Individual onsite wastewater planning

Size the load. Trace the assumptions. Test the site.

A transparent preliminary design workspace for septic tank capacity, conceptual geometry, soil absorption area and installation planning.

Calculation statusSite data neededEngine 1.9 · locally saved

ProjectSiteApproving authoritySafety rule profilePrepared by

Printable project recordCapture every input, output and hidden section

The full report expands all four diagrams, records inactive stored values and dropdown choices, includes all quote lines and sources, and prints the current checklist status. It may contain customer and pricing information.

Sample Data Lab

Load a complete source-based test case

Each sample populates every major input so you can test, modify and compare results before entering real project information.

Current project sampleNo sample loadedYour current project is unchanged.

Choose sample data

Select a case to preview it. Your current project changes only after you click Load selected sample.

Selected caseNothing selected yet4 complete test cases available

One sample at a timeChoose a sample from the dropdown

Its public inputs, illustrative assumptions, expected result and source will appear here without changing your current project.

Public values and illustrative assumptions are separated for the selected sample. Exact trench layouts for the Washington cases come from the listed test geometry. Louisiana’s layout uses an illustrative percolation result with the state’s published line-length table. Replace every illustrative value and confirm all public values with the approving authority before real use.

Wastewater load

What defines the design flow?

ApartmentsBedrooms / apartmentDesign people / apartment

Flow allowances and tank assumptions

Editable generic planning basisEPA guidance describes common residential code ranges, but it is not a universal code. Replace these values with the approving authority’s current rules.

Flow / persongal/dayFlow / bedroomgal/dayTank sizing methodChoose the method stated by the public example or your approving authority.Hydraulic retentiondaysSolids allowance / person / yeargalPlanned pump intervalyearsMinimum approved tankgalAvailable tank-size incrementgal

Soil absorption

Verify the field design inputs

I have an authority-accepted field-sizing basisConfirm the loading rate through the required site and soil evaluation.

Field-sizing methodSoil loading rategal/day/ft²Field report / table referenceTrench infiltrative widthftMaximum trench lengthftClear spacing between trenchesftReserve field% of primary infiltrative areaUsable site areaft²Enter 0 if not measured.DistributionTimed dosing enabledMarks the concept only; pump, dose, controls and alarm design remain outside this calculator.

Site constraints and vertical separation

Proposed trench-bottom depthftRequired groundwater separationftSeasonal high-water depthftDepth below finished grade; 0 means unknown.Restrictive-layer depthftDepth below finished grade; 0 means unknown.Required restrictive-layer separationftRestrictive-layer limit is strictChecked means the measured separation must be greater than the entered value, not equal to it.Site slope%Authority maximum slope%Use a strict “less than” limitChecked means a site exactly at the entered limit does not pass.

Installation planning

Set the physical constraints

Building-to-tank pipe runftTank-to-field pipe runftMaterial planning allowance% added to calculated pipe, aggregate, pervious cover and tank bedding; 0–50%Building sewer slope near tank% fall; survey the final invert elevationsTank soil coverft

Conceptual tank envelope

Not a structural tank designUse a listed, watertight tank and its approved dimensions, burial, traffic loading, anchoring, bedding and backfill instructions.

Conceptual liquid depthftFreeboardftLength : width ratioBedding allowanceftOutlet below inletftAccess opening diameterft

Detailed diagram callouts

Construction-coordination inputs onlyApproved exterior dimensions, wall and lid thickness, reinforcement, load rating, penetrations, partition openings, anchors, risers and seals must come from the selected tank submittal and approved plan.

These are editable planning values. Replace them with the approving authority, soil report, survey and selected product requirements before construction.

Approved tank product

Approved exterior lengthft0 = manufacturer submittal not attachedApproved exterior widthft0 = manufacturer submittal not attachedApproved exterior heightft0 = manufacturer submittal not attachedPrimary compartment share% · planning split; confirm approved tank

Connections and baffles

Building sewer diameterftTank outlet / conveyance diameterftInlet tee above liquidftInlet tee below liquidftVent clearance above inlet teeftOutlet tee above liquidftOutlet tee submergence% of liquid depthSolid effluent-line slope% fall · local design / survey valueServiceable effluent filter includedRecommended planning option; verify authority and tank approval.

Absorption-trench assembly

Field lateral diameterftPerforated lateral slope% · separate from building sewer gradeAggregate below pipeftAggregate above pipeftAggregate minimum sizeftAggregate maximum sizeftFinished overfill crownft

Authority setback placeholders

These are report placeholders—not universal requirements. Replace them with the values for the tank, field, wells and neighboring features in your jurisdiction.

Minimum from buildingftMinimum from drinking-water wellftMinimum from property lineftMinimum from surface waterft

Full site-plan sketch inputs

Rough rectangular planning envelopeThese dimensions drive a diagrammatic sketch only. Parcel bearings, easements, contours, utilities and final component coordinates require a survey and approved site plan.

Rough lot width / frontageftRough lot depthftRough building widthftRough building depthft

Rough lot area: 37,500 ft². Enter a usable treatment area in the site section when known.

Live design summary

Apartment wastewater concept

Site data needed

Design flow

1,200 gal/day8 bedrooms × allowance

Selected tank

3,000 galnext entered nominal increment

Infiltrative area

Heldverify field basis first

Field layout

—site input incomplete

No local design profile selected

The displayed allowances are editable planning values. Enter the approving authority and replace every value that differs from its current rules.

Multifamily classification

Apartment systems commonly require an engineered distribution design, special operating approval, or treatment beyond a conventional single-home system.

Drainfield result held

Confirm that the field-sizing basis comes from the required site/soil evaluation and the approving authority to release the field result.

Approved tank dimensions not attached

The calculated tank envelope is conceptual. Enter the selected manufacturer's approved exterior dimensions before relying on the detailed planning view for coordination.

Calculation report

Transparent design basis

Generated when report printing begins.

A · Design flow

1,200 gal/day

8 bedrooms × allowance controls the current estimate.

Design population: 12 people
Equivalent bedrooms: 8
Occupancy route: 900 gal/day
Bedroom route: 1,200 gal/day

Show calculation

The selected load route is calculated once. Apartment mode compares occupancy and bedroom routes and uses the higher value; it does not add them.

Q = max(population × 75, bedrooms × 150)

B · Tank capacity

3,000 gal

Selected nominal capacity using hydraulic retention + solids storage.

Hydraulic storage: 2,400 gal
Solids allowance: 381 gal
Calculated minimum: 2,781 gal
Nominal selected-volume retention: 2.18 days

Show calculation

V = Q × retention + people × solids allowance × pump interval

Then apply the entered minimum tank and round upward to the entered available size increment.

C · Soil absorption

Awaiting verified field basis

The tank estimate remains available while the dependent field result is suppressed.

Show calculation

A = Q ÷ authority-accepted soil loading rate

Trench length = infiltrative bottom area ÷ credited trench width.

Shesons OnsiteFlow SOF · complete project record

Full detailed inputs and outputs

Generated when full-report printing begins.This appendix records values that may be collapsed, inactive or hidden in the interactive screen. Stored inactive alternatives are identified and do not control the current calculation.

Private project record · preliminary only.This report can contain customer contact details and pricing. It is not a permit, survey, structural design, excavation release or construction authorization.

Appendix A

Complete input register

Every stored project field, including inactive mode values and dropdown choices.

Project, provenance and selections

Field	Recorded value	Use / status
Project name	Apartment wastewater concept	Current project value
Site / parcel	Not entered	Current project value
Approving authority	Not entered	Current project value
Safety rule profile	Generic · user-entered rules	Selected profile; confirm the current local rules before real useAvailable choices: Generic · user-entered rulesKansas KDHE Bulletin 4-2Louisiana LDH · Title 51Washington WAC 246-272A
Prepared by	Not entered	Current project value
Display units	US customary	Calculations are stored canonically in US units and converted for displayAvailable choices: US customaryMetric
Wastewater sizing basis	Apartments	Selected design-flow routeAvailable choices: ApartmentsBedroomsPeopleDirect flow
Sample dropdown selection	No sample selected	A preview selection does not change the project until it is loadedAvailable choices: Kansas · 4-bedroom homeLouisiana · 3-bedroom / 2-bath homeWashington · 3-bedroom homeWashington · 6 apartments
Loaded sample basis	No sample loaded	Current project is not attached to a sample baseline
Screen diagram selection	Simple	The full report prints all four views regardless of this screen selectionAvailable choices: SimpleDetailed measurementsFull site sketchConstruction blueprint

Wastewater load inputs — active and retained alternatives

Field	Recorded value	Use / status
Apartments	4	Active load route
Bedrooms per apartment	2	Active load route
Design people per apartment	3	Active load route
Total bedrooms	3	Stored inactive value — not used by the current load route
People	6	Stored inactive value — not used by the current load route
People per bedroom	2	Used to derive an equivalent bedroom/population value where applicable
Direct authority/design flow	450 gal/day	Stored inactive value — not used by the current load route
Flow allowance per person	75 gal/day	Used by the current load route
Flow allowance per bedroom	150 gal/day	Used by the current load route

Tank sizing inputs

Field	Recorded value	Use / status
Tank sizing method	Hydraulic retention + solids storage	Selected tank-capacity routeAvailable choices: Hydraulic retention + solids storageDaily-flow multiplierCapacity per bedroomAuthority-entered minimum
Daily-flow multiplier	3×	Stored inactive value — not used by the current tank sizing route
Capacity per bedroom	250 gal	Stored inactive value — not used by the current tank sizing route
Hydraulic retention period	2 days	Active tank sizing route
Solids allowance per person per year	10.6 gal / person / year	Active tank sizing route
Pump interval	3 years	Active tank sizing route
Entered minimum tank	1,000 gal	Applied to every tank sizing method
Nominal tank size increment	250 gal	Required capacity is rounded upward to this increment

Tank geometry, cover and approved product inputs

Field	Recorded value	Use / status
Conceptual liquid depth	5 ft	Current project value
Conceptual freeboard	1 ft	Current project value
Conceptual length-to-width ratio	2.5:1	Current project value
Entered tank cover	1 ft 6 in	Manufacturer and structural rating control
Entered tank bedding depth	6 in	Manufacturer and subgrade conditions control
Inlet-to-outlet drop	2 in	Current project value
Access opening diameter	2 ft	Current project value
Approved tank exterior length	0 in	Not entered — manufacturer hold
Approved tank exterior width	0 in	Not entered — manufacturer hold
Approved tank exterior height	0 in	Not entered — manufacturer hold

Soil and absorption-field sizing inputs

Field	Recorded value	Use / status
Field sizing method	Design flow ÷ soil loading rate	Selected absorption-field routeAvailable choices: Design flow ÷ soil loading rateAuthority field-line table per bedroom
Authority field line per bedroom	0 in	Stored inactive value — not used by the current field sizing route
Authority minimum field line	0 in	Stored inactive value — not used by the current field sizing route
Soil loading rate	0.6 gal/day/ft²	Active field sizing route
Soil / percolation basis verified	No	Dependent field calculations are held
Soil / percolation reference	Not entered	Record the report, table row or approving-authority basis
Credited trench width	3 ft	Current project value
Maximum trench length	100 ft	Current project value
Clear spacing between trenches	6 ft	Current project value
Trench length rounding increment	1 ft	Stored calculation input; included even when not exposed by the current screen controls
Replacement-area allowance	100%	Current project value
Entered usable treatment area	0 ft²	Not entered — area check is held

Site constraints and separation inputs

Field	Recorded value	Use / status
Trench-bottom depth	2 ft	Current project value
Seasonal high-water depth	0 in	Unknown
Restrictive-layer depth	0 in	Unknown
Required groundwater separation	3 ft	Current project value
Required restrictive-layer separation	3 ft	Current project value
Restrictive-layer rule is strictly greater than	No	Pass allows ≥ entered separation
Entered site slope	5%	Current project value
Maximum permitted slope	15%	Current project value
Maximum-slope rule is strictly less than	No	Pass allows ≤ entered maximum

Conveyance, pipe and fall inputs

Field	Recorded value	Use / status
Building-to-tank run	50 ft	Current project value
Tank-to-field run	30 ft	Current project value
Continuous-material allowance	10%	Current project value
Building sewer slope	2%	Current project value
Tank-to-field conveyance slope	1%	Current project value
Field lateral slope	0.2%	Current project value
Building sewer diameter	4 in	Current project value
Tank outlet / conveyance diameter	4 in	Current project value
Field lateral pipe diameter	4 in	Current project value

Tank internals and drainfield assembly inputs

Field	Recorded value	Use / status
Inlet baffle above liquid	6 in	Current project value
Inlet baffle below liquid	6 in	Current project value
Baffle vent clearance	2 in	Current project value
Outlet baffle above liquid	6 in	Current project value
Outlet baffle submergence	40% of liquid depth	Current project value
Serviceable effluent filter selected	Yes	Current project value
Primary compartment share	66.67%	Current project value
Aggregate below pipe	6 in	Current project value
Aggregate above pipe	2 in	Current project value
Minimum aggregate size	0.5 in	Current project value
Maximum aggregate size	2.5 in	Current project value
Crowned overfill height	5 in	Current project value

Rough site plan, setbacks and distribution inputs

Field	Recorded value	Use / status
Rough lot width	150 ft	Current project value
Rough lot depth	250 ft	Current project value
Rough building width	50 ft	Current project value
Rough building depth	40 ft	Current project value
Building setback placeholder	5 ft	Current project value
Well setback placeholder	50 ft	Current project value
Property-line setback placeholder	5 ft	Current project value
Surface-water setback placeholder	50 ft	Current project value
Distribution method	Gravity distribution	Selected distribution conceptAvailable choices: Gravity distributionPressure distribution
Timed dosing selected	No	Stored inactive setting for gravity distribution

Appendix B

Complete calculated-output register

Held and unknown results remain explicit; they are not converted to zero.

Load calculation outputs

Field	Recorded value	Use / status
Design population	12 people	Current project value
Equivalent bedrooms	8	Current project value
Occupancy-route flow	900 gal/day	Calculated route
Bedroom-route flow	1,200 gal/day	Calculated route
Daily design flow	1,200 gal/day	Governing load used downstream
Controlling load basis	8 bedrooms × allowance	Current project value
Overall calculation status	Site data needed	Current project value

Tank sizing and conceptual geometry outputs

Field	Recorded value	Use / status
Hydraulic storage route	2,400 gal	Used by selected method
Solids storage route	380.5 gal	Used by selected method
Selected-method calculated capacity	2,780.5 gal	hydraulic retention + solids storage
Tank method label	hydraulic retention + solids storage	Current project value
Capacity after entered minimum	2,780.5 gal	Current project value
Rounded nominal tank capacity	3,000 gal	Planning capacity only; approved product still required
Nominal selected-volume retention	2.183 days	Current project value
Conceptual inside length	14 ft 1.9 in	Geometric planning model — not structural/product dimensions
Conceptual inside width	5 ft 8 in	Geometric planning model — not structural/product dimensions
Conceptual total tank height	6 ft	Liquid depth + freeboard
Conceptual excavation depth	8 ft	Not for digging; approved exterior and elevations control
Approved exterior dimensions complete	No	Current project value

Absorption field and footprint outputs

Field	Recorded value	Use / status
Accepted field-sizing basis ready	No	Dependent field outputs are held
Required / derived trench-bottom area	Withheld — accepted soil or percolation basis required	Current project value
Required total trench length	Withheld	Current project value
Equal trench count	Withheld	Current project value
Length per trench	Withheld	Current project value
Provided total trench length	Withheld	Current project value
Provided trench-bottom area	Withheld	Current project value
Primary field envelope width	Withheld	Current project value
Primary field rectangular footprint	Withheld	Current project value
Replacement infiltrative area	Withheld	Current project value
Primary + reserve planning footprint	Withheld	Current project value
Buffered field envelope width	Withheld	Current project value
Buffered field envelope length	Withheld	Current project value

Site screening outputs

Field	Recorded value	Use / status
Calculated groundwater separation	Withheld — seasonal high-water depth unknown	Current project value
Groundwater separation check	Not determined	Current project value
Calculated restrictive-layer separation	Withheld — restrictive-layer depth unknown	Current project value
Restrictive-layer separation check	Not determined	Current project value
Slope check	Pass	Current project value
Available-area check	Not determined	Current project value
Rough lot area	37,500 ft²	Current project value
Rough building footprint	2,000 ft²	Current project value
Rotation-only rough field-envelope check	Not determined	Does not prove overall fit or account for every feature/setback

Pipe, tank-internal and relative elevation outputs

Field	Recorded value	Use / status
Building sewer fall	1 ft	Current project value
Tank-to-field conveyance fall	3.6 in	Current project value
Field lateral fall	Withheld	Current project value
Outlet baffle below liquid	2 ft	Current project value
Aggregate + pipe media package depth	12 in	Current project value
Soil cover above media package	1 ft	Current project value
Field pipe center depth	1 ft 4 in	Current project value
Relative drop at tank inlet	1 ft	Datum: building outlet = 0
Relative drop at tank outlet	1 ft 2 in	Datum: building outlet = 0
Relative drop at distribution point	1 ft 5.6 in	Datum: building outlet = 0
Relative drop at lateral end	1 ft 5.6 in	Datum: building outlet = 0

Earthwork and material-order calculation outputs

Field	Recorded value	Use / status
Primary trench cut envelope	Withheld	Current project value
Gross field media envelope	Withheld	Current project value
Rectangular soil-cover volume	Withheld	Current project value
Material allowance factor	1.1×	Current project value
Building sewer order length	55 ft	Current project value
Tank-to-field order length	33 ft	Current project value
Field lateral order length	Withheld	Current project value
Field pipe displacement	Withheld	Current project value
Net field aggregate volume	Withheld	Current project value
Field aggregate order volume	Withheld	Current project value
Pervious cover base area	Withheld	Current project value
Pervious cover order area	Withheld	Current project value
Triangular overfill volume	Withheld	Current project value
Total field cover placement	Withheld	Current project value
Approved-tank excavation depth	Withheld — approved exterior dimensions missing	Current project value
Approved-tank bedding envelope	Withheld — approved exterior dimensions missing	Current project value
Tank bedding order volume	Withheld — approved exterior dimensions missing	Current project value

Appendix C

Readiness, warnings and release holds

Current status: Site data needed

REVIEWNo local design profile selected

The displayed allowances are editable planning values. Enter the approving authority and replace every value that differs from its current rules.

REVIEWMultifamily classification

Apartment systems commonly require an engineered distribution design, special operating approval, or treatment beyond a conventional single-home system.

NOTEDrainfield result held

Confirm that the field-sizing basis comes from the required site/soil evaluation and the approving authority to release the field result.

REVIEWApproved tank dimensions not attached

The calculated tank envelope is conceptual. Enter the selected manufacturer's approved exterior dimensions before relying on the detailed planning view for coordination.

Pre-excavation checklist status

No.	Requirement	Recorded status
01	Local construction and operating permits approved	Not checked
02	Qualified soil profile and seasonal groundwater evaluation complete	Not checked
03	Utilities located and excavation safety plan in place	Not checked
04	Listed tank, structural rating and manufacturer instructions approved	Not checked
05	Watertightness, tees, filter, risers and secure lids inspected	Not checked
06	Distribution elevations and equal loading field-verified	Not checked
07	Primary and reserve areas protected from traffic and compaction	Not checked
08	Inspection completed before cover; as-built and maintenance plan issued	Not checked

Appendix D

Complete customer and pricing record

Draft budget estimate. Load the current takeoff to freeze design quantities before entering customer prices.

Provider and customer record

Field	Recorded value	Use / status
Business name	Not entered	Current project value
Business address	Not entered	Current project value
Business phone	Not entered	Current project value
Business email	Not entered	Current project value
License / registration	Not entered	Current project value
Customer name	Not entered	Current project value
Customer billing address	Not entered	Current project value
Customer phone	Not entered	Current project value
Customer email	Not entered	Current project value
Service address	Not entered	Current project value

Quote settings and full text

Field	Recorded value	Use / status
Quote number	SOF-001	Current project value
Issue date	Not entered	Current project value
Valid through	Not entered	Current project value
Pricing mode	blank	Draft budget estimateAvailable choices: BlankDemoPublic-price testConfirmed custom rates
Design snapshot	Not captured	Current fingerprint status
Scope summary	Not entered	Current project value
Customer note	Not entered	Current project value
Markup	10%	Current project value
Sales tax	0%	Tax treatment not confirmed
Markup taxable	No	Current project value
Requested deposit	30%	Current project value
Terms	Work begins only after approved plans and permits, utility locating, site access, material availability and signed acceptance. Payment schedule, warranty and start date are subject to the contractor’s final written agreement.	Current project value
Exclusions	Unless separately priced above: engineering and survey services; soil or percolation testing; rock, groundwater, unsuitable soil or hazardous material; utility relocation; pressure-system hydraulic or electrical design; imported fill; haul-off; and authority-directed changes.	Current project value

All quote lines — included, excluded and TBD

Status	Item, scope and source	Quantity	Unit rate	Tax	Extension	Hold / verification
No quote lines have been loaded.

Quote calculation totals

Included line count: 0
Priced line count: 0
Included lines still TBD: 0
Line-item subtotal: $0.00
Taxable line subtotal: $0.00
Overhead and profit: $0.00
Taxable markup: $0.00
Tax base: $0.00
Sales tax: $0.00
Total: $0.00
Requested deposit: $0.00
Balance after deposit: $0.00

Appendix E

Samples, assumptions and source register

URLs are printed in full so the PDF remains auditable even when links are not clickable.

No source-based sample is attached to this project.

No public-price sources are attached to the current quote.

Guidance and safety links shown by the app

EPA OWTS manualshttps://www.epa.gov/septic/onsite-wastewater-treatment-and-disposal-systems
EPA permits and siting FAQhttps://www.epa.gov/septic/frequent-questions-septic-systems
EPA large-capacity systemshttps://www.epa.gov/uic/large-capacity-septic-systems
Kansas KDHE Bulletin 4-2https://www.kdhe.ks.gov/DocumentCenter/View/8770/Bulletin-4-2-Minimum-Standards-for-Design-and-Construction-of-Onsite-Wastewater-Systems-PDF
Louisiana tank and field ruleshttps://ldh.la.gov/assets/oph/Center-EH/sanitarian/onsitewastewater/8145.pdf
Louisiana setbackshttps://ldh.la.gov/assets/oph/Center-EH/sanitarian/onsitewastewater/2896.pdf
Louisiana permits and inspectionshttps://ldh.la.gov/bureau-of-sanitarian-services/permit-application-information
OSHA excavation requirementshttps://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.651
Washington design ruleshttps://app.leg.wa.gov/wac/default.aspx?cite=246-272A-0230

Concept diagrams

Tank and field arrangement

Not to scale · not structural drawings

Tank planTwo-compartment concept

3,000 gal

Inlet

Primary · 67%Access

Secondary · 33%Filter

Outlet

Concept length: 14.2 ft
Concept width: 5.7 ft
First chamber: 9.4 ft
Second chamber: 4.7 ft

Tank sectionBurial and liquid envelope

manufacturer approval required

Finished grade

Freeboard

Liquid working zone

Sludge storage

Liquid depth: 5 ft
Freeboard: 1 ft
Soil cover: 1.5 ft
Concept vertical stack: 8 ft · not a dig depth

Field planSoil verification required

gravity distribution

Result intentionally withheldConfirm a qualified loading rate in section 02.

Primary footprint: —
Approx. field width: —
Line length: —
Reserve: 100%

Preliminary annotated detailFor planning and coordination—not direct construction.

Attach the approved tank submittal, parish or authority plan, soil report, survey elevations and any pressure-distribution design before installation. Wall and lid thickness, reinforcement, burial and traffic rating, anchoring, penetrations and proprietary fittings are intentionally not invented here. Edit the detailed callouts.

Measurement basisCalculated conceptEditable planningUser / site inputApproved plan requiredEditable planning inputs · verify local rules

Detail 01 · Tank planConnections, chambers and access

submittal dimensions pending

Nominal liquid capacity: 3,000 gal calculated
Approved exterior L × W: TBD · tank submittal approved plan
Concept internal L × W: 14 ft 1.9 in × 5 ft 8 in not exterior
Primary chamber length: 9 ft 5.3 in planning
Secondary chamber length: 4 ft 8.6 in planning
Access opening: 2 ft diameter Editable planning
Partition transfer opening: TBD · selected tank design approved plan

Detail 02 · Tank sectionInverts, tees, liquid and burial

section through inlet and outlet

Approved exterior height: TBD · tank submittal approved plan
Concept internal height: 6 ft liquid + freeboard
Inlet / outlet pipe: 4 in / 4 in Editable planning
Inlet above outlet invert: 2 in Editable planning
Inlet tee above / below liquid: 6 in / 6 in Editable planning
Vent clearance above inlet tee: 2 in minimum Editable planning
Outlet tee above / below liquid: 6 in / 2 ft (40%) Editable planning
Filter at outlet: Included in concept verify approval
Soil cover / bedding: 1 ft 6 in / 6 in user input
Wall, lid, reinforcement and load: TBD · no calculated substitute structural submittal

Detail 03 · Trench sectionPipe, aggregate, cover and spacing

field sizing withheld

Trench width × bottom depth: 3 ft × 2 ft Editable planning
Field pipe / lateral grade: 4 in / 0.2% Editable planning
Fall along each proposed run: Withheld pending field basis calculated
Aggregate below / above pipe: 6 in / 2 in Editable planning
Aggregate size range: 0.5 in–2.5 in Editable planning
Derived pervious soil cover: 1 ft from section inputs
Pipe center below grade: 1 ft 4 in calculated
Centerline spacing: 9 ft Editable planning
Run count × length: Withheld pending site basis calculated
Perforations / D-box detail: TBD · local approved plan not specified here

Construction hold points

Details that must be attached before installation

01Manufacturer structural drawing

Exterior dimensions, wall and lid thickness, reinforcement, loading, burial limits, anchoring, joints, risers and seals.

02Approved site plan and survey

Final tank, field and reserve locations; setbacks; inlet, outlet, D-box and trench invert elevations; finished grades.

03Soil and field design

Accepted percolation or soil morphology basis, seasonal groundwater, restrictive layers, trench elevations and site protection.

04Distribution and product details

D-box leveling, approved pipe and media, perforations, fittings, filter service access and inspection requirements.

05Pressure-system hydraulics, if used

Pump curve, dose volume, storage, lateral layout, orifice size and spacing, controls, alarms and electrical design.

Conceptual full-site sketchRough arrangement—not a survey, permit plan or construction layout.

Component positions and orientation are schematic even when a length is annotated. Confirm parcel bearings, easements, contours, utilities, setbacks and exact coordinates on the approved site plan. Edit the rough lot and building dimensions.

Full system planBuilding, treatment train, drainfield and reserve area

diagrammatic · not to scale

On a small screen, scroll sideways to inspect the complete sketch.

Rough property boundary · replace with survey

Lot width 150 ft

Lot depth 250 ft

Norientation assumed

Assumed road / access edge

Driveway placeholder

Rough multifamily building50 ft × 40 ft · illustrative

Unit group AUnit group BUnit group CUnit group DCommon / circulationPlumbing / service core

COcleanout

Sewer 50 ft · 4 in

Septic tank3,000 gal

Ffilter

Conveyance 30 ft

D-boxlevel outlets

Primary drainfieldsize withheld

Soil basis required

Reserve / replacement field100% planning reserve

No traffic / compaction over treatment area

Entered planning setbacksBuilding 5 ftWell 50 ftProperty 5 ftSurface water 50 ft

Unlocated survey featuresWell · water lines · surface water · utilities · easements

01Building plumbingFixtures discharge to the exterior building sewer.
02Cleanout and sewerFinal route, grade and invert elevations require survey control.
03Septic tankSettling, digestion and serviceable outlet protection.
04D-box distributionLevel outlets divide flow among trenches.
05Soil treatment fieldPrimary runs disperse effluent into approved receiving soil.

Rough lot envelope: 150 ft × 250 ft · 37,500 ft² user input
Rough building footprint: 50 ft × 40 ft · 2,000 ft² illustrative
House / building layout: 4 apartments · 8 design bedrooms replace with floor plan
Building sewer: 4 in pipe · 50 ft run · 2% entered grade survey inverts
Tank footprint: 14 ft 1.9 in × 5 ft 8 in internal concept not exterior
Distribution: Gravity to level D-box and equal trenches field verify
Primary field: Withheld pending verified field basis calculated concept
Field envelope alone: Awaiting verified field basis not overall site fit
Reserve area: 100% planning reserve location schematic
Survey features not located: Well, water lines, surface water, utilities, easements, exact driveway and parcel orientation survey required

Construction coordination worksheetNot released for excavation.

Use this view to coordinate work limits, relative falls and inspection holds. Do not stake or dig from it alone: approved plans, survey coordinates, utility locations, product instructions and an excavation safety plan still control the work.

Calculated geometryEntered planning inputTBD / release hold

Blueprint 01 · excavation planWork corridors, dig zones and protected soil

diagrammatic · survey coordinates TBD

On a small screen, scroll sideways to inspect the complete work-zone plan.

Approved stakeout boundary TBD

Building edgeoutlet stake TBD

01 · building sewer trench

02 · tank excavation work limit TBD

Tank pitproduct footprint required

03 · solid effluent-line trench

04 · D-box pitlevel outlets

05 · primary field · no equipmentfield excavation withheldAccepted soil / percolation basis required

Reserve area · no digprotect from traffic, storage and compaction

Controlled equipment route

Proposed spoil / material stagingfinal location by contractor · outside treatment soil

STOPutilities and easements unlocated

Pit clearance, access, side slopes, shoring and shielding are not calculated.

Sewer corridor: 50 ft entered route; trench width, cover and start invert TBD Input + hold
Tank work limit: Approved exterior dimensions and contractor clearance required TBD / contractor
Primary trench limits: Withheld pending accepted field basis Calculated
Equipment and spoil: Keep access and storage out of primary and reserve areas; OSHA requires material/equipment control at excavation edges Competent person

Blueprint 02 · depth sectionsTank vertical stack and conventional field trench

entered dimensions · not surveyed elevations

Finished grade · field verify

Tank excavation stack

Entered cover 1 ft 6 in

Tank exterior TBDmanufacturer drawing required

Bedding 6 in

Vertical excavation stackTBD · approved height requiredactual dig depth requires surveyed grade and manufacturer limits

Protection system and working clearance by the contractor's competent person

Field trench section

Overfill 5 in

Pervious soil 1 ft

2 in aggregate above

4 in perforated pipe

6 in aggregate below

Level bottom · 2 ft below grade

Width 3 ft

Absolute trench-bottom elevation: approved-plan stakeout TBD

Tank vertical stack: Withheld until all approved exterior dimensions are entered Manufacturer hold
Tank pit plan size: TBD · exterior footprint, over-excavation, working clearance and protective system Contractor hold
Field trench bottom: Withheld pending accepted field basis Entered / derived
Ground conditions: Seasonal groundwater depth not entered; restrictive layer not entered Soil approval

Where and how deep

Dig and protection schedule

Coordinates remain survey TBD

Preliminary excavation locations, dimensions and release conditions
Work item	Location / limit	Depth or grade	Release condition
01 · Building sewer	Building outlet to tank inlet · 50 ft entered run	2% entered slope · theoretical fall 1 ft; burial depth TBD	Survey inverts + utility locate
02 · Tank excavation	Tank exterior and pit limit TBD	TBD · approved tank height required	Product + competent person
03 · Effluent conveyance	Tank outlet to D-box · 30 ft	1% entered grade · theoretical fall 3.6 in	Approved profile
04 · Distribution component	Level D-box with equal outlets	Product elevations and excavation TBD	Product / hydraulic design
05 · Primary trenches	Limits withheld pending accepted field basis	Withheld	Soil / authority hold
Reserve field	100% planning reserve	No excavation · protect receiving soil	Stake no-traffic zone

Elevation control

Relative fall worksheet

0.00 is arbitrary · cannot be staked

Theoretical pipe fall relative to an arbitrary building outlet datum
Station	Relative drop below 0.00	Basis	Status
Building outlet	0.00 assumed datum	Actual benchmark and invert not entered	Reference only
Tank inlet	1 ft	Building run × entered pipe slope	Theoretical
Tank outlet	1 ft 2 in	Tank inlet plus entered 2 in invert drop	Theoretical
D-box inlet	1 ft 5.6 in	Conveyance run × entered slope	Theoretical
End of field lateral	1 ft 5.6 in	Separate lateral fall added for worksheet only	Theoretical
Actual elevations	All stations TBD	Approved survey benchmark, finished grades and field stakeout	Survey hold

Preliminary takeoff

Geometric earthwork envelopes

Not purchase, haul or disposal quantities

Calculated geometric envelopes and quantity exclusions
Item	Worksheet result	Excluded from result	Status
Primary trench cut	Withheld	Swell, unstable material, over-excavation and trimming	Soil hold
Field media package	Withheld	Voids, pipe displacement, waste and supplier conversion	Soil hold
Pervious soil cover	Withheld	Overfill, compaction, unsuitable native soil and grading	Soil hold
Tank bedding envelope	TBD	Working clearance, product shaping and waste	Product hold
Tank / pipe trench cuts	TBD	Width, average depth, protection system and dewatering not modeled	Contractor takeoff
Import / export	TBD	Material suitability, spoil swell, compaction and disposal	Field decision

Construction activities

Sequence and release holds

Stop whenever field conditions differ from the approved plan.

01 · HOLDRelease documents
Obtain the approved permit plan, accepted soil report, tank submittal, installer authorization and inspection contacts.
02 · HOLDLocate and stake
Mark utilities, easements, setbacks, building outlet, tank, distribution component, primary field, reserve field and protected routes.
03 · SAFETYPlan excavation
A competent person selects protective systems, access, dewatering, edge protection and daily inspection controls. Keep spoils and equipment at least 2 ft from excavation edges unless retained.
04 · HOLDSet tank and piping
Confirm bearing, bedding, level, orientation, watertight joints, access, inlet/outlet inverts and manufacturer burial limits before tank backfill.
05 · HOLDBuild the field
Protect undisturbed soil; verify trench bottoms, media, pipe, D-box or manifold and equal distribution before any cover.
06 · INSPECTAuthority release
Complete the approving authority’s required inspection before covering components.
07 · CLOSEOUTBackfill and record
Use approved material and methods, preserve access, establish drainage, protect treatment soil, record as-built locations and issue the maintenance plan.

Preliminary takeoff

Construction materials estimate

Calculated from the current pipe runs, tank selection target and field geometry. Supplier units and final product counts still require approval.

PLANNING ESTIMATEDrainfield material quantities are withheld until the soil / percolation basis is accepted.

Not a quote, purchase order, hydraulic design, permit plan or excavation release. Verify against the approved permit plan, tank and distribution submittals, supplier units, installer takeoff and actual field conditions.

Planning allowance10%editable · continuous materials only

Building sewer pipe55 ft4 in · rounded order length

Field lateral pipeWithheldsoil / percolation basis required

Drainfield aggregateWithheldnet rectangular envelope · no supplier tonnage

Calculated geometry from current inputs; no waste addedPlanning allowance calculated base plus the disclosed allowanceSelected product count or specification comes from an approved productVerify on site route, fit or field condition controls the countWithheld required design input or approval is missing

Scroll sideways to review the full material schedule.

Planning material schedule. “Estimated amount” is rounded to the displayed order unit where a defensible continuous-material quantity is available.
Category	Material / component	Installed design quantity	Estimated amount	Quantity basis	Order / field note
Treatment	Approved septic tank systemNominal liquid capacity at least 3,000 gal; two-compartment planning basis	3,000 gal minimum nominal capacity	Model and unit count TBD	Selected product	Select listed product(s); manufacturer and authority control tank count, construction, burial, loading and included accessories.
Treatment	Access risers and secure lidsTwo compartment-access locations; entered clear opening 2 ft	2 access locations	Assemblies / included accessories TBD	Selected product	Riser heights, seals, lid load rating and whether the tank includes them come from the approved submittal.
Treatment	Inlet and outlet tee / baffle assembliesInlet +6 in / −6 in; outlet +6 in / −2 ft	1 inlet + 1 outlet location	Tank-integral or field-supplied · TBD	Selected product	Verify the approved tank package before buying separate fittings to avoid a duplicate count.
Treatment	Serviceable effluent filterSelected planning option at tank outlet	1 selected location	1 unit or tank-included component	Selected product	Confirm approval, flow rating, service clearance and whether it is included with the tank.
Conveyance	Building sewer pipe4 in solid pipe; class, joints and burial per approved plan	50 ft entered run	55 ft	Planning allowance	10% added for planning; route, stock lengths, cleanouts, fittings and surveyed elevations still control the order.
Conveyance	Solid tank-to-distribution pipe4 in solid pipe; final class and joints per approved plan	30 ft entered run	33 ft	Planning allowance	10% planning allowance; verify distribution-component location and all fittings.
Distribution	Gravity distribution componentLevel distribution box or other authority-approved equal-distribution detail	1 planning location · outlet count withheld	1 selected component · fittings TBD	Selected product	The authority may require a distribution box or another approved method; product, outlet seals and elevation controls are not selected.
Drainfield	Perforated field lateral pipe4 in perforated pipe; layout withheld	Withheld	TBD	Withheld	Accepted soil / percolation basis is required before field materials are released.
Drainfield	Lateral ends, inspection ports and connectionsCaps, ports, adapters, seals and flow-leveling parts per approved distribution detail	TBD	Exact fittings and counts TBD	Verify on site	Product geometry, stock lengths, cleanout detail and approved distribution method control the takeoff.
Drainfield	Approved clean aggregate0.5 in–2.5 in entered size range; full-width rectangular media envelope less pipe displacement	Withheld	Withheld	Withheld	Accepted soil / percolation basis and field geometry are required before estimating media.
Drainfield	Permit-approved pervious cover materialPlaced over aggregate; product type, roll width, laps and edge detail require approval	Withheld	Withheld	Withheld	10% is a planning allowance only; verify that the selected paper, fabric or other pervious barrier is accepted locally.
Earthwork	Suitable pervious soil cover and overfillRectangular cover plus a transparent triangular 5 in crown approximation	Withheld	Withheld	Withheld	This is not an imported-soil order. Reusable native soil, suitability, shrink/swell, compaction and final grading require field decisions.
Earthwork	Primary trench excavationField geometry withheld	Withheld	Withheld	Withheld	No allowance for swell, over-excavation, unstable soil, dewatering, spoil haul-off, trench protection or contractor means and methods.
Earthwork	Tank bedding materialApproved tank exterior dimensions are not entered	TBD	Withheld	Withheld	Select the approved tank and enter its exterior dimensions before estimating bedding.
Accessories	Cleanouts, couplings, flexible boots, adapters and sealantsWatertight compatible components at each approved connection and change in direction	TBD from routed plan and selected products	Contractor / product takeoff	Verify on site	Exact count depends on pipe stock lengths, route, tank openings, distribution product and local cleanout requirements.
Site work	Safety, dewatering, erosion control and restoration materialsProtective systems, pumps, barriers, stabilization, topsoil and seed as site conditions require	TBD after utility locating and field assessment	Site-specific contractor takeoff	Verify on site	A competent person, permit documents and actual groundwater / soil conditions determine these materials.
Protected reserve	Replacement-area materialsReserve area withheld	0 installed in the current concept	No pipe or media included	Withheld	The reserve is protected soil, not a second field material order, unless an approved phased construction plan explicitly requires it.

Excluded from automatic ordering:tank construction and reinforcing; exact riser and fitting counts; anchoring and buoyancy controls; pressure-system pumps, storage, valves, controls and electrical work; shoring, dewatering, imported fill, spoil haul-off, labor, equipment and pricing. Aggregate weight is intentionally not converted to tons without a supplier bulk density.

Customer pricing

Build a customer quotation

Freeze the current design quantities, enter your own rates, then print or save a customer-facing proposal. Blank costs stay visible as TBD.

Draft budget estimateLoad the current takeoff to freeze design quantities before entering customer prices.

No takeoff snapshotPrices not enteredTax not confirmedDesign hold remainsAll included items priced

Customer and price data stay in this browser or desktop app. They are also included when you export the project JSON, so protect that file. Demo rates are invented. Public-price test rates are dated listings and official public inputs—not averages, bids or installed contractor prices.

Your business

Business name *PhoneEmailLicense / registrationBusiness address

Customer and job site

Customer name *PhoneEmailBilling addressService address *

Quote details

Quote number *Issue date *Valid through *Scope summaryCustomer note

Pricing settings

Overhead & profit markup (%)Sales tax (%)Deposit (%)

Apply tax proportionally to markup on taxable linesI confirmed which lines are taxable and the applicable rate for this contract.

Tax defaults to 0%. SOF does not infer Louisiana or local tax treatment; select taxable lines and enter a rate only after confirming how your contract is treated.

Line items

No pricing lines yet.Load the current takeoff to copy calculated quantities without parsing display text.

Terms and exclusions

TermsExclusions

SOF quotation

Your business name

Business address not entered
Contact details not entered

Budget estimateSOF-001Draft budget estimate

Issue date: Not entered
Valid through: Not entered
Project: Apartment wastewater concept
Design snapshot: Not captured

Prepared forCustomer name not entered

Billing address not entered
Customer contact not entered

Service addressService address not entered

Approving authority not entered

Proposed scope

Scope summary not entered.

Description	Qty	Unit	Rate	Amount
No included line items. Load the current takeoff or add a custom item.

All included items have a price.Displayed totals include priced items only. Excluded rows do not appear.

Line-item subtotal: $0.00
Overhead & profit (10%): $0.00
Sales tax (0%): $0.00
Quote total: $0.00
Requested deposit (30%): $0.00
Balance after deposit: $0.00

Terms

Work begins only after approved plans and permits, utility locating, site access, material availability and signed acceptance. Payment schedule, warranty and start date are subject to the contractor’s final written agreement.

Exclusions

Unless separately priced above: engineering and survey services; soil or percolation testing; rock, groundwater, unsuitable soil or hazardous material; utility relocation; pressure-system hydraulic or electrical design; imported fill; haul-off; and authority-directed changes.

I authorize the listed scope and acknowledge the terms, exclusions, price and payment schedule, subject to the contractor’s final agreement.

Customer signatureDate

Contractor signatureDate

Field handoff

Installation parameter schedule

Verify every authority and manufacturer value before construction

Parameter	Current concept	Basis	Status
Daily design flow	1,200 gal/day	8 bedrooms × allowance	Local check
Nominal tank capacity	3,000 gal	hydraulic retention + solids storage, rounded up	Approved tank needed
Approved tank exterior	Not entered	selected product submittal	Manufacturer hold
Compartments	2; first 67%, second 33%	editable planning configuration	Confirm approved tank
Access openings	At each compartment; entered diameter 2 ft	user-entered parameter	Manufacturer
Pipe sizes	building 4 in; outlet 4 in; lateral 4 in	Editable planning inputs · verify local rules	Authority / product
Tank tees / baffles	inlet +6 in / −6 in; outlet +6 in / −2 ft	current liquid level; outlet 40%	Authority / product
Effluent protection	Outlet tee/baffle; serviceable filter selected	editable planning concept	Authority check
Building sewer fall	1 ft over 50 ft	2% entered near-tank slope	Survey elevations
Field conveyance fall	0.3 ft over 30 ft	1% solid-line slope	Survey elevations
Field lateral assembly	4 in pipe at 0.2%; aggregate 6 in below / 2 in above	separate from solid conveyance grade	Inspect before cover
Distribution	Level distribution box to equal trenches	selected concept	Field verify
Primary field	Withheld	field basis not verified	Incomplete
Vertical separation	Groundwater unknown; restrictive layer unknown	entered depths minus trench bottom	Verify
Rough site-plan envelope	lot 150 ft × 250 ft; building 50 ft × 40 ft	editable diagram assumptions	Replace with survey
Field-envelope screen	Awaiting verified field basis	rotation-only rectangle screen; excludes building and reserve placement	Not overall fit
Setback placeholders	building 5; well 50; line 5; water 50 ft	user-entered local values	Plot on survey

Before excavation

A calculation is only one part of a safe system.

Protect the treatment soil, obtain approvals and require inspection before covering any component. Never enter a septic tank: toxic gases, oxygen deficiency and collapse can kill within minutes.

01Local construction and operating permits approved02Qualified soil profile and seasonal groundwater evaluation complete03Utilities located and excavation safety plan in place04Listed tank, structural rating and manufacturer instructions approved05Watertightness, tees, filter, risers and secure lids inspected06Distribution elevations and equal loading field-verified07Primary and reserve areas protected from traffic and compaction08Inspection completed before cover; as-built and maintenance plan issued