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HomeMy WebLinkAbout967 Gray Rock - 210935103001Environmental Health Department P.O. Box 179 500 Broadway Eagle, CO 81631-0179 Phone: (970) 328-8730 Fax: (970) 328-7185 Permit Permit No. OWTS-021344-2021 Permit Type: OWTS Permit Work Classification: New Permit Status: Expired Issue Date: 5/11/2021 Expires: 9/8/2021 On-Site Wastewater Treatement System Project Address Parcel Number 967 GRAY ROCK DR, EAGLE AREA,210935103001 Owner Information Address Steven Gomez Phone: Cell: (303) 656-8237 Email: svgdendiego@yahoo.com Inspections: For Inspections Call: (970) 328-8755 Engineer Phone Email JVA Inc, Simon Farrell (303) 444-1951 sfarrell@jvajva.com Contractor License Number Phone Email Defina Construction, INC gary@definaconstruction. com (970) 376-6702OWTSPL-000140-20 21 Permitted Construction / Details: Install the OWTS exactly as depicted in the JVA, Inc. design, signed, stamped and dated October 14th, 2021 by Simon A. Farrell, PE. The OWTS is designed with capacity to serve both the single family residence and the detached ADU, for a total of five bedrooms. The system consists of two sewer lines, one from the residence and one from the ADU. A Valley Precast 1,500 gallon, single compartment tank with effluent filter and high water alarm placed on the outlet tee, followed by a 2,000 gallon Valley Precast three-compartment recirculating/dose tank which will send wastewater to two, Orenco Advantex Series AX 20 pods for nitrification using an Orenco PF 500512 pump. Nitrified effluent flows to the splitter valve for recirculation to the 1,500 gallon first tank for denitrification then is dosed using an Orenco PF 501512 pump to 3,072 square feet of soil treatment area via four beds consisting of four rows of 16 Infiltrator Quick 4 Plus Standard chambers for a total of 256 Infiltrator chambers. Distribution lateral details, along with orifice size, spacing and orientation are on the design drawing. The contractor must verify that all electrical components and inspections are covered under the electrical permit associated with the Orenco Vericom control panel (Model VCOM-AX20B2) and pump connections. The alarm must be connected to a separate circuit. Additional pump details are on the design drawing. Advantex systems must conform to the CDPHE technology approval letter dated May 1, 2018, including configuration in mode 3 for treatment level 3N. Contact Eagle County Environmental Health and the design engineer well in advance of requesting inspections prior to backfilling any component of the OWTS. The design engineer is responsible for conducting all inspections necessary to certify the installation and assure the functionality of the system. System certification, along with photos and a record drawing is required to be submitted to and approved by Eagle County Environmental Health prior to the use of the system. Tuesday, November 9, 2021 1 THIS PERIMT 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 Issued by: Environmental Health Department, Eagle County, CO Claire Lewandowski Date May 11, 2021 CONDITIONS 1. 2.ALL INSTALLATIONS MUST COMPLY WITH ALL REQUIREMENTS OF THE EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS ADOPTED PURSUANT TO AUTHORITY GRANTED IN CR.S. 25-10-101, et seq., AS AMENDED 3.THIS PERMIT IS VALID ONLY FOR PERFORMING WORK ON OWTS ASSOCIATED WITH 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 PERMIT4.1.6(A)(1) EAGLE COUNTY PUBLIC HEALTH AGENCY ON-SITE WASTEWATER TREATMENT SYSTEM REGULATIONS REQUIRES ANY PERSON WHO CONSTRUCTS, ALTERS OR INSTALLS AN ON-SITE WASTEWATER TREATMENT SYSTEM TO BE LICENSED Tuesday, November 9, 2021 2 March 24, 2021 Ms. Claire Lewandowski, REHS Eagle County Environmental Health 590 Broadway Eagle, CO 81631 RE: Frost Creek - Onsite Wastewater Treatment System Design – Lot 28, Eagle County, CO Dear Claire: JVA Inc. (JVA) has prepared a design of an onsite wastewater treatment system (OWTS) to serve Lot 28 within the Frost Creek PUD. JVA is the designated engineer to process all OWTS permit applications within Frost Creek. JVA has prepared the OWTS design to be in general conformance with OWTS requirements of the PUD. The 2020 annual Water Quality Monitoring Report prepared by Wright Water Engineers documents exceedances of the 85th percentile background concentrations during sampling events in 2020. The report states the following ‘While the concentrations observed in 2020 were high for Total Phosphorus and Total Suspended Solids in surface water, upon evaluation of the pattern of concentrations of each water quality parameter for surface and groundwater at the Frost Creek PUD, there are no evident increasing trends in the concentration of the sampled parameters that were outside of the range of historical values. Therefore, all three components of the trigger limits have not yet been met, and mitigation action is not yet required.’ Sincerely, JVA, INCORPORATED By: _______________________ Simon Farrell, P.E. Project Manager, Associate Attachment A - OWTS design – Lot 28 Attachment B - Visual and Tactile Soil Evaluation Attachment C - Discharge pump calculations ATTACHMENT A – OWTS DESIGN – LOT 28 ATTACHMENT B – VISUAL AND TACTILE SOIL EVALUATION March 24, 2021 Ms. Claire Lewandowski, REHS Eagle County Environmental Health 590 Broadway Eagle, CO 81631 RE: Frost Creek Lot 28 – Site and Soil Investigation for an Onsite Wastewater Treatment System (OWTS) JVA Job No. 1037.25e Dear Claire: Enclosed in this report are the results of the site and soil evaluation for Lot 28’s proposed OWTS located in Frost Creek, Colorado. This report provides information needed to support the design of an OWTS including: results from the preliminary investigation, the site visit, and the soil evaluation. Design calculations are included in the drawing Permit Set attached. PRELIMINARY INVESTIGATION In preparation for the site visit and soil evaluation, a preliminary investigation was conducted the week of October 28, 2020. Architectural site plans, aerial imagery, and previous geotechnical investigations were used for the preliminary investigation. Geotechnical investigations were performed by HP Geotech in October 2002 across Frost Creek for OWTS suitability. Results from the HP Geotech report showed that for the proposed location, Test Hole A and Test Hole B had a topsoil from zero to six inches deep, a gravelly sandy clay from six inches to eight feet deep. No groundwater was encountered in either test hole. SITE VISIT AND SOIL EVALUATION A site visit and soil evaluation were conducted the week of November 4, 2020. The purpose of the site visit and soil evaluation was to confirm hypotheses from the preliminary investigation, identify the topography, landscape position, vegetation, and site constraints for the proposed OWTS, and to conduct a visual and tactile soil evaluation of the underlying soils where the proposed soil treatment area (STA) is to be located for both suitability and sizing. The topography of the site slopes from west to east. The dominant vegetation at the proposed OWTS consists of native grasses and sage brush. Site Constraints are shown in the Permit Documents. For the visual and tactile soil evaluation, two soil profile holes were excavated using a tracked excavator in the locations identified in the Permit Documents. As seen in Table 1 below, soil morphology for Soil Profile Hole One from zero to six inches was loam topsoil, from six inches to six feet was a rocky sandy clay loam, and from six feet on was bedrock. Soil morphology for Soil Profile Hole Two was similar to Soil Profile Hole One with loam topsoil from zero to two feet, from two feet to five and a half feet was a rocky sandy clay loam, and from five and a half feet on was bedrock. No redoximorphic features, indicating seasonally high groundwater, were observed in either hole. Figures 1 through 4 below show the soil profile holes and corresponding Frost Creek Lot 28 Site and Soil Investigation 3/24/21 2 of 3 morphology. Therefore, R-2, Type 3 was identified as the soil type. The proposed STA will be a bed designed using an LTAR of 0.35. Table 1 – Visual and Tactile Soil Results Profile Hole Depth (ft.) Percent Rock Soil Texture Soil Structure Type Soil Structure Grade Soil Type 1 0 – 0.5 0% retained on 20 mm sieve 5% retained on 2 mm sieve Loam Blocky Weak 2 0.5 – 6 80% retained on 20 mm sieve 50% retained on 2 mm sieve Sandy Clay Loam Blocky Moderate R-2; Type 3 6 Bedrock 2 0 – 2 0% retained on 20 mm sieve 5% retained on 2 mm sieve Loam Blocky Weak 2 2 – 5.5 80% retained on 20 mm sieve 50% retained on 2 mm sieve Sandy Clay Loam Blocky Moderate R-2; Type 3 5.5 Bedrock Figure 1 – Profile Hole One Figure 2 – Profile Hole One Soil Morphology Frost Creek Lot 28 Site and Soil Investigation 3/24/21 3 of 3 Figure 3 – Profile Hole Two Figure 4 – Profile Hole Two Soil Morphology Sincerely, JVA, INCORPORATED By: __________________ Julie Gustavson Design Engineer ATTACHMENT C – DISCHARGE PUMP CALCULATIONS Pump Selection for a Pressurized System - Single Family Residence Project Frost Creek Lot 28 Pump Select Parameters Discharge Assembly Size Transport Length Before Valve Transport Pipe Class Transport Line Size Distributing Valve Model Transport Length After Valve Transport Pipe Class Transport Pipe Size Max Elevation Lift Manifold Length Manifold Pipe Class Manifold Pipe Size Number of Laterals per Cell Lateral Length Lateral Pipe Class Lateral Pipe Size Orifice Size Orifice Spacing Residual Head Flow Meter 'Add-on' Friction Losses 1.50 91 40 1.50 6402 35 40 1.50 6 9 40 1.50 8 75 40 1.50 1/8 2 5 None 0 inches feet inches feet inches feet feet inches feet inches inches feet feet inches feet Calculations Minimum Flow Rate per Orifice Number of Orifices per Zone Total Flow Rate per Zone Number of Laterals per Zone % Flow Differential 1st/Last Orifice Transport Velocity Before Valve Transport Velocity After Valve 0.43 152 66.5 4 4.4 10.5 10.5 gpm gpm % fps fps Frictional Head Losses Loss through Discharge Loss in Transport Before Valve Loss through Valve Loss in Transport after Valve Loss in Manifold Loss in Laterals Loss through Flowmeter 'Add-on' Friction Losses 13.3 20.8 23.3 7.9 0.6 0.5 0.0 0.0 feet feet feet feet feet feet feet feet Pipe Volumes Vol of Transport Line Before Valve Vol of Transport Line After Valve Vol of Manifold Vol of Laterals per Zone Total Vol Before Valve Total Vol After Valve 9.6 3.7 0.9 31.7 9.6 36.4 gals gals gals gals gals gals Minimum Pump Requirements Design Flow Rate Total Dynamic Head 66.5 77.5 gpm feet 0 10 20 30 40 50 60 70 80 0 20 40 60 80 100 120 140 160 Net Discharge (gpm) PumpData PF5015 High Head Effluent Pump 50 GPM, 1-1/2HP 230V 1Ø 60Hz, 200V 3Ø 60Hz Legend System Curve: Pump Curve: Pump Optimal Range: Operating Point: Design Point: Inspection Result Eagle County, Colorado P.O. Box 179 500 Broadway Eagle, CO Phone: (970) 328-8730 Fax: (970) 328-7185 IVR Phone: 1-866-701-3307 Inspection Number: INSP-517417-2022 Permit Number: OWTS-021344-2021 Inspection Date: 09/12/2022 Inspector: Permit Type: OWTS Permit Inspection Type: OWTS Final Inspection Work Classification: NewOwner:Steven Gomez Job Address:967 GRAY ROCK DR IVR Pin Number:193044 EAGLE AREA, CO Project:<NONE> Parcel Number:210935103001 Contractor:Phone: (970) 376-6702 / Cell: (970) 376-6702Defina Construction, INC Inspection Status: Approved Inspection Notes Inspector Comments Added Item: Septic Tank A Valley Precast 1,500 gallon, single compartment tank with effluent filter and high water alarm placed on the outlet tee, followed by a 2,000 gallon Valley Precast three-compartment recirculating/dose tank was used. Added Item: Record Drawing Received 9/12/2022 from JVA Inc. Added Item: Record Photos Received 9/12/2022 from JVA Inc. Added Item: Site and Soil Received 11/9/2021 from JVA Inc. Added Item: Final Certification Letter Received 9/12/2022 from JVA Inc. Added Item: General Plan Received 11/9/2021 from JVA Inc. Added Item: Soil Treatment Area (STA) The STA is four beds consisting of four rows of 16 Infiltrator Quick 4 Plus Standard chambers for a total of 256 Infiltrator chambers. Added Item: Identification of Systems Contractor Defina Construction was the licensed installer. Monday, September 12, 2022 For more information visit: http://www.eaglecounty.us Page 1 of 2 Monday, September 12, 2022 For more information visit: http://www.eaglecounty.us Page 2 of 2 September 1, 2022 Claire Lewandowski, REHS, Environmental Health Specialist III Eagle County Environmental Health 500 Broadway Street Eagle, CO 81631 RE: Onsite Wastewater Treatment System Final Certification – 967 Gray Rock Dr, Frost Creek Lot 28 Dear Claire: The Onsite Wastewater Treatment System (OWTS) covered under Eagle County Permit No. OWTS-021344-2021 was installed by Defina Construction for 967 Gray Rock Dr. and is ready for final certification from Eagle County Environmental Health. This letter certifies that the construction of the OWTS was completed as per the approved design plan. The final record drawings from JVA, three-year maintenance contract, and construction photographs are provided as attachments. As part of the final approval process JVA ensured that start-up was completed by the manufacturer’s representative (Valley Precast, Inc) and completed a site visit to check all system components. The system is connected and can be monitored remotely as required in the PUD. Sincerely, JVA, INCORPORATED By: ________________________ Simon Farrell, P.E. Project Manager, Associate Enclosure: Attachment A – Record Drawings Attachment B – Maintenance Contract Attachment C – Construction Photographs CC: Chelsea Fagan, JVA ATTACHMENT A – RECORD DRAWINGS FROST CREEK LOT 28 ONSITE WASTEWATER TREATMENT SYSTEM EAGLE COUNTY, COLORADO RECORD DRAWINGS OCTOBER 2021 Set No._______ JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 © JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 CONFORMED TO CONSTRUCTION RECORD GRE Y R O C K D R I V E 50' P r i v a t e R i g h t- o f- W a y © JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 CONFORMED TO CONSTRUCTION RECORD © JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 CONFORMED TO CONSTRUCTION RECORD © JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 CONFORMED TO CONSTRUCTION RECORD © JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 CONFORMED TO CONSTRUCTION RECORD ATTACHMENT B – MAINTENANCE CONTRACT ATTACHMENT C – CONSTRUCTION PHOTOGRAPHS Lot 28 8/15/2022 To Whom It May Concern: We have been to the following site(s): 967 Gray Rock Dr, Lot 28, Frost Creek, Eagle We have verified that the system was started properly. The System went through several cycles with no issues. Sincerely, Scott McIntosh Service Manager FROST CREEK LOT 28 ONSITE WASTEWATER TREATMENT SYSTEM EAGLE COUNTY, COLORADO PERMIT SET APRIL 2021 Set No._______ JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver DESIGN CRITERIA AND NOTESG0.1 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 09/2021CLFCLFREVISED OWTS LOCATION1 GRE Y R O C K D R I V E 50' P r i v a t e R i g h t- o f- W a y CIVIL SITE PLANC1.0 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 09/2021CLFCLFREVISED OWTS LOCATION1 TREATMENT SYSTEM AND SITE DETAILSCD1.0 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 09/2021CLFCLFREVISED OWTS LOCATION1 SOIL TREATMENT AREA DETAILSCD1.1 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 09/2021CLFCLFREVISED OWTS LOCATION1 SOIL TREATMENT AREA DETAILS2 2CD1.2 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 09/2021CLFCLFREVISED OWTS LOCATION1 FROST CREEK LOT 28 ONSITE WASTEWATER TREATMENT SYSTEM EAGLE COUNTY, COLORADO PERMIT SET OCTOBER 2021 Set No._______ JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 DESIGN CRITERIA AND NOTESG0.1 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 09/2021CLFCLFREVISED OWTS LOCATION1 GRE Y R O C K D R I V E 50' P r i v a t e R i g h t- o f- W a y CIVIL SITE PLANC1.0 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 09/2021CLFCLFREVISED OWTS LOCATION1 TREATMENT SYSTEM AND SITE DETAILSCD1.0 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 09/2021CLFCLFREVISED OWTS LOCATION1 SOIL TREATMENT AREA DETAILSCD1.1 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 09/2021CLFCLFREVISED OWTS LOCATION1 SOIL TREATMENT AREA DETAILS2 2CD1.2 REVISION DESCRIPTIOND'WNDES'DDATENO.DESIGNED BY: DRAWN BY: CHECKED BY: JOB #: DATE: © JVA, INC.FROST CREEKLOT 28 OWTSEAGLE, COSHEET NO. 1037.25e APRIL 2021 SAF CLF CLF JVA, Inc.1319 Spruce Street www.jvajva.com Boulder, CO 80302 303.444.1951 Boulder ● Fort Collins ● Winter Park Glenwood Springs ● Denver 49466SIMON A . FAR R ELLPROF E S SIONA L E N G INEERCOLOR A D O REGIS T E RED10/14/2021 09/2021CLFCLFREVISED OWTS LOCATION1 October 6, 2021 Ms. Claire Lewandowski, REHS Eagle County Environmental Health 590 Broadway Eagle, CO 81631 RE: Frost Creek Lot 28 – Site and Soil Investigation for an Onsite Wastewater Treatment System (OWTS) JVA Job No. 1037.25e Dear Claire: Enclosed in this report are the results of the site and soil evaluation for Lot 28 proposed OWTS located in Frost Creek, Colorado. This report provides information needed to support the design of an OWTS including results from the preliminary investigation, the site visit, and the soil evaluation. Design calculations are included in the drawing Permit Set attached. PRELIMINARY INVESTIGATION In preparation for the site visit and soil evaluation, a preliminary investigation was conducted the week of November 3rd, 2020. Architectural site plans, aerial imagery, and previous Geotechnical investigations were used for the preliminary investigation. Geotechnical investigations were performed by HP Geotech in October 2002 across Frost Creek for OWTS suitability. Results from the HP Geotech report showed that for the proposed location, Test Hole A and B had a topsoil from zero to six inches deep and a sandy clay gravel from six inches to eight feet deep. No groundwater was encountered in either hole. SITE VISIT AND SOIL EVALUATION A site visit and soil evaluation were conducted the week of July 27th, 2021. The purpose of the site visit and soil evaluation was to confirm hypotheses from the preliminary investigation, identify the topography, landscape position, vegetation, and site constraints for the proposed OWTS, and to conduct a visual and tactile soil evaluation of the underlying soils where the proposed soil treatment area (STA) is to be located for both suitability and sizing. The topography of the site slopes from west to east. The dominant vegetation at the proposed OWTS consists of native grasses. Site Constraints are shown in the Permit Documents. For the visual and tactile soil evaluation, two soil profile holes were excavated using a tracked excavator in the locations identified in the Permit Documents. As seen in Table 1 below, soil morphology for Soil Profile Hole One from zero to six inches was Soil Type 2A, from six inches to four feet deep was Soil Type R-1, Option 1 with 3, and from four feet to eight feet deep was Soil Type R-1 Option 1 with 4. Soil morphology for Soil Profile Hole Two from six inches to eight feet deep was Soil Type R-1, Option 1 with 4. No redoximorphic features, indicating seasonally high groundwater, were observed in either hole. Figures 1 through 4 below show the soil profile holes Frost Creek Lot 28 Site and Soil Investigation 10/6/21 2 of 3 and corresponding morphology. Therefore, Soil Type R-1 Option 1 with 4 was identified as the soil type. Table 1 – Visual and Tactile Soil Results Profile Hole Depth (ft.) Percent Rock Soil Texture Soil Structure Type Soil Structure Grade Soil Type 1 0 – 0.5 0% retained on 20 mm sieve 5% retained on 2 mm sieve Loam Blocky Weak 2A 0.5 – 4 20% retained on 20 mm sieve 50% retained on 2 mm sieve Clay Loam Blocky Moderate R-1 Opt.1 w/ 3 4 – 8 10% retained on 20 mm sieve 30% retained on 2 mm sieve Clay Blocky Moderate R-1 Opt.1 w/ 4 2 0 – 0.5 0% retained on 20 mm sieve 5% retained on 2 mm sieve Loam Blocky Weak 2A 0.5 – 7 10% retained on 20 mm sieve 30% retained on 2 mm sieve Clay Blocky Moderate R-1 Opt.1 w/ 4 4 – 8 30% retained on 20 mm sieve 50% retained on 2 mm sieve Clay Blocky Moderate R-1 Opt.1 w/ 4 Figure 1 – Profile Hole One Figure 2 – Profile Hole One Soil Morphology Figure 3 – Profile Hole Two Figure 4 – Profile Hole Two Soil Morphology Frost Creek Lot 28 Site and Soil Investigation 10/6/21 3 of 3 Sincerely, JVA, INCORPORATED By: _______________________ Julie Gustavson Design Engineer