1

The following information will need to be gathered prior to applying online for building permits:

1. Applicant Information-name and contact information (phone, address, and email)

2. Site Information including all site addresses and the assessor’s tax parcel number

3. Name of project

4. Parcel area in square footage

5. Addition square footage

6. Total Building coverage (including sheds and detached garages), existing and proposed square footage

7. Total Projected Roof Area

8. Total Impervious surfaces – existing and proposed in square feet

9. Total Hard Surfaces - existing and proposed in square feet. Hard surfaces are an impervious surface, a

permeable pavement, or a vegetated roof. All these categories added together equal the total hard surfaces.

The following documents meeting the Document Submission Standards (see handout for information) will need to be uploaded within two (2) business days of completing the online application. Failure to do so will result in cancellation of the permit application.

1. Architectural Plans

2. Site Plan

3. Structural Calculations

4. Engineered Structural Drawings

5. Engineered Truss Drawings

6. Energy Code Compliance (WESC forms)

7. Abbreviated Drainage Plan

MINIMUM REQUIREMENTS FOR SINGLE FAMILY RESIDENTIAL PLOT PLAN SUBMITTAL FOR BUILDING PERMITS – See Sample Below

Show lot lines, dimensions and lot area in square feet. Utilities (water, sewer, storm, franchise) existing and proposed. Easements and tracts Setback distance in feet to lot lines from building walls. Building footprint with roof overhangs and chimney/mechanical pop-outs. Provide footprint area in square feet. Driveway and sidewalks locations and area in square feet. Porches, patios and decks with area in square feet. Street names Actual finish floor elevations above mean sea level in vertical datum NAVD88 Property corners and curbline elevations - NAVD88 Proposed and existing contour lines Drainage (swales, infiltration trenches, footing and roof drain, yard or perimeter drain line, areas of compost-amended

soils, etc.) Calculations for infiltration trenches, attach table Indicate soil type (A, B, C or D)

RESIDENTIAL BUILDING PERMIT CHECKLIST NEW CONSTRUCTION, ADDITIONS AND GARAGES

2

Retaining walls with top and bottom wall elevations – NAVD88. (Retaining walls over 4’ tall require separate building permit.)

Existing and proposed surface drainage flows through site North arrow Scale and dimensions. Preferred scale is 1” = 20’ Wells and septic onsite and on adjacent properties Trees – preserved and new, with tree protection fencing shown, from Soil and Vegetation Plan. Show locations on plans of critical areas (steep slopes, creeks, wetlands) Show all erosion control items (construction entrance, erosion control fence, sediment pond, etc.) from Drainage Plan. Show required frontage improvements in the public right-of-way (sidewalk, driveway). Total hard surface greater than 2,000 sq. ft. and less than 5,000 sq. ft., submit Abbreviated Drainage Plan. Total hard surface greater than 5,000 sq. ft., submit Drainage Control Plan.

RESIDENTIAL APPLICATION CHECKLIST

Completed permit application(s): Building Electrical Mechanical Plumbing

Climatic and geographic design criteria (soil-bearing capacity, seismic category, ult. wind speed, roof snow load, etc.)

Combined plan set. All documents correctly oriented to building site

Plans created and formatted in PDF. 36”x 24” preferred. See PDF guide in Permit Portal Documents

Plan dimensions and scale provided. ¼’ = 1’ preferred, 1/8” = 1’ minimum Foundation plans

Floor plans, with summary of area in square feet (all levels)

Elevations (all sides)

Floor framing plan (all levels)

Wall bracing plan (for prescriptive code design)

Roof framing plan

Building/assembly cross-section (components labeled)

Construction details (referenced to plan)

Stamped engineered structural drawings (required if not designed by prescriptive code)

Stamped structural calculations report (required if not designed by prescriptive code)

3

Engineered truss drawings

Engineered floor manufacturer’s layout (if applicable)

Washington State Residential Energy Code compliance worksheets and plan

Whole-house mechanical ventilation compliance plan

Site plans/erosion control plan (use site plan checklist)

Construction Stormwater Pollution Prevention Plan (See Volume II, Chapter 3 of the City of Olympia

Drainage Design and Erosion Control Manual Stormwater Review Total hard surface greater than 2,000 sq. ft. and less than 5,000 sq. ft., submit Abbreviated Drainage Plan. Total hard surface greater than 5,000 sq. ft., submit Drainage Control Plan. Land disturbing activities greater than 7,000 sq. ft., submit Abbreviated Drainage Storm Plan. A Soil and Vegetation Plan Supplement, as outlined in OMC 16.60 and the Urban Forestry Manual.

Other Requirements

If the property is listed on a Historic Register or District: Exterior photographs if the exterior changes proposed, photographs of adjacent or abutting structures, statement of the date of construction of the structure, and description and basis of any code exceptions sought due to historic nature of structure.

If within the Downtown area or Design Review District, or if the project includes attached housing units, manufactured housing, single-family housing on a lot of less than 5,000 square feet, an accessory dwelling unit, cottage or co-housing, or abutting or across the street from a Design Review District, a Detailed Design Review Supplement is required. (See OMC 18.100.)

Critical area reports may be required if the project is within 300 feet of the following critical areas - wetland, stream, landslide hazard area, frequently flooded area, or critical aquifer recharge area; or within 1,000 feet of an important habitat and species area. Please contact a planner for more information at: CPDInfo@ci.olympia.wa.us.

Model Soil Management Plan (typically included in the stormwater drainage plan.)

Elevation certificate if in FEMA Flood Zone; Minimum floor elevation for Sea Level Rise zones

Permit fees and plan check fees are calculated based on ICC published actual construction cost per OMC 4.36.010.4. A Technology Fee of 3.9% is applied to all Land Use, Engineering and Building permit & plan review fees.

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/Setbacks

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

Impervious Surface Area:House Area = 1.960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Building Coverage:Existing Footprint = 0

New/Additional Footprint = +1,9601,960

Lot Area = 16,000

1960÷ 16,000

Building Coverage = 12.3%

eave/roof overhang

129'

Deck

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

127'

126'

125'

ANY AVENUE NE

AN

Y S

TR

EE

T N

E

124'

Seaso

nal

Wet

land

90'

180'

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

36'

10'

72'

CommunityPlanning &

Development601 4th Ave E, Olympia, WA 98501

360.753.8314 [phone]cpdinfo@ci.olympia.wa.us [email]

SAMPLE RESIDENTIAL SITE PLAN

Site plan requirements areoutlined in the subsequent pages

Elevation/Topography

Critical Areas

Utilities & Rainwater

Building Coverage

Impervious Surface

Lot Dimensions/SetbacksPPP

Seasonal Stream

Driv

eway

Front YardSetback (ft)

Rear YardSetback (ft)

128'

129'

127'

126'

125'

124'

Seaso

nal

Wet

land

Building Coverage and Hard Surface Area (in sqft)

Dom

estic

Wat

er L

ine

Water Main

Sew

erLi

ne

Side YardSetback (ft)

Side YardSetback (ft)

- 55' to Hydrant

Prepared by: Alan Smith & Associates1234 Somewhere Ave SEOlympia, WA 98501(360)XXX-XXXX

Site Address: 1111 Any Ave. NE, Olympia, WA 98501Tax Parcel Number: 12345678910Legal Description: Lot 3 Block 5 Some Subdivision

*Note: This sample site plan is for informational use only and is not to be substituted for the Olympia Municipal Code. Other requirements not noted may be necessary or requested. 8/11/2020

Scale1" = 20'

PPP Building Footprint

Hard Surface Area:House Roof Area = 2,500

Driveway/Sidewalk/Paths/Patios = +260Deck = +252

3,012

3,012÷ 16,000

Hard Surface Area = 18.8%

90'

180'

Lot Dimensions:Property dimensions as identified byThurston County Assessors office, orrecent survey.

Setbacks:When you build a structure, you need toposition your building on your lot so that itmeets City setback requirements.

Setbacks are intended to allow sufficientspace between buildings for fireprotection, to allow adequate yards, andto avoid nuisances for neighbors.

Scale & North Arrow:Lot lines, structures and other featuresmust be drawn to scale. North arrow fororientation.

Elevation/Topography:Every project is unique and so is the earthbeneath it.

Soil type, Ground conditions and stabilityare essential to determine whether theproperty is suitable for a particular type ofbuilding as well as the best place for thestructure to go.

Topography also has a large impact onjust how the soil is formed. Where does allthat rainwater go? How does that effectthe soil below? All of these details makeup the topographical picture of our homesand businesses.

*Note: The City of Olympia uses thevertical datum NAVD88.

Critical Areas:Critical Areas are environmentallysensitive areas that require specialprotections. Critical areas within theproperty boundaries will need to bedepicted on the site development plan. Insome instances critical areas may belocated off site but the buffer or requiredsetback may extend onto the propertybeing developed. These areas should beclearly shown on the site plan.

Olympia's Critical Areas Ordinance(CAO), OMC 18.32, is the primary set ofregulations on development that protectscritical areas. Other critical areas areaddressed in OMC 16.70, frequentlyflooded areas; OMC 18.20, marine andfreshwater shorelines as defined by theShoreline Management Act; and OMC13.16, erosion hazards.

Utilities:Properly identify all municipal and privateutilities including domestic water, sewer,natural gas, electric.

Rainwater Infiltration:Show the location of roof drainage and/orrainwater storage and infiltration systems.

Building Coverage:The portion of a lot covered by theprincipal and accessory building floor areaincluding all areas covered by aweather-tight roof, excluding two feet ofeaves.

Hard surface Area:The total area covered with impervioussurface, permeable pavement, walkways,patios, decks, gravel surfaces,mechanically compacted soils, orvegetated roofs, are all considered hardsurface. (In contrast with vegetatedpermeable soils)

Scale1" = 20'

Impervious Surface. A non-vegetatedsurface area which either prevents orretards the entry of water into the soilmantle as under natural conditions prior todevelopment. A non-vegetated surfacearea which causes water to run off thesurface in greater quantities or at anincreased rate of flow from the flowpresent under natural conditions prior todevelopment. Common impervioussurfaces include, but are not limited to,surface of all buildings (except two feet ofeaves), walkways, patios, driveways,parking lots or storage areas, concrete orasphalt paving, gravel roads, gravelparking lots, gravel pathways, packedearthen materials, and oiled, macadam orother surfaces which similarly impede thenatural infiltration of stormwater.

Hard Surface Area

Trees/Landscaping

PP

16" - DBHMaple

32" - DBHCedar

24" - DBHDouglas Fir

16" - DBHMaple

32" - DBHCedar

Driv

eway

Trees/Landscaping:All new residences are required to meet aminimum tree density by preservingexisting trees where feasible and/plantingnew tree units if needed. Olympia's Tree,Soil, and Native Vegetation Protectionand Replacement Ordinance - OMC 16.60offers more guidance.

How Do I Measure A Tree?Measure the diameter (not circumference)of each tree at 4.5 feet above the ground.This is called the diameter at breastheight (DBH) and is measured in inches.

24" - DBHDouglas Fir

Ele

ctric

ityE

lect

ricity

FFE:102.6' Impervious Surface Area:House Area = 1,960

Driveway/Sidewalk/Paths/Patios = +2602,220

2,220÷ 16,000

Impervious Surface Area = 13.9%Deck

Number of Stories = 1Building Height = 26'

Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88

Erosion & Sediment ControlSilt FenceSilt Fence

Erosion & Sediment Control:Erosion & sediment control measuresshould be clearly indicated on the siteplan. Show all control measures intendedto prevent sediment from being tracked offsite and control on-site erosion.

Best management practices (BMPs) mayinclude but not limited to: temporary andpermanent seeding, sodding, mulching,plastic covering, erosion control fabrics,silt fencing, dust control, sediment ponds,filters, etc.

Residential projects that create between2,000 and 5,000 square feet of new plusreplaced hard surface are requiredto prepare an Abbreviated Drainage Plan.For more information see the City ofOlympia's Drainage and Erosion ControlManual.

FFE:102.6'

P

Catch Basin

Infiltration Trench