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Home My WebLink AboutGROUND MOVEMENT POTENTIAL MAP: SARATOGA 2013GROUND MOVEMENT POTENTIAL MAP CITY OF SARATOGA, CALIFORNIA SPHERE OF INFLUENCE BOUNDARY Pd Pd Ps —=f Pd Ps Sun Md CITY LIMITS Pd Ms% Sb v tl Sbr r. _- _ Ps PsPs 1:7 sb% Ps Pdf. I00444N14110111114Y41 wilkitirniter. 011, II 111. 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IJk(A ITY LIMITS SPHERE OF INFLUENCE BOUNDARY Relatively Stable Ground Sbr Sun Sls EXPLANATION Level ground to moderately steep slopes underlain by bedrock within approximately three feet of the ground surface or less; relatively thin soil mantle may be subject to shallow landsliding, settlement, and soil creep Unconsolidated granular material (alluvium, slope wash, and thick soil) on level ground and gentle slopes; subject to settlement and soil creep; liquefaction possible at valley floor sites during strong earthquakes Naturally stabilized ancient landslide debris on gentle to moderately steep slopes; subject to settlement and soil creep Areas with Significant Potential for Ground Movement Pmw Paf Pdf Steep to very steep slopes generally underlain by weathered and fractured bedrock subject to mass -wasting by rockfall, slumping, and raveling Areas of artificial fill materials subject to localized settlement and/or potential landsliding on moderately steep to steep ground and where placement may not have met engineering specifications Unstable, unconsolidated material, commonly less than 10 feet in thickness, on gentle to moderately steep slopes subject to shallow landlsiding, slumping, settlement, and soil creep Liquefaction hazard zones as mapped by the Califomia Geological Survey depicted by stipple Unstable, unconsolidated material, commonly more than 10 feet in thickness, on moderate to steep slopes; subject to deep landsliding Debris flows (shallow, rapidity moving landslides) including recognized source areas and flow paths. Depositional runout areas may not be fully depicted Areas with Potential for Primary Fault Rupture Zone of potential primary surface fault rupture V - -y Potentially active fault traces Unstable Ground Characterized by Seasonally Active Downslope Movement Moving shallow landslides, commonly less than 10 feet in thickness Moving deep landslides, commonly more than 10 feet in thickness Sbr Pdf PREVIOUS CITY SOURCE MAPS NOTE TO USERS: This is an interpretive map derived both from the Geologic Maps of the City of Saratoga and from additional field observations and geologic experience in the Saratoga region. All boundaries between zones are located approximately. Information on this map is NOT sufficient to serve as a substitute for detailed, site-specific geologic and geotechnical investigations necessary for construction. Mapping illustrates the relative stability or movement potential, in the Saratoga area, of ground in its natural undisturbed state. Works of man may seriously atter the natural stability of the ground. This map is an update and expansion of the Initial Movement Potential of Undisturbed Ground Maps prepared by Terratech (1985), William Cotton and Associates, Inc. (1977), and William Cotton and Associates, Inc. (1980). Alignment of the Berrocal Fault reflects results of site specific fault investigations submitted to the City and cracking of ground observed after the Loma Prieta Earthquake (1989). Alignments of the Monta Vista and Shannon Faults reflect consideration of mapping by Rogers and Williams (1974) and Herd (1980) and Bedrossian (1980a). City limits and parcels are approximate and should not be used to determine property boundaries or relied upon for topographic purposes. Approximations of road alingments are indicated as dashed lines and were added to the City Parcel and Street base layer (2005) for illustrative purposes. The map utilizes a 2006 topographic base map with depicted contour intervals of 20 feet. SPHERE OF INFLUENCE BOUNDARY 0 300 600 1.200 1.800 Feet 2.400 1: Congress Springs Study Area William Cotton and Associates (1977) 2: Upper Calabasas Creek Watershed William Cotton and Associates (1980) 3: Lower Saratoga Hillside Area Terratech (1985) 4: Saratoga Map Update Areas Cotton, Shires and Associates, Inc. (2013) rai COTTON, SHIRES AND ASSOCIATES, INC. CONSULTING ENGINEERS AND GEOLOGISTS GROUND MOVEMENT POTENTIAL MAP City of Saratoga, California GEO/ENG BY JN/PJ SCALE AS SHOWN PROJECT NO. G5042 APPROVED BY TS DATE APRIL 2013 PLATE NO. 1 of 1