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HomeMy WebLinkAboutCDP 2021-0025; SWAN RESIDENCE; GEOTECHNICAL INVESTIGATION; 2019-10-09PROJECT NO. FIGURE NO. GEOTECHNICAL CONSULTANTS HETHERINGTON ENGINEERING,INC. ADAPTED FROM: The Thomas Guide, San Diego County, 57th Edition, Page 1106 SCALE: 1" - 2000' (1 Grid Equals: 0.5 x 0.5 miles) LOCATION MAP 1 2668 Ocean StreetCarlsbad, California 8889.1 N PLOT PLANGEOTECHNICAL CONSULTANTSHETHERINGTON ENGINEERING,INC.PROJECT NO. FIGURE NO.0125 10152002668 Ocean StreetCarlsbad, California8889.1NSCALE: 1" = 10'2LEGENDAPPROXIMATE LOCATION OF HAND AUGER BORINGHA-2HA-1HA-2Base Map: TRE Architecture, "Swan Residence, Carlsbad , California," dated November 25, 2019 (Sheet A1.1). 101 100 101 108 106 SM TOPSOIL: Gray brown silty sand; dry to damp, loose, contains roots/rootlets WEATHERED TERRACE DEPOSITS: Orange brown silty sand; dry to damp, medium dense, contains roots/rootlets @4': Orange brown silty sand; moist, medium dense, scattered roots Total depth 11.5-feet No groundwater No caving 3.8 4.8 4.8 3.8 4.6 SOIL CLASS.(U.S.C.S.)8889.1 3 40lb DRIVE SAMPLEBLOWS/FOOTDRY DENSITY(pcf)MOISTURECONTENT (%)RIG: DROP: INC. GEOTECHNICAL CONSULTANTS PROJECT NO. BORING NO. SOIL DESCRIPTION FIGURE NO. ELEVATION: DATE: BORING LOG 4"BORING DIAMETER:DRIVE WEIGHT:30"DEPTH (FEET)BULK SAMPLE0.0 5.0 10.0 15.0 20.0 Mansolf Excavation '+ HA-1 DRILLING COMPANY: HETHERINGTON ENGINEERING, - 2668 Ocean Street 09/16/19 Carlsbad, California Hand Auger 106 112 105 106 105 SP ARTIFICIAL TURF: 1.5-inches thick FILL: Orange brown gravelly sand; moist, loose WEATHERED TERRACE DEPOSITS: Dark orange brown sand; moist, medium dense, contains scattered rootlets @7': Light orange brown sand; moist, medium dense Total depth 11.0-feet No groundwater No caving 7.5 8.5 7.4 5.9 6.2 SOIL CLASS.(U.S.C.S.)8889.1 4 40lb DRIVE SAMPLEBLOWS/FOOTDRY DENSITY(pcf)MOISTURECONTENT (%)RIG: DROP: INC. GEOTECHNICAL CONSULTANTS PROJECT NO. BORING NO. SOIL DESCRIPTION FIGURE NO. ELEVATION: DATE: BORING LOG 4"BORING DIAMETER:DRIVE WEIGHT:30"DEPTH (FEET)BULK SAMPLE0.0 5.0 10.0 15.0 20.0 Mansolf Excavation '+ HA-2 DRILLING COMPANY: HETHERINGTON ENGINEERING, - 2668 Ocean Street 09/16/19 Carlsbad, California Hand Auger LABORATORY TEST RESULTS Figure 5 Project No. 8889.1 Log No. 20676 SULFATE TEST RESULTS (Cal Test 417) Sample Location Soluble Sulfate in Soil (%) HA-1 @ 2 to 5’ 0.032 DIRECT SHEAR (ASTM: D 3080) Sample Location Angle of Internal Friction () Cohesion (psf) Remarks HA-1 @ 8’ 36 0 Undisturbed, soaked, consolidated, drained MAXIMUM DRY DENSITY/OPTIMUM MOISTURE CONTENT (ASTM: D 1557A) Sample Location Description Maximum Dry Density (pcf) Optimum Moisture Content (%) HA-1 @ 2 to 5’ Orange brown silty sand 130.0 9.5 EXPANSION INDEX (ASTM: D 4829) Sample Location Initial Moisture (%) Compacted Dry Density (pcf) Final Moisture (%) Expansion Index Expansion Potential HA-1 @ 2 to 5’ 8.4 115.7 13.8 0 Very low ATTERBERG LIMITS (ASTM: D 4318) Sample Location Liquid Limit (%) Plastic Limit (%) Plasticity Index (%) U.S.C.S. Class HA-1 @ 2 to 5’ - - - Non-plastic