14

14

14

1414

1414

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$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

T.12N

T.13NR.05E

T.11N

T.12N

T.11N

R.05E

R.05E

T.10N

T.14N

T.13N

R.06ER.05E

R.07E

R.06E

R.06E

R.07ER.06E

R.08ER.07E

T.10N

T.11N

R.08ER.07E

T.11N

T.12N

R.09ER.08E

T.14N

T.15N

R.09ER.08E

T.12N

T.13N

R.09E R.10E

R.10ER.09E

T.16N

T.15N

R.11ER.10E

T.17N

T.16N

R.11ER.10E

R.12ER.11E

R.12ER.11E

T.12N

T.13N

R.12E R.13E

R.13ER.12E

T.13N

T.12N

R.14ER.13E

R.14ER.13E

T.13N

T.14N

R.14E R.15ER.16ER.15E

R.15E R.15ER.14E R.16ER.16E

R.16E

T.14N

T.15N

R.17E

R.17E

T.15N

T.16N

R.18ER.17E

T.17N

T.16N

R.18ER.17E

38° 52' 30"

39° 00' 00"

38° 45' 00"

38° 41' 15"121° 30' 04"

121° 30' 04" 121° 22' 34"

39° 07' 30"

121° 15' 04"121° 22' 34"

121° 07' 34"121° 15' 04"

121° 07' 34" 121° 00' 04"

121° 00' 04"39° 15' 00"

39° 22' 30"120° 52' 34"

38° 45' 00"

120° 52' 34"

38° 41' 15"

120° 30' 04"120° 45' 04" 120° 37' 34"

120° 45' 04" 120° 37' 34"120° 30' 04"

120° 22' 34"38° 52' 30"

120° 15' 04"

120° 22' 34"120° 15' 04"

39° 00' 00"

39° 07' 30"

120° 00' 04"120° 07' 34"

39° 15' 00"

39° 22' 30"120° 00' 04"

120° 07' 34"

F E A T H E R

F E A T H E R

F E A T H E R

F E A T H E R

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F E A T H E R

F E A T H E R

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R I V E R

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U L T R A M A F I C

U L T R A M A F I C

U L T R A M A F I C

U L T R A M A F I C

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G I L L I S H

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G I L L I S H

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G I L L I S H

I L L

G I L L I S H

I L L F A U

L T F A U

L T F A U

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L T F A U

L T F A U

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S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

S P E N C E V I L L E - D E A D M A N F A U L T Z O N E

W O

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LincolnLincolnLincolnLincolnLincolnLincolnLincolnLincolnLincoln

AuburnAuburnAuburnAuburnAuburnAuburnAuburnAuburnAuburn

RosevilleRosevilleRosevilleRosevilleRosevilleRosevilleRosevilleRosevilleRoseville

RocklinRocklinRocklinRocklinRocklinRocklinRocklinRocklinRocklinLoomisLoomisLoomisLoomisLoomisLoomisLoomisLoomisLoomis

ForesthillForesthillForesthillForesthillForesthillForesthillForesthillForesthillForesthill

MichiganMichiganMichiganMichiganMichiganMichiganMichiganMichiganMichiganBluffBluffBluffBluffBluffBluffBluffBluffBluff

DutchDutchDutchDutchDutchDutchDutchDutchDutchFlatFlatFlatFlatFlatFlatFlatFlatFlat

ColfaxColfaxColfaxColfaxColfaxColfaxColfaxColfaxColfax

80

65

193

65

49

174

49

80

80

89

89

89

28

267

80

Bear River

Bear River

Bear River

Bear River

Bear River

Bear River

Bear River

Bear River

Bear River

Camp Far WestCamp Far WestCamp Far WestCamp Far WestCamp Far WestCamp Far WestCamp Far WestCamp Far WestCamp Far WestReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoir

Folsom LakeFolsom LakeFolsom LakeFolsom LakeFolsom LakeFolsom LakeFolsom LakeFolsom LakeFolsom Lake

Bear RiverBear RiverBear RiverBear RiverBear RiverBear RiverBear RiverBear RiverBear River

North Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American River

North Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American River

Lake ClementineLake ClementineLake ClementineLake ClementineLake ClementineLake ClementineLake ClementineLake ClementineLake Clementine

Lake CombieLake CombieLake CombieLake CombieLake CombieLake CombieLake CombieLake CombieLake Combie

Rock Creek LakeRock Creek LakeRock Creek LakeRock Creek LakeRock Creek LakeRock Creek LakeRock Creek LakeRock Creek LakeRock Creek Lake

Bear RiverBear RiverBear RiverBear RiverBear RiverBear RiverBear RiverBear RiverBear River

Middle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American River

Sugar Pine ReservoirSugar Pine ReservoirSugar Pine ReservoirSugar Pine ReservoirSugar Pine ReservoirSugar Pine ReservoirSugar Pine ReservoirSugar Pine ReservoirSugar Pine Reservoir Big ReservoirBig ReservoirBig ReservoirBig ReservoirBig ReservoirBig ReservoirBig ReservoirBig ReservoirBig Reservoir

RollinsRollinsRollinsRollinsRollinsRollinsRollinsRollinsRollinsReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoir

Middle Fork American River

Middle Fork American River

Middle Fork American River

Middle Fork American River

Middle Fork American River

Middle Fork American River

Middle Fork American River

Middle Fork American River

Middle Fork American River

Midd

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North Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American RiverNorth Fork American River

Lake Valley ReservoirLake Valley ReservoirLake Valley ReservoirLake Valley ReservoirLake Valley ReservoirLake Valley ReservoirLake Valley ReservoirLake Valley ReservoirLake Valley Reservoir

Rubicon RiverRubicon RiverRubicon RiverRubicon RiverRubicon RiverRubicon RiverRubicon RiverRubicon RiverRubicon River

Kidd LakeKidd LakeKidd LakeKidd LakeKidd LakeKidd LakeKidd LakeKidd LakeKidd Lake

PalisadePalisadePalisadePalisadePalisadePalisadePalisadePalisadePalisadeLakeLakeLakeLakeLakeLakeLakeLakeLake

North Fork American River

North Fork American River

North Fork American River

North Fork American River

North Fork American River

North Fork American River

North Fork American River

North Fork American River

North Fork American River

Ice LakesIce LakesIce LakesIce LakesIce LakesIce LakesIce LakesIce LakesIce LakesCascade LakesCascade LakesCascade LakesCascade LakesCascade LakesCascade LakesCascade LakesCascade LakesCascade Lakes

Middle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American RiverMiddle Fork American River

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Rubicon River

Rubicon River

Rubicon River

Rubicon River

Rubicon River

Rubicon River

Rubicon River

Rubicon River

Rubicon River

French MeadowsFrench MeadowsFrench MeadowsFrench MeadowsFrench MeadowsFrench MeadowsFrench MeadowsFrench MeadowsFrench MeadowsReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoir

Hell HoleHell HoleHell HoleHell HoleHell HoleHell HoleHell HoleHell HoleHell HoleReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoirReservoir

Lake TahoeLake TahoeLake TahoeLake TahoeLake TahoeLake TahoeLake TahoeLake TahoeLake Tahoe

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Chris T. Higgins and John P. Clinkenbeard

By

SPECIAL REPORT 190RELATIVE LIKELIHOOD FOR THE PRESENCE OF NATURALLY OCCURRING ASBESTOS

IN PLACER COUNTY, CALIFORNIA - PLATE 1 OF 1

STATE OF CALIFORNIA - ARNOLD SCHWARZENEGGER, GOVERNORTHE RESOURCES AGENCY - MICHAEL CHRISMAN, SECRETARY FOR RESOURCES

DEPARTMENT OF CONSERVATION - BRIDGETT LUTHER, DIRECTOR

2006

CALIFORNIA GEOLOGICAL SURVEYJOHN G. PARRISH, PH.D., STATE GEOLOGIST

The California Department of Conservation makes no warranties as to the suitability of this product for any particular purpose.

Copyright © 2006 by the California Department of Conservation,California Geological Survey. All rights reserved. No part of thispublication may be reproduced without written consent of theCalifornia Geological Survey.

EXPLANATION OF THE AREAS OF RELATIVE LIKELIHOOD FOR THE PRESENCE OF NOA

These areas contain one or more of the following rock types: metamorphosed mafic volcanicrocks, metamorphosed mafic intrusive rocks, non-metamorphosed mafic intrusive rocks, andseveral structurally complex assemblages in which metamorphic rocks of different origins aremixed together. Geologic units in Placer County comprised partly or entirely of one or more ofthese rock types include the Smartville Complex, Lake Combie Complex, Logtown Ridge Formation, Calaveras Complex, Emigrant Gap Complex, Tuttle Lake Formation, ReeveFormation, and Taylor Formation. The structurally complex assemblages are broadly referredto as "structurally mixed or disrupted rocks."

The rocks in these areas generally have a lower relative likelihood for the presence of NOAthan those in the areas described as most likely to contain NOA. Nonetheless, NOA is knownto be present in these rock types either in Placer County or in similar rocks in nearby counties.The most likely settings for NOA in these rocks are in fault zones and shear zones that containslivers of serpentinite and/or high concentrations of the minerals talc and chlorite. Both chrysotileasbestos and amphibole asbestos are known to occur in such environments.

Scale: 1:100,000

2 0 2 4

Kilometers

0 1 2 3 4

Miles

Projection: California State Plane, Zone 2Datum: NAD83

Units: feet

1

Natural occurrences of chrysotile asbestos and amphibole asbestos are known to be presentin some parts of Placer County. On this map, the County is divided into areas according to therelative likelihood for the presence of naturally occurring asbestos (NOA) in different geologicunits. The presence of faulting or shearing may locally increase the likelihood for the presenceof NOA in some geologic units. The presence of NOA is possible within all of these areas, butit is more likely to be present in some areas than others.

This map is based on compilation and interpretation of geologic and soil data from variouspublished and unpublished sources available at the time of the study. Users are encouraged toread the accompanying report for further details about this map.

Based on existing information, determination of the presence or absence of NOA at specificsites on this map is not possible. Determination of whether NOA is present or absent at aspecific site will require a detailed geologic investigation of that site.

RELATIVE LIKELIHOOD FOR THE PRESENCE OF NATURALLY OCCURRING ASBESTOSIN PLACER COUNTY

These areas include ultramafic rock and serpentinite (serpentine rock), and associated soils, which are most likely to contain NOA.

DISCLAIMER

The State of California and the California Department of Conservation, CaliforniaGeological Survey make no representations or warranties as to the actual presenceor absence of natural asbestos at specific sites. Further, the State and theDepartment make no representations or warranties regarding the accuracy of thedata from which these maps were derived. Neither the State nor the Departmentshall be liable under any circumstances for any direct, indirect, special, incidentalor consequential damages with respect to any claim by any user or any third partyon account of or arising from the use of this map.

Cartographic design and GIS development by Milton Fonseca

USE AND LIMITATIONS OF MAP

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161616161616161616 6, 166, 166, 166, 166, 166, 166, 166, 166, 164a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 284a, 4b, 10, 24, 26, 28 1, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 271, 4b, 11, 13, 27

3, 5, 293, 5, 293, 5, 293, 5, 293, 5, 293, 5, 293, 5, 293, 5, 293, 5, 29

3, 293, 293, 293, 293, 293, 293, 293, 293, 29

3, 253, 253, 253, 253, 253, 253, 253, 253, 25

2, 252, 252, 252, 252, 252, 252, 252, 252, 2523, 2523, 2523, 2523, 2523, 2523, 2523, 2523, 2523, 25

10,17, 26, 2810,17, 26, 2810,17, 26, 2810,17, 26, 2810,17, 26, 2810,17, 26, 2810,17, 26, 2810,17, 26, 2810,17, 26, 2810, 1710, 1710, 1710, 1710, 1710, 1710, 1710, 1710, 17

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10, 24, 26, 2810, 24, 26, 2810, 24, 26, 2810, 24, 26, 2810, 24, 26, 2810, 24, 26, 2810, 24, 26, 2810, 24, 26, 2810, 24, 26, 28

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PleasantPleasantPleasantPleasantPleasantPleasantPleasantPleasantPleasantGroveGroveGroveGroveGroveGroveGroveGroveGrove

RosevilleRosevilleRosevilleRosevilleRosevilleRosevilleRosevilleRosevilleRoseville RocklinRocklinRocklinRocklinRocklinRocklinRocklinRocklinRocklin Pilot HillPilot HillPilot HillPilot HillPilot HillPilot HillPilot HillPilot HillPilot Hill

SheridanSheridanSheridanSheridanSheridanSheridanSheridanSheridanSheridanTunnelTunnelTunnelTunnelTunnelTunnelTunnelTunnelTunnel

HillHillHillHillHillHillHillHillHill

CampCampCampCampCampCampCampCampCampFar WestFar WestFar WestFar WestFar WestFar WestFar WestFar WestFar West

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MichiganMichiganMichiganMichiganMichiganMichiganMichiganMichiganMichiganBluffBluffBluffBluffBluffBluffBluffBluffBluff

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WheatlandWheatlandWheatlandWheatlandWheatlandWheatlandWheatlandWheatlandWheatland

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Bunker HillBunker HillBunker HillBunker HillBunker HillBunker HillBunker HillBunker HillBunker HillWentworthWentworthWentworthWentworthWentworthWentworthWentworthWentworthWentworth

SpringsSpringsSpringsSpringsSpringsSpringsSpringsSpringsSprings

FolsomFolsomFolsomFolsomFolsomFolsomFolsomFolsomFolsomCitrusCitrusCitrusCitrusCitrusCitrusCitrusCitrusCitrus

HeightsHeightsHeightsHeightsHeightsHeightsHeightsHeightsHeightsRio LindaRio LindaRio LindaRio LindaRio LindaRio LindaRio LindaRio LindaRio Linda

HomewoodHomewoodHomewoodHomewoodHomewoodHomewoodHomewoodHomewoodHomewood

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DuncanDuncanDuncanDuncanDuncanDuncanDuncanDuncanDuncanPeakPeakPeakPeakPeakPeakPeakPeakPeakWestvilleWestvilleWestvilleWestvilleWestvilleWestvilleWestvilleWestvilleWestvilleDutch FlatDutch FlatDutch FlatDutch FlatDutch FlatDutch FlatDutch FlatDutch FlatDutch Flat

ChicagoChicagoChicagoChicagoChicagoChicagoChicagoChicagoChicagoParkParkParkParkParkParkParkParkPark

KingsKingsKingsKingsKingsKingsKingsKingsKingsBeachBeachBeachBeachBeachBeachBeachBeachBeach

Tahoe CityTahoe CityTahoe CityTahoe CityTahoe CityTahoe CityTahoe CityTahoe CityTahoe CityGraniteGraniteGraniteGraniteGraniteGraniteGraniteGraniteGraniteChiefChiefChiefChiefChiefChiefChiefChiefChief

MeeksMeeksMeeksMeeksMeeksMeeksMeeksMeeksMeeksBayBayBayBayBayBayBayBayBay

MartisMartisMartisMartisMartisMartisMartisMartisMartisPeakPeakPeakPeakPeakPeakPeakPeakPeak

TruckeeTruckeeTruckeeTruckeeTruckeeTruckeeTruckeeTruckeeTruckeeNordenNordenNordenNordenNordenNordenNordenNordenNordenSodaSodaSodaSodaSodaSodaSodaSodaSoda

SpringsSpringsSpringsSpringsSpringsSpringsSpringsSpringsSpringsCiscoCiscoCiscoCiscoCiscoCiscoCiscoCiscoCiscoGroveGroveGroveGroveGroveGroveGroveGroveGrove

BlueBlueBlueBlueBlueBlueBlueBlueBlueCanyonCanyonCanyonCanyonCanyonCanyonCanyonCanyonCanyonWashingtonWashingtonWashingtonWashingtonWashingtonWashingtonWashingtonWashingtonWashington

1. Aune, Q.A., 1965, Geologic reconnaissance of the Greenwood 15-minutequadrangle: California Department of Conservation, Division of Mines andGeology, unpublished field study for State Map Project, scale 1:24,000.

2. Chandra, D.K., 1961, Geology and mineral deposits of the Colfax andForesthill quadrangles, California: California Division of Mines SpecialReport 67, 50 p.

3. Clark, L.D. and Huber, N.K., 1975, Geologic observations and sections alongselected stream traverses, northern Sierra Nevada metamorphic belt, California:U.S. Geological Survey Miscellaneous Field Studies Map MF-690, scale 1:62,500.

4a. Edwards, J.M., 1978, Tectonic evolution of the western Sierra NevadaMountains Foothills belt: A case for continental accretion: Ph.D. dissertation,Rice University, 125 p.

4b. Graymer, R.W., 1992, Structural evolution of the central part of the Foothillsterrane, Sierra Nevada, California: Ph.D. dissertation, University of California,Berkeley, 173 p.

5. Harwood, D.S., 1980, Geologic map of the North Fork of the American RiverWilderness Study Area and adjacent parts of the Sierra Nevada, California: U.S.Geological Survey Map MF-1177-A, scale 1:62,500.

6. Harwood, D.S., 1983, Geologic and geochemical maps of the RubiconRoadless Area, Placer and El Dorado Counties, California: U.S. GeologicalSurvey Map MF-1501-A, scale 1:24,000.

7. Harwood, D.S. and Fisher, G.R. Jr., 2002, Geologic map of part of easternPlacer County, California: U.S. Geological Survey (in preparation), scale 1:48,000.

8. Helley, E.J. and Harwood, D.S., 1985, Geologic map of the Late Cenozoicdeposits of the Sacramento Valley and northern Sierran foothills, California: U.S.Geological Survey Miscellaneous Field Studies Map MF-1790, scale 1:62,500.

9. James, O.B., 1971, Origin and emplacement of the ultramafic rocks of theEmigrant Gap area, California: Journal of Petrology, v. 12, no. 3, p. 523-560.

16. McJunkin, R.D. and Taylor, G.C., 1979b, Geologic reconnaissance of theSaddle Mountain 15-minute quadrangle: California Division of Mines andGeology, unpublished field study for State Map Project, scale 1:62,500.

17. Olmsted, F.H., 1971, Pre-Cenozoic geology of the south half of theAuburn 15-minute Quadrangle, California: U.S. Geological Survey Bulletin1341, 30 p.

18. Redmond, J.L., 1966, Structural analysis of the Blue Canyon Formationin the Sierra Nevada, Placer County, California: Ph.D. dissertation, Universityof Oregon, 197 p.

19. Saucedo, G.J., 2005, Geologic map of the Lake Tahoe Basin, California andNevada: California Geological Survey Regional Geologic Map Series Map No. 4,scale 1:100,000.

20. Saucedo, G.J. and Wagner, D.L., 1985, Reconnaissance geologic map ofportions of the Wheatland 15-minute quadrangle: California Division of Minesand Geology, unpublished field study for State Map Project, scale 1:62,500.

21. Schweickert, R.A., Harwood, D.S., Girty, G.H., and Hanson, R.E., 1984,Geologic map of the Emigrant Gap 15-minute quadrangle: Unpublished,scale 1:62,500.

22. Southern Pacific Company, 1959, Regional geologic mapping program:Unpublished maps of T14N, R14-16E, MDB&M, scale 1:24,000.

23. Springer, R.K., 1981, A geologic report on the Bear River area, northeastof Auburn, California: California Division of Mines and Geology, unpublishedfield study for State Map Project, scale 1:24,000.

24. Taylor, G.C., 1979, Geologic reconnaissance of the north half of theAuburn 15-minute quadrangle: California Division of Mines and Geology,unpublished report and map for State Map Project, scale 1:24,000.

25. Tuminas, A., 1983, Structural and stratigraphic relations in the GrassValley-Colfax area of the northern Sierra Nevada, California: Ph.D.dissertation, University of California, Davis, 415 p.

26. U.S. Bureau of Reclamation, 1977, Project geology report, AuburnDam, Seismic evaluation of Auburn damsite: Volume 1, 44 p.

27. Wagner, D.L., 1979, Geologic reconnaissance of the Georgetown7-1/2-minute quadrangle: California Division of Mines and Geology,unpublished field study for State Map Project, scale 1:62,500.

28. Woodward-Clyde Consultants, 1977, Earthquake evaluationstudies of the Auburn Dam area: Surface faulting potential: Preparedunder Contract No. 6/07/DS/72090 for the U.S. Bureau of Reclamation,Vol. 2, Appendixes A and B.

29. Yeend, W.E., 1974, Gold bearing gravel of the ancestral YubaRiver, Sierra Nevada, California: U.S. Geological Survey ProfessionalPaper 772, 44 p.

REGIONAL GEOLOGIC AND SOILS MAPS USED(These cover all or large parts of Placer County)

Clark, L.D., 1976, Stratigraphy of the north half of the western Sierra Nevadametamorphic belt, California: U.S. Geological Survey Professional Paper 923, 26 p.

Day, H.W. and Bickford, M.E., 2004, Tectonic setting of the Jurassic Smartvilleand Slate Creek complexes, northern Sierra Nevada, California: GeologicalSociety of America Bulletin, v. 116, no. 11-12, p. 1515-1528.

Graymer, R.W. and Jones, D.L., 1994, Tectonic implications of radiolarian chertsfrom the Placerville Belt, Sierra Nevada Foothills, California: Nevadan-agecontinental growth by accretion of multiple terranes: Geological Society ofAmerica Bulletin, v. 106, p. 531-540.

Hanes, R.O. and others, 1982, Soil survey of Tahoe National Forest area,California: U.S. Department of Agriculture, Forest Service, 377 p.

Livingston, J.G., 1976, Handbook of environmental geology: Placer County,California: Unpublished report prepared for Placer County Planning Department(includes 21 1:24,000-scale geologic maps).

Loyd, R.C., 1995, Mineral Land Classification of Placer County, California:California Department of Conservation, Division of Mines and GeologyOpen-File Report 95-10, 65 p.

Rogers, J.H., 1980, Soil survey of Placer County, California: Western Part:U.S. Department of Agriculture, Soil Conservation Service, 204 p.

Saucedo, G.J. and Wagner, D.L., 1992, Geologic map of the ChicoQuadrangle, California: California Department of Conservation, Divisionof Mines and Geology Regional Geologic Map Series, Map No. 7A,scale 1:250,000.

U.S. Forest Service, 2005, Digital geologic map of the Tahoe National Forest.

Wagner, D.L., Jennings, C.W., Bedrossian, T.L., and Bortugno, E.J.,1981, Geologic map of the Sacramento Quadrangle, California:California Department of Conservation, Division of Mines and GeologyRegional Geologic Map Series, Map No. 1A, scale 1:250,000.

INDEX TO U.S. GEOLOGICAL SURVEY 7.5-MINUTE QUADRANGLES AND TO GEOLOGIC AND SOILS MAPPING USED FOR COMPILATION OF THIS MAP

10. Kohler, S.L., 1983, Mineral Land Classification of the Auburn 15-minuteQuadrangle, El Dorado and Placer Counties, California: California Departmentof Conservation, Division of Mines and Geology Open-File Report 83-37, 48 p.

11. Kohler, S.L., 1984, Mineral Land Classification of the Georgetown 15-minuteQuadrangle, El Dorado and Placer Counties, California: California Department ofConservation, Division of Mines and Geology Open-File Report 83-35, 78 p.

12. Lindgren, W., 1900, Colfax Folio, California: U.S. Geological Survey GeologicAtlas of the United States, Folio 66, scale 1:125,000.

13. Lindgren, W. and Turner, H.W., 1894, Placerville Folio, California: U.S.Geological Survey Geologic Atlas of the United States, Folio 3, scale 1:125,000.

14. Loyd, R.C., 1984, Mineral Land Classification of the Folsom 15-minuteQuadrangle, Sacramento, El Dorado, Placer and Amador Counties, California:California Department of Conservation, Division of Mines and Geology Open-FileReport 84-50, 44 p.

15. McJunkin, R.D. and Taylor, G.C., 1979a, Geologic reconnaissance of theRobbs Peak 15-minute quadrangle: California Division of Mines and Geology,unpublished field study for State Map Project, scale 1:62,500.

This section provides more information on the characteristics of each of the NOA areas shownon the map of Placer County. Additional details are presented in the report that accompaniesthis map.

These areas contain ultramafic rock and serpentinite, and their associated soils. Serpentiniteand partially serpentinized ultramafic rock commonly contain chrysotile asbestos. These rocksmay also host amphibole asbestos, typically the following varieties: tremolite, actinolite, oranthophyllite. Soils derived from ultramafic rock and serpentinite may contain NOA. Thesesoils are commonly designated as "ultramafic soils" or "serpentine soils" on soil maps. Soilmaps of Placer County by the U.S. Department of Agriculture's Natural Resources Conservation Service and the U.S. Forest Service include the following ultramafic- andserpentinite-related soils series: Dubakella, Henneke, and Forbes.

The California Geological Survey did not evaluate deposits of unconsolidated sediment alongrivers and creeks below areas of ultramafic rock and serpentinite for their likelihood to containNOA. Such deposits may contain NOA, but no studies of NOA in such sediment in PlacerCounty were identified during research for this mapping project. Many of these deposits aretoo small to depict on this map.

Areas Most Likely to Contain NOA:

Areas Moderately Likely to Contain NOA:

Areas Least Likely to Contain NOA: These areas contain one or more of the following rock types: metamorphosed sedimentary rocks,metamorphosed non-mafic volcanic rocks, granitic rocks, volcanic rocks, alluvium, and glacialdeposits. Geologic units in Placer County comprised partly or entirely of one or more of themetamorphic rock types include the Colfax sequence (Fiddle Creek Complex), CalaverasComplex, Shoo Fly Complex, Sailor Canyon Formation, Sierra Buttes Formation, Peale Formation,and Lake Tahoe sequence. The granitic rocks include the Rocklin and Penryn plutons.

The technical documents reviewed during compilation of this map did not indicate the presenceof NOA in any of these rock types within Placer County. The mineral actinolite has been reportedat a few localities in the metamorphosed sedimentary rocks, but whether or not it is asbestoswas not reported; in general, non-asbestiform actinolite is much more common than actinolite-asbestos in the Sierra Nevada. Based on the available information, the relative likelihood for thepresence of NOA in these areas is lower than that in areas identified as most likely or moderatelylikely to contain NOA. Small bodies of rock or soil with moderate or higher likelihood for thepresence of NOA may occur within some of these areas, but they remain undiscovered or aretoo small to depict on this map.

Areas of Faulting or Shearing:

The western half of Placer County contains many mapped fault and shear zones, some of whichcontain NOA, or are potentially favorable environments for its presence. These are linear beltsof highly fractured and deformed rocks, highlighted by stippling on the map where they overlapareas most likely or moderately likely to contain NOA. These areas may have an increasedlikelihood for the presence of NOA beyond that of the underlying area.

The stippling on the map is intended to draw attention to these areas as localities with increasedlikelihood for the presence of NOA above that of unfaulted or unsheared areas. For example, anarea of faulting or shearing shown within an area mapped as moderately likely to contain NOAwould be expected to have a higher relative likelihood for the presence of NOA than that of themoderately-likely area by itself. The widths of the stippled areas shown on the map are not intended to precisely depict the actual width of a fault or shear zone at any particular location.Fault zones in the Sierra Nevada Foothills are seldom less than two hundred feet wide and maybe several thousand feet wide or more. The width of a fault zone commonly varies along itslength. Detailed information on the width of fault zones is largely unavailable for westernPlacer County.

These areas include those metamorphic and igneous rocks that are moderately likely to contain NOA.

These areas include those metamorphic, igneous, and sedimentary rocks that are least likely to contain NOA.

These areas are zones of faulted or shearedrock that may locally increase the relative likelihood for the presence of NOAwithin or adjacent to areas moderately or most likely to contain NOA. The solidlines represent mapped traces of fault and shear zones; question marksindicate uncertainty regarding the continued extent of the traces.

Mapped trace of fault or shear zone. These features may locally increase thelikelihood for the presence of NOA within areas least likely to contain NOA. Thepresence of NOA along these features is more likely within areas mapped asmost likely or moderately likely to contain NOA as described above.

Areas Most Likely to Contain NOA:

Areas Moderately Likely to Contain NOA:

Areas Least Likely to Contain NOA:

Areas of Faulting or Shearing:

FRAMEWORK DATA

Base map data for hydrography and roads were provided by Placer County Planning Department; Public Land Survey (PLSS) by California Department of Conservation,Division of Oil, Gas, and Geothermal Resources; and political boundaries by CaliforniaDepartment of Forestry and Fire Protection.

RELATIVE LIKELIHOOD FOR THE PRESENCE OFRELATIVE LIKELIHOOD FOR THE PRESENCE OFNATURALLY OCCURRING ASBESTOS IN PLACER COUNTY,NATURALLY OCCURRING ASBESTOS IN PLACER COUNTY,

CALIFORNIACALIFORNIA

California Geological Survey Web Site: http://www.consrv.ca.gov/cgs/

Areas of Relative Likelihood for the Presence of NOA

NOA in Other Geologic Environments

NOA can be associated with many different rock types in a variety of geologic environments.The geologic environments for NOA discussed on this map are those known or stronglysuspected to contain NOA in Placer County. The research for this mapping project did notreveal occurrences of NOA in other geologic settings in the county. However, thepossibility that additional occurrences will be discovered in the future cannot be ruled out.These less-common possibilities for the presence of NOA are discussed in the accompanying report.

Chrysotile and tremolite/actinolite asbestos are known to occur in Placer County. Other varieties of NOA may also be present within the county.

The purpose of this map is to provide information to local, state and federal agencies, and the public as to areas where naturally occurring asbestos is most likely to be found in Placer County. This information includes locations of major mapped faults and fault zones, as well as certain rock and soil types with potential for containing naturally occurring asbestos.

This map is based on a compilation of geologic data and soil data from various published and unpublished sources available at the time of the study. These sources are identified on the map and in the accompanying report. This map is also based on limited geologic fieldwork by staff of the California Department of Conservation, California Geological Survey.

The scale of this map is 1:100,000 (one inch = 1.6 miles). This map is intended for use in conjunction with the companion report. The report provides detailedinformation on the underlying geologic assumptions for the map, map compilationprocedures, map accuracy, and guidance on map usage and limitations.

This map should not be used to determine whether bedrock or soil on a particular parcel of land contains naturally occurring asbestos. A detailed site-specific investigation is required to make such a determination.

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C G SC G S

Areas moderately likely to contain NOA