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HomeMy WebLinkAboutCT 73-29; Carrillo Ranch; Feasibility Study; 1979-08-21W.O. 109-SD August 21, 197a . CARRILLO RANCH Landslide and Development Feasibility Study, Parcels b, c, e, f, h-3, i-2, j. City of Carlsbad, California. For Daon Corporation GeoSoils, Inc. r- 1446 East Chestnut Avenue * Santa Ana, California 92701 * (714) 547-6703 August 17, 1979 W.O. 109-SD Daon Corporation 4041 MacArthur Boulevard Building "A"- 3rd. Floor Newport Beach, California 92660 Attention: Mr. Mike Ryan Subject : Landslide and Development Feasibility Study, Parcels b, c, e, f, h-3, i-2, and j, Carrillo Ranch area, City of Carlsbad, California. Reference: (1) "Report of PrePreliminary Geotechnical Eastern and Southern Parcels Carlsbad, Investigation Carrillo Ranch Project Associates, Inc., Dated January 10, 1979 (S.E.A.) California", By Shepardson Engineering (2) "Limited Landslide Investigation, Carrillo Ranch Project, Carlsbad, California." BY Shepardson Engineering Associates, (S.E.A.) Inc., Dated January 26, 1979. - Gentlemen: " The following report presents the results of our landslide investigation - City of Carlsbad, California. Seven Parcels comprise the total on the subject properties, located within the Carrillo Ranch area study area and total approximately 435 2 acres. - The primary purpose of this investigation was to verify the extent of landsliding on the subject property and to collect geotechnical parameters needed for landslide analysis and stabilization Concepts. In addition, this study was intended to develop initial Soils - - engineering and geological factors as related to site development planning. - - Daon Corporation Page 2 W.O. 109-SD August 17, 1979 SCOPE OF SERVICES Information contained within this report is the summation of the following: 1. Review of previous reports (see Appendix). 2. Analysis of aerial photographs. 3. Surficial mapping. 4. Boring and Trench exploration, to provide subsurface 5. Landslide analysis. geologic information. Exploratory borings were excavated in order to obtain information concerning geometry, strength parameters and depth of sliding. Exploratory trenches were also excavated to further define limits of sliding, geologic contacts and the nature of subsurface materials underlying the study area. Included within this report is a geologic map (Plate I) and structure Sections, Plate I1 & I11 which illustrate the approximate aerial distribution of geologic units, surficial deposits, landslides and the locations of exploratory trenches and borings. The base topographic map was provided by Rick Engineering and was drawn to a scale of one inch equals 200 hundred feet, utilizing a contour interval of five feet. The cross sections are drawn to a scale of one inch equals 100 feet. FIELD EXPLORATION Subsurface exploration of the site was performed in two phases begining in June, 1979 and ending in July, 1979. Initially, four borings were drilled to verify the presence of landslides and to define their depth. Eventually this study resulted in the excavation of 20 borings ranging in depth from eight to 81 feet. Additional data was obtained by excavating 24 backhoe pits to depths of up to 14 feet. The approximate locations of the borings and backhoe GeoSoiIs, Inc. ! - Daon Corporation - Page 3 August 17, 1979 W.O. 109-SD trenches are shown on the Geologic Map, Plate I and the logs are presented in Appendix A. Drilling of the borings and excavation of pits were supervised by our staff geologist. The borings were drilled with bucket type drilling rig. Periodic "Undistrubed" split-spoon type samples and bulk samples of the materials encountered in the borings were obtained. Previous exploration by Shepardson Engineering Associates, Inc. was reviewed. For convience, their seven boring logs and 27 trench logs are included at the end of this report as Appendix B. The approximate locations of these explorations are shown on Plate I. DESCRIPTION OF STUDY AREA The study area consists of approximately 435f acres located south of Palomar Airport Road and east of El Camino Real. The site occurs in the easterly portion of the City of Carlsbad and is a portion of the Carrillo Ranch. A site location map is presented herein as Figure I. The site occurs primarily along the north flank of a prominent southwest trending ridge and faces a major canyon which drains westerly. Two large canyons and other smaller gullies have incised into the ridae flank and drain north and northwest into the major canyon. A portion of the study area extends across the canyon and borders Palomar Airport Road. Natural slopes vary from approximately 6:l (horizontal to vertical) to nearly 2:l. Locally more gentle slopes occur along the larger tributary canyons with steeper slopes along the smaller gullies. Maximum relief over the site ranges from approximately 550 feet at the southeastern boundary to approximately 175 feet near the western boundary. While most of the area has been previously cultivated or disced, at present, a thick growth of grasses and tall GeoSoiIs, Inc. SITE LOCATION MAP I Soil Mechanics Geology Foundation Engineering - - Daon Corporation - Page 4 August 17, 1979 W.O. 109-SD weeds cover the lower slopes. Scrub oak occur on many of the higher slopes in the southern portions of the property. Structures and improvements within the study area include the historic Carrillo Ranch site, a dam and reservior, main trunk sewer line and several unimproved roads. A paved road extends from Palomar Airport Road to the Ranch facilities. The ranch site is situated in the major canyon, within the central portion of the study area. This historic site is owned and maintained by the City of Carlsbad. The dam and reservior lies several hundred feet northeast of the ranch, see Plate I. The trunk sewer line parallels the north bank of the creek within the major canyon. Fill possibly associated with the installation of the trunk sewer line exists near the northwest boundary. This fill deposit was previously reported and estimated to be approximately 10 feet thick and moderately compacted. In addition, fill was also used to construct the dam within the major canyon. The fill materials appear to be locally derived, consisting of a mixture of sands and clays. Topsoil Topsoils on the site consist primarily of dark brown silty clays. Generally, these soils vary from 2 to 4 feet thick. Conglomerates underlying the study area have produced a topsoil mantle consisting primarily of cobbles and boulders with a clayey matrix. Thick topsoil type accumulations also occur along the back of landslides, as graben infillings. The topsoils currently vary from dry to moist. These materials may be used as compacted fill, although they are regarded as highly expansive in nature. The topsoils are low in density and should be removed from all excavations and fill areas. GeoSoils, Inc. i " - Daon Corporation - Alluvial Deposits (Map symbol-Qal) Page 5 August 17, 1979 W.O. 109-SD Alluvial deposits represent accumulations of soils within the main and tributary canyons. These deposits have been washed from the surrounding slopes and therefore are composed of local materials (mostly cohesive), which are poorly consolidated. In addition,it should be anticipated that some colluvium will exist along smaller canyons, gullies and side slopes beyond those deposits mapped as alluvium. Within the small canyons, these deposits may vary from 5 to 10 feet thick; in the area of the larger tributary canyon southeast of the ranch facilities, the alluvium is expected to range from 15 to 25 feet in depth; and in the major canyon the alluvium may extend from 25 to 35 feet deep. In general, alluvium and colluvium should be removed from areas to receive fill or used for structural support. The major canyon alluvium is wet and soft and settlement would be anticipated if loaded. All these materials may be reused for compacted fill and they are regarded as expansive. Approximately the southern two thirds of the site is underlain by claystones and sandstones of the Del Mar Formation. Sandstones (Tds) occur mainly along the upper slopes while interbedded claystone and sandstone (Tdc-s) occur along the mid-slope areas. The claystones and sandstones also extend along the eastern and northern portions of the study area. Sandstones are generally dense and often contain a clayey matrix Claystones are typically hard, but susceptible to landsliding. Claystones and clayey sandstone would be regarded as expansive. .- Daon Corporation - Page 6 W.O. 109-SD August 17, 1979 Light to moderate ripping may be expected within the Del Mar Formation, although occassional cemented layers may be encountered which would require difficult ripping. Blasting is not anticipated. Lusardi Formation (map symbol - K1) The Lusardi Formation represents a thick conglomerate or accumu- lation of cobble to boulder size rock fragments. This formation underlies the Del Mar Formation and is also exposed in the eastern and northern portions of the study area. The conglomerate may contain up to 10 percent of materials in excess of eight inches. The maximum size of the boulders appears to be approximately 3 to 4 feet. Special handling may be necessary to properly place the oversized rock in compacted fill areas. Heavy ripping difficulty is anticipated. The conglomerate contains a clayey sandstone to sandy mudstone matrix which appears to be expansive. Grantic Rock (Kgr) Granodiorites, reprensenting a portion of the Southern California Batholith, occur locally along the eastern edge of the study area. Generally, the granodiorite locally weatheres to sitly, medium to coarse grained sand, interspersed with the massive boulders. Excavation within the granodiorites would create a rock disposal problem and blasting may be necessary to achieve final grades or slopes. Steep cut and fill slopes may be formed with these materials. The soils are not regarded as expansive due to their granular nature. Santiago Peak Volcanics (Jsp) Limited exposures of meta volcanics occur near the southwestern boundary of the study area. The volcanics are of an andesite composition and are very hard and highly fractured. CeoSoits, Inc. - - Daon Corporation - Page 7 August 17, 1979 W.O. 109-SD Difficult ripping and possible blasting should be expected within the volcanics. Resulting soils would be rocky and non-expansive, GEOLOGIC STRUCTURE The main structure of the area appears to be characterized by a broad, northwest to west trending syncline. The sedimentary strata of the Del Mar Formation tend to be gradational, lenticular and interfingering. While surface ourcrops are sparse, subsurface information, in general, indicates bedding to be gently to moderately dipping toward the north and northwest. Studies of adjacent parcels, to the northwest, reveal bedding to be moderately dipping to the southwest. GROUNDWATER Subsurface exploration in the alluvial areas of the major canyon, revealed that groundwater exists at depths of five to 30 feet below existing ground. In most cases, an artesian condition existed causing the water to rise to at or near the surface. The water depths encountered and depths to which the water rose are indicated on the geologic map. It is expected that water levels will fluctuate, due to seasonal and the existing reserv0i.r may be supplying much of the water conditions. Water seepage was also encountered in several borings. These perched conditions have developed due to permeability contrasts between the interlayered soil types and/or as fractured zones within the landslides. Much of the recently observed seepage may exist from winter rainfall, but would be expected to continue under landscape irrigation. For the most part, perched water was contained within sand beds overlying a more cohesive strata and within the landslide fracture zones. CeoSoils, Inc. - Daon Corporation - Page 8 W.O. 109-SD August 17, 1979 LANDSLIDES Extensive landsliding is evident within the south-central portion of the study area. Landslides mainly occur along the north facing slope and side slopes within the larger canyon. The approximate locations of these features based on field mapping, aerial photographs and subsurface exploration are shown on the Geologic Map (Plate I). Structure sections A-A' through 1-1' (Plates I1 and 111) have been drawn through the major landslides to illustrate their surficial relationships, and subsurface geometry as defined by our exploratory boring and trench pits. Landslides within the study area can be categorized as composite- failure slides with gently dipping basal slide planes or as partially rotational features with arcuate slide surfaces. The main slide area underlying the north facing slope occurs not as one large single mass, but as a complex assemblage of super- imposed slide masses.(see structure sections E-E', F-F', G-GI.1 These probably occurred as regressive landslides, in which continual headward sliding takes place after an initial failure near the canyon bottom, creates an unstable situation upslope. In many instances subsequent sliding resulted in overriding of the lower slides. Exploratory borings in this area verified slide planes to range from 20 2 to 70f feet in depth. Structure sections E-E' and G-G' indicate the toe of the basal slide to extend into the creek of the major canyon and to be partially buried by more recent alluvium. Landslides underlying the side slopes of the larger canyon display similiar characteristics and are illustrated by sections C-C', D-D'. H-H'. and 1-1'. GeoSoiIs, Inc. - Daon Corporation - Page 9 August 17, 1979 W.O. 109-SD The landsliding has consistantly occurred within the clayey portions of the Del Mar Formation. Slide planes observed in borings are generally soft clay with well developed polished and striated surfaces. Typically, the overlying slide mass is intensely disturbed with shears, fractures, weathered and moist zones and punky to friable zones. In contrast, the underlying bedrock is hard. The cause of landsliding is probably related to a combination of factors including adverse bedding conditions resulting from the regional synclinal structure and excessive moisture conditions as occurred during the Pleistocene era. Deterioration and softening of the clay materials, seepage forces, oversteepening of canyon sidewalls and possible seismic events may have also combined to affect instability. Subsequently, infilling of graben areas and erosion have partially modified the surficial appearance of the slides. LANDSLIDE STABILIZATION Stabilization of the landslides may be accomplished by a combination of several methods. These include: Burial, removal and the use of shear keys and/or buttresses. A brief desciption of these procedures are provided below. Burial Landslides which are situated within enclosed canyon areas may be adequately stabilized by filling the canyon. The amount of filling must be specifically desiqned for each slide area by the ensineer . Removal This includes either complete removal of the landslide or partial removal of the landslide to render the remainder stable. Partial removal is best accomplished in combination with one of the methods below. CeoSoiIs. Inc. I- I Daon Corporation W.O. 109-SD Page 10 August 17, 1979 Shear Key A shear is similar to a buttress, except that removal involves excavating into the landslide mass such that a deep trench is created. The trench or shear key penetrates the slide plane and subsequent filling with compacted fill resists movement. The resisting width of the shear key is designed by the engineer. Buttress A butress or earthfill retaining wall may be used to prevent future movement. This method calls for the removal of the lower portion of the landslide and constructing a compacted fill slope with a key section specifically designed to resist slide movement. Landslides along the large canyon side slopes can best be stabilized by placing fill within the canyon. The fill would act as a buttress, partially burying the landslides. At structure sections B-B' and C-C' preliminary analysis indicate a fill depth of 55 feet from the base of the canyon will be needed to effectively resist the slide forces. The landslide illustrated in structure section 1-1' would require a shear key of approximately a 100 feet in width within the lower portion of the slide to achieve stabilization. Sections E-E', F-F' and G-G' illustrate the landslide underlying the north facing slope. Slides in this area are complex with slides superimposed upon one another. Preliminary analysis indicate stabilization of the basal slide mass in this area will require approximately 40 feet of fill and a buttress key on the order of 150 feet in width that would extend across the entire toe of slope for approximately 900 feet and blending into the large canyon fill. CeoSoiIs, Inc. I - Daon Corporation Page 11 August 17, 1979 W.O. 109-SD The approximate location of the shear keys and buttresses are illustrated on Plate la and cross sections, Plates 2a and 3a. These designs are preliminary and would vary with the grading configuration. It should be noted that cutting material away from the head of the slide would tend to increase stability. Additional buttressing and/or removal of other superimposed landslides should be anticipated. The extent of this can only be designed when the approximate grades are determined. Surficial removals of graben deposits and highly disturbed bedrock will have to be determined in the field. Because of the nature of the slide masses and the generaly north dipping bedding, most cut slopes may require stabilization. Additional subsurface exploration should be performed after a final grading plan has been adopted in order to provide the most effective stabilization design for each area affected. OTHER ENGINEERING CONSIDERATIONS Based on our investigation, the subject property may be safely developed. As a guide to planning, we have provided the soils engineering parameters which would tend to affect earthwork and development. These quantities are based on our laboratory testing of the site materials, and experience with similar materials. Site Preparation Dense vegetation, should be removed and wasted from the site. Topsoil, colluvium, surficial alluvium and unsuitable fill deposits should be removed prior to fill placement. Deep alluvium within the major canyon may need to be removed prior to fill placement. All the materials may be reused as compacted fill. Large boulders should be wasted from the site; or broken up into usable size materials; or buried in deep fill using special rock disposal methods CeoSoils, Inc. .- " Daon Corporation Compacted Fill Page 12 August 17, 1979 W.O. 109-SD The site materials available for compacted fill include all the bedrock materials, alluvial, colluvial and fill deposits. These materials are expected to produce compacted fill with adequate strength to support residential structures and moderate slope heights. Slide materials may have a high moisture content and some difficulty in compaction may be encountered. Slopes Cut and fill slopes may be graded in most of the formati on to moderate heights and gradients up to 2:l (horizontal to s al material vertical). The clayey portion of Del Mar Formation would be the weakest material and some height limitation may be necessary depending upon future engineering calculations. Portions of the sandstones may be slightly susceptible to erosion. It should be anticipated that a majority of all cut slopes will probably require stabilization. Excavation Characteristics The bedrock materials, in general, may be excavated with conventional earthmoving equipment using light to moderate ripping. Some difficult ripping may be expected in occasional cemented layers, and within the granites and volcanics. The Lusardi Conglomerate would tend to be difficult to excavate due to the dense rock accumulation. Earthwork Balance The following preliminary bulk and shrinkage factors may be estimated for planning purposes: GeoSoils, Inc. " Daon Corporation - Page 13 W.O. 109-SD August 17, 1979 Topsoil and Fill - 15-20% shrinkage Alluvium and Colluvium- 10-20% shrinkage Landslide Debris - 5 -10% shrinkage Del Mar Formation - 2% shrinkage - 2% bulking Lusardi Conglomerate - 0-2% bulking Expansive Soils The site materials vary from sands to clays with expansive characteristics varying from non-expansive to highly expansive, and in some cases critically expansive. Since much of the materials tend to be interbedded, the soil mixture resulting will vary in the mid to high expansive range. It may be possible to selectively grade the sandstone unit to reduce the foundation reinforcement requirements on many pads. Sulfate Content Analysis of the soils can be used to select the proper type of concrete to avoid concrete deterioration. The bedrock materials are considered to contain a low to moderate content of soluble sulfates. Testing at completion of pad grades should be performed to determine the concrete requirement, although preliminary testing of the general soil types may estimate this condition. Subdrains Subdrains should be considered for all canyons receiving fill and for all stabilization construction. These would be intended to collect rising groundwater, or to relieve accumulations of water from landscape irrigation sources. Subdrains should be constructed with perforated pipe embedded in a filter material. Groundwater presently exists in the lower alluvium. GeoSoils, Inc. Daon Corporation Page 14 W.O. 109-SD August 17, 1979 We sincerely appreciate this opportunity to be of service, and we will continue to provide you with consultation and pertinent parameters as they are developed. If you have any questions regarding the information in this report or other geotechnical aspects of the project, please call. Respectfully submitted, GeoSoils, Inc., By: Geologist Reviewed By : Albert R. JAS/TCW/gn Civil Engineer Encl: Geologic Map - Plate I Structure Sections - Plate I1 & I11 Preliminary Stabilization Map - Plate la Stabilization Structure Sections - Plate IIa & IIIa Appendix - A- Boring and Trench Logs (GSI) B- Previous Boring and Trench Logs (SEA) GeoSofls, Inc. - Daon Corporation - W.O. 109-SD APPENDIX A Trench Logs - Plate TP-1 to PT-24 Logs of Borings - Plate B la to B 20 CeoSoils. Inc. I " - " i G 0 TEST PIT LOG 1 DATE 6-14-79 LOGGED BY JAS/TCW ELEVATION w.0. 109-SD CLIENT Daon i- lG 0 TEST PIT LOG 2 w. 0. CLIENT DAON PRCJECT 109-SD Carrillo Ranch IG 0 I TEST PIT LOG 3 DATE 6-14-79 LOGGED BY TCW ELEVATION w.0, 109-SD CLIENT DAoN PROJECT Carrillo Ranch G 0 TEST PIT LOG 4 \ DATE 6-15-79 LOGGED BY TCW ELEVATION 1 w.0. 109-SD CLIENT DAON G 0 TEST PIT LOG 4 DATE 6-15-79 LOGGED BY TCW ELEVATION w. 0. 109-SD CLIENT DAON PROJ~~T Carrillo Ranch DATE 6-25-79 LOGGED BY ELEVATION TCW w.0. 109-SD CLIENT DAON * G 0 TEST PIT LOG 7 DATE 6-25-79 LOGGED BY TCW ELEVATION w.0. 109-SD CLIENT DAON PRCJECT Carrillo Ranch G 0 TEST PIT LOG 8 < DATE 6-25-79 LOGGED BY TCW ELEVATION G 0 TEST PIT LOG 9 \ DATE 6-25-79 LOGGED BY TCW ELEVATION w. 0. CLIENT Daon PROJECT Carrillo Ranch 109-SD DATE LOGGED BY TCW ELEVATION " W.O. 109 - sn CLIENT DAON PROJECT Carrillo Ranch k G 0 TEST PIT LOG 11 DATE LOGGED BY TCW ELEVATION " w. 0. 109-SD CLIENT DAON PRCJECT CARRILLO RANCH ,- .- .- G 0 TEST PIT LOG 12 DATE 6-27-79 LOGGED BY- ELEVATION w. 0. 109-SD CLIENTRAON G 0 TEST PIT LOG 13 \ DATE LOGGED BY XW ELEVATION 6-28-79 - v) H ! 0 U w. 0. 109-SD CLIENT ma PROJECT Carrillo Ranch DATE 6-28-79 LOGGED BY- ELEVATION w. 0. 109-SD CLIENT- PRGJECT Carrillo Ranch * G 0 TEST PIT LOG 15 DATE 6-28-79 LOGGED BY ELEVATION Tcw Lo Fi 0 1 U DATE 6-29-79 LOGGED BY- ELEVATION I- I G 0 TEST PIT LOG 17 \ DATE 6-28-79 LOGGED BY ELEVATION !rcw t W.O. 109-SD CLIENT DAm I- .- G 0 TEST PIT LOG 18 4 DATE 6-28-79 LOGGED BY ELEVATION w.0. 109-SD CLIENT DAON PROJECT Carrillo Ranch r- I ! DATE 6-28-79 LOGGED BY TCW ELEVATION W.O. 109-SD CLIENT Daon PROJECTCarrio Ranch ,- I .. b G 0 TEST PIT LOG 20 ! - i DATE 6-28-79 LOGGED BY ELEVATION TCW w. 0. 109-.SD CLIENTAn PRGJECT Carrillo Ranch 1- I- G 0 TEST PIT LOG 21 * * DATE 6-28-79 LOGGED BY ELEVATION TCW w. 0. 109-SD CLIENT PRCJECT Carrillo Ranch DAON G 0 TEST PIT LOG 22 I DATE 6-28-79 LOGGED BY- ELEVATION 4 w. 0. 109-SD CLIENT-RAON PRCJECT Carrillo Ranch G 0 TEST PIT LOG 23 I DATE 6-28-79 LOGGED BYTCW ELEVATION W.O. 109-SD CLIENT DAON PROJECT Carrillo Ranch * G 0 TEST PIT LOG 24 DATE 6-28-79 LOGGED BY ELEVATION TCW w.0. 109-SD CLIENT DAON PROJECT Carrillo Ranch i BORING LOG 1 CLIENT DAON W.O.*SD DATE DRILLED6/13 - 14/7 9 LOGGED BYJAS/TCW PROJECT Carrill0 Ranch SURFACE ELEV. 350 DRIVING WT. TOPSOIL: SILTY CLAY, dark brown to black, moist, grades to SILTY SANDI to CLAYEY SAND, orange to buff, moist, soft. F t - mottled, burrowed, damp to - moist SILTY CLAY and topsoil - with shards of light colored material =GRABEN. steep streaked topsoil 4 E-W 50N. underneath] PUNKY BEDROCK, orange, light gray to white, - root bearing, mottled burrowed, damp to moist. CLAYEY FINE SAND, light gray to white fairly friable, local - iron cemented zones otherwise - non-discripted. - - - - - / / t CLAYSTONE, medium gray, orange disturbed, FOSSIL DEBRI, 6-8 and yellow staining, highly FOSSILIFEROUS MUDSTONE on Only - inches thick well cemented the North side of hole. - Dipping 60° S.E. other part steep shear with orange streaks - of FOSSIL. layer offset 2 ft. N60E, 35 SE on S-side. orange and yellow banding / CLAYEY SILT, light gray, moist soft. 2-3 ft. shear zone,&g;y,- $!g ~ - - - - - - - - - G 0 BORING LOG 1 4 slide zone highly sheared, well developed, polished - surfaces, moist, plastic CLAY on shear zone extending to - - CLAYEY SILTSTONE, Light gray, - material grading into FINE SAND and CLAYSTONE, hard, - greenish gray. - - - CLAYSTONE, green, damp, hard, - occasional shears. SITLSTONE and SILTY SANDSTONE - dark to medium gray, damp, hard. CLAYEY SILTSTONE, dark bluish gray, hard, iron staining damp to dry, occasional shears. - - - / - - 0 BORING LOG 2 I "0 - TOPSOIL: SILTY CLAY, dark brown - damp to moist, soft to firm. - Burrows, CLAY and CLAYEY SAND - - - to weathered CLAYSTONE. - CLAYSTONE, orange banding, moist to very moist, soft. highly fractured. above, soil type loose, below - - - surfaces with orange banding. Tension crack trending E-W 90 - infilled with SAND is cutting off FOSSIL bed. - - N75W 8-10 N. SAND and FOSSIL - ayer on N-side of hole. - - the NW joint may be different. Infilling on joint (E-W) so light, SILTY CLAY, no color - - F 0 BORING LOG 2 I c 1 CLIENT- DAON W.O.*SD ELEV. 365 DRIVING WT. PROJECT Carrill0 Ranch SURFACE D4TE DRILLED6113 - 1412 9 LOGGED BY=S/TCW J 0 (3 E ?19.5'oxidation streak trending E-WI - 35N1 present all around the - hole. A few parallel surfaces similiar to bedding. - - !21' FINE SAND layer underlain by CLAYSTONE with orange banding. - N80W, 10N. bedding in SAND layer trends - - !4'INTERMEDIATE SLIDE PLANE: moist, plastic clay, polished,soft, - N70E. 12N. Parallel surfaces - 125' 126' above in CLAYSTONE above. join trending E-W, 80N below shear zone. 1 foot weathered zone then cemented SILTSTONE. under that is light gray CLAYEY SILT. cemented layer parallel to shear surface so must be parallel to bedding. polished surfaces, well developed, parallel with bedding above. to 37.5 feet. light gray fine SAND continues ,27.5 SILTY CLAY/CLAYEY SILT 8.5 CLAYSTONE, upper surface marked bv oxidation, BEDDING is thin E with local moist zones/N55El 10-llN. BORING LOG 2 CLlENTDAnN. W.0,- DATE DRILLED 6113-14/79 LOGGED BYJAS/TCW PROJECTCarrillO Ranch SURFACE ELEV. 365 DRIVING WT. - Id :: I 430 am I u I/ CLAYSTONE to fine SANDSTONE. c 1 I /./ S-side cemented of SAND hole laver, exposes somewhat a t of layer at 32 feet, N85E,12N fractured, trend-taken on top ~ ft. series of fractures PJ40W, well developed parallel surface just below. material above SILTY CLAYSTONE, below is red- t CLAY becomming hard orange iron stained, polished surface N70W, 40S, well devel- oped with a few parallel plastic than above. surfaces below. more moist & iron staining becomming brighte and more true orange, CLAYSTONE darker gray. series of steeply dipping orang fractures in all directions. 0 BORING LOG 2 - 0 BORING LOG L ~ i CLIENT DAON W.O. mD DATE DRILLED6/13-14/79 LOGGED BY=/Tm PROJECT!~~Z~~~O &Xi& SURFACE ELEV. 310 DRIVING WT. - TOPSOIL; SILTY CLAY, dark brown, - damp to moist, soft to firm. weathered fine SANDSTONE CLAYEY, - orange brown, moist, firm. - Sandy, SILTY FINE SANDSTONE, - light orangish to white, moist - loose, CALICHE bearing. CHALK, CALICHE deposit at base - of SAND. below is crumbly CLAYSTONE contact N40W, 5-6NE. CLAYSTONE is medium to light - gray damp, stiff. GYPSUM, and illregular slick - surfaces. - harder, orange sheared surface representing beginning of intense fracturing. CLAYSTONE becoming more disturbed. - polished, striated surfaces \ - - - - - - Lineations on striae generally - plunge to the north. harder, gray CLAYSTONE series of - fractures N60E, 90, N60W, 21~ - \ =shear surface. SLIDE PLANE: N30W20N, shear zone I representinu 3 to 4 surfaces. I CLAY lined,-soft. CLAYSTONE fractured in all Shear surface, N65W, 55N directions. 0 BORING LOG I CLIENT DAON W.O.lmD DATE DRILLED 6/1 3-14/79 LOGGED BY- JAS/TCW ~~ PROJECT- SURFACE ELEV. 310 DRIVING WT. \ CLAYSTONE and SANDY CLAY/CLAYEY SAND, buff to light gray, dry to damp, hard. -CLAYSTONE, hard, slightly damp I- occasional random fractures, irregular slicks. CLAYSTONE continues, hard, random fractures, massive E ' TOPSOIL: then back into mottled - dry,san@ CLAY,loose,layers of SAND, medium dense. mixture of weathered CLAYSTONE and topsoil (weathered CLAYSTONE) moist plastic CLAY layer and SLICK SURFACE poorly defined but - plasticity is countineous around - hole. gently dipping westerly. - Interbedded CLAYS & SANDS, contac'i poorly defined between 7 and 11 - feet. just above gray brown gray CLAYSTONE with lot of SANDY CLAY and overlying light CALICHE are two parallel SLIDE PLANES 6-8 inches apart. slight1)- steeper dip than CHARCOAL,AN6OE, - - - - - - - - CHARCOAL bearing, SANDY CLAY layer. charcoal just above SANDY CLAY layer. surface undulatory CHARCOAL streaks N45E, 5NW and essentially flat 1ying.Other - attitude of possible SLIDE PLANE. - with CLYST. Above and below, 6 inch concentration of CHARCOAL - streaked and smeared zone in upper part of zone. (sampled - - - - minor local caliche, CLAY - continuing to this depth. CLAY - contains small amounts of SAND and PEBBLES, moist, stiff. grading to fine SANDY CLAY, to medium GRAIN SAND to verv COARSE - - - I ~~ SAND, 18 inches thick. a few PEBBLES caught up in SLIDE PLANE. PEBBLES k to k inches. .. BORING LOG I @2l 1' contact, SAND over CLAY, SLICK SURFACE along contact NSOE, 10-12N. CLAY is very moist, contact and slick have same trend, failure across CLAY unit, well developed surface with CLAY disturbed for 4 to 5 inches below i it. t I At 20% feet. very plastic zone 23t Materials moist, stiff to very stiff CLAY, change from ROCK below to more soil like materials above. (contact between competent BEDROCK & CRUDY ROCK & SOIL) @ 3-5 fracture pattern / N70W to N40W, 65-90N. high concentration of RED IRON staining. 2nd joint set N75E, 85NW., well developed. I @ 24' moderately well defined polished surface. slightly obscured by fracture pattern/ N55E, 35SE. polished surface steepens into the fractures on the N.W. side of hole. -5' gray CLAYSTONE, hard, damp, red streaks, irregular joints ROCK below is dense. @26'BEDDING, poorly developed A N65E, 11N.W.k N65W, 70 NE Disturbed zone just above BEDDING attitude. medium grain, SILTY SAND, dense, damp, qrayish to light brown. coniacf abrupt between SILTY SANDS and CLAYSTONE, BEDDING nearly flat lying/ N70# I 2-4N.W. I+[/ 6 inch layer of well cemented t / SANDSTONE- - “40.. CLAYSTONE contact with granule size fragment. concentration^ at representing channel cuts with GRAVEL. COARSE SAND and GRAVEL overlye CLAYSTONE. reddish brown CLAY, iron stained joint N70E, 40-50SE. Joint locally well developed to obscure a 2nd joint set N70W, 50NE. CLAYSTONE and FINE SANDSTONE interbeds, 6 inches thick. - - base. contact irregular - - - - -- very thin well developed plane slightly more moist and iron stained. A N55W, 25NE, CLAY seam or Joint? slickensided CLAYS, highly disturbed. en echelon surfaces, low angles/ N25W, 55SW. some planes higher angle, some Well developed SLIDE PLANE N55W, 35NE. orange stained, CLAYSTONE below is harder, several parallel surfaces over 4 inch distance. gray fine 0 BORING LOG 4 I CLIENT DAON W.O.lmD DATE DRILLED 6/13 - 14/7 9 LOGGED BYJAS/TCW PROJECT Carrill0 RanchsURFACE ELEV. 270 DRIVING WT. ~~ 0 BORING LOG- I I L SANDY CLAY, black (TOPSOIL) - ALLUVIUM: CLAYEY SAND, medium to -3 dark brown, very moist, very - soft. - 'CLAYEY SAND, dark brown, very -S( moist, soft. - - ' CLAYEY SAND, light brown, very -S( moist, soft. - - SAND, light brown, wet, loose SI - - -I 5 - - I SAND, medium brown, moist, loose. 'Caving at 18 feet due to 4 I groundwater. 2 sal. /hour. t flow approximately I- Total depth 18 feet Unable to penetrate deeper Groundwater at 18 feet. t C. 0 BORING LOG 6 I CLIENT DAoN W.O.wD - DATE DRILLED 6-27-79 . LOGGED BY- GD , TCW ' PROJECT Carrill0 R~~C~SURFACE ELEV. 245 DRIVING WT. 2500 TOPSOIL:,SANDY CLAY, brown to black, -C] moist, hard, porous with rootlets - and caliche. SANDY CLAY, medium brown, very moist, very stiff, with rock fragments. ,c 1 - - c1 SANDY CLAY, green moist, hard SANDY CLAYSTONE (WEATHERED BEDROCK),- - - green, moist, hard, with caliche. \ - CLAYSTONE, green, moist, hard, iron staining. - CLAYSTONE, gray - green, moist, hard, iron staining, polished - fractures & evidence of shearing. - ' CLAYSTONE, gray, moist, hard, - fractured and polished. P \ ~ SHEAR ZONE withhighly disturbed Claystone (Slide Plane?) L /Sandy CLAYSTONE, gray to green, moist, hard. t- r CLAYSTONE, gray, moist, hard. F t I 0 BORING LOG I L I . PROJECT~~~~~~~O Ranch SURFACE ELEV. 245 DRIVING WT. CLIENT DAoN -~.0.109-~~ DATE DRILLED- . LOGGED ~y2 GD TCCi 'CLAYSTONE, gray to green, water- seepage along fractures, occasional well developed striae along shear planes. L - CLAYSTONE, gray, wet, hard. TOTAL DEPTH 44 feet. / - - - - NOTE: Hole was left open overnight- with intention of down hole logging- 6-28-79. Hole was completely at ?am. 6/28. Seepage initially filled with water upon returning encountered at30 feet. - - - - - - - - - - c- . 0 BORING LOG I ~ ~ CLIENT DAON W.O. 109-SD DATE DRILLED 6-27-79 ' LOGGED BYGD,TCW PROJECT Carrillo Ranch SURFACE ELEV. 230 DRIVING WT. 250° ~~ ~~~ 2 m t v) a 0 3 [L 0 4-01 I I tj 'I TOPSOIL:,SANDY CLAY, medium brown, moist, hard, with roots and caliche --/ALLUVIUM: CLAYEY SAND, gray to green, moist, hard. SANDY CLAY, gray to green, moist, very stiff. - "5 - )CLAYEY SAND, mudstone fragments /SANDY CLAY, gray to brown, moist, - very stiff. I SAND increasing m CLAYEY SAND, medium brown, moist, tS( - dense, coarse sand & mudstone fragments, becoming harder. 14% ft., large cobbles (2-6 inch) -15 \ SAND AND ROCK - \CLAYEY FINE SAND, gray to brown, very moist. - "20 - 24 CLAYEY SAND, medium brown, moist, dense, sand coarse to fine grain. - CLqYEY SAND WITH ROCK, wet, medium dense, no recoverable sample. - Becoming very wet. "BEDROCK: CLAYSTONE, greenish gray, - fractured, iron stained. t L 0 BORING LOG I .CLIENT DAoN w. 0. __ 109-SD DATE DRILLED 6-27-79 . LOG6 D BYSTCW PROJECT Carrillo Ranch SURFACE ELEV. 230 DRIVING WT. 2506 \ CLAYSTONE, grayish green, moist, hard. SANDY CLAYSTONE, gray to medium brown, moist, hard. SANDSTONE, gray to green, moist, matrix. dense, mediumgrain, with Clayey SANDY CLAYSTONE, greenish gray, \ moist, hard. F TOTAL DEPTH 40 feet. Water seepage at 25-27 feet. No Caving. BORING LOG I I I I TOPSOIL:.SANDY CLAY, dark brown, CE dry, hard, porous with roots. ALLUVIUM: SANDY CLAY, dark brown, dry CE hard, porous with roots and caliche SANDY CLAY, medium brown,. moist, very stiff. - - - - CI 'CLAYEY SILT, gray, moist, very - stiff, minor amounts of caliche - - /SAND, medium grain, gray, moist, SP loose. - - /4-6 inch cobbles - SAND, medium to coarse, gray, moist.SP - 'BEDROCK: SANDY CLAYSTONE, green, slightly moist, hard. SANDY CLAYSTONE, light green, damp, hard. t TOTAL DEPTH 20 feet No Groundwater encounterefi No Caving 'E BORING LOG I Fa wo WJ LL -2 =I I WI- a I-P a aw a 30 w " 0 " m I > v) a 3 0 12: a SANDY CLAYSTONE, gray-green, moist, - iron stained, polished, caliche. - - CLAYSTONE, greenish gray, moist, hard, minor polished surfaces. t "5 - CLAYSTONE, light gray, damp, hard, soapy, highly sheared with smooth slick surfaces. F Slide Plane: Oxidized, undulatory NlOW, 30SW, striated surface "-10" CLAYSTONE, gray, damp, hard. N60W, 70NE, Orange oxidation on /Two main joint planes, other is surface. CLAYSTONE, gray & mottled, orange E, red, damp, hard. Zone of red oxidation,Claystone less fractured. - -45" - H I ' SANDY CLAYSTONE, gray, slightly t - damp, hard. - / CLAYSTONE, gray, damp, hard, some "20" polished surfaces. HIGHLY SHEARED CLAYSTONE, Striated, iron stained oranqe, shear N20W I ZONE. c SANDY CLAYSTONE, damp, hard red iron staining. - -25 - Red iron staining increases and - increasing in sand matrix. - -30- - > v) I- W' z D > IT D - - 10: 10f 109 L22 129 L20 0 BORING LOG I - I CLIENT DAoN W.0.109-SD DATE DRILLED 6-28-79 ' LOGGED BY2 GD TCN PROJECT Carrill0 Ranch SURFACE ELEV. 355 DRIVING WT. 2500 lbs- I I H I hard. CLAYSTONE, gray, slightly moist, t U I/ t- / HIGHLY SHEARED CLAYSTONE ZONE, - complex & undulatory striated surfaces, very moist. CLAYSTONE, gray, damp,. hard, slightly oxidized orange. CLAYSTONE, gray, some red staining, damp, hard, some polished surfaces. CLAYSTONE, medium gray, wet & hard, - joint, surface wet and striated. - - - L N55E, 60SE. - just above Claystone contact. HI r. CLAYSTONE, blue-gray , damp, very hard. (contrast hardness), less fractured. t t: 60 I I 0 BORING LOG 9 I CLIENT DAON W.O. mD DATE DRILLED 6-28-79 LOGGED BY- GD ;TCW ' PROJECT Carrill0 R~~C~URFACE ELEV. 355 DRIVING WT. SANDY CLAYSTONE, gray, red staining damp, hard. t / CLAYSTONE, blue-gray, damp, hard. t I- - /TOTAL DEPTH 13 feet. . c Water seepage at 48 feet. Basal slide plane at 54 feet. BO8ING LOG ,x- I 4 CLIENT PROJECT DAON , W.O.aSD DATE DRILLED 7-12-79 LOGGED BY- TCW SURFACE ELEV. .-. 290 DRIVING WT. l8o0 Ibs- Carrillo Ranch TOPSOIL: SILTY CLAY, dark brown, moist, very stiff.' t CLAYSTONE, light gray with some '- red. staining, dry to damp, hard, soapy, fractured. - SILTY CLAYSTONE, light gray with .red staining, damp, hard and * fractured. - .Joint Attitudes, NlOE, 90 - E-W, 40s / SILTY CLAYSTONE, medium gray and orange stained, damp, very hard. - .) /SANDY CLAYSTONE, light gray, red L stained, damp, very hard, contact . between overlying claystone and sandstone, beneath sandstone is moist, dense and coarse grain. - Bedding Attitude, N20W, 18NE - Back into Claystone - -Red stained polished fractures ' - I L Moisture increases, Claystone I very moist. Joint Attitude, N-S, 50W. CLAYEY SANDSTONE, light gray to - white with orange staining, damp, very dense. - 1 ~ - . .. / L Water seepage in Sand layer. - - CLAYEY SANDSTONE, light orange to - /yellow, damp, coarse grain. I r 0 BO8ING LOG.10, I 1 CLIENT PROJECT Carrillo Ranch SURFACE ELEV. --- DRIVING WT. l8Oo Ibs- DAON 109-SD 7-12-79 TCH W.0.- DATE D94bLED- LOGGED BY- SANDSTONE, orangish-gray, very wet, coarse grain. - 9 I CLAYSTONE, light gray and mottled 'with orange, punky I " - SANDY CLAYSTONE, lightgray, damp, very hard. to 45 feet, Water seepage highly disturbed zone, polished . 'SLIDE PLANE: CLAYSTONE, dark gray, - * surfaces, shear zone extends down -. - SANDY CLAYSTONE, light gray, to brown, damp, hard. . - I / ' SILTY CLAYSTONE, dark blue-gray, damp, hard. ' TOTAL DEPTH, 60 ft. Water seepage at 28 E, 43 ft. No Caving. t IG 0 BORING LOG 11 I I ~ ~~ TOPSOIL: SILTY TO SANDY brown,.dry to damp, dessicated. .~ / SANDY SILTSTONE, mottled orange and gray, damp to moist, very stiff. Orange banding 1 to 2 inches thick with gypsum crystals, sub- .horizontal, undulatory. Also thin yellow stained fractures trending in all directions. /Back into CLAYSTONE, sand layer above - is approximately 2 feet thick. claystone - shm joints with polished surfaces and" . orange staining. SILTY CLAYSTONE, mottled orange to - gray, damp to moist, stiff to hard,. Wavy joint paterns with orange gypsum crystals. staining & crystal growth. - Joints trending in all directions - prominent joint N25E, 50SE, surface 1s stained and polished. \Bedding Atti-tude N60 to 80E, 5NW. - - - - CLAYEY SILTSTONE, light gray, moist, very hard. Joint Attitude, N80W, 90. Joint Attitude, N85E, 82SE N75E, 50SE Zone of numerous polished joints, f CLAYSTONE, less hard, becoming L sandy. . damp, very hard. CLAYEY SANDSTONE, light gray and mottled orange, moist, dense. Becoming more sandy with a - gradational contact. ' SANDY SILTSTONE, medium gray, - - - . L BO8ING LOG 11 I L, 4 CLIENT DAON , W.O.aSD DATE DRILLED 7-12-79 390 LW&DlE2.- TCW PROJECT Carrill0 Ranch SURFACE ELEV. .-, DRIVING WT. . t ' SANDY CLAYSTONE ABOVE AND SAND- STONE BELOW, Sandstone is medium to coarse grain, gray with orange streaking. Contact is marked by 3 inch thick orange oxidation zone. .Bedding is Horizontal. Another Contact, white clean mediu to coarse grain sandsto'ne beneath ''I Clayey Sandstone. Contact marked b N50 to 65E, 5 to 10 SE. White 1/8" orange band. Bedding Attitude -Sandstone is dry, and Dense. F t L G 0 BOfiING LOG.&. I Back in CLAYSTONE, hard, highly - fractured Punky at '32 feet. Then hard again at 33 feet. . - 'SLIDE PLANE: Many polished and m striated surfaces in Claystone, - .striated surfaces dipping steeply west. Undulating surface that is highly polished with bright red and orange staining trends N60W, dipping 28SW. - - I SILTY CLAYSTONE, light to medium gray, damp, very hard. - - . - I - - /SLIDE PLANE: Soft, mottled, PUNKY CLAY, highly disturbed. approxim-. - ately 12 to 16 inches thick apparent dip 18-20 west. - - - - SILTY CLAYSTONE, dark gray, damp, - very hard, unweathered. - / No Water Seepage Basal Slide Plane at50 feet TOTAL DEPTH 60 feet IG C. 0 BORING LOG 12 I CLIENT DAON , W.O.mSD DA3E DRILLED-7-13-79 LOGGED By" TCW PROJECT Carrillo Ranch SURFACE ELEV. .- 365 DRIVING WT. 1800 lbs. I TOPSOIL: SANDY CLAY, dark brown, dry - ' CLAYEY SAND, (SC) , medium orangish . . brown, moist, very stiff to dense. to damp, hard, dessicated. I m - - - . 'CLAYEY SANDSTONE, medium gray, - mottled orange and red, damp, dense, fine grain. - . .. I I SANDY SILTSTONE, gray with orange streaks, damp, hard. - 9 - - I - - - - '1 Ft. gray Claystone layer. . .~ I- moist, hard, highly fractured. SANDY CLAYSTONE, green, damp to - 0 BORING LOG 12 I 4 CLIENT DAON . W.O.-lsD DATE DRILLED 7-13-79 LOGGED BY- TCW PROJECT- RancPSURFACE ELEV. -365 DRIVING WT. 1800 lbs. t , ______I ToPSolL: CLAYEY SAND (SC) mottled t \ white, green gray, red and orangeL wet and punky, graded to - weathered BEDROCK. CLAYEY SANDSTONE, olive gray - moist, medium dense. ! - ~ - - Water seepage - - - Water seepage - A CLAYEY SANDSTONE, light green to - gray, moist, dense, coarse grain. damp, hard. - - - - - - - - SANDSTONE, orangish brown, damp - hard, with ROCK fragments, very - hard drillinq TOTAL DEPTH= 25 Ft. - water seepage at 7 and 9 feet, - hindering drilling. Slide plane - not penetrated due to hard SXNDSTONE @ 25' - 0 BORING LOG 14 I C 1 CLIENT DAoN PROJECTQrrillO Ranch SURFACE ELEV. 295 DRIVING WT. l8O0 lbs. W.O.*SD DATE DRILLED 7/16/79 LOGGED BYZW - Topsoil, CLAY(CL), medium - reddish brown, very moist stiff. - - Weathered CLAYSTONE soft. - - "5 - SANDY CLAYSTONE, medium gray, - - damp, hard. ~ contact between highly fractured - SANDSTONE below. contact \CLAYSTONE above and CLAYEY - indistinct. - - - / SANDY CLAYSTONE, medium gray, - \Joint attitude N55E 45NW, orange & red stained, damp, hard. caliche infilled. - 7 - - \ polished CLAYSTONE and striated - - surfaces, moist, soft. "15"' Sandy CLAYSTONE, medium gray, - moist to very moist, hard, highly fractured. - - SLIDE PLANE: highly disturbed CLAYSTONE zone mottled dark gray with light gray CLAYSTONE pods and dark brown TOPSOIL. Highly sheared surfaces, GYPSUM crystals, very moist, soft. SLIDE PLANE nearly flay lying o to 3' to west. \\-slight water seep on SLIDE PLANE. CLAYEY SANDSTONE and conglomerate orangish brown, damp, hard, (Lusardi Formation). - - - ~ - Total Depth 26 feet slight water seepage at 18 feet SLIDE PLANE at 18 feet. - - 116, 86. ! LOO. 0 BORING LOG 15 I Id :: I "to m I TOPSOIL: SILTY CIAY, black, danp, stiff CLAYEY fine grain SANDSTONE, HI light gray to white with orange, damp, medium dense. t "I U I, Hq contact marked bv 2 inch thick contact with CLAYSTONE below. t - - red stain layer. attitude on developed fracture N25W 90. contact N70W 9-20NE. well - - - "-10 CLAYSTONE light gray, damp, hard,- - highly fractured with parallel - bedding. yellow stained surfaces, equal - fracture N60W, 90 - i - zone of red staining, very loose with oDen vertical ioints. & 2 &LAYSTONE, light gray above red - stained zone. 3 to 4 ft. thick appears similiar to the zone at - - - staining, gentle dip 2 to SE. - - 12 feet. flat lying. - "20- another zone of red oxide - contact with light gray CLAYSTONE above, orange SANDSTONE below. BEDDING N20W, 5S.W. contact well SANDSTONE is coarse grain. - - - -25- from 24 to 27 feet SANDSTONE is - - exposed. dense, dry to damp, fine to medium grain. - - - - "L " _.- PROJEC @29-30' SLIDE PLANE: Layers of TOPSOIL within SANDSTONE at contact with underlyinq CLAYSTONE. contact dipping west with hard layer on south side of irregular. Tension fractures, hole juxtaposed' against CLAYSTONE on north side. SAND and TOPSOIL. - filling into tension fracture. CLAYSTONE, firm, moist. - CLAYSTONE, brown with orange '& red staining, very moist, firm. - fracture, N75E 33' SE infilled with CALICHE. " - - - - - - SANDSTONE and Conglomerate, - Lusardi Formation. - - Total Depth 42 Feet. NO Water Seepage - Slide Plane at 30 feet. - b - - - c . - I: .- .- .. i 0 BORING LOG 16 TOPSOIL, - CLAY (CL), dark brown, dry stiff. - CLAYSTONE, light gray and orangist brown, very moist. moist, stiff. CLAYSTONE, orange brown; very - weathered SANDSTONE with caliche veins. ' - - - - t - \ SANDSTONE. contact marked by red contact with CLAYSTONE above - and orange staining in the SANDSTONE. contact well developed.- light gray, moist, very stiff. - oxidized zone of red and yellow - BEDDING N70W 1OSW. CLAYSTONE - CLAYEY SANDSTONE. contact, CLAYEY SANDSTONE over clean SANDSTONE. BEDDING attitude- - N30W, 5NE. STONE. SANDSTONE is stained interbedded SANDSTONE and CLAY- orange and CLAYSTONE light gray with red staining, beds are - 3 to 4" thick. moist, dense to very stiff. - - - - SLIDE PLANE: i zone of Durale, and orange CLAY c I polished- su>faces, highly disturbed, striated, toe of slide. N60E. low, zone extends I to 20 feet. - - - CLAYSTONE below is highly jointed and sheared, joints marked by orange and red stain trending in all direcitons. very moist and very stiff. CLAYSTONE less stained, and generally a little harder. GYPSUM filled veins, very moist, moderately fractured. highly sheared, light gray CLAYSTONE NlOW 48 SW. a second shear surface N55E 45NW striation 48, S80W and 45N 40W. i 0 BORING LOG 16 I L - increasing red staining in - CLAYSTONE. - \ contact, gray CLAYSTONE over - orange CLAYEY SANDSTONE. - 36 feet. interbedded gray - CLAYSTONE and orange CLAYEY - SANDSTONE. layers approximately 3 inches thick, hard to dense, \ well developed. - BEDDING N30E, 8SE. from 34 to - SLIDE PLANE: - approximately 12" to 18" thick, highly sheared, medium gray polished and striated. N55W, CLAY, high fractured, soft, 15-20NE. - \ - - - ~~~~ CLAYSTONE, dark gray, moist, hard, massive. t Total Depth 50 feet. Slide Planes at 20 and 40 feet No Water Seepage. I L 0 BORING LOG l7 4 - CLIENT DAON W.O.L!??~~ DATE DRILLED 7/16/79 LOGGED BY- TCW PROJECTCarrillo Ranch SURFACE ELEV. 530 DRIVING WT. 1800 Ibs- SANDSTONE, light yellow to white, fine grain, damp. - contact with massive SANDSTONE over CLAYEY SANDSTONE which is fractured, damp, hard, with caliche veins. BEDDING attitude ~~~~~sl~~~~ 85NE N-S ,90 N50E, 2ONW NlOE 30SE N75E 65SE Contact, SANDSTONE below t t \ hard fossil SANDSTONE laver Total Depth at 10 feet. c 0 BO8ING LOG.18 I I' a CLIENT PROJECT Carrillo R DAON w. 0. 109-SD Ob. 1 a - TOPSOIL: SILTY CL\Y, 'black, mist, stiff - CLAYSTONE, with orange stained fractures and topsoil. - P \Contact with underlying sandstone. 1.6-8" well cemented hard layer - layer, well cemented, N70E, 7NW. I orange Sandstone underlying the well cemented sandstone layer. Caliche and charcoal present - along contact. Bedding N40E, 13ONh. \ - CLAYEY-SANDSTONE, green, damp, hard, layered with orange banding. Contact with hard, well cemented . Sandstone. TOTAL DEPTH 10 Feet. - Unable to penetrate deeper - I - c i t BOeING LOG 19 I 1 CLIENT DAON W.0.- DATE DRILLED- LOGGED BY- TC W 109-SD 7-17-79 PROLECT Carrill0 ~anch SURFACE ELEV. - 493 DRIVING WT. thick, Bedding N50W, 1OSW. CLAYSTONE,;orangish gray, damp, hard, with fine sand, underlain by 1 foot thidk orange Sandstone layer, coarse grain. I Contact with SANDY CLAYSTONE, qreenish. Joint, N55W. 85NE,Joint \has red staining on surface. I SANDSTONE, light brown, dry,loose. 6 Inch thick layer of FOSSILIFEROU 12s5Contact, with SANDSTONE, white, orange'staining at contact, dry to damp, dense. @ I 14 1 SANDSTONE, white, is grading into a Sandy Claystone, light green. t CLAYEY FINE SANDSTONE, green, damp,dense. t BOfllNG LOG," I 1 CLIENT DAON . W.0.- DATE DRILLED--, 7-17-79 LOGGED BY- TCW PROJECT Carrill0 R~~C~SURFACE ELEV. .- 493 DRIVING WT. 5 U > 2 - C LL c Becoming dark gray - CLAYSTONE, dark greenish-gray, dampr hard, Bedding N70W, 5NE. - - .Red Oxide Zone Hard Layer I - - c TOTAL DEPTH 28 Fee,t . No Groundwater. I . - - - - - c - - - - - . L - - - . - BORING LOG 20 I CLIENT DAoN w. 0. ___ 109-SD DATE DRI LED 7"17-79 ' TCW PROJECT Carrillo Ranch SURFACE ELEV. 51k DRIVING WT. I TOPSOIL CLAYEY SANDSTONE, light tan to - yellowish white, damp, medium, dense. Contact, SANDY CLAYSTONE,. green- - gray, damp to moist, hard, - Bedding N40E, 12SE. Joint, N-S, 25E. Orange Staining and caliche on surface. Claysbone is higly fractured. - / SANDSTONE/CONGLOMERATE, well . - defined contact, N25W, 10N-E. SANDSTONE, orange in contact with gray SANDSTONE, below. Gray sand- - stone is fine grain, damp, dense, - clay matrix and finely laminated. Bedding in Laminations, N80E,19NW. Contact, CLAYEY SANDSTONE above, fossil shell layer below composed - of clayey Sandstone matrix. - Bedding NEOE, 25NW Fossil layer extends down to 16 feet. 1 foot layer of well cemented sand" stone. - SANDSTONE, light gray, damp, very - dense, fine grain with clay matrix, orange staining on contact above. Contact, fossil SANDSTONE LAYER, 6 in'ches thick. - CLAYSTONE, medium. gray, moist, hard- - c - \ - - - - - - Total Depth 40 feet. - I. No Ground water. L Daon Corporation W.O. 109-SD APPENDIX B Trench Logs 1 to 27 Logs of Borings 1 to 7 From References: 1) "Prepreliminary Geotechnical Investigation, Proposed 435 Acre Carrillo Ranch Project, Palomar Airport Road, San Diego County, California." By Shepardson Engineering Associates, Inc. Dated January 10, 1979. Project # 810241, Plates 2 through Plate 5. 2) "Limited Landslide Investigation, Carrillo Ranch Project, Carlsbad, California", By Shepardson Engineering Associates Inc., Dated January 26, 1979. Project # 810241, Plates 3 and 4. GeoSoils, Inc. BOTTOM OF TRENCH I- t 3 b J 6 7 a 9 IO II 12 IS T ea n SEE PIAl'E #4 €OR LEGEND I 1. 0 TREWCH 12 DM 106.5 IJ T..*rn I. \I - SEE D 97.9 I4 11.1 PIATE ,3 11. J 6 7 a 9 10 42 11 #4 .M 23.9 LEGENI): D. Natural Dry Density (kt) N= Natural Moisture Content (%) um or wum I ” .I 2 3 e J 7 6 6 10 9 I1 12 I3 18 IJ 16 I7 20 21 23 22 2e 2J 26 2? la 29 11 IO 12 11 34 16 J I? *e 3a 4J 96 e? *X e9 Io 9 1. 12 Y3 J@ J5 -5 Greenish gray to orwe, mist. mdlm stlff m stiff, silty clay 1-1 b!ar IDmatim) Greenish qray with orange, hmid to !et, dense, clayst- (El mr mmtiml *ring nimr Place Dip 25% Mimr Piane Strike SO% (Very et b Sticky1 1 V ~ ,. . . mjm slide plane dip 13%3W .. .. . Greenish qray with or- to red ir-ide, “t, stiff, highly plastic clays Y . 0 1 2 3 4 5 6 7 8 10 9 11 13 12 14 15 16 11 18 19 20 21 22 14 45 46 48 41 49 50 51 52 53 54 55 56 . Green qmy C fight bran. hmid. hard. ide vienlets alms pl-s- Charm1 gray to gray. dry to hid. hard to very stiff, very swdy mdstap BHEPARDGON ENOINEE4INO IM WRING ,ES rE 1-25-79 - 810241 I Plate No. 2 . !- i L 1' 1 1 I I 1 2 3 4 6 5 7 B 10 9 11 12 13 15 14 16 17 22 7.3 24 25 26 27 28 29 30 31 32 33 34 35 . 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 0 Buff. mist. transitiml dim dense. sandstar an- A- Gra-. mist. sttff. siltstDm Crav green. mist. stiff to dim Itiff. ndstm Brm.nish qray. mist. stiff. silty sandstm (scattered irmide Yxnzretimry veins') .. . KLS I" 1-25-79 I Dlatn ?.ln A TE Rln?Al