SAMPLE RESIDENTIAL SITE PLAN

(1)

Existing Footprint = 0 New/Additional Footprint = +1,960 1,960 Lot Area = 16,000

1960

÷ 16,000 Building Coverage = 12.3%

Hard Surface Area:

House Roof Area = 2,500 Driveway/Sidewalk/Paths/Patios = +260 Deck = +252 3,012 3,012

÷ 16,000 Hard Surface Area = 18.8%

Impervious Surface Area:

House Area = 1.960 Driveway/Sidewalk/Paths/Patios = +260 2,220 2,220

÷ 16,000 Impervious Surface Area = 13.9%

Number of Stories = 1 Building Height = 26' Finished Floor Elevation* (FFE) = 102.6'

*Vertical Datum NAVD88 eave/roof overhang

129' Deck

Seasonal Stream

Driveway

Front Yard Setback (ft)

Rear Yard Setback (ft)

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

90'

180' Domestic Water Line Sewer

Line

Side Yard Setback (ft)

Side Yard

Setback (ft) 36'10'

72'

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Prepared by:

Alan Smith & Associates 1234 Somewhere Ave SE Olympia, WA 98501 (360)XXX-XXXX

*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

Scale 1" = 20' Hard Surface Area

Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

24" - DBH Douglas Fir

Electricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence

(2)

Building Coverage:

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

90' 180' Domestic Water Line

Water Main

Sewer

Line

- 55' to Hydrant

36'10'

72'

Site plan requirements are outlined in the subsequent pages

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks



_{Front Yard}

Setback (ft)

Building Coverage and Hard Surface Area (in sqft)

Prepared by:

Scale 1" = 20'

90'

180'

Lot Dimensions:

Property dimensions as identified by Thurston County Assessors office, or recent survey.

Setbacks:

When you build a structure, you need to position your building on your lot so that it meets City setback requirements.

Setbacks are intended to allow sufficient space between buildings for fire

protection, to allow adequate yards, and to avoid nuisances for neighbors.

Scale & North Arrow:

Lot lines, structures and other features must be drawn to scale. North arrow for orientation.

Scale 1" = 20' Hard Surface Area

Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

Electricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence

(3)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

90'

Line

Side Yard

Setback (ft) 36'10'

72'

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

P

128' 129'

127'

126'

125'

124'

Prepared by:

Scale 1" = 20'

Elevation/Topography:

Every project is unique and so is the earth beneath it.

Soil type, Ground conditions and stability are essential to determine whether the property is suitable for a particular type of building as well as the best place for the structure to go.

Topography also has a large impact on just how the soil is formed. Where does all that rainwater go? How does that effect the soil below? All of these details make up the topographical picture of our homes and businesses.

*Note: The City of Olympia uses the vertical datum NAVD88.

Hard Surface Area Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

Electricity

FFE:102.6'

*Vertical Datum NAVD88

Erosion & Sediment Control

Silt Fence

FFE:102.6'

(4)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

Water Main

Sewer

Line

- 55' to Hydrant

36'10'

72'

Site plan requirements are outlined in the subsequent pages

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

P

Seasonal Stream Seasonal

Wetland

Building Coverage and Hard Surface Area (in sqft)

Prepared by:

Scale 1" = 20'

Critical Areas:

Critical Areas are environmentally sensitive areas that require special protections. Critical areas within the property boundaries will need to be depicted on the site development plan. In some instances critical areas may be located off site but the buffer or required setback may extend onto the property being developed. These areas should be clearly shown on the site plan.

Olympia's Critical Areas Ordinance (CAO), OMC 18.32, is the primary set of regulations on development that protects critical areas. Other critical areas are addressed in OMC 16.70, frequently flooded areas; OMC 18.20, marine and freshwater shorelines as defined by the Shoreline Management Act; and OMC

Hard Surface Area Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

Electricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence

(5)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

90'

Line

Side Yard

Setback (ft) 36'10'

72'

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Domestic Water Line Sewer Line

Prepared by:

Scale 1" = 20'

P

Utilities:

Properly identify all municipal and private utilities including domestic water, sewer, natural gas, electric.

Rainwater Infiltration:

Show the location of roof drainage and/or rainwater storage and infiltration systems.

Hard Surface Area Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

ElectricityElectricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence

Catch Basin

Infiltration Trench

(6)

1960

*Vertical Datum NAVD88 Building Coverage:

1960

eave/roof overhang

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

Water Main

Sewer

Line

- 55' to Hydrant

36'10'

72'

Site plan requirements are outlined in the subsequent pages

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Building Coverage and Hard Surface Area (in sqft)

Prepared by:

Scale 1" = 20'

P

Building Footprint

The portion of a lot covered by the principal and accessory building floor area including all areas covered by a

weather-tight roof, excluding two feet of eaves.

Hard Surface Area Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

Electricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence

(7)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

90'

Line

Side Yard

Setback (ft) 36'10'

72'

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Prepared by:

Scale 1" = 20'

P

Impervious Surface. A non-vegetated surface area which either prevents or retards the entry of water into the soil mantle as under natural conditions prior to development. A non-vegetated surface area which causes water to run off the surface in greater quantities or at an increased rate of flow from the flow present under natural conditions prior to development. Common impervious surfaces include, but are not limited to, surface of all buildings (except two feet of eaves), walkways, patios, driveways, parking lots or storage areas, concrete or asphalt paving, gravel roads, gravel parking lots, gravel pathways, packed earthen materials, and oiled, macadam or other surfaces which similarly impede the natural infiltration of stormwater.

Hard Surface Area Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

Driveway

Electricity

FFE:102.6' Impervious Surface Area:

House Area = 1,960 Driveway/Sidewalk/Paths/Patios = +260 2,220 2,220

Erosion & Sediment Control

Silt Fence

(8)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

Water Main

Sewer

Line

- 55' to Hydrant

36'10'

72'

Site plan requirements are outlined in the subsequent pages

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Driveway

Building Coverage and Hard Surface Area (in sqft)

Prepared by:

Scale 1" = 20'

Hard surface Area:

The total area covered with impervious surface, permeable pavement, walkways, patios, decks, gravel surfaces,

mechanically compacted soils, or vegetated roofs, are all considered hard surface. (In contrast with vegetated permeable soils)

Hard Surface Area Trees/Landscaping

P

16" - DBH Maple

32" - DBH Cedar

Electricity

FFE:102.6'

Deck

Erosion & Sediment Control

Silt Fence

(9)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

90'

Line

Side Yard

Setback (ft) 36'10'

72'

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Prepared by:

Scale 1" = 20' Hard Surface Area

Trees/Landscaping

P

16" - DBH Maple

32" - DBH Cedar

24" - DBH Douglas Fir 16" - DBH

Maple

32" - DBH Cedar

Trees/Landscaping:

All new residences are required to meet a minimum tree density by preserving existing trees where feasible and/planting new tree units if needed. Olympia's Tree, Soil, and Native Vegetation Protection and Replacement Ordinance - OMC 16.60 offers 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 breast height (DBH) and is measured in inches.

Electricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence

(10)

1960

129' Deck

Seasonal Stream

Driveway

128'

127'

126'

125'

ANY STREET NE

124' Seasonal

Wetland

Water Main

Sewer

Line

- 55' to Hydrant

36'10'

72'

Site plan requirements are outlined in the subsequent pages

Elevation/Topography Critical Areas

Utilities & Rainwater Building Coverage Impervious Surface Lot Dimensions/Setbacks

Building Coverage and Hard Surface Area (in sqft)

Prepared by:

Scale 1" = 20' Hard Surface Area

Trees/Landscaping

16" - DBH Maple

32" - DBH Cedar

Electricity

FFE:102.6'

Erosion & Sediment Control

Silt Fence Silt Fence

Erosion & Sediment Control:

Erosion & sediment control measures should be clearly indicated on the site plan. Show all control measures intended to prevent sediment from being tracked off site and control on-site erosion.

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

Residential projects that create between 2,000 and 5,000 square feet of new plus replaced hard surface are required to prepare an Abbreviated Drainage Plan.

For more information see the City of Olympia's Drainage and Erosion Control