Download Structural Analysis Laborde Canyon

Lineament Study
Lockheed Martin Corporation, Beaumont Site 2
Beaumont, California
Prepared for:
301 E. Vanderbilt Way, Suite 450
San Bernardino, California 92408-3559
TC# 23522-0502 / November 2009
TJV-23522-2109
17 November 2009
Denise Kato
Lockheed Martin Corporation
Environmental Remediation Analyst Senior Staff
1111 Lockheed Way, Building 157
Sunnyvale, CA 94089
Subject: Provision of corrected Lineament Study, Lockheed Martin Corporation, Beaumont Site 2,
Beaumont California
Dear Ms. Kato:
Please find enclosed 1 electronic copy of the text of the corrected Lineament Study, Lockheed Martin
Corporation, Beaumont Site 2, Beaumont California for your review and comment. The November 13
deliverable mistakenly made use of a replaced version of the text.
If you have any questions, please don’t hesitate to call me at (909) 381-1674.
Sincerely,
Thomas J. Villeneuve
Program Manager
Enclosures:
cc:
Corrected Lineament Study, Lockheed Martin Corporation, Beaumont Site 2, Beaumont
California
John Eisenbeis, CDM (1 electronic copy)
Mike Smith, CDM (1 electronic copy)
Thomas J. Villeneuve, Tetra Tech, Inc. (1 hard copy)
Tetra Tech, Inc.
301 E. Vanderbilt Way, Suite 450, San Bernardino, CA 92408-3559
Tel 909.381.1674 Fax 909.889.1391 www.tetratech.com
TETRA TECH, INC.
NOVEMBER 2009
TABLE OF CONTENTS
1.0
INTRODUCTION ........................................................................................................................... 1
2.0
METHODOLOGY .......................................................................................................................... 2
2.1
TASK 1 - LITERATURE AND REVIEW ......................................................................... 2
2.2
TASK 2 - LINEAMENT STUDY ...................................................................................... 2
2.3
TASK 3 - GEOLOGIC FIELD INVESTIGATIONS AND MAPPING ............................ 3
3.0
REGIONAL SETTING ................................................................................................................... 4
3.1
GENERAL REGIONAL GEOLOGY ................................................................................ 4
3.2
GENERAL SITE GEOLOGY ............................................................................................ 5
3.3
STRUCTURAL GEOLOGY .............................................................................................. 6
4.0
LINEAMENTS ................................................................................................................................ 7
4.1
FAULTS IDENTIFIED BASED ON THE LINEAMENT STUDY .................................. 7
4.2
SHATTERED RIDGES...................................................................................................... 8
5.0
GROUNDWATER FLOW.............................................................................................................. 9
5.1
GENERAL OBSERVATIONS REGARDING GROUNDWATER FLOW ..................... 9
5.2
GENERAL OBSERVATIONS REGARDING POROSITY AND
PERMEABILITY OF SEDIMENTARY ROCKS ............................................................. 9
5.3
SURFACE WATER IN LOWER LABORDE CANYON ................................................. 9
6.0
REFERENCES .............................................................................................................................. 11
7.0
ACRONYMS................................................................................................................................. 13
LIST OF FIGURES
Figure 1 Regional Fault Map, Lockheed Beaumont Sites 1 and 2.............................................................F-1
Figure 2 Geologic Map, Lockheed Beaumont Site 2.................................................................................F-2
Figure 3 Photo Location Map ....................................................................................................................F-3
PHOTOGRAPHS
Photographs Contained in Final Section at Back of Report
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INTRODUCTION
This report presents the results of a geologic investigation of the former Lockheed Martin Corporation
(LMC) Beaumont Site 2 area (Site 2) and the lower Laborde Canyon area downstream of Site 2, located
near Beaumont, California (Figure 1). The objective of the investigation was to detect lineaments and
faults within Site 2 and the lower Laborde Canyon area, and to determine the relationship, if any, between
faulting and groundwater flow at Site 2. Douglas M. Morton, PhD, a retired geologist from the U.S.
Geological Survey and regional expert on the structural framework and geologic history of the Transverse
and Peninsular Ranges of southern California, performed this lineament study under subcontract to Tetra
Tech, Inc. The lineament study at Site 2 consisted of the following tasks:
●
●
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Task 1: an archival literature and stereographic aerial photography search, followed by analysis
of available literature;
Task 2: identification of lineaments on archival aerial photography; and
Task 3: geologic field investigation of Site 2. Task 3 included geologic field mapping and
verification of the locations of previously mapped faults in Laborde Canyon, and examination of
lineaments in the metamorphic rocks near the mouth of Laborde Canyon. Geologic mapping
included the Laborde Canyon area both within Site 2 and to the south of Site 2 to Gilman Springs
Road at the mouth of Laborde Creek. Emphasis in this task was detection of faults that could be
groundwater barriers.
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2.1
NOVEMBER 2009
METHODOLOGY
TASK 1 - LITERATURE AND REVIEW
This task included reviewing past geologic and geophysical investigations for the LMC Beaumont Site 1
(Site 1) and Site 2 areas. This included published papers, unpublished theses, and results of earlier work
conducted at Site 1 and Site 2 for LMC. A list of the material reviewed is included in the reference list at
the back of this report. Figure 1 shows the distribution of faults within the general area of Site 2 and Site
1. None of the reviewed geologic literature showed any mapped faults within the Laborde Canyon area of
Site 2. The only available 1:24,000 scale geologic map of the El Casco 7.5-minute (’) quadrangle shows
no faults in the Laborde Canyon area of Site 2 (Dibblee, 2003a). One fault is identified at the basement
rock-sedimentary rock contact located on the western side of the Mount Eden structural block, to the west
of Laborde Canyon near Gilman Springs Road. Likewise, no faults for Site 2 proper are shown on the
100,000-scale San Bernardino and Santa Ana quadrangles (Morton and Miller, 2006). The 100,000-scale
map shows a curving branching fault near the contact of the Mount Eden formation (MEF) with the San
Timoteo formation (STF), which crosses Laborde Canyon approximately 1,900 feet south of the Site 2
property boundary.
2.2
TASK 2 - LINEAMENT STUDY
This task consisted primarily of examining stereographic aerial photographs for lineaments. Most of the
aerial photographs were at a nominal scale of 1:24,000 and 1:16,000. An Abrams CB-1 Stereoscope was
used for examining the aerial photographs. Ages of aerial photographs examined are listed at the end of
the reference section. Google Earth images, both vertical and oblique, were also used as an adjunct to the
stereographic aerial photographs examination.
No well defined lineaments were found in Site 2 proper. However, four unusually linear
northwest-trending canyons were noted in Site 2. Based on their regularity in orientation, it was felt they
should be carefully examined to determine if their linear nature could be fault controlled. The northern
canyon, the first canyon on the west side of Laborde Canyon north of Building 250 (former Rocket
Assembly Building) is oriented about N42°W. The second linear canyon is informally referred to as “Test
Bay Canyon.” Test Bay Canyon is oriented about N35°W. The third canyon, oriented about N57°W,
enters Laborde Canyon approximately 2,700 feet south of Test Bay Canyon. The fourth canyon enters
Laborde Canyon about 600 feet north of the southern boundary of Site 2.
The search for lineaments south of Site 2 located five pronounced northwest-trending lineaments in
metamorphic rocks on the west side of the lower part of Laborde Canyon.
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TASK 3 - GEOLOGIC FIELD INVESTIGATIONS AND MAPPING
After reviewing relevant literature and aerial photographs, a reconnaissance geologic investigation was
performed in the general area of Site 2. This reconnaissance included the area of Laborde Canyon from
the Site 2 property boundary south to Gilman Springs Road. The principal goal of the reconnaissance
work was identification of faults in the vicinity of Site 2 and lower Laborde Canyon. Detailed
examination was also conducted in selected areas within Site 2.
The geologic map of Laborde Canyon (Figure 2) includes geologic information from the San
Bernardino-Santa Ana quadrangles geologic map (Morton and Miller, 2006) and from the geologic map
of the Lakeview 7.5’ quadrangle (Morton and Matti, 2001). This information was modified based on field
observations. A curving and branching fault shown on the San Bernardino-Santa Ana 1:100,000
quadrangle (Morton and Miller, 2006) crosses Laborde Creek about 1,900 feet south of the southern
boundary of Site 2. This branching fault is interpreted to be related to the uplift of the Mount Eden
basement block. A major northwest-striking fault that dips northeast and is related to the San Jacinto Fault
Zone projects across the mouth of Laborde Creek about 300 feet south of Gilman Springs Road.
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REGIONAL SETTING
Laborde Canyon lies within the San Timoteo Badlands of western Riverside County, near the intersection
of Interstate 10 and Highway 60. The primary bedrock formation in the area is the STF (Frick, 1921). The
STF is comprised of alternating layers of siltstone, sandstone, and conglomerate beds. The STF is
interpreted to represent alluvial fan and floodplain deposits originating from the San Bernardino
Mountains to the north.
Tectonically, the San Timoteo Badlands lies between the San Andreas Fault Zone to the north and the San
Jacinto Fault Zone to the south. Compressional tectonics related to the movement on the San Jacinto and
associated faults has uplifted the badlands and created a broad northeast-trending anticline situated near
the southwest corner of Site 2. Uplift of the weak STF has lead to high rates of erosion, oversteepening of
slopes and a complex drainage network characteristic of badlands topography.
3.1
GENERAL REGIONAL GEOLOGY
Site 2 is located in the southern part of the San Timoteo Badlands. Sedimentary rocks underlying most of
the San Timoteo Badlands are mainly the Pliocene-early Pleistocene age STF (Frick, 1921) and lesser
amounts of the Miocene age MEF (Frick, 1921). Both the MEF and the STF consist of lithified and
relatively low-permeability rocks. The MEF consists of less permeable deposits than those of the STF.
The San Timoteo Badlands results from erosion of an uplifted block of late Tertiary age non-marine
sedimentary rocks. In the area south of San Bernardino Valley, the sedimentary material is deformed and
elevated as it passes by a restraining bend in the San Jacinto Fault approximately 10 miles northwest of
Laborde Canyon. The uplift is ramp-like, with the sediments rising about 2,500 feet as the rocks pass the
restraining bend. Deformation is most intense adjacent to the San Jacinto Fault where tightly folded and
fractured rocks occur. East of the intensely deformed sediments the deformation has produced a large
asymmetric anticline with a relatively steeper southwest limb and a more gently inclined northeast limb.
Northeast of the gently sloping east flank of the anticline is the southwestward-sloping surface of the
Beaumont Plain, which is capped by Pleistocene alluvium.
The age of the elevated sedimentary units underlying the badlands progressively increase in age southeast
from the area of the restraining bend to the area of Potrero Creek. Most of the badlands are underlain by
the four informal members of the STF. In the vicinity of the restraining bend is the upper member of early
Pleistocene age. The upper member is overlain by the thicker and more widespread late Pliocene middle
member that extends southeastward through the upper part of Laborde Canyon. The middle member
consists of conglomerate beds with interbedded sandstone, reddish colored mudstone, and minor
grayish-green mudrock. The early Pliocene lower member underlies most of the Laborde Canyon area at
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Site 2. The contact between the middle and lower members is transitional over a stratigraphic thickness as
much as 150 feet. The lower member consists of mostly well indurated sandstone and sparse
conglomerate. Some intervals are cemented by carbonate and/or silica.
The late Miocene MEF underlies the STF. The MEF consists of four informal members. The upper
heterogeneous member occurs in the vicinity of the abandoned Eden Hot Springs resort. This unit consists
of greenish-gray mudstone, whitish nodular and lenticular limestone, and lesser amounts of arkosic and
conglomerate sandstone, greenish-gray mudstone, and biotitic sandstone. Beneath the heterogeneous
member is the arkosic member that consists of well consolidated, thin- to thick-bedded arkosic
coarse-grained sandstone and conglomerate. This unit comprises most the MEF in the Laborde Canyon
area. The boulder conglomerate member consists of discontinuous beds of monolithologic breccia and
conglomerate comprised of distinctive sphene-bearing biotite-hornblende tonalite clasts (the tonalite of
Lamb Canyon; Morton and Miller, 2006). The boulder conglomerate member occurs within the arkosic
member. These breccia-conglomerate intervals appear to be mostly debris flow deposits derived from
tonalite in the eastern upper reaches of Laborde Canyon and the Mount Davis area further northeast
(Figure 1). Clasts include boulders up to 21 feet in diameter. This unit occurs mostly on the lower east
side of Laborde Canyon. On the east side of the canyon near the powerline road is an exposure of tonalite
that appears to be in-situ, but is interpreted to be part of a massive landslide with most of the deposit
consisting of intact-appearing tonalite. In the lower part of Laborde Canyon the MEF fills the axial part of
a Miocene canyon cut in basement rocks that are exposed to the northwest and southeast of lower
Laborde Canyon. The sedimentary rocks that now comprise the boulder conglomerate member were
apparently debris flows and coherent landslide masses that funneled into this canyon.
3.2
GENERAL SITE GEOLOGY
The geology of the Site 2 and Laborde Canyon area can be considered to consist of two distinct parts, a
southern geologically complex lower part bounded on the south by the Claremont strand of the San
Jacinto Fault Zone (Figure 1), and a geologically simple northern part within upper Laborde Canyon. The
lower part (the eastern part of the Mount Eden block) consists of a core of metamorphic rocks and granitic
intrusives flanked by sedimentary rocks of the MEF and the STF. The metamorphic complex consists of
upper amphibolite-grade biotite schist and gneiss with lesser amounts of elongate bodies of
coarse-grained marble (Morton and Matti, 2001; Morton and Miller, 2006). Foliation in the schist and
gneiss strikes about N55°W and dips rather steeply to the northeast. Based on lithologic character these
rocks are interpreted to be of Paleozoic age (Morton and Miller, 2006). Several elongate bodies of
Cretaceous garnet– and muscovite-bearing leucogranitic rock (the Mount Eden granite of Morton and
Miller, 2006) forms sill-like intrusives in the metamorphic rocks.
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Unconformably overlying the basement rocks on the north side of the basement rock core is the arkose
member of the MEF (Morton and Miller 2006). Locally within the arkose member is a monolithologic
breccia unit. Several near vertical to north-dipping faults occur within the MEF, which cross Laborde
Canyon approximately 1,900 feet south of the former Lockheed Beaumont Site 2 boundary. These faults
have an unusual curving strike, apparently due to the complex structural history of the area combining
rounding the compressional bend of the San Jacinto fault and the regional uplift.
MEF is in fault contact with the basement rocks on the south side of the basement core. The
northwest-striking fault that bounds the basement rock dips moderately (45°-50°) to the northeast. The
sedimentary rocks between the basement and the San Jacinto Fault zone are complexly deformed. To the
west of the mouth of Laborde Canyon these deformed rocks include an elongate mass of poorly exposed
biotite-hornblende tonalite (the tonalite of Lamb’s Canyon; Morton and Miller, 2006).
3.3
STRUCTURAL GEOLOGY
Site 2 is situated between two major structural features of southern California; the San Andreas Fault to
the north, and the San Jacinto Fault to the south. Both faults are right-lateral strike slip faults that have
considerable offset. Since the Site 2-lower Laborde Canyon area is sandwiched between these two major
structural features, it is not unexpected that subsequent faulting and structural discontinuities would be
present in the area between these two major fault zones. Dominant northwest-southeast oriented faults
and shear zones are expected in a structural setting where the generally east-west oriented, right-lateral
strike-slip movement of the San Andreas Fault is present to the north and the northwest-southeast
striking, right-lateral movement of the San Jacinto Fault Zone is situated to the south. A
northwest-oriented basement rock block (the Mount Eden block) extends from the site of the abandoned
Eden Hot Springs resort southeast to the west side of lower Laborde Canyon. The compressional
deformation that is expressed as tight folds in the overlying sediments is expressed quite differently in the
steeply dipping foliation in the schist within the Mount Eden block. Displacement along foliation planes
in the schist and gneiss has produced a series of faults parallel to the foliation. Five such ‘foliation plane’
faults were mapped south of Site 2 on the west side of lower Laborde Canyon.
Known faults that cross Laborde Canyon include the curving fault that crosses Laborde Canyon south of
the LMC Site 2 boundary. Two other faults within Site 2 proper have been mapped by Morton and Miller
(2006): one located near the southeastern site boundary which strikes approximately N32ºW; and a
second set of faults near the southwest corner of the site originating near the former Eden Hot Springs
resort area, which have a strike of roughly N70ºW. Faults previously mapped along the western boundary
of Site 2 by Morton and Miller (2006) (Figure 1) do not extend through Site 2, according to published
reports.
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4.0
4.1
NOVEMBER 2009
LINEAMENTS
FAULTS IDENTIFIED BASED ON THE LINEAMENT STUDY
Geologic mapping in Site 2 resulted in locating only a single small fault. This fault is located where
Disposal Site Canyon intersects Laborde Canyon near monitoring well TT-MW2-4S. This fault, with a
thin zone of fragmented sandstone, has a strike of N65°W and dips 20°S (Photograph 1). Based on the
exposure, this fault is probably very localized with little strike length.
Terra Physics’ (2008) geophysical report on Site 2 shows two possible faults extending up Laborde
Canyon south of Test Bay Canyon. One possible fault projects along a ridge crest between Laborde
Canyon and Test Bay Canyon; the second possible fault diagonally crosses Test Bay Canyon at a very
small angle. Examination of the ridge between Laborde Canyon and Test Bay Canyon found a broad zone
of thoroughly fractured STF. There is no perceived regularity to the fractures. The fractured rock is
probably the result of fragmentation of the STF due to focused energy at the ridge top during earthquakes.
No field evidence was found for the possible fault crossing Test Bay Canyon, primarily due to poor
exposures. Similarly, no field evidence of faulting was found within Site 2 along the other linear canyons.
However, exposures in Site 2 are generally too poor to be considered diagnostic.
The orientations of the four linear canyons located along the western side of Laborde Canyon are
suggestive of being fault controlled, and were projected west to Jackrabbit Trail Road. Road cuts were
examined along the northern part of Jackrabbit Trail Road in the area where the bearing of the four linear
canyons project. A number of faults were located in road cuts along Jackrabbit Trail Road that project in a
linear fashion to the northern three linear canyons in Site 2 (Photographs 2, 3, and 4). It is assumed these
northwest-striking faults are primarily right-lateral strike-slip faults. A few subhorizontal slickensides
were found in fault gouge; the subhorizontal orientation of the slickensides supports the assumption that
the faults are primarily strike-slip faults. Based on the faults seen along Jackrabbit Trail Road and the
projection of the faults to the southeast, the four linear canyons in Site 2 are considered fault controlled.
The exact location of the faults within the canyon is not known. The possible fault identified by Terra
Physics (2008) is probably one or more of the faults observed along Jackrabbit Trail Road. No evidence
was found on Jackrabbit Trail Road for the fourth (southernmost) fault, but based on the similarity to the
other three fault-controlled canyons, the fourth canyon is interpreted as also being fault controlled.
Additional detailed geologic mapping would be required to accurately determine the location of any faults
entering Site 2 from the west. A previously mapped fault south of Site 2 may merge with the east end of
the southern of the four faults. Exploratory excavations would be required for accurate location of faults
in the alluviated parts of Laborde Canyon.
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Geologic information from the San Bernardino-Santa Ana quadrangles geologic map (Morton and Miller,
2006) and from the geologic map of the Lakeview 7.5’ quadrangle (Morton and Matti, 2001) were
modified and used. A curving and branching fault shown on the San Bernardino-Santa Ana 1:100,000
quadrangles (Morton and Miller, 2006) crosses Laborde Creek about 1,900 feet south of the southern
boundary of Site 2. This branching fault is interpreted to be related to the uplift of the Mount Eden
basement block. A major northwest-striking fault that dips northeast and is related to the San Jacinto Fault
Zone projects across the Laborde Canyon drainage about 300 feet south of Gilman Springs Road.
4.2
SHATTERED RIDGES
Fractured and brecciated rocks were seen on several ridge crests in Laborde Canyon (Photographs 5, 6, 7,
and 8). In the southern part of Laborde Canyon, the width of the fractured rock ranges from 50 to 90 feet.
The fractures appear to be co-seismic fractures resulting from seismic energy focused along the ridge
crests rather than the result of ground rupture along faults. Fractured ridge crests are common with high
ground acceleration earthquakes such as the San Fernando and North Palm Springs earthquakes, but not
in lower ground acceleration earthquakes such as the Landers and Hector Mine earthquakes.
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GROUNDWATER FLOW
GENERAL OBSERVATIONS REGARDING GROUNDWATER FLOW
Based on site characterization studies and the installation of numerous groundwater monitoring wells,
groundwater flow in Laborde Canyon is restricted to flow down Laborde Canyon itself, primarily within
the weathered portion of the STF. Groundwater flow is generally consistent with the direction of surface
water flow and topography. Water level measurements collected from monitoring wells across the site
suggest that flow is south through Laborde Canyon. Seasonal variations in groundwater levels appear to
be small. Hydrologic boundaries are assumed to coincide with the watershed boundaries, with the base of
the weathered STF acting as a leakage boundary into the more competent STF.
Based on the geologic mapping conducted as part of this investigation and the lack of any significant
faults that pass through the northern portion of the site, faults do not appear to significantly influence
groundwater flow down Laborde Canyon. Contaminant concentrations on the northeastern side of Test
Bay Canyon are higher than would otherwise be expected, which may be a consequence of enhanced
fault-related permeability. South of Site 2 proper, one curving fault is mapped across Laborde Canyon
approximately 1900 feet south of the southern Site boundary. It is not clear whether this fault influences
groundwater flow. Further characterization of Laborde Canyon south of the Site boundary is planned in
the near future.
5.2
GENERAL OBSERVATIONS REGARDING POROSITY AND PERMEABILITY OF
SEDIMENTARY ROCKS
In general, the porosity and permeability of the sedimentary rocks exposed within Laborde Canyon
decreases from north to south. The middle member of the STF, which is exposed mainly to the north of
Site 2, has a higher percentage of conglomerate and is more poorly-indurated that the lower member of
the STF, which is exposed throughout Laborde Canyon within Site 2. To the south of the Site 2 property
boundary, the lithologies of the MEF are well-indurated. Basement rocks exposed in the lower part of
Laborde Canyon are presumed to be the least permeable.
5.3
SURFACE WATER IN LOWER LABORDE CANYON
A small spring is located in lower Laborde Canyon, approximately 600 feet north-northwest of Gilman
Springs Road. The elevation of the spring discharge point is higher than the adjacent Laborde Canyon
drainage channel. The elevation of groundwater in nearby monitoring wells TT-MW2-19S/D and TTMW2-20S/D, which represents the groundwater flowing down Laborde Canyon from Site 2, is lower than
the Laborde Canyon drainage channel bottom throughout this reach (i.e., no water is observed within the
stream channel). The elevation difference between the spring discharge point and groundwater within the
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canyon (roughly 45 feet) suggests that water discharging at the spring is not groundwater flowing
downgradient from Site 2.
This investigation found no evidence of a fault that could explain the presence of the spring. The spring is
located near the contact between the MEF and the underlying basement rocks. On the western side of
Laborde Canyon, the contact between the basement rocks and sedimentary rocks is generally sheared,
which is interpreted to be a result of the rheological differences between the two rock types during
deformation. It is possible that the presence of the spring is related to the sheared contact between the
MEF and basement rocks, rather than faulting.
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REFERENCES
Blacet, P.M.
1959
Geology of the Lamb Canyon area: B.A. thesis, Riverside, California, University of
California, 41 p.
Dibblee, T.W., Jr..
2003a Geologic map of the El Casco Quadrangle, Riverside County, California: Santa Barbara,
California, Santa Barbara Museum of Natural History
2003
English, H.D.
1953
Fraser, D.M.
1931
Frick, C.
1921
Geologic map of the San Jacinto Quadrangle, Riverside County, California: Santa
Barbara, California, Santa Barbara Museum of Natural History
The geology of the San Timoteo Badlands, Riverside County, California: M.A. thesis,
Claremont, California, Claremont Graduate School, 99 p.
Geology of the San Jacinto quadrangle south of San Gorgonio Pass, California:
California Mining Bureau Report 27, p. 494-540.
Extinct Vertebrate Faunas of the Badlands of Bautista Creek and San Timoteo Cañon,
Southern California. University of California Publications, Bulletin of the Department of
Geology, Vol.12, No. 5, pp 277-424, University of California Press, Berkeley, California,
December 28.
Henderson, L.H.
1939 Detailed geological mapping and fault studies of the San Jacinto tunnel line and vicinity:
Journal of Geology, v. XX, p 314-?
Larsen, N.R.
1962
Geology of the Lamb Canyon area, Beaumont, California: M.A. thesis, Claremont,
California, Claremont Graduate School, 93 p
Leighton and Associates
1983 Hydrogeologic investigations for water resources development, Potrero Creek, Riverside
County, California: 25p.
Metropolitan Water District of Southern California (MWD)
1937 Geologic profile, progress, and tunnel discharge, San Jacinto Tunnel: unpublished
document
Matti, J.C. and Morton, D.M.
1993 Paleogeographic evolution of the San Andreas Fault in southern California: A
reconstruction based on a new cross-fault correlation, in Powell, R.E., Weldon, R.J., II,
and Matti, J.Cl, eds. The San Andreas Fault system: Displacement, reconstruction, and
geologic evolution: Geological Society of America Memoir 178, p. 107-159.
Morton, D.M., and Matti, J.C.
1993 Extension and contraction within an evolving divergent strike-slip fault complex: The San
Andreas and San Jacinto Fault Zones at their convergence in southern California, in
Powell, R.E., Weldon, R.J., II, and Matti, J.Cl. eds. The San Andreas Fault system:
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Displacement, reconstruction, and geologic evolution: Geological Society of America
Memoir 178, p. 217-230.
2001
Geologic map of the Lakeview 7.5’ quadrangle, Riverside County, California: U.S.
Geological Survey Open-File map 01-174
Morton, D.M., and Miller, F.K.
2006 Geologic map of the San Bernardino and Santa Ana 30’x60’ quadrangles, southern
California: U.S. Geological Survey Open-File Report 2006-1217.
Morton, D.M., and Sadler, P.M.
1989 Landslides flanking the northeastern Peninsular Ranges and in the San Gorgonio Pass
area of southern California: in, Sadler, P.M., and Morton, D.M., Landslides in a
semi-arid environment with emphasis on the inland valleys of southern California:
Publications of the Inland Geological Society, volume 2, p. 338-355.
Onderdonk, N.W.
1998 The tectonic structure of the Hot Springs fault zone, Riverside County: M.S. thesis, Santa
Barbara, California, University of California
Ransome, F.L.
1932 Final geological report on the San Jacinto tunnel line, Colorado River aqueduct: report
prepared for Metropolitan Water District of Southern California, 72 p.
Terra Physics Inc.
2008 Final report, Additional Seismic Refraction and Reflection Surveys to Detect San Timoteo
and Mount Eden Formation Topography and Structure, Former Lockheed Beaumont Site
2 and Wolfskill Property, South Beaumont, California, unpublished report, 22 p, figures
and tables.
Yule, D. and Sieh, K.
2003 Complexities of the San Andreas fault near San Gorgonio Pass: Implications for large
earthquakes: Journal of Geophysical Research, v. 108, No. B11, p. 2548 –
Aerial photographs examined
1938, 1948, 1962, 1974, 1980, 1984, 1990, 2000, 2005, 2009 Google Earth images
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ACRONYMS
LMC
Lockheed Martin Corporation
MEF
Mount Eden Formation
STF
San Timoteo formation
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Figures
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au lt
Mt. Eden
F au
La mb Ca
ny on
ont
C
la
J a re
c i mo
nt n
o tF
Fa a
ul ult
tZ
on
e)
ll a m
lt
LEGEND
r
La w
eF
enc
a ult
Fault Location
Mc
In n
e
Po
tre
ro
Beaumont Property Boundaries
Fa
Source: D. Morton, 2009.
Fa
ul
t
gs
an
a u lt
in
pr
lm
sF
ds
Be
Gi
ul
t
Sp
gs
u
Fa
rin
ult
Goe tz Fa
lt
De
B
R
oa
lla
d
nt
mo
u
Fa
Fa
u
Fa
u
Fa
lt
ul
Fa
u
Fa
ro
D
tre
lt
Po
San Jacinto
Mountains
u
Fa
ult
C
er
lt
w
Lo
lt A
lt
E
F
tZ
sa
e
on
Ca
Lo
m
a
Fa
t
ul
m
on
a
Ex
pr
es
sw
ay
Claremont Peak
So
San Jacinto
bo
ba
Ro
ad
Dellamont Peak
Beaumont Site 2
Figure 1
Sanderson Avenue
Ra
Warren Road
n
De
(S
a
Ro ad
Beaumont Site 1
Regional Fault Map, Lockheed
Beaumont Sites 1 and 2
Hot Springs Fault
bb
it T
rai
lR
oa
d
X:\GIS\Lockheed 23521-0502\Site 2_Geology.mxd
Tstm
ck
ra
Tstm
Ja
Tstm
Tstl
Tstl
Tstl
Tstm
Tstm
Tstl
Area J
Final Assembly
Qal
Building 250
Tstm
Tstl
Tstm
Tstl
s
Te
Area K
Test Bays and
Misc. Faciilities
C
ay
tB
n
yo
an
Regolith
Mt. Davis
Qal
Tstl
Qls
Tstl
Tstl
an
y
on
Kt
lC
Qaf
sp
Di
Qal
a
os
Tstl
Tstl
Kt
Area L
Propellant Burn Area
Tstl
Kt
Kt
Kt
Area M
Garbage Disposal Site
Tstl
Tstl
Kt
Eden Hot
Springs
Kt
Qal
Tstl
Tstl
Kt
Tstl
Qal
Mt. Eden
Tstl
Tstl
Qal
Tstl
Tme
Tme
Tme
Qls
Tme
Qls
Tme
Tme
Cl
a
Tstl
Tme
re
m
on
t
Mine
Fa
ul
t
Tstl
Qls
Tme
(S
an
Ja
ci
nt
o
Tmeb
Fa
ul
t
Mine
Zo
Tme
ne
)
Tme
Tmeb
Qal
PZ + Kg
Pz
Tme
Pz
Pz
Tme
Approximate Location of
Figure 3 Profile
Pz
Kt
Tme
Pz
oad
nR
Gi
lm
Mountain Peak
Fault, Accurately Located Showing Dip
Fault, Approximately Located
Bedding Strike and Dip, Approximate
Contact, Approximately Located
Historical Operational Area Boundary
Beaumont Site 2 Property Boundary
Qaf
Qal
Qls
Tstm
Tstl
Tme
Tmeb
Kg
an
Sp
r in
gs
- Artificial Fill
- Undifferentiated Quaternary alluvial deposits along canyon floors
- Quaternary landslide deposits
- Middle member of the San Timoteo formation
0
- Lower member of the San Timoteo formation
- Undifferentiated Mount Eden formation
- Tonalite breccia deposits of the Mount Eden formation
- Cretaceous biotite monzogranite
Kt - Cretaceous biotite-hornblende tonalite and hornblende-biotite tonalite
Pz - Undifferentiated Paleozoic schist, gneiss, and marble
R
La
Tme
Tme
LEGEND
m
b
C
yo
an
oa
d
Beaumont Site 2
Figure 2
1,000
2,000
Feet
Source: D. Morton, 2009.
Geologic Map
Lockheed Beaumont Site 2
X:\GIS\Lockheed 23521-0502\Viewpoints_Site B2.mxd
Photo 2
Photo 3
Ja
ck
ra
bb
it T
rai
lR
oa
d
Photo 4
Area J
Final Assembly
Building 250
s
Te
Area K
Test Bays and
Misc. Faciilities
tB
ay
ny
Ca
on
lC
an
yo
n
Mt. Davis
Photo 1
o
sp
Di
sa
Area L
Propellant Burn Area
Area M
Garbage Disposal Site
Eden Hot
Springs
Mt. Eden
Cl
a
re
m
on
t
Mine
Fa
ul
t
(S
an
Ja
ci
nt
o
Fa
ul
t
Mine
Zo
ne
)
Photos 5 & 6
oad
nR
La
m
b
C
yo
an
Photos 7 & 8
Gi
lm
an
Sp
r in
gs
R
oa
d
Beaumont Site 2
LEGEND
Photo Location
Figure 3
Mountain Peak
0
Historical Operational Area Boundary
1,000
2,000
Feet
Beaumont Site 2 Property Boundary
Source: D. Morton, 2009.
Photo Location Map
Photographs
TETRA TECH, INC.
NOVEMBER 2009
Photograph 1. Small, low angle south-dipping fault in STF. Location is on the west side of Laborde Canyon south of
‘Test Bay’ canyon near well TT-MW2-2S. View looking west.
Photograph 2. Fault exposed on Jackrabbit Trail Road that probably projects into northern linear canyon in Site 2.
Site 2 Lineament Study
2
TETRA TECH, INC.
NOVEMBER 2009
Photograph 3. Fault exposed on Jackrabbit Trail Road that probably projects into second northern linear canyon in
Site 2.
Photograph 4. Fault exposed on Jackrabbit Trail Road that probably projects into ‘Test Bay Canyon” in Site 2
Site 2 Lineament Study
3
TETRA TECH, INC.
NOVEMBER 2009
Photographs 5, 6. Photograph of part of shattered ridge near northern exposure of MEF on the east side of the
basement hill on the west side of Laborde Canyon.
Site 2 Lineament Study
4
TETRA TECH, INC.
NOVEMBER 2009
Photographs 7, 8. Photographs of part of shattered ridge in MEF west of the mouth of Laborde Canyon.
Site 2 Lineament Study
5