Mac

Arth

ur B

lvd

Crown Dr

Sea

Ln

San Miguel Dr

Gol

denr

od A

veAvoc

ado

Ave

Windover Dr

Surfl

ine

Way

Farallon Dr

Ports

ide

Way

Newpo

rt Cen

ter D

r

Whi

te S

ails

Way

Wavecrest Dr

Starbo

ard W

ay

Ebbtid

e Rd

Harbor Pointe Dr

Corporate Plaza Dr

Newp

ort C

ente

r Dr

177

134

173

162

418980

418980

419070

419070

419160

419160

419250

419250

419340

419340

419430

419430

3718

950

3718

950

3719

040

3719

040

3719

130

3719

130

3719

220

3719

220

3719

310

3719

310

3719

400

3719

400

3719

490

3719

490

3719

580

3719

580

3719

670

3719

670

0 200 400 600100Feet

0 70 140 21035Meters

33° 36' 51''

117°

52'

4''

33° 36' 25''

117°

52'

4''

33° 36' 25''

33° 36' 51''11

7° 5

2' 2

7''

117°

52'

27'

'

Map Scale: 1:3,810 if printed on A size (8.5" x 11") sheet.

Hydrologic Soil Group—Orange County and Part of Riverside County, California(Newport Beach City Hall)

Natural ResourcesNatural ResourcesNatural ResourcesNatural ResourcesConservation ServiceConservation ServiceConservation ServiceConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 1 of 4

MAP LEGEND MAP INFORMATION

Area of Interest (AOI)Area of Interest (AOI)

SoilsSoil Map Units

Soil RatingsA

A/D

B

B/D

C

C/D

D

Not rated or not available

Political FeaturesCities

Water FeaturesOceans

Streams and Canals

TransportationRails

Interstate Highways

US Routes

Major Roads

Local Roads

Map Scale: 1:3,810 if printed on A size (8.5" × 11") sheet.

The soil surveys that comprise your AOI were mapped at 1:24,000.

Please rely on the bar scale on each map sheet for accurate mapmeasurements.

Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL: http://websoilsurvey.nrcs.usda.govCoordinate System: UTM Zone 11N NAD83

This product is generated from the USDA-NRCS certified data as ofthe version date(s) listed below.

Soil Survey Area: Orange County and Part of Riverside County,CaliforniaSurvey Area Data: Version 5, Sep 10, 2008

Date(s) aerial images were photographed: 6/7/2005

The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundimagery displayed on these maps. As a result, some minor shiftingof map unit boundaries may be evident.

Hydrologic Soil Group–Orange County and Part of Riverside County, California(Newport Beach City Hall)

Natural ResourcesConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 2 of 4

Hydrologic Soil Group

Hydrologic Soil Group— Summary by Map Unit — Orange County and Part of Riverside County, California

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

134 CALLEGUAS CLAY LOAM, 50 TO75 PERCENT SLOPES,ERODED

D 7.3 43.6%

162 MARINA LOAMY SAND, 2 TO 9PERCENT SLOPES

B 0.6 3.5%

173 MYFORD SANDY LOAM, 2 TO 9PERCENT SLOPES

D 1.2 7.3%

177 MYFORD SANDY LOAM, 9 TO 30PERCENT SLOPES, ERODED

D 7.7 45.5%

Totals for Area of Interest 16.8 100.0%

Description

Hydrologic soil groups are based on estimates of runoff potential. Soils areassigned to one of four groups according to the rate of water infiltration when thesoils are not protected by vegetation, are thoroughly wet, and receive precipitationfrom long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) andthree dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughlywet. These consist mainly of deep, well drained to excessively drained sands orgravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. Theseconsist chiefly of moderately deep or deep, moderately well drained or well drainedsoils that have moderately fine texture to moderately coarse texture. These soilshave a moderate rate of water transmission.

Group C. Soils having a slow infiltration rate when thoroughly wet. These consistchiefly of soils having a layer that impedes the downward movement of water orsoils of moderately fine texture or fine texture. These soils have a slow rate of watertransmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) whenthoroughly wet. These consist chiefly of clays that have a high shrink-swellpotential, soils that have a high water table, soils that have a claypan or clay layerat or near the surface, and soils that are shallow over nearly impervious material.These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter isfor drained areas and the second is for undrained areas. Only the soils that in theirnatural condition are in group D are assigned to dual classes.

Hydrologic Soil Group–Orange County and Part of Riverside County, California Newport Beach City Hall

Natural ResourcesConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 3 of 4

Rating Options

Aggregation Method: Dominant Condition

Aggregation is the process by which a set of component attribute values is reducedto a single value that represents the map unit as a whole.

A map unit is typically composed of one or more "components". A component iseither some type of soil or some nonsoil entity, e.g., rock outcrop. For the attributebeing aggregated, the first step of the aggregation process is to derive one attributevalue for each of a map unit's components. From this set of component attributes,the next step of the aggregation process derives a single value that represents themap unit as a whole. Once a single value for each map unit is derived, a thematicmap for soil map units can be rendered. Aggregation must be done because, onany soil map, map units are delineated but components are not.

For each of a map unit's components, a corresponding percent composition isrecorded. A percent composition of 60 indicates that the corresponding componenttypically makes up approximately 60% of the map unit. Percent composition is acritical factor in some, but not all, aggregation methods.

The aggregation method "Dominant Condition" first groups like attribute values forthe components in a map unit. For each group, percent composition is set to thesum of the percent composition of all components participating in that group. Thesegroups now represent "conditions" rather than components. The attribute valueassociated with the group with the highest cumulative percent composition isreturned. If more than one group shares the highest cumulative percentcomposition, the corresponding "tie-break" rule determines which value should bereturned. The "tie-break" rule indicates whether the lower or higher group valueshould be returned in the case of a percent composition tie.

The result returned by this aggregation method represents the dominant conditionthroughout the map unit only when no tie has occurred.

Component Percent Cutoff: None Specified

Components whose percent composition is below the cutoff value will not beconsidered. If no cutoff value is specified, all components in the database will beconsidered. The data for some contrasting soils of minor extent may not be in thedatabase, and therefore are not considered.

Tie-break Rule: Lower

The tie-break rule indicates which value should be selected from a set of multiplecandidate values, or which value should be selected in the event of a percentcomposition tie.

Hydrologic Soil Group–Orange County and Part of Riverside County, California Newport Beach City Hall

Natural ResourcesConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 4 of 4

MacArth

ur Blvd

San Miguel Dr

Crown Dr

San Joaquin Hills R

d

Sea

LnFarallon Dr

Avoc

ado

Ave

Gol

denr

od A

ve

New

port

Cen

ter D

r

Blue Water D

r

Jasmine Creek Dr

Wavecrest Dr

Windover Dr

Anacapa D

r

Lighthouse Ln

Pacific View Dr

Island View D

r

Salt Air Cir

Surfl

ine

Way

Whi

te S

ails

Way

San Nicolas Dr

Portsid

e Way

Jetty Dr

Skys

ail D

r

Ebbt

ide

Rd

Maritime Dr

Atoll Dr

Harbor Woods Pl

Ald

erw

ood

Dr

Crest Cir

Starb

oard

Way

Harbor Pointe Dr

Seafaring Dr

Corporate Plaza Dr

Beach

comber

Dr

Cur

l Dr

Bayw

ood Dr

Sandp

oint W

ay

Newport Center Dr

Mac

Arth

ur B

lvd

173

177

134

162

162

134

418700

418700

418800

418800

418900

418900

419000

419000

419100

419100

419200

419200

419300

419300

419400

419400

419500

419500

419600

419600

419700

419700

419800

419800

419900

419900

420000

420000

420100

420100

3718

900

3718

900

3719

000

3719

000

3719

100

3719

100

3719

200

3719

200

3719

300

3719

300

3719

400

3719

400

3719

500

3719

500

3719

600

3719

600

3719

700

3719

700

3719

800

3719

800

0 700 1,400 2,100350Feet

0 100 200 30050Meters

33° 36' 54''

117°

51'

39'

'

33° 36' 23''

117°

51'

39'

'

33° 36' 23''

33° 36' 54''11

7° 5

2' 3

5''

117°

52'

35'

'

Map Scale: 1:6,910 if printed on A size (8.5" x 11") sheet.

Hydrologic Soil Group—Orange County and Part of Riverside County, California(Newport Beach City Hall Existing)

Natural ResourcesNatural ResourcesNatural ResourcesNatural ResourcesConservation ServiceConservation ServiceConservation ServiceConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 1 of 4

MAP LEGEND MAP INFORMATION

Area of Interest (AOI)Area of Interest (AOI)

SoilsSoil Map Units

Soil RatingsA

A/D

B

B/D

C

C/D

D

Not rated or not available

Political FeaturesCities

Water FeaturesOceans

Streams and Canals

TransportationRails

Interstate Highways

US Routes

Major Roads

Local Roads

Map Scale: 1:6,910 if printed on A size (8.5" × 11") sheet.

The soil surveys that comprise your AOI were mapped at 1:24,000.

Please rely on the bar scale on each map sheet for accurate mapmeasurements.

Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL: http://websoilsurvey.nrcs.usda.govCoordinate System: UTM Zone 11N NAD83

This product is generated from the USDA-NRCS certified data as ofthe version date(s) listed below.

Soil Survey Area: Orange County and Part of Riverside County,CaliforniaSurvey Area Data: Version 5, Sep 10, 2008

Date(s) aerial images were photographed: 6/7/2005

The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundimagery displayed on these maps. As a result, some minor shiftingof map unit boundaries may be evident.

Hydrologic Soil Group–Orange County and Part of Riverside County, California(Newport Beach City Hall Existing)

Natural ResourcesConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 2 of 4

Hydrologic Soil Group

Hydrologic Soil Group— Summary by Map Unit — Orange County and Part of Riverside County, California

Map unit symbol Map unit name Rating Acres in AOI Percent of AOI

134 CALLEGUAS CLAY LOAM, 50 TO75 PERCENT SLOPES,ERODED

D 21.8 21.6%

162 MARINA LOAMY SAND, 2 TO 9PERCENT SLOPES

B 11.0 10.9%

173 MYFORD SANDY LOAM, 2 TO 9PERCENT SLOPES

D 39.7 39.5%

177 MYFORD SANDY LOAM, 9 TO 30PERCENT SLOPES, ERODED

D 28.1 27.9%

Totals for Area of Interest 100.6 100.0%

Description

Hydrologic soil groups are based on estimates of runoff potential. Soils areassigned to one of four groups according to the rate of water infiltration when thesoils are not protected by vegetation, are thoroughly wet, and receive precipitationfrom long-duration storms.

The soils in the United States are assigned to four groups (A, B, C, and D) andthree dual classes (A/D, B/D, and C/D). The groups are defined as follows:

Group A. Soils having a high infiltration rate (low runoff potential) when thoroughlywet. These consist mainly of deep, well drained to excessively drained sands orgravelly sands. These soils have a high rate of water transmission.

Group B. Soils having a moderate infiltration rate when thoroughly wet. Theseconsist chiefly of moderately deep or deep, moderately well drained or well drainedsoils that have moderately fine texture to moderately coarse texture. These soilshave a moderate rate of water transmission.

Group C. Soils having a slow infiltration rate when thoroughly wet. These consistchiefly of soils having a layer that impedes the downward movement of water orsoils of moderately fine texture or fine texture. These soils have a slow rate of watertransmission.

Group D. Soils having a very slow infiltration rate (high runoff potential) whenthoroughly wet. These consist chiefly of clays that have a high shrink-swellpotential, soils that have a high water table, soils that have a claypan or clay layerat or near the surface, and soils that are shallow over nearly impervious material.These soils have a very slow rate of water transmission.

If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter isfor drained areas and the second is for undrained areas. Only the soils that in theirnatural condition are in group D are assigned to dual classes.

Hydrologic Soil Group–Orange County and Part of Riverside County, California Newport Beach City Hall Existing

Natural ResourcesConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 3 of 4

Rating Options

Aggregation Method: Dominant Condition

Component Percent Cutoff: None Specified

Tie-break Rule: Lower

Hydrologic Soil Group–Orange County and Part of Riverside County, California Newport Beach City Hall Existing

Natural ResourcesConservation Service

Web Soil Survey 2.2National Cooperative Soil Survey

4/29/2009Page 4 of 4

2-YR Rainfall Data

0.00

0.50

1.00

1.50

2.00

2.50

0 200 400 600 800 1000 1200 1400 1600

Time (min)

Depth (in)

2-YR Rainfall Data

5-YR Rainfall Data

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

0 200 400 600 800 1000 1200 1400 1600

Time (min)

Depth (in)

5-YR Rainfall Data

10-YR Rainfall Data

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

0 200 400 600 800 1000 1200 1400 1600

Time (min)

Depth (in)

10-YR Rainfall Data

25-YR Rainfall Data

0.00

1.00

2.00

3.00

4.00

5.00

6.00

0 200 400 600 800 1000 1200 1400 1600

Time (min)

Depth (in)

25-YR Rainfall Data

50-YR Rainfall Data

0.00

1.00

2.00

3.00

4.00

5.00

6.00

0 200 400 600 800 1000 1200 1400 1600

Time (min)

Depth (in)

50-YR Rainfall Data

100-YR Rainfall Data

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

0 200 400 600 800 1000 1200 1400 1600

Time (min)

Depth (in)

100-YR Rainfall Data