design changes may require additional analysis or modifications to the recommendations presented herein. It is our opinion that the designed location of the OWTS does not violate any setback requirements of the current Eagle County ISDS Regulations of any features that are offsite. Below is a table of common minimum horizontal setbacks to OWTS components. Refer to the Eagle County ISDS Regulations for a complete list of required setbacks. We recommend the OWTS components be surveyed by a Professional Colorado Land Surveyor and verified by GRE prior to permitting. tech HEPWORTH-PAWLAK GEOTECHNICAL May 29, 2014 Debra Whitman 1001 Crazy Horse Circle Edwards, Colorado 81632 Hepworth-Pawlak Geotechnical, Inc. P. O. Drawer 1887 Silverrhome, Colorado 80498 Phone! 970-468-1989 Fax: 970-468.5891 email: hpgeo4@hpgeorech.com Job No. 414 162A Subject: Onsite Wastewater Treatment System Design Review, Lot 19 Red Canyon Estates, 0052 Red Canyon Creek Road, Eagle County, Colorado, Dear Ray: As requested by the Eagle County Environmental Health Department, Hepworth-Pawlak Geotechnical, hic. (HP Geotech) has reviewed the Onsite Wastewater Treatment System (OWTS) Design prepared by Gore Range Engineering dated October 28, 2013, Project No. 13-243. Our findings and recommendations are provided below. Gore Range Engineering. (GRE) ceased conducting business on December 31, 2013. As a Principal Partner in GRE, I have retained all project files in my move to HP Geotech. As the designer of the OWTS for the property, I agree to fulfill the required construction inspection and reporting obligations as required by Eagle County through HP Geotech. Based on our review, the design still meets the requirements of the current Eagle County Environmental Health Department's current Individual Sewage Disposal System Regulations. Any changes to the proposed construction should be reviewed by H-P Geotech and Eagle County. Please feel free to contact us if you have any questions or require additional information. Sincerely, HEPWORTH - PAWLAK GEOTECHNICAL, INC. Jason A. Deem Project Geologist cc: Ray Merry (ray.meny@eaglecounty.us) Dennis Anderson (da@liveinlog.com) Glenwood Springs 970-945-7988 •Parker 303-841-7119 •Colorado Springs 719-633-5562 Ge Ptech HEPWORTH-PAWLAK GEOTECHNICAL Hepworth-Pawlak Georecluiical, Inc. P. Q. Drawer 1887 Silverthurne, Colorado 80498 Phone: 970-468-1989 Fax: 970.468-5891 etnail: hpgeo4@hpgeotech.com ONSITE WASTEWATER TREATMENT SYSTEM DESIGN PROPOSED RESIDENCE LOT 19 RED CANYON ESTATES 52 RED CANYON CREEK ROAD EAGLE COUNTY, COLORADO SEPTEMBER 11, 2014 PREPARED FOR: DEBRA WHITMAN 1001 CRAZY HORSE CIRCLE EDWARDS, COLORADO 81632 Glernvood Springs 970-945-7988 •Parker 303-841-7119 •Colorado Springs 719-633-5562 TABLE OF CONTENTS INTRODUCTION AND OVERVIEW....................................................................... -1- PROPOSED CONSTRUCTION................. sees sees .1- SITE CONDITIONS.................................................................................................... .1- SURFACE WATER AND WETLANDS.................................................................. - 1 - WELLS...............................:......................................................................................-2- SUBSURFACEEXPLORATION............................................................................... . 2 - OWTSANALYSIS....................................................................................................... - 3 - DESIGN RECOMMENDATIONS............................................................................. be 3 - OWTS COMPONENTS........ best *,*best 1** 6604, be*, 6044 ............. 4 - Septicand Dose Tank................................................................................................ - 4 - SewerPipe................................................................................................................. be 5 - EffluentTransport Piping.......................................................................................... - 6 - Soil Treatment Area Distribution Piping................................................................... - 6 - EffluentPumping System.......................................................................................... - 7 - Automatic Distributing Valve.................................................................................... - 8 - OWTS OPERATION AND MAINTENANCE......................................................... - 8 - OWTS HOUSEHOLD OPERATION....................................................................... - 8 - OWTS MAINTENANCE.......................................................................................... - 9 - OWTS CONSTRUCTION OBSERVATION.......................................................... -10 - LIMITATIONS.......................................................................................................... -10 - FIGURES FIGURE I — OWTS SITE PLAN FIGURE 2 — HYDROMETER AND SIEVE ANALYSIS FIGURE 3 — SOIL TREATMENT AREA CALCULATIONS FIGURE 4 — SOIL TREATMENT AREA PLAN VIEW FIGURE 5 — SOIL TREATMENT AREA CROSS SECTION FIGURE 6 — DISTRIBUTION LINE CLEANOUT DETAIL ATTACHMENTS FRONT RANGE PRECAST SEPTIC TANK DETAIL GOULDS PE51 PUMP PERFORMANCE CURVE INTRODUCTION AND OVERVIEW This report provides the results of an onsite wastewater treatment system kOWTS) design for the proposed residence at 52 Red Canyon Creek Road in Eagle County, Colorado. The purpose of this report was to explore the subsurface conditions at the site and provide design details for an OWTS in accordance with the 2014 Eagle County Onsite Wastewater Treatment System Regulations and the Colorado Department of Public Health and Environment's Regulation #43. The results of our subsurface exploration and design recommendations are provided below. PROPOSED CONSTRUCTION The owners are planning to construct a three bedroom residence on the property. A future riding arena with an accessory dwelling unit is also proposed. The OWTS was designed for a total of four bedrooms. The proposed residence and location of the future riding arena is shown on Figure 1. SITE CONDITIONS The lot was vacant at the time of our field exploration. The terrain in the area of the proposed soil treatment area is moderately to steeply sloped down to the west. Vegetation consisted of grasses, weeds and sagebrush. SURFACE WATER AND WETLANDS Red Canyon Creek flows tluough the property from the north to south. There are wetlands adjacent to the creek as wells as a small pocket of wetlands between the creek and the proposed soil treatment area. A 50 feet setback is required from any surface water or wetlands to the soil treatment area, septic tank, sewer line and effluent lines. We were unable to maintain the setback from the wetland boundary to the effluent line from the tank to the soil treatment area. Encroachments of the sewer line and effluent line Job No. 414 162A Ge�eCh setback are allowed if the pipe is double encased per Note 2 of Regulation 443 which states: "Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater conveyance pipe is encased for the minimum setback distance on each side of the crossing. A length ofpipe shall be used with a minimum Schedule 40 rating ofsufficient diameter to easily slide over and completely encase the conveyance. Rigid end caps of at least Schedule 40 rating must be glued or secured in a watertightfashion to the ends of the encasement pipe. A hole ofsufcient size to accommodate the pipe shall be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of the encasement pipe. The area in which the pipe passes through the end caps shall be sealed with an approved underground sealant compatible with the piping used. " WELLS The proposed well location is shown on Figure 1. A 100 feet setback is required from the soil treatment area to wells. A 50 feet setback is required from wells to sewer lines, effluent lines and septic tanks. SUBSURFACEI;XPLORATION The field exploration for the project was conducted by HP Geotech on July 2, 2014. Two Profile Pits (Profile Pits 1 and 2) were excavated to evaluate the subsurface conditions. Logs of the Profile Pits are provided below. The soils encountered consisted of 6 inches of topsoil overlying weak -blocky silt loam with gravel to the maximum depth explored, 9 feet. Based on the soil test pit evaluations, the infiltrative surface of the soil treatment area will be located in weak -blocky silt loam soil. The loam soils classify as a Soil Type 2A based Regulation #43. A hydrometer and gradation analysis was performed on a sample of the soils at the infiltrative surface. A copy of the gradation test results are provided as Figure 2. Job No. 414 162A h -3- Log of Profile Pit 1 Depth USDA Classification 0-6" TOPSOIL; organic silty, sandy, loose, slightly moist, brown. 6"-9' SILT LOAM; with gravel, blocky shape, weak grade, stiff, moist, brown. • Bottom ofpit @ 9 feet. • No free water was encountered during excavation. Log of Profile Pit 2 Depth USDA Classification 0-6" TOPSOIL; organic silty, sandy, loose, slightly moist, brown. 6"-8' SILT LOAM; with gravel, blocky shape, weak grade, stiff, moist brown. • Bottom ofpit @ 9 feet. • No free water was encountered during excavation. OWTS ANALYSIS Based on the soil conditions encountered; a below grade Infilhator chamber trench system will be used at the site. Sewage will be collected in the septic tank and gravity flow to a dosing chamber where it will be pumped to the soil treatment area. Equal distribution will be provided by an automatic distributing valve. DESIGN RECOMMENDATIONS The recommendations presented below are based on the site and subsurface conditions encountered and our experience in the area. If conditions encountered during construction are different than those that are described in this report please contact us and we will re-evaluate our recommendations. SOIL TREATMENT AREA • The soil treatment system will consist of five trenches containing 12 Infilhator Quick 4 Plus Standard chambers in each trench (60 chambers total). Job No. 414 162A G�ach -4- • A 20% reduction was applied for pressure distribution and an addition 30% reduction was applied for use of chambers. Each chamber was given 12 square feet of absorption area. Soil treatment area calculations are presented on Figure 3. • A minimum of 12 inches and a maximum of 36 inches of cover soil should be placed over the chambers. • Concrete sand may be used as a leveling course beneath the chambers if necessary. • Backfill should be graded to deflect surface water away from the absorption area and should be sloped at 3H:1V maximum. • Disturbed soil should be re -vegetated immediately with a native grass mix. No trees, shrubs or other plants with deep roots should be planted on or near the absorption area as this may damage piping. • Four inch diameter inspection ports should be installed at both ends of each trench. The inspection port piping should be placed in the knockouts provided in the chamber end plates. The inspection ports should extent at least 8 inches above the finished ground surface or be protected in a valve box at finished grade. • A plan view of the absorption area is presented as Figure 4 and a cross section of the absorption area is presented as Figure 5. OWTS COMPONENTS Recommended OWTS components were based on our design details and our experience with the specific component manufacturers. Equivalent components may be used if desired; however, they must meet our minimum recommendations and should be verified by the design engineer. Septic and Dose Tanlc • A 2,000 gallon, three chamber Front Range Precast septic tank is proposed for treatment of sewage from the residence. An effluent pump will be installed in the third chamber of the tank. Pump specifications are provided in the Effluent Pumping System section of this report. A copy of the tank detail is attached to this report after the figures. Job No. 414 162A Ge�itech -5- • An effluent filter should be installed in the tee between the second and third chambers of the tank. A tee handle should be installed on the filter and extend to within 6 inches of the tank lid. • The tank must be set level. The excavation must be free of large rocks or other objects that could damage the tank during placement. A gravel base course bedding material may be necessary to prevent tank damage during placement. • Install tanks with 2 feet minimum cover soil for frost protection. Maximum tank burial depth is 4 feet. • The septic and dose chamber lids must extend to finished grade. Sewer Pipe • The sewer line from the existing residence to the septic tank should not be less than the diameter of the building drain and not less than 4 inches in diameter. • The sewer pipe should have a rating of SDR35 or better. • Sewer pipe should be sloped at 2% minimum from the residence to the septic tank except for the last 10 feet, which should be sloped at 4% maximum 0% minimum) to help limit disturbance of solids in the tank. • 36 inches minimum of cover soil should be provided over the sewer pipe. Paved areas, patios or other areas without vegetative cover may be more susceptible to frost. We recommend 48 inches of soil cover over the sewer pipe in these areas and the pipe be insulated on top and sides with 2 inch thick blue foam insulation board. If adequate soil cover is not possible, we should be contacted for re- evaluation prior to installation. • The sewer pipe should be bedded in compacted'/4 inch road base or native soils provided that the native soils contain no angular rocks or rocks larger than 2'/z inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. • Install cleanout pipes within 5 feet of building foundation, where the sewer pipe bends 90 degrees or more and every 100 feet of sewer pipe. • A1190 degree bends should be installed using a 90 degree long -sweep or by using two 45 degree elbows. Job No. 414 162A Gec�teCh -6- • The sewer line locations shown on Figure 1 are considered conceptual. We assume that there will be only one sewer line exiting the existing residence and one sewer line exiting the fixture riding arena. It is the responsibility of the owner to locate all sewer line exit locations and connections to the septic tank. Effluent Transport Piping • 1.25 inch diameter Schedule 40 effluent transport piping should be sloped at 2% minimum to drain from the automatic distributing valve (ADV) back to the dose chamber and from the ADV to the treatment area after each pumping cycle. The ADV must be the high point of the system. • The effluent transport pipe should be bedded in compacted'/4 inch road base or native soils provided that the native soils contain no angular rocks or rocks larger than 2%2 inches in diameter to help prevent settlement of the pipe. Sags could cause standing effluent to freeze and damage piping. • 18 inches minimum of cover soil should be provided over the effluent transport pipe. Paved areas, patios or other areas without vegetative cover may be more susceptible to frost. We recommend 48 inches of soil cover over the sewer pipe in these areas. If adequate cover soil is not possible the effluent pipe should be insulated on top and sides with 2 inch thick foam insulation board and the design engineer should re-evaluate soil cover prior to installation. • The effluent pipe should be double encased with larger diameter Schedule 40 PVC pipe underneath driveway surfaces and be provided with at least 48 inches of soil cover and be insulated on top and sides with 2 inch thick foam insulation board. • A1190 degree bends should be installed using a 90 degree long -sweep or by using two 45 degree elbows. Soil Treatment Area Distribution Piping • 1.25 inch diameter Schedule 40 distribution piping will be hung level inside of the chambers. • The piping should be secured with 120 pound minimum tensile strength plastic zip ties. Use at least one zip tie per chamber. Job No. 414 162A -7- • 5/32 inch diameter perforations should be drilled on top of the distribution piping. One perforation should be placed near the center of each of the 12 chambers. • Drill one additional 5/32 inch hole at each end of each lateral on the bottom of the pipes to allow for drainage. Place a splash block beneath the downward facing holes to protect from scouring. Effluent Pumping System • A Goulds PE51, 115 volt, submersible effluent pump with a 1.5 inch diameter discharge assembly, or equivalent, will be required for effluent pumping. • The maximum effluent transport distance from the pump discharge to the ADV is estimated to be 150 feet and an additiona142 feet after the ADV to the field. • The elevation difference from pump discharge to the dose tank is estimated to be 20 feet. • An equivalent pump must be capable of operating at 10.2 gallons per minute at 32.6 feet of total dynamic head. A pump performance curve is provided as an attachment to this report. The floats should be set to provide a dose volume of approximately 90 gallons. The actual dose volume will be approximately 79 gallons assuming an effluent drainback volume of 11 gallons in the transport piping. To achieve the desired dose volume the upper ("ON") and lower ("OFF") floats should be set approximately 8'/4 inches apart. • The high water alarm float should be placed approximately 3 inches above the "ON" float in the dose tank. • A %e inch diameter weep hole should be drilled in the effluent transport line prior to exiting the dose chamber so the transport line can drain after each pumping cycle. • The flow differential between the first and last orifices in each trench has been calculated to be approximately 2.4%. • Cleanouts must be installed at the end of each distribution line. A cleanout detail is provided as Figure 6. Job No. 414 162A Ge�itech -8- Automatic Distributing Valve • An Orenco V6605 Automatic Distributing Valve (ADV) will be used to alternate doses to each of the trenches. • The ADV must be installed level and must be the high point in the system. • The ADV should be installed in a sprinkler box, or equivalent, such that it is serviceable and protected fiom freezing. We recommend the ADV be equipped with heat tape for additional frost protection during winter months. • We recommend the ground surface be graded away from the ADV in all directions. Improper surface drainage could cause standing water to freeze and damage the valve and/or piping. • The valve has clear sections of pipe that should be inspected at least annually to ensure that it is alternating doses to each trench. OWTS OPERATION AND MAINTENANCE The OWTS will require periodic inspection and maintenance to function properly. A properly designed, installed and maintained system can greatly increase the lifespan of the system. The level of maintenance will vary with the complexity of the system and water use habits of the residents. We recommend that an OWTS Operation and Maintenance (O&M) Manual be developed for the system to ensure that it is properly maintained. Depending on the complexity of the system a contract with an OWTS maintenance provider may also be prudent. Below are some basic recommendations for OWTS O&M. CYii:IIKY.l;�111.�[�I�YZYI�d 7�Y[YLI • Use of high efficiency water fixtures is recommended to decrease the hydraulic load on the OWTS. • Fix plumbing leaks immediately as this may cause a hydraulic overload of the soil absorption system. • Do not irrigate the area on top of or directly upgradient of the soil absorption system as this may cause a hydraulic overload. Job No.414 ]62A Ge�tecFt -9- • Do not dispose of household waste down household drains as this may clog or damage OWTS components. Examples of household waste that should not be disposed of in drains include: dental floss, cotton swabs, coffee grounds, paper towels, feminine products and many other kitchen and bath items. • Use of kitchen garbage disposals is not recommended for households served by an OWTS. If a garbage disposal is utilized, kitchen wastewater should be screened thoroughly. Many kitchen solids are not decomposed in the septic tank and may cause increased pumping frequency. • Do not dispose of household chemicals, greases, oils, paints, hot tub water or water softener backwash in household drains. A separate drywell, if feasible, may be necessary for hot tub water or water softener backwash disposal. • Limit the use of bleach as this may harm useful bacteria in the septic tank and soil absorption system. • Liquid dishwasher and clothes washer detergent is recommended for households served by an OWTS. Clay substances used as fillers in powder detergents may result in clogging of the soils absorption system. • The water in septic tanks can fieeze during extended periods of non-use. We recommend that second homeowners install a tank heater to help prevent freezing. OWTS MAINTENANCE • Inspect the septic tank, effluent filter, ADV and soil heatment area at least annually for problems or signs of failure. • The effluent filter should be cleaned annually by spray washing solids into the fi rst chamber of the septic tank. • Septic tank should be pumped and cleaned every 3 to 5 years depending on use. Longer pumping intervals may increase the amount of solids that reach the soil absorption area, which may shorten its We span. • Pumping should take place when the level of the sludge and scum layers combined take up 25 to 33% of the capacity of the first chamber of the septic tank. Job No. 414 162A Get�6eCh lo- OWTS CONSTRUCTION OBSERVATION The Eagle County Environmental Health Department requires that the designer provide an as -built certification of the OWTS construction. HP Geotech should be provided with at least 48 hour notice prior to the installer needing inspection. Prior to issuance of our certification letter, we require observation of all system components prior to backfill. Number of visits required will be dependent on the installer's construction schedule. LIMITATIONS We have conducted this study in accordance with generally accepted engineering principles and practices in this area at this time. We make no warranty either expressed or implied. The conclusions and recommendations submitted in this report are based upon the data obtained from the profile pits, percolation test results, soil texture analysis, subsurface conditions encountered, the proposed type of construction and our experience in the area. Variations in the subsurface conditions may not become evident until excavation is performed. If conditions encountered during construction appear different from those described in this report, we should be notified so that re-evaluation of the recommendations may be made. This report has been prepared for the exclusive use by our client for design purposes. We are not responsible for technical interpretations by others of our information. As the project evolves, we should provide continued consultation and field services during construction to review and monitor the implementation of our recommendations, and to verify that the recommendations have been appropriately interpreted. Significant design changes may require additional analysis or modifications to the recommendations presented herein. It is our opinion that the designed location of the OWTS does not violate any setback requirements of the current Eagle County Regulations. Below is a table of common minimum horizontal setbacks to OWTS components. Refer to the Eagle County lob No. 414 162A h Regulations for a complete list of required setbacks. We recommend the OWTS components be surveyed by a Professional Colorado Land Surveyor and verified by HP Geotech prior to permitting. Table 1 -Common Minimum Horizontal Setbacks from OWTS Components Water Lined Lake, Dry Wells Supply Occupied Ditch Irrigation Ditch Septic Line Dwelling or Ditch, or Tank Lake Stream Gulch Absorption 100' 25' 20' 20' 50' 25' 5' Area Septic 50' 10, 5' 10, 50' 10' Tank Building 503 10' 0' 10' 50' 10' Sewer Please contact us for any necessary revisions or discussion after review of this report by Eagle County. If you have any questions, or if we may be of further assistance, please let us know. Sincerely, HEPWORTH-PAWLAK GEOTECHNICAL, INC. I \ ` -- Jason A. Deem Project Geologist Reviewed by: Chad M. Bringle, P.E, Project Engineer Job No. 414 162A ��h Of t of /� /�-___.._- /OODEN HED /If Ifif /it p.1 If r I EFFLUENT TRANSPORT PIPE MUST BE ENCASED WI LARGER DIAMETER SCH. 40 PVC PER TABLE 7.1 OF CDPHE REG. `I 431 NOTE 2 WITHIN 50' OF WETLANDS- ]jl WETLAND p �\ BOUNDARY PER IIItIPT21 / V GRE REPORT /DATED11-08-13 I'- 1 I 1 , 1 I' Lr APPROXIMATE SCALE: 1 INCH = 40 FEET 414162A PROPOSED JTURE RIDING ARENA AND ACCESORY/ DWELLING d dl Ili PROPERTY BOUNDAq CLEANOUT ' if f FRONT RANGEPRECAST 2,000 GALLON, THREE CHAMBER SEPTIC TANK EQUIPPED WITH AN GOULDS PE51 EFFLUENT PUMP IN THE THIRD CHAMBER, ALL EFFLUENT FILTER IN SECOND CHAMBER OUTLET TEE. 1 �� CLEANOUT ` ,ORENCO V6605 AUTOMATIC -DISTRIBUTING VALVE ROPOSED SOIL TREATMENT REA CONSISTING OF FNE OWS OF 121NFILTRATOR QUICK STANDARD CHAMBERS(60 HAMBERS TOTAL) LOT 1, RED CANYON ESTATES OWTS SITE PLAN FIGURE 1 Pif =Septic Depth =2'-4' Percent Passing #10 Sieve = 63%* Assumed Specific Gravity = 2.65 Classification: Silt Loam Sieve Size /Particle Diameter Percent Passing 1" 100 (3/461)100 (1/2") 100 31811 100 #4 100 (#10) 100 #16 99 #30) 97 #50 95 (#100) 91 #200 77 0.037 36 0.032 36 0.023 35 0.016 35 0.009 29 0.005 24 0.001 15 analysis performed on sample passing the #10 sieve. Particle Size Distribution Sand 23% Silt 62% Clay 15% ClrC�iE:I:�1 FIGURE 2 SOIL TREATMENT AREA CALCULATIONS In accordance with the 2014 Eagle County OWTS Regulations the treatment area was calculated as follows: i l ;CALCULATION OF OWTS DESIGN FLOW: j I I Q = ff)(B)(N) WHERE: ]Q = DESIGN FLOW F = AVERAGE FLOW PER PERSON PER DAY l _B = NUMBER OF BEDROOMS !N = NUMBER OF F PERSONS PER BEDROOM IF = IB IN = IQ= MUM ABSORPTION AREA AGGREGATE = Q +LTAR WHERE: Q= SILT LOAM LTAR = MINIMUM SOIL TREATMENT AREA = SIZE ADJUSTMENT FOR PRESSURE DOSING = ADJUSTMENT FOR CHAMBERS = 'MINIMUM AREA AFTER REDUCTION = NUMBER OF TRENCHES = NUMBER OF CHAMBERS PER TRENCH = SOIL TREATMENT AREA PER CHAMBER = ACTUAL SOIL TREATMENT AREA = 414 162A HEPWORTH-PAWLAK 75GALLONS PER DAY +BEDROOMS 2'PERSONS PER BEDROOM 600 GALLONS PER DAY 600'GALLONS PER DAY 0,5'GALLONS PER SQUARE FOOT PER DAY 1200.0 SQUARE FEET O.BI OJ' 672.0 5 121 121,SQUARE FEET 720.0'SQUARE FEET LOT 1, RED CANYON ESTATES SOIL TREATMENT AREA CALCULATIONS FIGURE 3 1.25° solid Sch. 40 PVC Orerice V6605 Automatic Distributing Valve, MUST BE HIGH POINT OF SYSTEM. p to drain back to dose Line Flow From Tank chamber after each pump cycle Infiltrator Quick 4 Plus Standard End Plate Glue solid end caps at ends of distribution laterals. 1.25" solid Sch. 40 PVC pipe sloped at 2% min, to in to each trench 4 inch diameter inspection port installed vertically into knockouts provided in end caps. Install vents at each end of each trench. Removable lid to be placed on top of pipe. Pipe must stick up at least 8 inches above finished grade or be installed at grade in a valve box. 1.25° perforated Sch. 40 PVC. Pipe should be hung level inside chambers with 120 Ib, tensile strength zip ties at each end of each chamber. Drill a single 32° hole on top of pipe in center of each chamber. Drill additional 32 hole at each end of each lateral on bottom of pipe to allow for drainage. Install splash blocks beneath holes pointing downward. Infiltrator Quick 4 Plus Standard Chambers. Twelve chambers per trench. Notes: 1. Chambers should be installed level on a scarified ground surface. NOT TO SCALE 2. All piping should have a rating of Schedule 40 PVC. 3. Changes to this design should not be made without consultation and approval by HP Gectech, H LOT 1, RED CANYON ESTATES 414 162A GeUtech SOIL TREATMENT AREA PLAN VIEW FIGURE 4 HEPWORiH-PAWLAK GEOIECHNICAL Infiltrator Quick 4 Plus Standard End Cap Infiltrator Quick Standard Chamber 124 min. 36' max. Cover Install Level Soil III tl Deflect Surface ce Water il' _7I Pressure Pipe Cutout Location nn.�. it _ I I''{IF I �- ll"'ll llt�l�� l♦�llf01, �ti- ll- I Notes: 1. Chambers should be installed level on a scarified ground surface. 2. Care should be taken by the contractor to avoid compaction of the native soils in the trench areas. 3. Install 3-& of concrete sand beneath chambers for leveling if necessary. 4. Changes to this design should not be made Without consultation and approval by HP Geotech. APPROXIMATE SCALE: 1 INCH = 6 FEET 414 162A Ge %+I LOT 1, RED CANYON ESTATES FIGURE 5 HEPWORTH—PAWLAK GEOIECHNICAL SOIL TREATMENT AREA CROSS SECTION Install 6" valve box al. ground surface Ground Surface Backfill valve box to bottom of cap with onsite soil Insulate Lid with 2" blue board 1.25" Sch. 40, threaded cap 1.25" Sch. 40, 90° long -sweep Notes: 1. All piping, fittings and valves should be Sch. 40 PVC. APPROXIMATE SCALE: 2. Install distribution line cleanouts at the end of each distribution line. 1 INCH = 2 FEET H 14 162A Geh LOT 1, RED CANYON ESTATES 4eUtcDISTRIBUTION LINE CLEANOUT DETAIL FIGURE 6 HEPWORTH-PAWLAK GEOTECHNICAL kAech HEPWORTH-PAWLAK GEOTECHNICAL October 28, 2015 HepworthTawlak Geotechnical, Inc. P. O. Drawer 1887 Silverthorne, Colorado 80498 Phone: 9704684989 Fax:970-468-5891 email: hpgeo4@hpgeotech.com Debra Whitman 1001 Crazy Horse Circle Edwards, Colorado 81632 Job No. 414 162A Subject: As -Built Evaluation of Onsite Wastewater Treatment System, Proposed Residence, 52 Red Canyon Creek Road, Lot 1, Red Canyon Estates, Eagle County, Colorado. Dear Ms. Whitman: Hepworth-Pawlak Geotechnical, Inc. (HP Geotech) observed the installation of the Onsite Wastewater Treatment System (OWTS) for the proposed residence at the subject property. The OWTS components observed include: sewer pipe, cleanout, septic tank, pump and pump operation, effluent transport pipe, soil treatment area, automatic distribution valve (ADV), cleanouts, inspection ports and the locations of components. We previously designed an OWTS for the subject site and presented our recommendations in a report dated September 11, 2014 under the same job number. Our observations and recommendations are presented in the following paragraphs. We performed our As -Built site evaluation on November 6t" and December 19t", 2014 and we performed a pump operation and ADV test on October 3ra, 2015. The installation, operation and locations of system components were verified as shown on Figure 1. During our initial site inspection we observed several deficiencies with the installation requiring an additional site visit. The deficiencies included: incorrect size of effluent transport piping, improper slope on effluent transport piping, incorrect installation of ADV, incorrect number of Infiltrator chambers and no distribution piping to ends of trenches. The contractor had corrected the problems during our December 10, 2014 site visit. The septic tank and effluent transport piping were moved uphill slightly to accommodate the required 50 feet setback to wetlands, which eliminated the need for pipe encasement as stated in our design. The wetland setback was verified during our site inspection. Photographs of the OWTS installation are provided in the attached Photograph Log. Glenwood Springs 970-945-7988 •Parker 303-841-7119 •Colorado Springs 719-633-5562 Debra Whitman October 28, 2015 Page 2 It is our opinion that the OWTS was installed in general conformance with our September 11, 2014 design. The observations and recommendations presented above are based on our site observations and our experience in the area. We make no warranty either express or implied. Alterations to the system or improper backfill and site grading could affect the operation and effectiveness of the OWTS. Please feel free to contact us if you have any questions regarding this letter. Sincerely, HEPWORTH - PAWLAK GEOTECHMCAL, INC. Jason A. Deem Project Geologist Chad M. Bringle, P.E. Project Engineer �. �,� 1 A . �•� 1153 •. lo- Z8 45 ZONAL E Attachments: Figure 1 — OWTS As -Built Plan OWTS As -Built Photograph Log cc: Terri Vroman, Eagle County Environmental Health Department John Kennedy, Jeremiah Johnson Log Homes ,lob No. 414 162A / / / / WETLAND BOUNDARY PER GRE REPORT DATED 11-08-13 1 I j APPROXIMATE SCALE: 1 INCH = 40 FEET 1 ; 11 1 1 1 1 1! i f PROPERTY BOUNDARY ` r l� V RESIDEN I v _ y ` �• CLEANOUT le !, 1 / ! i� it + rlrrii `irr FRONT RANGE PRECAST 2,000 GALLON, THREE CHAMBER T SEPTIC TANK EQUIPPED WITH AN J GOULDS PE51 EFFLUENT PUMP IN THE THIRD CHAMBER. i INSTALL EFFLUENT FILTER IN SECOND CHAMBER OUTLET TEE. i i i/ z l;1 j I r ���ORENCO V6605 AUTOMATIC i� ++ DISTRIBUTING VALVE It r ; SOIL TREATMENT AREA CONSISTING OF FIVE ROWS OF '12 INFILTRATOR QUICK 4 STANDARD CHAMBERS (60 CHAMBERS TOTAL) 414162A Ge Ptech LOT 11 RED CANYON ESTATES FIGURE 1 HEPWORTH-PAWLAKGEOTECHNICAL OWTS AS -BUILT 01TE PLAN LOT 19 RED CANYON ESTATES OWTS AS -BUILT PHOTOGRAPH LOG a - %kr%� - View of effluent transport piping from tank to automatic distributing valve. View of soil treatment area trenches during installation. Job No. 414 162A J AV l J f - �1 y., Y • A,aMlu E j � �•., Mth i r � !` r LOT 1, RED CANYON ESTATES OWTS AS -BUILT PHOTOGRAPH LOG View from soil treatment area looking north at automatic distributing valve. Job No. 414 162A HEPWORTH-PAWLAK GEOTECHNICAL, INC. P.O. Drawer 1887 240 Annie Road Silverthorne, CO 80498 Phone: 970468-1989 Wx Fax: 'if 70-468-5891 Debra Whitman 1001 Crazy Horse Circle Edwards, CO 81632 Invoice •r Professional Lot 1, Red Canyon Estates Professional Services: DATE TASK DESCRIPTION Page: 1 Invoice Number: 0404052 Invoice Date : 10/28/2015 .lob Number : 414162A Project Manager : ,JAD Project : Lot 11 Red Canyon Estates 52 Red Canyon Creek Road Eagle County PAYMENT TERMS -DUE UPON RECEIPT WE NOW ACCEPT VISA 8MASTERCARD PLEASE INCLUDE INVOICE NUMBER ON CHECK 10/28/2015 /LS4 Lump Sum As -Built Evaluation of Onsite Wastewater TreatmentSystem YOU. WE APPRECIATE YOUR BUSINESS. THANK UNITS Please Remit Payment to Corporate Office: HP Geotech 5020 County Road 154 Glenwood Springs, CO 81601 RATE AMOUNT 1.00 $ 975.00 $ 975.00 Invoice Total: $ 975.00 Invoice Total: $ 975.00 PLEASE INCLUDE INVOICE NUMBER ON CHECK - 0404052 PLEASE Fed TaX ID: 84-1228299 PAY FROM THIS INVOICE. Late fee of $30.00 or 1.5% per month (whichever is greater) will be charged 30 days from the invoice date.