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GLGIA10 - Practical 9 Student Name and Number: 10. Locate the deposit Qaf. What is it? Day of Practical: Mon Thur Fri 11. The central portion of the geological map is enlarged in Figure 4.6. Damage in Vista Grande Heights and the San Jose Highlands is indicated as: a. b. c. 12. Would you expect Noble School to be damaged in the future because of foundation failure (refer to Figure 4.5)? Explain. 13. Note that a road in the subdivision had to be abandoned. What road was extended to accommodate the traffic? 14. In what subdivision are badly damaged and abandoned houses? 15. Would you purchase a house on the north side of Boulder Drive, east of Sophist Drive (see Figure 4.5, 4.6)? Explain. 16. Why are the utility lines (telephone and power cables) above ground on the west side of Boulder Drive (refer to Figure 4.5)? 17. Money and resources are being used to make this region habitable. What solutions might be appropriate?
Figure 4.5: Geological map of landslides and surficial deposits. BOURDARY SANDRE V By 6 WA ERE See Qal tai H RUNA Jee damage hap above y Pied Cay nbpp Teen the AVE MCA VISTA LAME Peyil W POLO EXO SAN JOU COUNT CREEK 000 Qal AN SK Upper BA SAN JOSE OM 154 Me seh Rode wond farbe damager MOKEE COM 218 HVAD Alum Rock 121" 50'00" 1000 3000 1000 5000 000 Figure 4.5. Landslide and other surficial 1000 deposits in northeastern San LEH Jose, California. (USGS) INILOMETER CONTOUR INTERVAL 40 FEET DOTTED LINES REPRESENT 10 FOOT CONTOORS DATUM IS MEAN SEA LEVEL LENGTH CONVERSION: 1 mile = 1.609344 kilometers, 1 foot = 0.3048 meters NOTE: To measure kilometers - use the kilometer scale on the map. Print this page at A4 size - do not reduce!
GLGIA10 - Practical 9 Student Name and Number: Legend of the geological map on the previous page. Day of Practical: Mon Thur Fri Legend for Figure 4.5 Qal a Alluvial deposits Irregularly stratified, poorly consolidated deposits of mud, silt, sand, and gravel deposited in stream and river beds and on adjoining flood plains. luvial deposits less than about 200 feet wide, common along smaller streams, generally have not been mapped, where colluvial deposits are adjacent to such narrow strips, the alluvial deposits have been included with them. Includes older and younger alluvial fan deposits that form broad, exten. sive, gently sloping surfaces composed of coalesced large alluvial fans that border upland areas. Deposition is con- tinuing on the younger parts of these fan complexes as well in the major alluvial channels that cut across the fan surfaces. Landslide deposits Arrows indicate general direction of downstope movements queried where identification is uncertain Debris composed of fresh and weathered rock frag ments, sediment, colluvial material, and artificial fill, or any combinations thereof, that has been transported downslope by falling, sliding, rotational slumping, or flow- ing. Landslide deposits smaller than approximately 200 feet in longest dimension are not shown on the map. Complex landslide deposits, which result from combina tions of different types of downlope movement, are per haps the most common type of landslide deposit in the bay region. In particular, materials near the head of landslide deposits typically move in a different manner than materials at the toe. The landslide deposits shown on this map have not been classified according to either type of movement or type of material of which the de- posit is composed. The deposits very in appearance from clearly discernible, largely unweathered and unereded topographic features to indistinct, highly weathered and eroded features recognizable only by their characteristic topographic configurations. The ne of formation of the mapped landslide deposits ranges from possibly a few hundred thousand years ago to 1970. No landslide deposits that formed since 1970 are shown. The thick ness of the landslide deposits may vary from about 10 feet to several hundred feet. The larger deposits are gen. erally thickest; many small deposits may be very thin and may involve only surficial materials. Colluvial deposits and small alluvial fan deposits Colluvial deposits: unstratified or poorly stratified, un consolidated to poorly consolidated deposits com- posed of fresh and weathered rock fragments, or ganic material, sediments, or irregular mixtures of these materials that accumulate by the slow down slope movement or surficial material predominantly by the action of gravity, but assisted by running water that is not concentrated into channels. Collu vial deposits have been mapped only where they form a distinct apron near the base of slopes or where they fill and flatten canyon, ravine, and val. ley bottoms. Colluvial deposits are probably form ing on almost every slope in the bay region, but only the thicker and extensive accumulations that are recognizable on aerial photographs have been mapped. In some narrow stream valleys, colluvial deposits include alluvial deposits. Colluvial deposits may move downslope along the axes of ravines and may form fan-shaped deposits where they emerge onto more gently sloping valley floors. Small alluvial fan deposits: irregularly stratified, uncon. solidated to poorly consolidated, fan-shaped ac cumulations of water-laid sediment formed where narrow canyons emerge onto more gently sloping valley floors. The fan sediments are composed of mud, silt, clay, and gravel deposited by streams and thin water-rich mudflows. These deposits commonly grade upslope into colluvial deposits and may be in terbedded with them. Bedrock (queried where identification uncertain) Igneous, metamorphic, and sedimentary rocks of various ages, physical properties, and engineering charac teristics. Areas not shown on the map as covered with surficial deposits probably contain bedrock either exposed at the surface or mantled by a thin veneer of surficial de posits, most commonly colluvial material. The bedrock is commonly weathered to a considerable depth, so that there is a gradual change downward from highly weather ed organic-rich soil to fresh bedrock. Thus, many of the small landslide deposits and some of the large landslide deposits that are shown on the map to lie within bed rock areas probably involve only material derived from weathered bedrock and other colluvial material. Qaf Artificial fill Highway, railroud, and canal fills composed of rock and soil derived from nearby cuts or quarries; only large fill areas are shown on the map. Print this page at A4 size - do not reduce!
of St. LINE Student Name and Number: GLGIAIO - Practical 9 SAN JOSE pat Lost HIGHLANDS VINCES CALIFORNIA DEPARTMENT OF WATER RESOURCES SOUTH BAY AQUEDUCT TERMINAL BESERVOIL ASPHALT ABLON SOUND WATER TANK OKSET SIVE WORKS GIVE -STAFETS BABLY DAMAGED AVE PROPOSE LOCATION FOR SANTA CLARA COUNTY FLOOD CONTROL WATER DISTRICT VATER TREATMENT PLANT SAN JOSE VATER WORKS VATER STORAGE FACILITY UTILITY LINES ABOVE GBOUW SUSREST CLAITOA Print this page at A4 size VAY LOUSES BADLY DAMAGES AND ARAMOWE VHEMEN Figure 4.6: Detailed map of the central portion of the geological map. VISTA GRANDE HEIGHTS NOBLE SCHOOL PIEMONT CAM BAMAGED ANS ABANDONED NOBLE GECE WITAM ILMAZ ROAD CEELE PENITENCIA do not reduce! BOAD 2000 FEET 1000 PROXIMATE SALE ته Curt broken or offset at joints Road damaged House damaged The durage observed appeared to be or in some cases definitely ts, related to lands 11 de novement. No comparable danage was observed outside of the area mapped as landslides. Several of the roads, curbs, and houses within the land- slide areas were checked and had no apparent damage, but more torough survey must be made before the extent of the donage can be fully assessed. Observations of damage were made during 2 days of field checks in July and September 1971. Damage repaired before these dates is not shown on the rap. Day of Practical: Mon Thur Fri Figure 4.6. Map showing damage observed in July and September, 1971. (USGS)
Figure 4.5: Geological map of landslides and surficial deposits. MOURARY SSAN Choo h10 . R U Qa! Hi Nords ee damage hap above Plen nebo The Web NOVO Peyil RIOR SAN JOSE COS பாகம் - Upper Qal SAN JOSE AVE stul AM 150 Malum WWE Rodd and laurb.damagei BA EM EM 215 Alum Rock 121° 50'00" 3000 CO Figure 4.6. Landslide and other surficial 1000 deposits in northeastern San TT Jose, California (USGS) 1 I WILOMETER CONTOUR INTERVAL 40 FEET DOTTED LINES REPRESENT 10 FOOT CONTOURS DATUM IS MEAN SEA LEVEL
LINE DE soas SAN JOSE HIGHLANDS PER NCREST SSIVE ఆగాక air of Starrer cow.cates app COMME CALIFORNIA DEPARTMENT OF WATER RESOURCES SOUTH BAY AQUEDUCT TERMINAL RESERVOIR ASPHALT AQON AROUND VATER TANK OFFSIT SITZ INCHES P2000SED LOCATION FOR SAN JOSE VATER WORKS SANTA CLARA COUNTY FLOOD VATER STORAGE CONTROL WATER DISTRICT FACILITY VATTA TARATMENT PLANT STREETS BADLY DAMAGED UTILITY LINES ABOVE GROUND CLAITOR MOUSES BADLY DAMAGED AN ABANDONED VISTA GRANDE HEIGHTS NE ROAD SALLY DAMAGED ANG ABANDONED AVE ROAD GREE CEZEK PENITENCIA PENITENCIA 2000 FEET 1000 L APPROXIMATE SCALE set at Soints The darage observed appeared to be, or in some cases definitely is, to Tands 11 de novenent. No comparable danage was observed outside of the mapped as Tandslides. Several of the roads, curbs, and houses within the side areas were checked and had no apparent cara ge, but a more thorough must be made before the extent of the darage can be fully assessed. Observations of damage were made during 2 days of field checks in Jul September 1971. Damage repaired before those dates is not shown on the ra
GLG1A10 - Practical 9 Student Name and Number: Day of Practical: Mon Thur Fri Figure 4.5: Geological map of landslides and surficial deposits. BOUNDARY SAN JOSE mono Road Water 22 B U Qal Timent на Hochsch PIEPHON ROAD UND ...is Eagle Rook DONE ee damage nap above? Soos Piedmond SCH OM 26 Y:: 1:02 BM 21 AVE Toyon Sch LANE Pewie DR GOLE SAN PABLO BOR- SAN JOSE COUNTRY DR PEPPEB.TRE Qal 60L MACENSION BM Upper NITEANA SAN JOSE I DR Miguel BM 154 McCollam Sch .. ye BoddaAnd larb damagei 130 Pinte 2000 LABURY MCKEE ем 218 BM Alum Rock Sheppard Sch 178 121° 50'00" 9 1000 2000 SO 4000 5000 6000 Figure 4.5. Landslide and oth surficial 1000 0 TE deposits in northeastern San Jose, California. (USGS) 7000 FEET KILOMETER 5 0 CONTOUR INTERVAL 40 FEET DOTTED LINES REPRESENT 10 FOOT CONTOURS DATUM IS MEAN SEA LEVEL LENGTH CONVERSION: 1 mile = 1.609344 kilometers, 1 foot = 0.3048 meters NOTE: To measure Kilometers u the line
f Drive extension LANE location of Suncreste Figure 4.6: Detailed map (MYLIND DR SAN JOSE PERIE SOPHIST HIGHLANDS DRIVE w== - Approximat SUNCRE w CREST CALIFORNIA DEPARTMENT OF WATER RESOURCES SOUTH BAY AQUEDUCT TERMINAL RESERVOIR ASPHALT APRON AROUND WATER TANK OFFSET SEVERAL INCHE5 DRIVE STREETS BADLY DAMAGED SAN JOSE WATER WORKS WATER STORAGE FACILITY UTILITY LINES ABOVE GROUND PROPOSED LOCATION FOR SANTA CLARA COUNTY FLOOD CONTROL & WATER DISTRICT WATER TREATMENT PLANT AVEC CLAITOR SUNCREST SS HOUSES BADLY DAMADED AND ABANDONED VAY 园 VHITMAN VISTA GRANDE HEIGHTS VISTA DEL VALLE NOBLE SCHOOL w ROAD BADLY DAMAGED AND ABANDONED PIEDMONT NOBLE VISTA OAK wu AVE EL GRANDE CREEK ROAD CREEK PENITENCIA PENITENCIA ROAD 2000 FEET 1000 APPROXIMATE SCALE Curb broken or offset at joints The damage observed appeared to be, or some cases definitely is, related to landslide movement. No comparable damage was observed outside of the area mapped as landslides. Several of the roads, curbs, and houses within the land- slide areas were checked and had no apparent damage, but a more thorough survey must be made before the extent of the damage can be fully assessed. Observations of damage were made during 2 days of field checks in July and September 1971. Damage repaired before those dates is not shown on the map. A Road damaged House damaged Figure 4.6. Map showing damage observed in July and September, 1971. (USGS)