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Home My WebLink AboutCT 83-18; Calavera Hills Subdivision Village H; Soils Report; 1983-07-29SUPPLEMENTARY GEOTECHNICAL IWESTIGATIOW CALAVERA HILLS SU6DIVISION CARLSBAD, CALIFORNIA PREPARED FOR: Cesco Development Corporation 110 West "C" Street, Suite 1220 San Diego, California 92101 PREPARED BY: Southern California Soil i3 Testing, Inc. Post Office Box 20627 6280 Riverdale Street San Diego, California 92120 July 29, 1983 Cesco Development Corporation 110 West, "C" Street, Suite 1220 San Diego, California 92101 Attention: Mr. Scott Turpin SCS&T 14112 Report No. 1 SUBJECT: Supplementary Geotechnical Investigation. Calavera Hills Sub- division, Carlsbad, California. Gentlemen: In accordance with your request, we have performed a supplementary geotech- nical investigation for the subject site. The findings and recormienda- tions of our study are presented herewith. If you have any questions regarding this report, or if we may be of fur- ther service, please do not hesitate to contact our office. Respectfully submitted, SOUTHERN CALIFORNIA SOIL & TESTING, INC. Charles H. Christian, R.C.E. #22330 Curtis R. Burdett, C.E.G. #lo90 CHC:CRB:DBA:m cc: (6) Submitted (1) SCS&T, Escondido SOUTHERN CALIFDRNIA 501L AND TESTINO. , N 0. TABLE OF CONTENTS PAGE Introduction and Scope of Service ........................................ 1 Findings ................................................................. 2 General .............................................................. 2 Seismic Survey ....................................................... 2 Recommendations .......................................................... 4 Expansive Soils ................................................. 4 Slope Stability ................................................. 4 Field Explorations ....................................................... 5 Laboratory Testing ....................................................... 5 ATTACHMENTS Plate 1 Plot Plan Plate 2 Unified Soil Classification Chart Plate 3-26 Trench Logs Plate 27-28 Seismic Traverses Plate 29 Rippability Chart Plate 30 Direct Shear Summary Plate 31 Slope Stability Calculations Plate 32 Buttress Detail Plate 33 Select Fill Cross-Section Plate 51 Typical Canyon Subdrain Cross-Section Plate 52 Slope Stability Calculations Plate 53-54 Surficial Slope Stability Plate 55 Select Fill Area Cross-Section APPENOIX Recommended Grading Specifications and Special Provisions -.. SUPPLEMENTARY GEOTECHNICAL INVESTIGATION CALAVERA HILLS SUBDIVISION CARLSBAD, CALIFORNIA INTRODUCTION ANO SCOPE OF SERVICE This investigation was performed to provide additional geotechnical infor- mation regarding specific areas of the project and its intent was to supplement our January 6, 1983 "Report of Preliminary Geotechnical Inves- tigation for the Calavera Hills Subdivision, Areas El, E2, H, I, K and P through 22". The additional areas of concern were determined after review- ing a set of preliminary development plans prepared by Dale Naegle FAIA, dated June 1983. In addition, a seismic survey was performed on areas designated by the client. The scope of our supplementary investigation consisted of: surface recon- naissance; seismic refraction survey, subsurface explorations, obtaining representative disturbed and undisturbed samples; laboratory testing; analysis of the field and laboratory data; and preparation of this report. Specifically, the intent of this analysis was to: a) Explore the subsurface conditions to the depths influenced by the proposed construction. SOUTHERN CALIFORNIA e 0 I L AND TESTINE. I N 0. SCS8T 14112 July 29, 1983 Page 2 b ) Evaluate the rippability characteristics of metavolcanic and granitic rock underlying key areas designated by the client. cl Provide design information regarding the stability of cut and fill slopes proposed for Villages H and I. FINDINGS GENERAL The additional field explorations were concentrated in Villages H, I and the central-western section of Village X. Soils encountered in Villages H and I consisted of Santiago Formation deposits and minor terrace and older alluvium deposits. The Santiago Formation soils consist of silty sands randomly interbedded with claystones and siltstones, particularly above elevation 25Ot- feet MSL. The terrace and older alluvium deposits are minor and consist of sandy clays and clayey sands. The intent of the trenches extended in Village X was to further define the contact between the alluvium and the underlying rock in an area where deep cuts were anticipated. The contact was found to be farther south than previously thought. Therefore, blasting will be necessary to construct the proposed cut slopes. SEISNIC SURVEY In general, the additional seismic traverses confirm the findings of our previous seismic survey. Areas predominantly underlain by metavolcanic rock presented nonrippable material at shallow depths (shallowest at three feet), whereas nonrippable material in areas underlain by predominant granitic rock was encountered deeper (shallowest at 11 feet). A variable zone of marginally rippable rock usually exists between the rippable and nonrippable rock. In this survey, this zone ranged from 3t feet to at SOUTHERN CALIFORNIA 501L AND TESTING. INC SCS&T 14112 July 29, 1983 Page 3 least 2% feet in the metavolcanic rock and 5-t feet to l& feet in the granitic rock. The exception to our previous findings was ST 19 in which a deep layer at least 25 feet deep of marginally rippable material was encountered in an area underlain by metavolcanic rock. A summary of our seismic traverses is presented herein and on Plates Numbers 27 and 28. The interpretation is based on the rippability chart provided on Plate Number 29. The second letters of each seismic traverse number identify the individual village where the traverse was performed (i.e. ST is in Village T). Seismic Traverse Rock Type ST 18 Paleosol ST 19 Jmv/Kgr ST 20 Jmv/Kgr ST 21 Kgr/Jmv ST 22 Kgr/Jmv ST 23 Kgr/Jmv SR 24 Kgr/Jmv ST 25 Jmv/Kgr ST 26 Jmv/Kgr SP 27 Jmv/Kgr SP 28 Jmv/Kgr SP 29 Jmv/Kgr SP 30 Jmv/Kgr SP 31 Jmv/Kgr SP 32 Jmv/Kgr SK 33 Kgr/Jmv SP 34 Kgr/Jmv Jmv = Metavolcanic Rock Kgr = Granitic Rock Rippable o- 2’ O-13’ o- 3’ O-16’ 0- 8’ 0- 6’ O-11’ o- 4’ o- 5’ o- 4’ o- 3’ o- 4’ o- 5’ o- 3’ o- 4’ o- 5’ O-12’ Marginally Rippable 13-25’ 8-14’ 11-18' 4-25’ 5-14’ 3-25’ 4- 8’ 3- 9’ 5-11’ Nonrippable + 2’ f 3’ t16’ t14’ + 6’ t18’ +14' + 4’ + 8’ t 5’ t 9’ t 4’ t11’ +12’ SOUTHERN CALIFORNIA 901L AND TESTING. INC SCS&T 14112 July 29, 1983 Page 4 RECOWENDATIONS ',: 1) EXPANSIVE SOILS: It is anticipated that isolated areas of qxpansive soils may be encountered within three feet of finish grade in Villages H and I. It is recommended that in areas to receive structures said soils be undercut to a depth of three feet and replaced with properly compacted, nondetrimentally expansive fill soils. In areas to receive streets and paved parking, soils should be undercut to a depth of one foot. It is our opinion that the extent of the undercutting will not be large. 2) SLOPE STABILITY: Abundant and random lenses of claystones and silt- -- stones were encountered in the area of Villages H and I where cut .-- slopes with a maximum height of 45 feet are anticipated. The follow- ing table provides maximum heights for different cut slope inclina- tions. It is our opinion that these slopes will possess a factor of safety of at least 1.5 with respect to deep seated rotational failure (see Plate Number 31). Cut Slope Inclination Uaximum Allowable Height (Horizontal to Vertical) (Feet) 2:l 45 1.75: 1 35 1.5:l 25 It is further our opinion that a 1.5:1 slope with a height of 45 feet may be constructed if buttressed as described on Plate Number 32. It is our opinion that fill slopes constructed at an inclination of 2:l will possess a factor of safety of at least 1.5 with respect to deep seated failure (see Plate Numer 31) to a height of at least 70 feet. However, due to the presence of relatively weaker claystones and siltstones on the ancitipated fill soils it is recornnended that 90UTHERN CAL,FOl?N,A 501L AND TE5TING. INC. SCS&T 14112 July 29, 1983 Page 5 fill slopes higher than 70 feet be constructed with select material at the bottom section of the slope. The upper 70 feet of slope may be construc- ted with a mix of silty sand with minor claystones and siltstones (see Plate Number 33). FIELD EXPLORATIONS Twenty-six subsurface explorations were made at the locations indicated on the attached Plate Number 1 on July 11 and 18, 1983. These explorations consisted of trenches excavated utilizing a rubber-tired backhoe equipped with a 24-inch bucket. In addition, 17 seismic traverse lines were per- formed. The field work was conducted under the observation of our engi- neering geology personnel. The explorations were carefully logged when made. These logs are pre- sented on the following Plate Numbers 3 through 26. The soils are des- cribed in accordance with the Unified Soils Classification System as illustrated on the attached simplified chart on Plate 2. In addition, a verbal textural description, the wet color, the apparent moisture, and the density or consistency are given on the logs. Soil densities for granular soils are given as either very loose, loose, medium dense, dense, or very dense. The consistency of silts or clays is given as either very soft, soft, medium stiff, stiff, very stiff, or hard. Disturbed and undisturbed samples of typical and representative soils were obtained and returned to the laboratory for testing. The results of our seismic traverse lines are presented in Plates Numbers 27, 28 and 29. LABORATORY TESTING Laboratory tests were performed in accordance with the generally accepted American Society for Testing and Materials (A.S.T.M.) test methods or SDUTHERN CnL,FonNln SOIL AND TESTING. INC SCS&T 14112 July 29, 1983 Page 6 suggested procedures. A brief description of the tests performed are presented below: a) b) cl MOISTURE-DENSITY: Field moisture content and dry density were determined for representative undisturbed samples obtained. This information was an aid to classification and permitted recogni- I tion of variations in material consistency with depth. The dry unit weight is determined in pounds per cubic foot, and the field moisture content is determined as a percentage of the soil's dry weight. The results are summarized in the trench logs. CLASSIFICATION: Field classifications were verified in the laboratory by visual examination. The final soil classifications are in accordance with the Unified Soil Classification System. DIRECT SHEAR TESTS: Direct shear tests were performed to deter- mine the failure envelope based on yield shear strength. The shear box was designed to accomodate a sample having a diameter of 2.375 inches or 2.50 inches and a height of 1.0 inch. Samples were tested at different vertical loads and at saturated moisture content. The shear stress was applied at a constant rate of strain of approximately 0.05 inches per minute. The results of these tests are presented on attached Plate Number 30. SOUTHEFIN CALIFORN,A SOIL AND T E 5 T I N ci. f N c. SUBSURFACE EXPLORATION LEGEND lJ?aFIED SOIL CLASSTI-ICATION CHlRT SOIL DESCR*PTlON CROUP SMO‘ TYPICAL )I*YEs 1. COARSE CWJWED, nore than half OL narerinl is M than NO. 200 sieve sire. m CLE.Aa GRAVELS Gw wei1 Traded travels. qravel- store than hdlf Of sand mixtures, little or no coarse fraction is fines. ?arqer than NO. 4 GP Poorly qraded gravels. qrava1 sieve sire but sand nixtures. little or no smaller than 3”. fines. GRAVELS WITH FINES GM Silty qrave1s. poorly qraded iRppreciabt* dmO”“t gravel-sand-silt mixtures. Of fines, GC Clayey qravels. poorly graded qravel-ran.3. clay mixtures. SILyDs CLEAN SANDS Mars than half Of coarse fraction is sTm11er Chars x.2. 4 ste.,e size. SANDS WV! FINES C*ppreciable amount of fines) well qraded sand,gra”elly sands. little or no fines. Poorly jr+decJ sands,gra”elly smd*. little or no fines. Silty *andr. poorly graded sand and silt mixtures. Clayey sand,, poorly graded ran.3 and clay mixcures. 11. FINE CRAIIYED, nore than half of material is smalter than X0. 200 sieve size. SILTS AND Cu.YS XL lnorqantc *iIts and very eine Iand.. rock flour, sandy silt or clayey-silt-aand mixtures with slight plast- &city Liquid Limit CL *norqanic claya of low to less cflan 50 medim pldsticity,qravelly clays. sandy clays.silty Clays. lean clays. a. Omanic silts and orwnic niity clays of la, piarticity SILTS AND CLAYS K-l Inorganic silts, micacaous or diatomaceouo fine sandy or silty soils. elastic silts. Liquid Limit cn Inorganic clays of high clreater than 50 daaticitv. Cat clavr. OH irrqanic ci&= of me;lium to high plasticity. “ICm.Y ORGlVlIC SOILS PT *tat and other highly orqanic soils. % - Water level at time of excavation or as indicated US - Undisturbed, driven ring sample or tube sample CK - Undisturbed chunk sample t3G - Bulk sample SOUTHERN CALIFORNIA SOIL 6 TESTINQ, INC. .m.0 “,“.rn)OPL‘ .Tm=.T CALAVERA HILLS ..H 01.00. SI‘ICOmHII *ml*0 By CRB DATE 7-18-83 JOB NO. 14112 PlatcNo. 7 1 rRENCH NUMBER TI-54 :LEVATION DESCRIPTION 7 )ARK GRAY SILTY CLAY 'TOPSOIL) iREEN BROWN SANDY CLAY/ :LAYEY SAND UFF WITH GREEN TINT SILTY AND (SANTIAGO FORMATION) c . ’ RENCH ENDED AT 9' VlOIST IOIST IOIST STIFF IEDIUM IENSE IENSE SOUTHERN CALIFORNIA SOIL & TESTING,INC. - SUBSURFACE EXPLORATION LOG LOGGED BY: CR6 DATE LOGGECX7-, , -83 JOE MUYEER: _ __ .- : E ; TRENCH NUMBER TI-55 :; ,;* ; z : = ,z zrt - a9 Y - z Y~Y) - z- 5+ g ; -- E a. !Y gx ELEVATION := 0 & z : UJ ;g ,’ ;;tt ;; I- 2 oq= -0 In w 2 ’ -I ; : :, 5; 5 ql OE o 2 2 i ” DESCRIPTION 0 ‘t-i < 0 CLbH DARK GRAY SILTY CLAY MOIST STIFF 1 3 SCbL GREEN BROWN SANDY CLAY/ MOIST MEDIUM CLAYEY SAND 4 BUFF WITH GREEN TINT SILTY MOIST SANEI (SANTIAGO FORMATION) DENSE 5 6 7 CL GREEN BROWN SILTY CLAY MOIST HARD B 3 TRENCH ENDED AT 10' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG LOGGED EV: DATE LOGGED: SOIL & TESTING,INC. CRR - - JOE NUMBER: ,41 12 Plate No. 4 _. r E ii i! ; TRENCH NUMBERTI-56 5: ,:* z rzk - z w- 2 7 = = ,z i?+ YO ,r r - - ul~u) ‘=- = 0 !Y g; ELEVATION := uz I- z 4200” g; c 2 * y :: 2 : VI %z$ -P ,’ 4 a “,” o m -+ o z 5: s 0 ci”, ” DESCRIPTION 0 =0 u 0 CL&H DARK GRAY SILTY CLAY MOIST (TOPSOIL) STIFF l- 2- 3-e SC YELLOW BROWN CLAYEY SAND MOIST MEDIUM DENSE 4- SM BUFF TO LIGHT BROWN SILTY MOIST SAN0 (SANTIAGO FORMATION) DENSE 5- 6s CK 7- 8- 9 TRENCH ENDED AT 9' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTINC,INC. LOGGED BY: CRB DATE LOGGED:7-,,-83 JOB NUMBER: ,4, ,2 Plate No. 5 z 2 2 c TRENCH NUMBER TI-57 * > :“, c 0 E z 7 = ,u’ *rC w- d z: iii 2 5 = -- g:; z- :* ; : ELEVATION Y ou QJ Y E Q &f WY) 8; 2,-o 0 : ;; : 4 s 2za 6; : ‘, Z” 0 z t 0 LT ; d OESCRIPTION 0 0 c CL DARK GRAY & DARK BROWN SILTY MOIST STIFF l- CLAY i?- 3- GM RED BROWN SILTY SANDY GRAVEL MOIST (TERRACE DEPOSITS) DENSE TO VERY DENSE 1- 5- ML LIGHT GRAY SANDY SILT MOIST (SANTIAGO FORMATION) HARD CK 5 7 TRENCH ENDED AT 7' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,lNC. LOGGED BY: CRB DATE LOGGED:7-, _ JOE NULIBER: ,4,,2 Plato Nn. 6 0” -Y $ TRENCH NUMBER TI-58 +:= z z -z ; = = ,u’ :: ;= :zi;; v, Y- ;o- -- E Y 0% ELEVATION e.‘; : 2;: z- 5; ;L 0. “:: : 2 EC: 2 1: ;; -P zw :p’ z z 0; z 0 := 0 0 OESCRIPTION ‘$ o 0 E CLQ DARK GRAY SILTY CLAY MOIST (TOPSOIL) STIFF l- 2- 3- 4- CL GREEN BROWN SILTY CLAY MOIST HARD (SANTIAGO FORMATION) 5- j- - BAG I- I I TRENCH ENDED AT 12' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTINC,INC. LOGGED BY: CRB DATE LOGGED: 7-13-83 JOB NUYBCR: ,4,,2 Plate No. 7 2 z : ; TRENCH NUMBERTI-59 ; z k=; z z ; :E;; w - !JJ 0 7 c Ls 2 := 5; 5 ; = w -;‘- LE L 2 z- $5 ELEVATION c 0 E7.3 z A 2” 2,: Lw z: 0;: PO -P Y <I %zu 0; “,I 4 “,” 0 z s 0 0 i.5 ; 0 DESCRIPTION z 0 CL&, DARK GRAY SILTY CLAY MOIST STIFF l- 2- 3 CL GREEN BROWN SILTY CLAY WITH MOIST VERY CALICHE & SILKENSIDES 4- STIFF (SANTIAGO FORMATION) 5- SM& INTERBEDED LIGHT GRii MOIST DENSE ML LIGHT GREEN BROWN SILTY SAND & SANOY SILT 6.- CK 7- BAG 8- 9- 0 TRENCH ENDED AT 10' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATlON LOG LOGGED BY: DATE LOGGED: SOIL & TESTINC,INC. CR6 7-IT-83 JOB NUMBER: ,4,, 2 Plate No. 8 :, a 2 r TRENCH NUMBERTI-60 ; ; gg; z ap ; -T w - = = ,z :: YEi z ; ; z- 5.c 2 v)- SC ELEVATION p;eul y- I- 2 2 ‘ E ;g “, * 0 0 CJ _p “F < 2 z ; < <I 5 d ; *p z s; In 3 ” 0 IE c DESCRIPTION ‘ 0 CL DARK BROWN SILTY CLAY MOIST (TOPSOIL) STIFF l- 2- 3 SC YELLOW BROWN CLAYEY SAND MOIST MEDIUM 4- DENSE SM BUFF SILTY SAND (SANTIAGO MOIST DENSE FORMATION) 5- 6- CK 7- 8s 9 _ TRENCH ENDED AT 9' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG LOGGED BY: DATE LOGGED: SOIL & TESTING,INC. CRB 7-l;= JOB NUMBER: ,4,,2 Plate No. 9 . . : ; F TRENCH NUMBER TI-61 : z -7 -= 4 :" %: A= ZL- v, w- 2 +u- Y!JJv) II: c z z- 5+ 2 ! : Y OY ELEVATION rJJ Y ; 1 0 zk “z 2” ;tl <. Y n : : :: :,a %rcc kzi 6; J I $ 10 E ; 0 OESCRlPTlON Z” 0 0 , 0 CL DARK BROWN SILTY CLAY MOIST STIFF (TOPSOIL) l- 2 SM BUFF SILTY SAND MOIST (SANTIAGO FORMATION) DENSE 3- 1 BAG 5 j- TRENCH ENDED AT 7' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG DATE LOGGED: SOIL & TESTINC,INC. LOGGED BY: CRB - - JOB NUMBER: 14112 Plate No. 10 E z p” - TRENCH NUMBER -1-I-62 I- Y ,G> z ii ; 7 z : := ZZ!z w- u, y 0 20 3 YYY) Z 0 + 2 z- :+ ? ; ELEVATION !Y 2; 2; 4Y)oy c 2 : 2; *Lu 5: 0; In $e “,” -a w 6 g := 0 q z x 0 z 0 : 0 DESCRIPTION u ,” 0-r CH DARK GRAY SILTY CLAY MOIST STIFF (TOPSOIL) l- 2- 3- 4- CL GREEN BROWN SILTY CLAY MOIST VERY (SANTIAGO FORMATION) STIFF 5- HART 5- 7- 3- 3- 1 I > TRENCH ENDED AT 12' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,lNC. LOGGED BY: CRB DATE LOGGED: 7-, ,,-83 JOB NUMBER: , 4,, 2 Plate No. 11 . . 5 z ,” c TRENCH NUMBERTI-63 t- Y ‘> I- u ZZE : z Y- i 7 z z 4 z= 3 :;; G -‘L! z- 5; $5 = amy) It: Ok ELEVATION z; :;;a g; _p $w 5: t: = 6 : 0 : : :: :zK ; d DESCRIPTION Z” 0 s 0 G; ” =a c: 0 CH DARK GRAY SILTY CLAY MOIST STIFF (TOPSOIL) l- 2- 3- 4 CL GREEN BROWN & YELLOW SILT MOIST STIFF 5- (SANTIAGO FORMATION) 6 ML LIGHT GRAY SANDY SILT MOIST VERY (SANTIAGO FORMATION) STIFF 7- -- HARD 8- 9 TRENCH ENDED AT 9' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED BY: CRB DATE LOGGED: 7-, ,-83 JOB NUMBER: ,4,,2 Plate No. 12 5, a9 E ; TRENCH NUMBER TI-64 6 Y ,:* z .z ; 7 : 4 z= ZZC Y - z 3 TJ E to- - Y 2 u- ;:gJ z- 3 + $9 ELEVATION 2: z ;G ; i <uIz ;; ZY 2 ;g “,” -0 3: s 6: ,“’ : ‘, 3 -$g o z x 0 u OESCRIPTION 0 z 0 CL DARK BROWN SILTY CLAY (TOPSOIL) MOIST STIFF I- 2- 3 sCtL GREEN BROWN SANDY CLAY/ MOIST CLAYEY SAND MEDIUM 4 DENSE SM BUFF WITH GREEN TINT SILTY MOIST DENSE SAND (SANTIAGO FORMATION) 5- CK 6- 7- 8- 3 TRENCH ENDED AT 9' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED BY: CRB DATE LOGGED: - _ JOB NUMBER: 14112 Plate No. 13 :, ,Y TRENCH NUMBER TH-65 :> z 0” z z ; 7 I z * z: Y- iu ,” 05 ELEVATION 2= ;zc Y~co u, y 0 I- az + 2 z- 2: ? ;: : k “z c?z 2”” k u) 0 :: t,qY $2 -P G: 4s 0 1: z 02 o z ij ; g; ” DESCRIPTION 0 ‘s z 0 CL DARK BROWN SILTY SAND MOIST STIFF (TOPSOIL) l- 2- 3 SC YELLOW BROWN & GREEN BROWN MOIST MEDIUM CLAYEY SAND 4-. SM BUFF TO LIGHT YELLOW BROWN MOIST DENSE SILTY SAND 5- (SANTIAGO FORMATION) CK 6, 7- 3, TRENCH ENDED AT 8' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED 81: CRB DATE LOGGED: 7-,,,-83 JOB NUMBER: ,4,,2 Plate No. 14 :, z ,” F TRENCH NUMBER m-66 :: ggc = ’ > 2 ii -Y w- = = ,z y 0 $2 UAW;; ;i t- 5+ ? - - XL2 ; Y 2; ELEVATION I- 2 E $; 2 j; : i; u)w !? 3: Y 2 2 4s :z!x 5 $ 0 := go a z 2 = 0 : DESCRIPTION 0 0 ,” CLiH DARY GRAY SILTY CLAY MOIST (TOPSOIL) STIFF l- 2- SC GRtEN BROWN CLAYEY SAND MOIST MEDIUM 3- DENSE 4- SM BUFF SILTY SAND MOIST (SANTIAGO FORMATION) DENSE 5- 6 BAG 7 a- 9- 0 TRENCH ENDED AT 10' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,lNC. LOGGED BY: CRB DATE LOGGED: ,-, T-a3 JOB NUMBER: ,4,,2 Plate No. 15 z z : ; TRENCH NUMBER TH-67 ; z bQ : a9 ; : z;; Y- - = ,z Gi :c z =z "ii2 z- 5; ;L - - ELEVATION E Y $; gg :;;a ;; -P LJw 3: : ii z 4 L 255 0; z 22 o 2 s 0 0 ; 0 0 DESCRIPTION u 0 cqH DARK GRAY SILTY CLAY MOIST STIFF (TOPSOIL) l- 2- 3 SC YELLOW BROWN CLAYEY SAND MOIST MEDIUM OENSE 4 SM BUFF SILTY SAND MOIST DENSE (SANTIAGO FORMATION) ," 5, CK ).' j- 7- 3, 3 TRENCH ENDED AT 9' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG LOGGED 81: SOIL & TESTING,INC. CRB DATE LOGGED: 7- ,_ JOE NUMBER: ,4,,2 Plate No. 16 ,. z dp ,” -z ; TRENCH NUMBERTH-68 ; z z * ; 2 := w 0 iu z - c : Y OY ELEVATION 2: P k “: sg : ;: ? 4z :; = a ” u 0 OESCRIPTION CLCH DARK GRAY SILTY CLAY MOIST STIFF (TOPSOIL) l- 2- 3 SCtL YELLOW BROWN SANDY CLAY/ MOIST MEDIUM CLAYEY SAND (WEATHERED OLDER DENSE 4- ALLUVIUM) 5 SC YELLOW BROWN CLAYEY SAND MOIST MEDIUM BAG (OLDER ALLUVIUM) DENSE 5 7 MLhL GRAY CLAYEY SANDY SILT MOIST (SANTIAGO FORMATION) VERY STIFF 3- -- HARD I- )- TRENCH ENDED AT 10' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED BY: CRB OATE LOGGED:,-,, -a JOB NUMBER: 14112 Plate No. 17 z z : c TRENCH NUMBERTI-69 = w c 0 l > z i-c z 7 zzk w - L = Au’ ;5 si ;p ::g z- 55 ; :or ELEVATION I- -c:, I? y ;I: “Gj- Lz,P ;z Lw 2 EEs -P : $=u 5; li” 0 : go 0 z ‘2 I 2 0 =0 0 DESCRIPTION ” SM BROWN SILTY SAND (TOPSOIL) MOIST LOOSE TO l- MEDIUM DENSE 2- SChL BROWN CLAYEY SAND/SANDY CLAY MOIST MEDIUM DENSE 3 CL GREENISH BROWN SILTY CLAY MOIST STIFF 4 CL& INTERBEDED GREEN BROWN SILTY MOIST HARD/ 5- ML CLAY & SANDY SILT DENSE (SANTIAGO FORMATION) _ CK 5 SM& INTERBEDED LIGHT GREEN BROWN MOIST DENSE/ 7- MLbL SILTY SAND & SANDY CLAYEY SILT HARD 3- CK 121.9 14.7 3 1 I , TRENCH ENDED AT 12' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED BY: DATE LOGGED: CRB - - JOB NUMBER: 14112 Plate No. 18 : z 2 ; TRENCH NUMBER n-70 = y 6:: z ap ; 7 = ,z z 2 Y - y 0 z u: ww;; v, - - - = + ,;z z- 5+ ZF: ELEVATION z Y 2: ;; i- 2 zg 2;;: “? 2,” p : _p z %=u 6 ;; : :, * z so L3 z I:, d DESCRIPTION 0 z 0 CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2- 3- 4- CL GREEN BROWN SILTY CLAY MOIST STIFF 5 CL GREEN BROWN SILTY CLAY WITH MOIST HARD SLICKENSIDES 6-- (SANTIAGO FORMATION) 7- SM& INTERBEDED LZGREEN BROWN MOIST DENSE/ ML SILTY SAND & SANDY SILT MOIST HARD B CL& INTERBEDED GREEN BROWN SILTY MOIST HARD ML CLAY & SANDY SILT 3- 3 SM& INTERBEDED LIGHT GREEN BROWN MOIST DENSE/ ML SILTY SAND & SANDY SILT I HARD , -/ TRENCH ENDED AT 12' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL A TESTING,INC. LOGGED BY: CRB DATE LOGGED: - - JOB NUMBER: 14112 Plate No. 19 r r z ap : -: c TRENCH NUMBERTI-71 + :* = ,z z: ii? rzt z z :;; u, w- 2 5; to- = y _- == I- ; 2 g” ELEVATION LGy I- 0 a z ‘,” : ‘, z 0,: ,‘;;o o :: 2zcz 5 g 5,’ 2 = 0 := 0 0 DESCRIPTION go 0 0 0 0 CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2- 3 SM BUFF TO LIGHT YELLOW BROWN MOIST MEDIUM SILTY SAND DENSE 4- (SANTIAGO FORMATION) DENT 5 MLbL GREEN BROWN SILTY CLAY/ MOIST HARD CLAYEY SILT 6s SM& INTERBEDED LIGHT GREEN BROWN MOIST ML SILTY SAND & SANDY SILT DENSE/ HARD 7 CL GREEN BROWN & RED BROWN MOIST HARD SILTY SAND a- 3- SM& INTERBEDED LIGHT GREEN BROWN MOIST DENSE TO SILTY SAND & SANDY SILT HARD 3 I TRENCH ENDED AT 11' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED BY: CRB DATE LOGGED: - -. JOB NUMBER: 14712 Plate No. 70 TRENCH NUMBER TI-72 ELEVATION DESCRIPTION SM lROWN SILTY SAND (TOPSOIL) MOIST MEDIUM DENSE mWN SILTY CLAY MOIST STIFF 'ELLOW GREEN SILTY CLAY WEATHERED TERRACE DEPOSITS) YOIST ;TIFF jM& y1L I NTERBEDED LIGHT GREEN BROWN BUFF WITH GREEN TINT SANDY ILT & SILTY SAND SANTIAGO FORMATION) IOIST )ENSE/ iARD RENCH ENDED AT 11' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG DATE LOGGED: SOIL & TESTING,INC. LOGGED BY: CRB - _ JOB HUMBER: ,4,,2 Pl&Nn. 21 ; 2 : ; TRENCH NUMBER n-73 gg+ = * a- :g 2 z -7 w- = ,: y 0 ii: law;; ti @z = cr. & z z- 3 + 2 - - c If: 2: ELEVATION i ;; k 2 lz; 0’ ;; ii !?p ;I: 2 _o “,ZK : := ti; : f, 4 I Z” z 0’ 0 =0 DESCRIPTION s 0 0 CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2- 3- SCbL GREEN BROWN SANDY CLAY/ MOIST MEDIUM 4-- CLAYEY SAND DENSE/ HARD 5- 9% INTERBEDED LIGHT GREEN BROWN MOIST DENSE/ & BUFF WITH GREEN TINT SILTY HARD SAND & SANDY SILT 5- (SANTIAGO FORMATION) CK 7- 3- a- )- I TRENCH ENDED AT 11' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,INC. LOGGED BY: CRB DATE LOGGED: - - JOB NUMBER: , 4,, 2 Plate k2.2 -- z 5 : - TRENCH NUMBER w-74 I- y A= c z ; 7 = A” : t= z=- w - w c z wwvl j; - a:= c? ; 2 z- ?i+ I: r: -- ELEVATION i P 5 $; 22 ;; * 2 2 c 2,-o” -P “P = 2 2: 6 22 “,za :’ : f, so 0 z s5 ci DESCRIPTION 0 0 - : CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2 SC YELLOW BROWN CLAYEY SAND MOIST MEDIUM 3 DENSE SM& INTERBEDED BUFF WITH GREEN MOIST DENSE/ ML TINT SILTY SAND & SANDY SILT 4- (SANTIAGO FORMATION) HARD 5- CK 6- 7- !?- a- )- I , -f TRENCH ENDED AT 12' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTING,lNC. LOGGED BY: CRB DATE LOGGED:7-,8-83 JOB HUMBER: 14112 Plate Nn 73 ~- z 2 k! ; TRENCH NUMBER w-75 c Y ,;> z z ; 7 = ,z t= *zt w - w 0 z v, - a? z:g :: z - - L- ; ELEVATION F Y 2; I?; ‘” a. 2-0” z: muI 5; : CJ? _p %=K 6 g : :, (: z ES 5 “,” 0 z s 0 0 DESCRIPTION 0 D : CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2- 3 CL GREEN BROWN SILTY CLAY MOIST STIFF 4 ML& INTERBEDED LIGHT GREEN BROWN MOIST HARD CL SILTY CLAY & SANDY SILT 5- (SANTIAGO FORMATION) 6- CK 118.8 1.56 7- 8- 9- 1 I > TRENCH ENDED AT 12' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG LOGGED BY: DATE LOGGED: SOIL & TESTING,INC. CR6 - - JOB NUMBER: 14112 Plate No. .- 24 z z p” ; TRENCH NUMBER ~-76 = E ;> z z I :zt w - 7 w 0 = ,z 2= u, z ES”= L- Ei+ z c ; - - ELEVATION ;; z !Y 2: SW 5; = 0 $g ; v, 0 -P * ti;= := * 4s ifs q o z z 0 0 2 0’ 0 z DESCRIPTION 0 CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2- SC YELLOW BROWN & GREEN BROWN MOIST 3- MEDIUM CLAYEY SAND DENSE 4- SM& lNTERBEDED BUFF WITH GREEN MOIST DENSE ML TINT SILTY SAND & SANDY SILT (SANTIAGO FORMATION) 5, CK i CL& GREEN BROWN SILTY CLAY & MOIST HARD ML SANDY SILT I- CK 3- 9 SM& LIGHT GREEN BROWN SILTY MOIST DENSE ML SAND & SANDY SILT I- I TRENCH ENDED AT 11' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG LOGGED BY: ,,ATE LOGGED: SOIL & TESTING,IWC. CRB - - JOB NUMBER: , 4,, 2 Plate Nn 25- r ," 2 a9 7 c TRENCH NUMBER TX-77 2- > z z ; 2 z 4 :2 ;: t ;i w - iu Y 0% ELEVATION z= i- : :;g =- 5; ;p ;; I? lJJ 2: a ti ;g 2 ;; 0 -P : ;: “Z’ 4 I 22, z G & 2 go 0 ‘,” rig = 0 0 0 DESCRIPTION ” GM BROWN SANDY GRAVEL (TOPSOIL) HUMID/ MEDIUM 1 MOIST DENSE GM GRAY BROWN SANDY GRAVEL HUMID (METAV~LCANIC ROCK) VERY 2- DENSE 4 REFUSAL AT 2.5' TX-78 0 CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF l- 2 GM GRAY BROWN SANDY GRAVEL HUMID VERY (METAVOLCANIC ROCK) DENSE 3 REFUSAL AT 3' 3-r TRENCH NUMBER X-79 CL BROWN SILTY CLAY (TOPSOIL) MOIST STIFF I- > GM GRAY BROWN SANDY GRAVEL HUMID VERY (METAVOLCANIC ROCK) DENSE j REFUSAL AT 3' SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG SOIL & TESTlNG,lNC. LOGGED BY: CRB DATE LOGGED: 7-, _ JOB NUMBER: 141,2 Plate No. 26 NO RIPPING SO RIPPABILITY INDEX 15 t: .20 z ti n 25 I i I I NOTE: ! + Y -2 I I 1 -I- ST-21 ;T- FT MEC m 3000 )IUM HARD BLASTING 4ch 5ObO S&O 7&D S&O 9&D 10&J VELOCITY, FTJSEC. RESULTS TRAVERSE NO. ;T-2; m . . .,. : : I,.: T-2: ;R-24 FF ::.I',; ,': 1:. ;T-25 s . * /- , / /’ / I 4 / /’ / I / I 2’ - a 3 . . . . ;.,:!j I I I / I /’ / C / , / I /’ / / I I I i 7s 1 1’ / / / / / / / / ,’ / / L v . . :;:q I I I I I THE ABOVE RESULTS ATTEMPT TO SHOW DEPTHS TO HORIZONS OF VARYING DENSITY IN DIFFERENT LOCATIONS OVER THE STUW AREA. SEISMIC TRAVERSE NUMBERS WFER TO LOCATIONS PLDTED ON AlTACHED F’LANS. TCE’RlFl=ABILlTY INDEX-IS A MODIFICATION OF CHARTS BY THE CATERPILLAR CO. AND ARTICLE IN ‘ROADS AND STREETS; YPT., 1967. SOUIHE~Nm~~~NIA&rESTINB . . 6280 RIVERDALE SlREl3 SAM Dl~i~cMl~’ 92120 SEISMIC RESULTS CALAVERA HILLS BY DBA ONE 7-29-83 JOB Pm. 14112 Plate No. 27 c RIPPABILITY INDEX VELOCITY, FT./ SEC. RESULTS TRAVERSE NO. I I I I 1. v . . . . :;I ;.:. I I I I I I 7 I I I I I I I + I I I I -L NOTE: THE ABOVE RESULTS ATTEMPT TO SHOW DEPTHS TO HORIZONS OF VARYING DENSITY INDIFFERENT LOCPTIONS OVER THE STUWAREA. SEISMIC TRAVERSE NUMBERS REFER TO LOCATIONS PLATED ON ATTACHED PLANS. TI-E’RIPPA~LITY INDEX’IS A MODIFICATION OF CHARTS BY THE CATERRLLAR CO. AND ARTICLE IN ‘ROADS AND STREETS; YPT., 1987. z I i I I I I I t I I I i =P / I I I I I I I -L 7 I I I I I + I I I I -I + I i I I L I I I I I F I I I I I I I I_ I i i le I I I I I I I I I I 1. 7 I I I I L I I I I 1. + I I I I I SEISMIC RESULTS CALAVERA HILLS n DBA M- 7-)9-83 Jell NO. 14112 I Plate No. 28 ,- RIPPABILITY CHART We are including a rippability chart which applies to the site conditions. The chart is a modification of charts by the Caterpillar Company and an article in "Road and Streets", September, 1967, which we feel approxi- mately defines rippability with the D-9 using a conventional #9 Single Shank Kipper. D9 Cat - 19 Single Shank Rippr (Conventional) Rippable 0 - 4,500 fps Marginally Rippable 4,500 - 5,500 fps Nonrippable 5,500 + fps For trenching, materials with velocities less than 3800 fps are generally rippable, depending on the degree of fracturing and the presence or ab- sence of boulders. Velocities ranging from 3800 fps and 4300 fps gener- ally indicate marginal ripping, and velocities greater than 4300 fps are generally indicative of nonrippable conditions. SOUTHERN CALIFORNIA CALAVERA HILLS SOIL & TESTING,INC. BY: CR8 DATE: 8-2-83 JOB NUMBER: 14177 Plate No 79 _ - .._. -. .~_.. .- .~.~--._--. .-~_ .-~- ~.- ---. _~_~_~_..._ ..~ _ -~-. , ..- ._.~_ _ _ _ - .~ _. .-~. ..--.. .~~.~~_ _~_~~___ _-- -._-_-- 2M C‘IRECT ShEAR SUMMARY _- .~. -~. _-.__~-~. _ ._.~_~_~. _. _. .~._~. %eG _ _~-_ _- NORMAL STRESS, KSF r69 at 8' r75 at 6' ANGLE OF INTERNAL COHESION INTERCEPT SAnPLE DESCRIPTION FRICTION (") (psf) T69 at 8' Remolded to natural 30 200 T75 at 6' Remolded to natural 13 800 SOUTHERN CALIFORNIA CALAVERA HILLS SolI. & TESTING, INC. 8”: OBA DATES 8-2-83 JOB NUMBER 14112 Plate No. 30 SLOPE STABILITY CALCULATIONS Janbu's Simplified Slope Stability Method kc@:- , FSzN+&-) Assume strength parameters throughout the slope 0 ('1 c (psf) w, (pcf) I~ncl . H (ft) FS 30 350 117 2:l 88 1.66 Fill slope* 3. 350 117 1.5:1 45 1.62 13 800 140 2:l 45 1.52 Cut slope 13 800 140 1.75:1 35 1.63 13 800 140 1.5:l 25 2.0 Fill Slope** 25 400 120 2:l 70 1.5 Where: jj = Angle of Internal Friction c = Cohesion (psf) W, = Unit weight of Soil (Pcf) H = Height of Slope (ft) FS = Factor of Safety * Shear strength values from previous report ** Assumed shear strength values for on site non-select mix SOUTHERN CALIFORNIA CALAVFRA Hll I5 SOIL & TESTING, INC. BY: OBA DATE' T-29-83 JOE NUMBER 14112 Plate No 31 ,- ,- F~RMATI~NAL s01’li PERFORATED PtPE SELECT FlLi AREA (NATIVE SILTY SANDS W~I.Tti MINOR CLAYSTONES & SILTSTONES) BUTTRESS DETA , SCALE: k20 SOUTHERN CALIFORNIA CALAVERA HILLS SOIL & TESTING,INC. BY: DBA DADS: 8-3-83 JOB NVXBER: 14112 Plate No. 32 NONSELECT FILL TOPSOlL,CLAYSTONES + SILTSTONES MAY SE PLACED IN THIS ARE4 SILTY SAND WITH MINOR I --- -- -- SELEC,T SILTY SAND :~OPSOIL TO SE REMOVED NATURAL FORMATIONAL SOILS’ f’ SOUTHERN CALIFORNIA Calavera Hills Subdivision, Carlsbad SOIL & TESTING, INC. By: SMS DATE: 7-29-83 JOB NUMBER: 141i2 Plate No. 33