The URL can be used to link to this page

Home My WebLink About; Lake Calavera Golf Course; Geotechnical Report; 1991-02-01- - - - SECOND ADDENDUM TO GEOTECHTVICAL REPORT LAKE CALAVERA GOLF COURSE CARLSBAD, CALIFORNIA - - - PREPARED FOR: - - City of Carlsbad Municipal Projects 2075 Las Palmas Drive Carlsbad, California 92008 - - PREPARED BY: - - - Southern California Soil and Testing, Inc. 6280 Riverdale Street San Diego, California 92120 Post Office Box 600627, Zip Code 92160 - SOUTHERN CALIFORNIA SOIL AND TESTING, INC. February 1, 1991 City of Carlsbad Municipal Projects 2075 Las PaImas Drive Carlsbad, California 92008 SCS&T 8921130 Report No. 5 ATTENTION: Dan Clark, Project Manager SUBJECT: Second Addendum to Geotechnical Report, Lake Calavera Golf Course, Carlsbad, California. REFERENCE: First “Addendum to Geotechnical Report,” Report No. 4, dated December 2 1, 1990. Gentlemen: This second addendum to our geotechnical report is to further address the stability of the marsh areas where they will be crossed by the sewer main and golf cart paths. We presented a preliminary assessment of this condition in the referenced report, which was prepared prior to completing our laboratory testing. This testing is now complete. As stated in the referenced report, several test borings were extended through the alluvial deposits near areas where the sewer main and golf cart paths will cross areas underlain by alluvium. In addition, two borings were extended in the area of the proposed club house and two shallow borings were made in the proposed cut area above No. 1 fairway. The locations of these borings are shown on the plan included in the pocket of this report. The borings were logged by a member of our geology staff and these logs are presented on Plates Number 3 through 8, attached hereto. 6280 RIVERDALE STREET l SAN DIEGO, CA 92120 l 619-280-4321, FAX 619-280-4717 l p.0. BOX 600627, SAN DIEGO, CA 92160 678 ENTERPRISE STREET l ESCONDIDO, CA 92029 l 619-746-4544, FAX 619-746-6579 - - SCS&T 892 1130 February 1, 1991 Page 2 The laboratory tests performed for our evaluation of the stability of the marsh areas that may be crossed included consolidation tests and in-situ density tests. The results of our consolidation tests are presented on Plates Number 10 through 13 attached hereto. The in-situ density test results are shown on the boring logs. In addition, in-situ density, direct shear and expansion index tests were performed on samples obtained in the area of the club house. This information was used in formulating our findings in the referenced report in regards to the club house. The results of these tests are presented on the plates attached hereto. The results of the consolidation tests basically confirmed our evaluation of the marsh-like areas as discussed in the referenced report. However, the consolidation tests also indicated that the alluvial deposits are not quite as compressible as we anticipated, meaning that the magnitude of compression or settlement will be somewhat less than we expected. The site preparation discussed in the referenced report will, however, still be necessary. To reiterate our discussion, some of the alluvial deposits in the main stream bed contain excessive organics that make them unsuitable to support fill or to be used as fill material. This material will need to be removed and placed in nonstructural areas. The underlying alluvium can be bridged over with compacted till. It will probably take a two-foot-thick layer of dry sandy soil to bridge the alluvium. At this time, we do not anticipate that a rock or Geofabric stabilization blanket will be necessary. It will, however, be necessary to allow the fill to settle prior to constructing settlement-sensitive improvements such as utilities and pavements. The finger canyons that enter the main stream channel were also found to have relatively low consolidation characteristics, as we suspected. Again, we anticipate cleaning out organic-contaminated soils and bridging over the alluvial deposits. In conclusion, we do not anticipate any unusual construction or site preparation problems for the proposed crossing. The most important item for these crossings is to allow the underlying alluvium to consolidate prior to installing underground utilities. This should take no longer than one month for the finger canyons and three months for the main stream bed. If you have any questions after reviewing this report, please do not hesitate to contact this office. SCS&T 892 1130 February 1, 1991 This opportunity to be of professional service is sincerely appreciated. Respectfully submitted, SOUTHERN CALIFORNIA SOIL AND TESTING, INC. Charles H. Christian, R.G.E. #00215 Page 3 - - CHC:mw cc: (6) Submitted SUBSURFACE EXPLORATION LEGEND 1 I UNIFIED SOIL CLASSIFICATlON CHART SOIL DESCRIPTION GROUP SYMBOL TYPICAL NAMES I. COARSE GRAINEO, more than half of material is larger than No. 200 sieve size. GRAVELS CLEAN GRAVELS GW Well graded gravels, gravel- -an half of sand mixtures, little or no coarse fraction is fines. larger than No. 4 GP Poorly graded gravels, gravel sieve size but sand mixtures, little or no smaller than 3". fines. GRAVELS WITH FINES GM Silty gravels, poorly graded (Appreciable amount gravel-sand-silt mixtures. of fines) GC Clayey gravels, poorly graded gravel-sand, clay mixtures. SANDS CLEAN SANDS SW Well graded sand, gravelly More than half of sands, little or no fines. coarse fraction is SP Poorly graded sands, gravelly smaller than No. 4 sands, little or no fines. sieve size. SANDS WITH FINES SM Silty sands, poorly graded (Appreciable amount sand and silty mixtures. of fines) SC Clayey sands, poorly graded sand and clay mixtures. II. FINE GRAINED, more than half of material IS smaller than No. 200 sieve size. SILTS AND CLAYS ML Inorganic silts and very fine sands, rock flour, sandy silt or cl jyey-silt-sand mixtures with slight plas- tic1ty. Liquid Limit CL Inorganic clays of low to less than 50 medium plasticity, gravelly clays, sandy clays, silty clays, lean clays. OL Organic silts and organic silty clays or low plasticity. SILTS AN0 CLAYS MH Inorganic silts, micaceous or diatomaceous fine sandy or silty soils, elastic silts. Liquid Limit CH Inorganic clays of high greater than 50 plasticity. fat clays. OH Organic clays of medium to high plasticity. HIGHLY ORGANIC SOILS PT Peat and other highly organic soils. . \ 11 - Water level at time of excavation CK - Undisturbed chunk sample 7 or as indicated BG - Bulk sample us - Undisturbed, driven ring sample SP - Standard penetration sample or tube sample SOUTHERN CALIFORNIA LAKE CALAVERA GOLF COURSE SOIL & TtSTINO,INC. py: U-K DATE: Z-04-91 JOB NUMBER: 8921130 Plate No. 2 0 2 4 6 a 10 12 14 1c I i > b u 3 3 z I B U - U - U \ 1L SM - Illt/ SW SC SM BORING NUMBER 1 ELEVATION 215 DESCRIPTION ALLUVIUM, Grayish Brown, SANDY and CLAYEY SILT with Organics Light Grayish Tan, Fine SILTY SAND Gyish Brown to Light Grayish Brown, Inter- bedded SANDY and CLAYEY SILT, CLAYEY SAND and SILTY SAND (Cobbles at 11.0 Feet) SANTIAGO FORMATION, Grayish White, SILTY SAND Bottom of Boring at 15.0 Feet Wet Wet Satur- ated Satur- ated ,L zc fw-, Oe+ m= U-W kCn0 a2 *OK o” Very Soft Very Loose roosii- and Soft Dense 4 8 79 Wbp K - 3 I- z t; w 0 ‘; s 0 0 iz w I > 0 c c’ ( 0 4 a w 0 K 3E 0 0 * - 95.2 - - 28.9 103.8 22.9 117.9 13.9 SOUTHERN CALIFORNIA SOIL &TESTING, INC. SUBSURFACE EXPLORATION LOG LOGGED BY: MF I DATE LOGGED: 12-11-! JOB NUMBER:8921130-4 Plate No. 3 I 6 16 jM SW SC BORING NUMBER 2 ELEVATION 216 DESCRIPTION ARTIFICIAL FILL, Brown, SILTY SAND with Few Gravel (Road Fill at Ravine) ALLUVIUM, Light Gray, Fine SILTY SAND inter- bedded with CLAYEY SAND Layers SANTIAGO FORMATION, Grayish White, Fine SILTY SAND Bottom of Boring at 15.5 Feet I- w Z K w 3 2 t; p” G q I Humid Moist Very Moist Satur- ated Humid? ,L zc =W- l-v) 2: aQ)n 02 *o Oc a0 Medium Dense Medium Dense Dense 3516" WP K - 3 I- z G w 0 5 s 0 c) 44 119.5 20 43 105.5 115.2 7.8 19.7 16.1 SOUTHERN CALIFORNIA SOIL &TESTING, INC. BORING NUMBER 3 ELEVATION 224 WZ K - 3 + z k w 0 ; = 0 0 4 I 6. 10 I 12' 14 I 16' 18 I 20' 22' 241 I 26 DESCRIPTION SM ALLUVIAL/ROAD FILL, Brown to Reddish Brown SILTY SAND iumid Yed Den to Den us 56 108.7 16.1 10 12 109.8 120.0 -- 6 94.8 8.5 11.7 jM/ SC ALLUVIUM, Dark Brown to Dark Reddish Brown SILTY and CLAYEY SAND Yed Den Sof Sti ano Lot to Met Den qoist Very Yoist Humid? - Dark Blackish Brown, SILTY SAND interbedded with SANDY SILT, CLAYEY SAND and Organics, Occasional Gravel Layers SW SC/ YL 25.8 W CL SANTIAGO FORMATION, Greel with Rust Mottling, SANDY CLAY and SANDY SIL’ Ver Sti us \ 43 Bottom of Boring at 25.0 Feet SOUTHERN CALIFORNIA SOIL &TESTING, INC. PLORATION LOG DATE LOGGED: 12-12-! Plate No. 5 _- - - _.. - - - - - - - ~. a<:‘;; KC * +a= 0 - 2- 4 i 6- 8 I 10 - O- - 2 I 4- - 6- a I a 10 - s BORING NUMBER 4 ELEVATION WZ K - 3 I- 2 t; w G ‘; 5 0 0 DESCRIPTION BG \ BG us BG \ us SM TOPSOIL, Light Brown Fine SILTY SAND Dry to Humid Humid Ed- -- Humid Loose Dense &vSeery Hard Very Dense SM SANTIAGO FORMATION Gray- ish White, Fine SILTY SAND - Ken CLAYEY and SANDY SILT 50/6" -- -- 100 -- .- 10.1 ML SM Grayish White Fine SILTY SAND 107.8 Bottom of Boring at 9.0 Feet (Difficult Drilling at 6 Feet) BORING NUMBER 5 Date: 2-12-S SM TOPSOIL, Light Grayish Brown, Fine SILTY SAND Loose Dense to Vet-3 Dense SM SANTIAGO FORMATION, Grayish White SILTY SAND 113.5 6.7 7.5 100 100 (Difficult Drilling at 5 Feet) 113.1 Date: .2-14-t Bottom of Boring at 10.0 Feet SOUTHERN CALIFORNIA SOIL &TESTING, INC. SUBSURFACE EXPLORATION LOG LOGGED BY: MF I See DATE LOGGED: Ahnve JOB NUMBER: 8921130-41 Plate No. 6 ii! E ; BORING NUMBER6 c w zc fi ii i ,L bp * WZ z k < Z K z SG K - W 2 2 i i? ELEVATION w 3 KC N<; z- 3 I- > 0 v)z KC 0” ; ii u-w +cne 2 c E a !it s u,v, z w q 0 W nmn W’. s az P P a v) P zma G g a .m a es 4:oK w s 2 v” i!K2 o z x 0 E I DESCR IPTloN ;: P 0 0 0 0 SM TOPSOIL/SLOPEWASH, Gray- Dry to Loose ish Brown SILTY SAND with Humid 2- GRAVEL GRANITICS, Gray to Light Dry Very 100 Rust, SILTY SAND and SAND Dense Bottom of Boring at 3.5 Date: 12-11-g 1 Feet, Near Refusal BORING NUMBER 7 0 SW SLOPEWASH/ALLUVIUM, Brown Dry to Loose GM SILTY SAND with GRAVEL Humid to a z- Medium Dense (Cobbles Between 3.5' and 4- 5') 6-\ US SM/ GRANITICS, Gray to Light Dry Very 100 SP Rust, SILTY SAND and Dense SAND I Bottom of Boring at 6.0 Date: 12-14-9c, Feet, Near Refusal SOUTHERN CALIFORNIA SUBSURFACE EXPLORATION LOG See SOIL &TESTING, INC. LOGGED BY: MF DATE LOGGED: Above JOB NUMBER:892113&4 Plate No. 7 : 2 g BORING NUMBER 8 g w 7 * z c a K E !!i i t? ELEVATION 228 l? L : :::I cn 2 W (L ;5 P q v) cn < e I DESCRIPTION 0” 0-r SW ALLUVIUM, Dark Grayish Moist Medium SC/ Brown, Interbedded SILTY Dense 2- ML SAND, CLAYEY SAND and SANDY SILT Very Moist 4 us 13 109.8 19.7 61 Satur- T ated 8 SW Brown, SILTY and CLAYEY Satur- Medium us sc SAND with GRAVEL ated Dense 27 115.3 17.6 10 12- GRANITICS, Reddish Brown, Moist Very 100 124.9 10.0 SILTY SAND Dense Feet BORING NUMBER 9 SM TOPSOIL, Brown, Fine Dry Loose SILTY SAND 2 BG SM/ GRANITICS, Gray to Light Humid Very 100 Rust SILTY SAND and SAND Dense Bottom of Boring at 3.5 Feet, Near Refusal SOUTHERN CALIFORNIA , SUBSURFACE EXPLORATION LOG SOIL &TESTING, INC. LOGGED BY: MF DATE LOGGED: 12-14-I JOB NUMBER:8%?113&4 Plate NO. 8 U.S. STANOARD SYVES HYDROMETER (WUJTES) 36’ 18’ 2’ 1’ 112’ 114’ 210 120 #40 160 GRAM SIZE (mm) PAFlTlCLE SIZE LIMITS I BOULDER; COBBLE GRAVEL SAND SILT OR CLAY I COARSE FWE FINE (12’) 3 314 No. 4 No. 10 No. 40 No. 200 U.S. STANDARD SIEVE SIZE 66 @ 2.5’-3.5’ 1000 100 IO 1.0 0.1 .Ol 001 I I 3 5 6 4 5 6 I I I I I I J I I IF I I I I I I I I Ii i III I I III I I IIIII / / I I II I I I I I III I I I I , I,, I llil I Ii \I I III1 \ / -1 1 I I !lil I I I 1 / , - - 0.1 0.5 1.0 5 10 I 50 LOAD kips/sq.ft. SOUTHERN CALIFORNIA LAKE CALAVERAS GOLF COURSE SOIL & TESTING LAB, INC. By SPEO RIVERDALE STREET CHC DATE l-22-91 SAN DIE~O, CALIFORNIA sale0 JoBNo. 8921130 Plate No. 10 g1 2 2i 2 6 i=3 d $4 .i5 00 LOAD kips/sq. ft. - -- SOUTHERN CALIFORNIA LAKE CALAVERAS GOLF COURSE SOIL & TESTING LAB, INC. By DATE OR80 RIVERDALE STREET CHC 1-22-91 SAN DILOD, CALIFORNIA me190 JOB NO. 8921130 Plate No. 11 . 1 ! -1 1 1 I 1 1 1 -. L 1. 1 L I- L 1 1 0 1 2 3 E z & a 5 i= 3 $ 3 I I I 0.1 0.5 1.0 5 .* 10 4 50 LOAD kips/sq. ft. SOUTHERN CALIFORNIA LAKE CALAVERAS GOLF COURSE SOIL & TESTING LAB, INC. By memo RIVERPALE STREET CHC OATE 1-22-91 BAN OICOO, CALIFORNIA aeieo JOB NO. 8921130 Plate No. 12 - Jh-/1~ /AdD 4eQ’fls’ Dl - lG1’ ma$/o4 /A# ‘=A : 4% &/zJ~&4c’( IlSd ** LOJ’ 5 ,I,, III1 1 1 I 1 1 I I I , I I 1 1 I I I I 1 1 1LIIlllI O~~~~~~~l~~~i~lt++tm~“““““~~~~l~~~~~l~l~~ 1 2 3 4 5 2M L NOR& STRESS, KSF ANQLE OF IWTERNAL COHESION INTERCEPT SAMPLE DESCRIPTION FRICTION (‘1 84 @ 8' Undisturbed 37 LtJO EXPANSION INDEX TEST RESULTS SAMPLE No. B 4 @ 2’-5 EXPANSION INDEX: 48 CLASSIFICATION: LOW I SOUTHERN CALlFORNlA LAKE CALAVERAS GOLF COURSE SOIL & TLSTINO,IWC. y: CHC DATE: 1-22-91 JO8 NUMBER: 8921130 Plate No. 13