Attachment_7_-_Design_Rpt_including_GeoTech_Rept_2023_01_13_0001.pdf

ONSITE WASTEWATER TREATMENT

AND DISPOSAL DESIGN REPORT

for

VIRGIN RIVER CAMPGROUND

GLHN PROJECT #20049.20

JAN. 13, 2023

GLHN Architects & Engineers, Inc. |2939 E Broadway Blvd, Tucson, AZ 85716

T 520.881.4546 | F 520.795.1822 | GLHN.com

Virgin River Campground

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Septic Design Report GLHN# 20049.20

TABLE OF CONTENTS

INTRODUCTION 3

EXISTING CONDITIONS 3

SEWER DESIGN FLOWS 4

ONSITE WASTEWATER TREATMENT 4

OPERATION AND MAINTENANCE 5

PERFORMANCE ASSURANCE PLAN 7

APPENDICES

APPENDIX A: CONSTRUCTION DOCUMENTS

APPENDIX B: GEOTECHNICAL REPORT

APPENDIX C: DISPOSAL FIELD CALCULATIONS

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INTRODUCTION

This report was produced in support of the design for an onsite wastewater treatment facility and disposal works at Virgin River Campground in Mojave County, Arizona. The campground, owned by the Federal

Bureau of Land Management (BLM), has three restrooms that serve visitors year-round, every year. The scope of the work includes Title I and Title II services for the replacement of existing septic systems with new septic systems including new 2,500-gallon tanks for each restroom, new leach fields and related infrastructure.

PROJECT SITE DESCRIPTION

The campground is on 1934-acre federal land located in Mojave County, Arizona with a parcel number of

402-48-012. The property is framed on the Northwest by Interstate 15, which is the primary vehicle access. It is located approximately 20 miles southwest of St. George, Utah and comprises a portion of the southeast quarter of Section 15, Township 41 North, Range 14 West, Gila & Salt River Meridian.

EXISTING CONDITIONS

Land cover throughout the site is mostly desert valley vegetation. The site is relatively flat within a mountainous region and the property slopes from north to south. Along the southeast edge of the campground, the Virgin River flows to the southwest.

The Virgin River Canyon campground has three restroom facilities that serve campers year-round, every year. Each restroom facility is a 525 square foot brick, single story with 2 units per building and a janitorial closet. Restrooms 1 and 2 are located on the east side of the campground serving approximately 72 campsites. Restroom 3 is located on the west side of the campground serving approximately 38 campsites.

Campsites do not have power, water or sewer hookups, and amenities such as picnic tables and covered ramadas are shared.

Potable water for the restrooms comes from a well drilled and constructed in 1975, with Arizona Well

Registry number 55-637394. The well is drilled to a depth of 363 feet, and ground water is in the range of 250 feet to 270 feet below ground. The well yard is located in the northeast corner of the property close to

Interstate 15. Water is piped underground to the new tank yard next to the camp host site, near Restroom

1. The tank yard, constructed in 2021, consists of two water tanks, a meter and a new water chlorination treatment system.

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Septic Design Report GLHN# 20049.20

Electrical power is provided by Dixie Escalante Power Cooperative. The onsite public transmission lines run underground to transformers located at the well yard, the tank yard and restroom 3. Private electrical services continue beyond the transformers for the host camp site and the restrooms. There is no site lighting and no other utilities at the campground.

EXISTING ONSITE SEWER

Each restroom is connected to one onsite sanitary treatment and disposal system. Each system consists of a

2000-gallon tank for waste collection and a leach field for wastewater disposals. The systems were installed in 1976 but have been intermittently inspected and serviced. The tanks have been pumped twice in the past 25 years, by Aardvark Waste Services, out of St. George, Utah. As they have exceeded their design service life, system replacement is recommended, and will be necessary due to the observed deterioration of the inner walls of the tanks. Existing concrete tanks shall be broken up, demolished in place, and completely removed. The removed concrete tank material can be temporarily stored on site with proper environmental mitigation before being hauled and disposed of at the St. George, Utah landfill.

PROPOSED CONDITIONS

The proposed improvements for each restroom will include a new 2500-gallon tank for wastewater treatment, installed in location of existing, and a traditional trench with gravel and perforated pipe leach field for wastewater disposal. A diversion valve will be installed just downstream of each tank to direct wastewater to the newly constructed or existing leach field to allow for intermittent field drying. The leach field will be sized according to the percolation rate of the native soils, using the guidance of Arizona

Administrative Code (AAC), Title 18, Chapter 9, Water Pollution Control. The leach fields shown on the 65%

Design Development plans herein attached are sized using the soil absorption rate (SAR) from the geotechnical investigation by Ninyo & Moore for this project. Please refer to the attached geotechnical report..

SEWER DESIGN FLOW

Estimated daily flows reflect the current Arizona Administrative Code (AAC), Title 18, Chapter 9, Arizona

Department of Environmental Quality (ADEQ), and Water Pollution Control. Portions of the code referenced will be shown by Section number, beginning with “R18-9-“.

Average Daily Flow (ADF) rates were derived using Table 1, Unit Design Flows from the AAC Flow rates were calculated based upon the number of camping units, and applying a maximum occupancy rate of 65% based on an evaluation of historical daily vehicle counts. ADF are given in gallons per day (gpd). Please refer to the appended sewer calculation sheets.

PROPOSED SANITARY SEWER DRAIN LINES

New PVC gravity sewer lines will connect to each building sewer drain line, flowing to the new septic tank by gravity at a minimum slope of ¼ inch per foot (2%) and maximum slope of 3%. Sewer lines will have two feet of cover at a minimum, and cleanouts installed in maximum 100-foot intervals and at each change in direction. Each cleanout will have a threaded plug and lid that is traffic-rated and water-tight.

PROPOSED SEPTIC TANKS

Per AAC requirement, each septic tank will have a liquid capacity of 2500 gallons, with a baffle wall inside so that two-thirds of the volume is at the inlet side, and one-third at the outlet end. Tank material will be either concrete or fiberglass. Each tank will have a traffic-rated lid and an opening near each end for inspection and cleaning. The openings will be a minimum of 20 inches in diameter and will include risers to final grade, with water-tight metal lids.

ONSITE WASTEWATER DISPOSAL

Wastewater disposal trenches are designed per AAC R18-9-E302. The disposal (leach) fields are designed per AAC R18-9-E302.C.2.a using an absorption rate of 0.60 gpm/sf. This rate is derived from the included geotechnical report at the design depths of the percolated pipes.

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Septic Design Report GLHN# 20049.20

SEPTIC SYSTEM OPERATION AND MAINTENANCE

The onsite gravity flow sewer lines, septic tanks, and disposal (leach) fields will be maintained by BLM facilities staff or contracted services.

Regularly scheduled maintenance will be performed as outlined below. Inspections will be documented below and on additional forms as needed.

Annual inspections of septic tank. Pump out the tank as required, based on the inspection results.

Pump out the tank as required, based on the inspection results.

Routine monitoring of the private water meters at each building, monthly at a minimum. Immediately investigate building water systems for leaks in the event of an unusually high meter reading.

Twice annual inspections of the leach field. Evaluate condition of surface, measure liquid level at pump out ports.

Cleaning as needed to clear blockages will be performed by BLM facilities staff or contracted services, by snaking and flushing lines as required.

DATE INSPECTOR COMMENTS:

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Septic Design Report GLHN# 20049.20

DO’S AND DO NOT’S

This section covers general items that will greatly increase the effectiveness and life of the system.

DO

• Landscaping or permanent structures should be planned prior to installation to ensure that the integrity of the system and access to its components are not jeoperdized.

• Keep accurate records of maintenance and service calls. The results will be valuable if system problems occur. Ensure that whoever services the system keaps a complete record with this ranual.

Warranty information on system companents should also be kept with these records.

• Practice water conservation. Reducing the amount of water use increases the life of the system and lowers power consumption. Take short showers and do not let water run unnecessarily while washing hands, food, teeth, dishes, etc.

• Be aware that a simple toilet float can hang up and result in over 2,000 gallons per day of wasted water. Use water-saving devices in the toilet tank and don’t flush unnecessarily.

• Be very careful about disposing of disinfectants in the system. These chemicals, will inhibit biological activity and can cause the septic tank and/or filter to fail. Additionally, disinfectants such as chlorine can degrade chemicals impregnated into the drip emitters to prevent slime buildups Digging up and replacing clogged drip line is time consuming and very costly. If using a disinfectant becomes unavoidable, use as little as possible. Borax (1/ cup/gallon water) is a good substitute. Antibiotics should never be disposed of in a septic system.

• Make this manual a living document. If maintenance items are routinely performed that are not covered in this manual, write them down and attach them. Photographs can provide added value. Additional instruction will be especially helpful if the property is sold and another owner takes over operation of the system.

DO NOT

• Do not connect storm drains to the septic system or allow surface water to drain into it. This will cause overloading of the system.

• Do not use excessive quantities of water. Repair leaky toilets, faucets, or plumbing fixtures. For a comprehensive list of interior water savings tips, contact the Arizona Department of Water

Resources.

• Do not flush undesirable substances into the septic tank. Flushing flammable or toxic products may be dangerous. Other materials such as paper towels, rags, newspaper, cigarettes, coffee grounds, sanitary napkins, large amounts of hair and cooking grease are a maintenance nuisance. These materials will also increase the frequency of septic tank pumping and may damage the filter.

• Minimize driving over any of the items in this system. If the septic tank is in an area subject to possible traffic, consider placing a barricade or row of shrubs to discourage traffic unless the tank has been equipped with a special traffic lid.

• Do not enter the septic tank. Work on the tank should be done from the outside. Gases generated in the tank or the lack of oxygen can be fatal.

• Do not dispose of antibiotics in the septic system.

• Do not use concentrated chlorine tablets or other chlorine products.

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PERFORMANCE ASSURANCE PLAN

The operator's basic duties to be performed include:

• Seasonal Check for the Restroom systems (April and October), including o Check clean-outs for clogging o Check tank for evidence of grease and solids build-up o Clean outlet filter o Check and record depth of water in observation ports in leach field

• For the cost estimate, the septic tank is assumed to be pumped every 3-years.

• D-Boxes are replaced every 20 years

• Leach field is replaced every 30 years

• Septic tanks area replaced every 50 years.

ITEMS FREQUENCY ANNUALIZED COST

Seasonal Check Up April and October $300.00

Clean filter included in cost

Pump tanks $450.00

Check tank for solids included in cost

Replace D-boxes 1 time in 20-years $25.00

Leach field replacement 1 time in 50-years $100.00

Septic tank replacement 1 time in 50-years $90.00

Total estimated annual operation and maintenance cost $965.00

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Septic Design Report GLHN# 20049.20

APPENDIX A

VIRGIN RIVER SEPTIC SYSTEM

CONSTRUCTION PLANS

SEPTIC

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ALL RIGHTS RESERVED

PROJECT NO.: 20049.20

DESIGN BY:

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DATE: 2023/01/13

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VIRGIN RIVER CAMPGROUND

SEPTIC SYSTEM REPLACEMENT

MOHAVE COUNTY, ARIZONA

ST. GEORGE, UTAH FIELD OFFICE

DRAWING INDEX

GI001 COVER SHEET

CS101 SITE PLAN - RESTROOM 1

CS102 SITE PLAN - RESTROOM 2

CS103 SITE PLAN - RESTROOM 3

CS501 SITE DETAILS

INTERSTA

TE 15

PROJECT DESCRIPTION

THIS

SITE

PHOENIX

THIS SITE.

LAS VEGAS

STATE REFERENCE MAP

N.T.S.

VICINITY MAP

N.T.S.

SITE MAP

1" = 400'

THE PROJECT IS LOCATED APPROXIMATELY 20 MILES SOUTHWEST OF ST.

GEORGE, UTAH. LOCATED AT MILE POST 18, CEDAR POCKET EXIT, FROM

INTERSTATE 15, IN MOHAVE COUNTY, ARIZONA.

THE PROJECT CONSISTS OF REMOVAL AND REPLACEMENT OF THREE

EXISTING SANITARY SEWER SEPTIC SYSTEMS, INCLUDING THREE NEW

2,500-GALLON UNDERGROUND SEPTIC TANKS, NEW GRAVEL TRENCH

LEACH FIELDS AND ASSOCIATED PIPING.

GENERAL NOTES:

1. ALL WORK SHALL CONFORM TO THE CONTRACT, SPECIFICATIONS, DRAWINGS, AND

DETAILS.

2. THE WORK REQUIRES CLOSURE OF EACH RESTROOM; CONSTRUCTION TO PROCEED ONE

FACILITY AT A TIME. CONTRACTOR TO ENSURE REMAINING 2 RESTROOMS ARE FULLY

FUNCTIONAL AND ACCESSIBLE THROUGHOUT CONSTRUCTION. CONTRACTOR TO PROVIDE

A CONSTRUCTION SCHEDULE AND MAINTAIN UPDATES. OWNER WILL PROVIDE PUBLIC

NOTIFICATION.

3. THE CONTRACTOR SHALL PROVIDE: PUMP DRY EACH TANK AND HAUL OUT WASTEWATER,

DISPOSE OF WASTEWATER AND TANKS LEGALLY OFFSITE.

4. THE CONTRACTOR SHALL CONTACT ARIZONA BLUE STAKE (811 OR 1-800-782-5348) FOR

UTILITY LOCATION MARKINGS A MINIMUM OF TWO (2) WORKING DAYS PRIOR TO THE

COMMENCEMENT OF EXCAVATION.

5. AS-BUILT DRAWINGS OF THE EXISTING SEPTIC SYSTEMS DO NOT EXIST. THE CONTRACTOR

SHALL VERIFY ALL SITE CONDITIONS PRIOR TO COMMENCING WORK, AND NOTIFY THE

OWNER OF ANY SUBSTANTIAL DISCREPANCIES CONCERNING THE LOCATION AND

FUNCTION OF EXISTING UTILITIES AS SHOWN ON THESE DRAWINGS.

6. UTILITY LOCATIONS, AS SHOWN ON THE PLANS, WERE COMPILED BASED ON THE BEST

AVAILABLE INFORMATION. HOWEVER, UTILITY LOCATIONS ARE NOT TO BE CONSIDERED

EXACT OR COMPLETE. PRIOR TO COMMENCING WORK, THE CONTRACTOR SHALL VERIFY

THE HORIZONTAL AND VERTICAL LOCATION OF ALL UTILITIES WITH THE APPROPRIATE

ORGANIZATION AND POTHOLE FOR UTILITY LINES WHOSE EXACT HORIZONTAL OR VERTICAL

LOCATION IS IN QUESTION.

7. IT IS THE CONTRACTOR'S RESPONSIBILITY TO LOCATE ALL UNDERGROUND PIPELINES,

TELEPHONE, COMMUNICATIONS, ELECTRICAL CONDUITS, AND ANY STRUCTURES IN

ADVANCE OF CONSTRUCTION. THE CONTRACTOR SHALL OBSERVE ALL POSSIBLE

PRECAUTIONS TO AVOID ANY DAMAGE TO SUCH UTILITIES. THE ENGINEER AND/OR OWNER

WILL NOT WARRANT ANY UTILITY LOCATIONS AS SHOWN ON THESE PLANS, OR THOSE

OMITTED FROM THE SAME.

8. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TO PROTECT ALL EXISTING UTILITIES

AND IMPROVEMENTS "IN-PLACE" UNLESS OTHERWISE NOTED ON THE CONSTRUCTION

DOCUMENTS.

9. CONTRACTOR SHALL PROVIDE TEMPORARY FENCING AROUND ALL EXCAVATIONS. IN NO

CASE SHALL THE CONTRACTOR LEAVE OPEN TRENCHES WITHOUT SECURE FENCING.

10. THE CONTRACTOR SHALL COMPLY WITH ALL OCCUPATIONAL SAFETY AND HEALTH

ADMINISTRATION (OSHA) REQUIREMENTS, INCLUDING WORKING WITHIN CONFINED SPACE

AREAS. THE CONTRACTOR SHALL BE SOLELY RESPONSIBLE FOR THE DESIGN, INSTALLATION,

AND MAINTENANCE OF ALL REQUIRED SHORING.

11. ALL TREES, SHRUBS, AND VEGETATION SHALL BE PROTECTED DURING CONSTRUCTION,

EXCEPT WHEN THE REMOVAL OF THE TREES, PLANTS, OR VEGETATION IS SPECIFICALLY

NOTED ON THE PLANS, OR APPROVED BY THE OWNER.

12. CONTRACTOR SHALL GRADE ALL DISTURBED AREAS TO DRAIN, COMPACTED TO MIN 85%

DRY DENSITY, AND RAKE TO A CLEAN NEAT SURFACE.

13. THE CONTRACTOR SHALL COORDINATE POWER SHUTDOWN WITH DIXIE ESCALANTE AS

REQUIRED.

FLAGSTAFF

KINGMAN

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LITTLE FIELD

RESTROOM 1

CS101

RESTROOM 2

CS102

RESTROOM 3

CS103

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SEPTIC TANK

SANITARY SEWER CLEANOUT

WATER FOUNTAIN

TRANSFORMER

ELECTRIC PEDESTAL

MISCELLANEOUS- UNKNOWN

UNKNOWN 2.5X2.5 VAULT

FIRE PIT

GRILL

PICNIC TABLE

NEW EXISTINGFEATURE

GROUND LINE PROFILE

CURB

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SANITARY SEWER GRAVITY LINE

WATER

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AC PAVEMENT

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MATERIALS LIST

MOBILIZATION E.A. 1

SEPTIC TANK REMOVAL E.A. 3

NEW SEPTIC TANK INSTALL E.A. 3

SOLID 4" PVC L.F. 245

PERFORATED 4" PVC L.F. 660

PERCOLATION GRAVEL C.Y. 330

AGGREGATE BASE COURSE C.Y. 1.2

EARTHWORK C.Y. 877

FILTER FABRIC S.F. 1980

DIVERSION VALVE E.A. 3

DISTRIBUTION BOX E.A 5

CLEANOUT E.A 4

NOTE: QUANTITIES ARE APPROXIMATE AND NOT ALL-INCLUSIVE.

CONTRACTOR SHALL CALCULATE OWN QUANTITIES.

SEPTIC SYSTEM LEACH FIELD SS

CONL ST PC

2171.14

CONL

2170.16

CONL

2170.55

CONL

2170.50

CONL PT

2170.42

CONL ST PC

2170.12

CONL

2170.20

CONL PT

2170.40

CONL

2169.45

CONL

2169.44

CONL

2168.89

CONL ST

2168.92

CONL

2169.42

CONL

2169.30

CONL

2169.53

CONL

2169.51

CONL

2169.49

CONL

2169.70

CONL

2170.47

BLDG ST

2170.00

BLDG

2170.94BLDG

2171.11

BLDG

2170.59

SEPTIC

MISC

2170.87

CO

BLDG

2171.50

BLDG

2171.51

BLDG

2171.55

BLDG CL

2171.10

DRTS

2171.75

DRTS

2172.29

DRTS

2172.93

DRTS

2173.35

DRTS

2173.68

MISC

2173.18

PTBL

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PIT

DRTS

2172.67 DRTS

2171.86

DRTS

2172.52

DRTS

2172.10

DRTS

2171.30

DRTS

2171.15

PTBL

DRTS

2170.98

DRTS

2170.72

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PROJECT NO.: 20049.20

DESIGN BY:

DRAWN BY:

CHECKED BY:

DATE: 2023/01/13

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1. FIELD-LOCATE EXISTING 2,000 GALLON CONCRETE SEPTIC

TANK, CUT BUILDING SEWER LINE, REMOVE AND DISPOSE OF

TANK OFF SITE. EXCAVATE AS REQUIRED TO PLACE NEW SEPTIC

TANK, CONNECT TO BUILDING SEWER LINE. REFER TO DETAIL 1,

SHEET CS501 FOR TANK DETAIL.

2. NEW 4" SANITARY SEWER LINE AT 2% MIN SLOPE, REPLACE

EXISTING AS REQUIRED.

3. NEW 4" LEACHATE LINE AT 1% MIN SLOPE

4. NEW 4" PVC DIVERSION VALVE, AMERICAN MANUFACTURING

"BULL RUN VALVE" OR APPROVED EQUAL. SEE DETAIL 5, SHEET

CS501. FIELD-LOCATE AND CONNECT TO EXISTING LEACHATE

LINE.

5. NEW 4" SANITARY SEWER CLEANOUT SEE DETAIL 3, SHEET CS501

6. NEW DISTRIBUTION BOX SEE DETAIL 2, SHEET CS501

7. NEW 4" PERFORATED PIPE SET LEVEL IN GRAVEL-FILLED TRENCH

PER DETAIL 4, SHEET CS501. LENGTH PER PLAN.

8. APROX 200' WEST OF RESTROOM 1, HOST SITE RV DUMP, DRAIN

TO BE FIELD LOCATED AND TIED BACK INTO NEW SEPTIC

SYSTEM.

9. EXISTING WATER VALVE ASSEMBLY TO REMAIN, PROTECT IN

PLACE.

10. APPROXIMATE LOCATION OF EXISTING LEACH FIELD, PROTECT

IN PLACE. FIELD-LOCATE FIELD AND INLET PRIOR TO SITE

EXCAVATION.

KEYNOTES

EXISTING

RESTROOM 1

EXISTING

RAMADA

90.00'

40.00'

BLDG ST

2167.21

BLDG

2167.56

BLDG

2167.15

BLDG

2167.64

DRTS

2167.92

DRTS

2167.34

E

DRTS

2167.48

DRTS

2167.36

MISC

2167.86MISC

2167.39BLDG

2168.06 BLDG

2168.32

BLDG

2167.99 BLDG CL

2167.38

MISC

2167.07

DRTS

2167.50

DRTS

2167.32

DRTS

2165.91

DRTS

2165.40

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PROJECT NO.: 20049.20

DESIGN BY:

DRAWN BY:

CHECKED BY:

DATE: 2023/01/13

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KEYNOTES

EXISTING

RESTROOM 2

EXISTING

RAMADA

1. FIELD-LOCATE EXISTING 2,000 GALLON CONCRETE SEPTIC

TANK, CUT BUILDING SEWER LINE, REMOVE AND DISPOSE OF

TANK OFF SITE. EXCAVATE AS REQUIRED TO PLACE NEW SEPTIC

TANK, CONNECT TO BUILDING SEWER LINE. REFER TO DETAIL 1,

SHEET CS501 FOR TANK DETAIL.

2. NEW 4" SANITARY SEWER LINE AT 2% MIN SLOPE, REPLACE

EXISTING AS REQUIRED.

3. NEW 4" LEACHATE LINE AT 1% MIN SLOPE

4. NEW 4" PVC DIVERSION VALVE, AMERICAN MANUFACTURING

"BULL RUN VALVE" OR APPROVED EQUAL. SEE DETAIL 5, SHEET

CS501. FIELD-LOCATE AND CONNECT TO EXISTING LEACHATE

LINE.

5. NEW 4" SANITARY SEWER CLEANOUT SEE DETAIL 3, SHEET CS501

6. NEW DISTRIBUTION BOX SEE DETAIL 2, SHEET CS501

7. NEW 4" PERFORATED PIPE SET LEVEL IN GRAVEL-FILLED TRENCH

PER DETAIL 4, SHEET CS501. LENGTH PER PLAN.

8. EXISTING JOSHUA TREES, PROTECT IN PLACE.

9. EXISTING HOST SITE RV DUMP WITH WATER LINE, DRAIN TO BE

FIELD LOCATED AND TIED BACK INTO NEW SEPTIC SYSTEM.

WATER LINE TO REMAIN, PROTECT IN PLACE.

10. EXISTING WATER VALVE ASSEMBLY TO REMAIN, PROTECT IN

PLACE.

11. EXISTING DIXIE ESCALANTE PULL BOX TO REMAIN, PROTECT IN

PLACE. CONTRACTOR TO LOCATE SECONDARY POWER LINES.

12. APPROXIMATE LOCATION OF EXISTING LEACH FIELD, PROTECT

IN PLACE. FIELD-LOCATE FIELD AND INLET PRIOR TO SITE

EXCAVATION.

60.00'

40.00'17.22'

48.53'

46.19'

16.25'

14.26'

DRTS

2098.74

MISC

2101.69

SEPTIC

T

DRTS

2101.58

DRTS

2101.44

DRTS

2101.88

DRTS

2102.57

DRTS

2102.05

DRTS

2100.57

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E E

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W W

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ALL RIGHTS RESERVED

PROJECT NO.: 20049.20

DESIGN BY:

DRAWN BY:

CHECKED BY:

DATE: 2023/01/13

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87654321 COPYRIGHT 2023 GLHN ARCHITECTS & ENGINEERS, INC.

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0A1 SITE PLAN - RESTROOM 3

5 10 20

CS103

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KTD

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KEYNOTES

EXISTING

RESTROOM 3

EXISTING

RAMADA

1. FIELD-LOCATE EXISTING 2,000 GALLON CONCRETE SEPTIC

TANK, CUT BUILDING SEWER LINE, REMOVE AND DISPOSE OF

TANK OFF SITE. EXCAVATE AS REQUIRED TO PLACE NEW SEPTIC

TANK, CONNECT TO BUILDING SEWER LINE. REFER TO DETAIL 1,

SHEET CS501 FOR TANK DETAIL.

2. NEW 4" SANITARY SEWER LINE AT 2% MIN SLOPE, REPLACE

EXISTING AS REQUIRED.

3. NEW 4" LEACHATE LINE AT 1% MIN SLOPE

4. NEW 4" PVC DIVERSION VALVE, AMERICAN MANUFACTURING

"BULL RUN VALVE" OR APPROVED EQUAL. SEE DETAIL 5, SHEET

CS501. FIELD-LOCATE AND CONNECT TO EXISTING LEACHATE

LINE.

5. NEW 4" SANITARY SEWER CLEANOUT SEE DETAIL 3, SHEET CS501

6. NEW DISTRIBUTION BOX SEE DETAIL 2, SHEET CS501

7. NEW 4" PERFORATED PIPE SET LEVEL IN GRAVEL-FILLED TRENCH

PER DETAIL 4, SHEET CS501. LENGTH PER PLAN.

8. APROX 85' NW FROM RESTROOM, EXISTING HOST SITE RV DUMP,

DRAIN TO BE FIELD LOCATED AND ABANDONED IN PLACE.

REMOVE YARD HYDRANT TO 18" BELOW GRADE, CAP, AND

BACKFILL.

9. EXISTING WATER VALVE ASSEMBLY TO REMAIN, PROTECT IN

PLACE.

10. EXISTING DIXIE ESCALANTE TRANSFORMER TO REMAIN, PROTECT

IN PLACE. CONTRACTOR TO LOCATE SECONDARY POWER

LINES.

11. APPROXIMATE LOCATION OF EXISTING LEACH FIELD, PROTECT

IN PLACE. FIELD-LOCATE FIELD AND INLET PRIOR TO SITE

EXCAVATION.

60.00'

60.00'

25.09'

8.33'

.86

ALL RIGHTS RESERVED

PROJECT NO.: 20049.20

DESIGN BY:

DRAWN BY:

CHECKED BY:

DATE: 2023/01/13

BU

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87654321

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87654321 COPYRIGHT 2023 GLHN ARCHITECTS & ENGINEERS, INC.

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LEACH FIELD TRENCH SECTION4 NOT TO SCALE

2,500 GALLON SEPTIC TANK1 NTS

5' -9

4'

-9 "6'

5' 4" INLET & OUTLET

PIPE AND FITTINGS

TYP.

24" DIA. GAS-TIGHT RING

AND COVER, TYP. X 2

ELEVATION 4" A.B.C. ON NATIVE SOIL

OR BEDDING PER TANK

MANUFACTURER, LEVEL

16'-10"

A A

PLAN

1. LIQUID CAPACITY: 2,500 GALLONS WITH 2 3

VOLUME IN FIRST (INLET) SIDE.

2. BOX DESIGN LOAD: H-20 TRAFFIC WITH 1

TO 6 FEET COVER.

3. MINIMUM EXCAVATION 7'- 0" x 17'-10" x

9'-6" DEEP, FOR TANK SHOWN.

4. JENSEN PRE-CAST CONCRETE TANK AS

SHOWN OR APPROVED EQUAL MEETING

ARIZONA ADMINISTRATIVE CODE (A.A.C.),

TITLE 18, CHAPTER 9, SECTION R18-9-A314.

5. PRIOR TO BACKFILLING, TANK SHALL BE

TESTED PER A.A.C. R18-9-A314. TESTING

MUST BE SIGNED OFF BY OWNER.

NOTES:

CONCRETE RISERS BRING TO

SURFACE FINISH GRADE

CS501

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TE

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HDPE DISTRIBUTION BOX D-52 NOT TO SCALE

4" FROM

SEPTIC TANK

4" OUTLET TO

LEACH FIELD (TYP OF 3)

11"

5- 1/

2" A

T O

UT

LE

TS

(T

YP

O

F 5)

4" INLET

PLASTIC PIPE

SEALS (TYP)

6- 1/

2" A

T

IN

LE

T

15-1/2"

ADDITIONAL LINE

AS NEEDED

PER PLAN

KNOCKOUT

NOT USED

COVER

WASHED GRAVEL OR ROCK, UNIFORMLY

GRADED 3/4" MIN, 1-1/2" MAX (TYP)

NATIVE BACKFILL, COMPACT TO

85% OF MAXIMUM DENSITY AS

DETERMINED BY ASTM D698 (TYP)

1 LAYER FILTER

FABRIC (TYP)

8'

(TYP)

1'-6"

(TYP)

3'-0"

(TYP)

V A

RI

ES

9" M

IN

" M A

X 2"

4"Ø PVC PERFORATED PIPE SET

LEVEL IN CENTER OF TRENCH,

LENGTH PER PLAN

6" TRAFFIC-RATED (H20)

FRAME AND COVER,

WATER TIGHT LID

COMPACTED BACKFILL OR

UNDISTURBED EARTH

STANDARD 4" X 45° BEND

TO BE LAID ON UNDISTURBED EARTH OR

COMPACTED SELECT MATERIAL (TYPE B) OR

A.B.C.

CLEANOUT CONTROL

POINT

STANDARD

4" X 4" WYE

CLASS 'AA' CONC. PER

MAG SECTION 725, 6"

THICK, 24" DIA.

5" M

A X.

THREADED CLEANOUT PLUG

1-

1/ 2"

EXISTING GRADE

FLOW

CAP IF END OF LINE

24"

SEWER CLEANOUT3 NOT TO SCALE

4" PVC DIVERSION VALVE5 NOT TO SCALE

6" TRAFFIC-RATED (H20)

FRAME AND COVER,

WATER TIGHT LID

COMPACTED BACKFILL OR

UNDISTURBED EARTH

CLASS 'AA' CONC. PER

MAG SECTION 725, 6"

THICK, 24" DIA.

5" M

A X.

1- 1/

2"

EXISTING GRADE

FROM SEPTIC TANK

24"

4" PVC RISER

LENGTH AS REQUIRED 4" PVC DIVERSION VALVE OR

EQUIVALENT, CONNECT TO

NEW PVC WYE

TO NEW LEACH

FIELD, DIVERSION

TO EXISTING

LEACH FIELD NOTES:

1. NUMBER AND LENGTH OF TRENCHES PER PLAN. LENGTH NOT TO

EXCEED 100'.

2. FILTER FABRIC TO OVERLAP AS REQUIRED TO ENSURE NO GAPS IN

COVERAGE OVER GRAVEL.

V A

RI

ES

" M

IN

" M A

X

FINISHED GRADE

12" COMPACTED BACKFILL OR

UNDISTURBED EARTH

1" M

IN

12" 1" M

IN

NOTE:

SEE PLAN FOR NUMBER AND ORIENTATION OF OUTLET PIPES.

APPENDIX B

GEOTECHNICAL REPORT

APPENDIX C

DISPOSAL FIELD

CALCULATIONS

Project Proj. No: 20049.20 Bureau of Land Management Date: Oct-22 Virgin River Campground Computed KTD Septic System Replacement Checked: LVL

Design Flows Per AAC Title 18 - Environmental Quality, Chapter 9 - Department of Environmental Quality, Water Pollution Control Table 1. Unit Design Flows

Wastewater Source Applicable Unit Sewage Design Flow, per Applicable Unit (gpd)

No. Units Average daily dry weather flow (gpd)

Camp, Campground, overnight, flush toilets Restroom 1 Camping Unit 75 23 1725

Subtotal ADF 1725 At max. 60% occupancy 1035

Total ADF 1035

Average daily dry weather flow Septic System Rest Room 1 1035 gpd

0.72 gpm

Dry Weather peaking Factor R18-9-E301. 4.01

Upstream Population less than 100 Dry Weather Peaking Factor 3.62 Dry Weather peak flow, per day 3,747 gpd equals peak flow per minute: 2.6 gpm Wet weather peak percentage 10% Peak wet weather flow 4,121 gpd Design Peak wet weather flow 2.9 gpm

Any point in a sewer main when flowing full can accommodate a peak wet weather flow calculated by multiplying the sum of the upstream sources of flow from Table 1, Unit Design Flows by a dry weather peaking factor based on upstream population, as tabulated, and adding a wet weather infiltration and inflow rate based on either a percentage of peak dry weather flow or a gallons per acre rate of flow;

20049.20 Septic Calcs - Rest room 1 Design Flows Page 1

Project Proj. No:

Bureau of Land Management Date:

Virgin River Campground Computed Septic System Replacement Checked:

Disposal System Trenches per R18-9-E302

Absorption area per R18-9-E302.C.2.a

Leach field - Restroom 1

* SAR 0.60 gpd/sf Bottom width of trench 3.00 ft Height of trench below perf pipe 4.00 ft

Trench absorption area 11.00 sf per lf of trench Design flow (ADF) 1035 gpd

Total Required Trench length 156.8 lf Length of individual Trench 90.0 ft Number of Trenches: 1.7

Provide two, 90-foot long tranches

* Ref to Geotech report and Uniform Site Investigation Report Form by Ninyo&Moore, November 2022

20049.20 Septic Calcs - Rest room 1 Disposal Page 1

Virgin River Campground Computed KTD Septic System Replacement Checked: LVL

Design Flows Per AAC Title 18 - Environmental Quality, Chapter 9 - Department of Environmental Quality, Water Pollution Control Table 1. Unit Design Flows

Wastewater Source Applicable Unit Sewage Design Flow, per Applicable Unit (gpd)

No. Units Average daily dry weather flow (gpd)

Camp, Campground, overnight, flush toilets Restroom 2 Camping Unit 75 39 2500

Subtotal ADF 2500 At max. 60% occupancy 1500

Total ADF 1500

Average daily dry weather flow Septic System Rest Room 2 1500 gpd

1.04 gpm

Dry Weather peaking Factor R18-9-E301. 4.01

Upstream Population less than 100 Dry Weather Peaking Factor 3.62 Dry Weather peak flow, per day 5,430 gpd equals peak flow per minute: 3.8 gpm Wet weather peak percentage 10% Peak wet weather flow 5,973 gpd Design Peak wet weather flow 4.1 gpm

Any point in a sewer main when flowing full can accommodate a peak wet weather flow calculated by multiplying the sum of the upstream sources of flow from Table 1, Unit Design Flows by a dry weather peaking factor based on upstream population, as tabulated, and adding a wet weather infiltration and inflow rate based on either a percentage of peak dry weather flow or a gallons per acre rate of flow;

20049.20 Septic Calcs - Rest room 2 Design Flows Page 1

Virgin River Campground Computed Septic System Replacement Checked:

Disposal System Trenches per R18-9-E302

Absorption area per R18-9-E302.C.2.a

Leach field - Restroom 2

* SAR 0.60 gpd/sf Bottom width of trench 3.00 ft Height of trench below perf pipe 4.00 ft

Trench absorption area 11.00 sf per lf of trench Design flow (ADF) 1500 gpd

Total Required Trench length 227.3 lf Length of individual Trench 45.0 ft Number of Trenches: 5.1

Provide a total of 225 ft trench length

* Ref to Geotech report and Uniform Site Investigation Report Form

20049.20 Septic Calcs - Rest room 2 Disposal Page 1

Virgin River Campground Computed KTD Septic System Replacement Checked: LVL

Design Flows Per AAC Title 18 - Environmental Quality, Chapter 9 - Department of Environmental Quality, Water Pollution Control Table 1. Unit Design Flows

Wastewater Source Applicable Unit Sewage Design Flow, per Applicable Unit (gpd)

No. Units Average daily dry weather flow (gpd)

Camp, Campground, overnight, flush toilets Restroom 3 Camping Unit 75 33 2475

Subtotal ADF 2475 At max. 60% occupancy 1485

Total ADF 1485

Average daily dry weather flow Septic System Rest Room 3 1485 gpd

1.03 gpm

Dry Weather peaking Factor R18-9-E301. 4.01

Upstream Population less than 100 Dry Weather Peaking Factor 3.62 Dry Weather peak flow, per day 5,376 gpd equals peak flow per minute: 3.7 gpm Wet weather peak percentage 10% Peak wet weather flow 5,913 gpd Design Peak wet weather flow 4.1 gpm

Any point in a sewer main when flowing full can accommodate a peak wet weather flow calculated by multiplying the sum of the upstream sources of flow from Table 1, Unit Design Flows by a dry weather peaking factor based on upstream population, as tabulated, and adding a wet weather infiltration and inflow rate based on either a percentage of peak dry weather flow or a gallons per acre rate of flow;

20049.20 Septic Calcs - Rest room 3 Design Flows Page 1

Virgin River Campground Computed Septic System Replacement Checked:

Disposal System Trenches per R18-9-E302

Absorption area per R18-9-E302.C.2.a

Leach field - Restroom 3

* SAR 0.60 gpd/sf Bottom width of trench 3.00 ft Height of trench below perf pipe 4.00 ft

Trench absorption area 11.00 sf per lf of trench Design flow (ADF) 1485 gpd

Total Required Trench length 225.0 lf Length of individual Trench 60.0 ft Number of Trenches: 3.8

Provide four, 60-foot long trenches

* Ref to Geotech report and Uniform Site Investigation Report Form

20049.20 Septic Calcs - Rest room 3 Disposal Page 1