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Home My WebLink AboutCT 12-05; LA COSTA RESIDENTIAL; ROUGH GRADE COMPACTION REPORT; 2014-09-09:STRATA-TEC H,I N C. 714-521-5611 GEDCDNEULTANTE FAX 714-521-2552 7372 Walnut Avenue, Unit F,Buena Park, California 90620 September 9, 2014 W.O. 263810 Tony Sfreddo D.S. Products, Inc. 24 Amberleaf Irvine, California, 92614 Subject: Rough Grade Compaction Report for Proposed Multi Family Residential Development, 7500 Jerez Court, Carlsbad, California Reference: STRATA-TECH, INC., Geotechnical Engineering Investigation of Proposed Multi Family Residential Development, 391 Tamarack Avenue, Carlsbad, California., Dated October 4, 2011 Gentlemen: Submitted herewith is the Rough Grade Compaction Report for the subject site. The grading operation was conducted between April7, 2014 and September8, 2014, utilizing the recommendations of the referenced report. Observations of the grading were provided by STRATA-TECH, Inc. PLACEMENT OF STRUCTURAL FILL Compacted fill was placed on the subject site to provide adequate support for the proposed 2- story Multi Family Residential Development OBSERVATIONS DURING GRADING Preparation for placement of a compacted fill included overexcavation to approximately 3 feet below existing grade, and 5-feet beyond the building foundation to provide a minimum, of 2-foot of compacted fill under the footings of the proposed building. Prior to placement of fill, the bottom was made level, scarified, watered and tamped smooth. Subsequent fills were placed in 6 to 8 inch loose lifts and compacted to a minimum of 90 percent. The pads were raised approximately 3 feet in the back to allow for drainage toward Jerez court. The driveway portion of the site was left low to allow for placement of footing excavation soil. STRATA - TECH,INC. GE 0 CON S U LTA NT S D.S. Products, Inc. 2 W.O. 263810 Rough Grade Compaction Report September 9, 2014 Final rough finish grade is approximately 6 inches below the finish floor grade in order to allow placement of sand and concrete for the slab-on-grade building. Approximate limits of grading for the pad area is shown on Plate A. TESTING Maximum density optimum moisture relationship determinations were performed for each soil type encountered during grading operations. Test results were as follows: Laboratory Standard: (ASTM: D-1557-91) 4 inch dia. mold; 1/30 cu.ft.vol.; 5 layers-25 blows per layer; 10 lb. hammer dropped 18 inches Soil Type Classification Optimum Moisture % Max. Dry Density lbs/fl Light Brown Fine clayey 12 128.0 Sand Import, Brown clay Sand 10 132.0 wlrock chips Compaction tests were performed a minimum of every 2 feet and/or 500 cubic yards of compacted fill soils placed. These tests were performed in accordance with ASTM: D-2922-91 (nuclear gauge) or ASTM: D-1557-04 (sand cone) test methods. The test results are summarized in Table I. The approximate test locations are shown on Plate A. Areas not tested were probed to show adequate compaction. FOUNDATIONS ON COMPACTED FILL The proposed building may be supported by continuous spread footings placed a minimum depth of 18 inches below lowest adjacent finish grade utilizing an allowable bearing value of 1,500 pounds per square foot. This value is for dead plus live load and may be increased 1/3 for total including seismic and wind loads where allowed by code. Type Minimum Depth (inches) Minimum Width (inches) Bearing Value (psf) Increase Maximum (ps) Width Depth (pstill) (psi/fl) Continuous 18 12 2000 180 440 3500 It is recommended that all footings be reinforced with a minimum of four No. 4 bars (2 top and 2 bottom). The structural engineer's reinforcing requirements supersede if more stringent. STRATA - TECH,INC. G EDCON S U LTANTS D.S. Products, Inc. 3 W.O.263810 Rough Grade Compaction Report September 9, 2014 Footing excavations shall be observed by a representative of STRATA-TECH, Inc. prior to placement of steel or concrete to verify competent soil conditions. If unacceptable soil conditions are exposed mitigation will be recommended. LATERAL DESIGN An allowable lateral bearing value against the sides of footings of 250 pounds per square foot, per foot of depth, to a maximum of 2,000 pounds per square foot may be used, provided there is positive contact between the vertical bearing surface and compacted fill. Friction between the base of the footings and/or floor slabs and the underlying material may be assumed as 0.35 times the dead load. Friction and lateral pressure may be combined, provided either value is limited to two-thirds of the allowable. The above values may be increased by one-third for short durations of seismic and wind loads. FLOOR SLABS The surface soils have a medium expansive potential. Slabs on grade shall be supported on engineered fill compacted to a minimum of 90 percent relative compaction. Slabs should be reinforced with at least No. 4 bars 18 inches on center both ways. The soil should be kept moist prior to casting the slab. However, if the soils at grade become disturbed during construction, they should be brought to approximately optimum moisture content and rolled to a firm, unyielding condition prior to placing concrete. In areas where a moisture sensitive floor covering will be used, a vapor barrier consisting of a plastic film (6 ml polyvinyl chloride or equivalent) should be used. The vapor barrier should be properly lapped and sealed. Since the vapor barrier will prevent moisture from draining from fresh concrete, a better concrete finish can usually be obtained if at least 2 inches of wet sand is spread over the vapor barrier prior to placement of concrete. HARDSCAPE AND SLABS Hardscape and slab subgrade areas shall exhibit a minimum of 90 percent relative compaction to a depth of at least 1 foot. Deeper removal and recompaction may be required if unacceptable conditions are encountered. These areas require testing just prior to placing concrete. STRATA - TECH,INC. G ED CD NB U LTA NT S D.S. Products, Inc. 4 W.O. 263810 Rough Grade Compaction Report September 9, 2014 POST-GRADING SERVICES During construction of the residence, it is recommended, and at times required by the regulatory agency that the following be observed and/or tested by the geotechnical engineer: Excavations of footings Backfill of interior slab areas Backfill of interior trenches Backfill of exterior utility trenches Hardscape, and pavement subgrade It is the responsibility of the developer to schedule the required observations and testing. REGULATORY COMPLIANCE All cuts, fills or processing of original ground under the purview of this report have been completed under the observation of and with selective testing by STRATA-TECH, Inc., and found to be in compliance with the Grading Code of the City of Carlsbad. The completed work has been observed by STRATA-TECH, Inc., and is considered adequate for the development. Our findings were made and recommendations prepared in accordance with generally accepted professional engineering practices, and no further warranty is implied nor made. This report is subject to review by the controlling authorities for this project. We appreciate this opportunity to be of service to you. Respectfully submitted: STRATA-TECH, Inc. Roland Acufia Larry Finley Principal RCE 46606 Enclosures: Compaction Test Results Plate A - Compaction Test Map 714-521-5611 S T R A T A - T E C H , I NC. 562-427-8099 B E D - C 0 N S U L T A N T 8 FAX 714-521-2552 7372 Walnut Avenue, Unit F,Buena Park, California 90620 COMPACTION TEST RESULTS Test Location Below Proposed i!(iL/( (/1) - Moisture Content % -- Dry lull lJcic.'/Ii Soil (lbs/I) 'ii, RL'hllfl'' Compaction Date 1 Building Pad 5 12.3 116.9 I 91% 4/7/14 2 Building Pad 3 11.8 116.7 I 90% 3 Building Pad 5 12.8 116.9 I 90% 4/8/14 4 Building Pad 3 12.1 117.3 I 91% 5 Building Pad 2 12.2 117.6 I 91% 6 Building Pad 2.5 12.4 118.1 90% 4/9/14 7 Building Pad 2 12.1 117.9 I 90% 8 Building Pad 3 11.5 118.3 I 91% g Building Pad 2 11.6 118.5 I 91% io Building Pad PG 10.2 119.8 I 91% 4/11/14 ii Building Pad PG 10.3 119.6 I 91% 12 Building Pad 3 12.1 120.2 II 4/17/14 13 Building Pad 2.5 12.1 119.3 II 92% 14 Building Pad 1 13.5 122.2 II 93% 15 Building Pad 1 9.9 122.7 II 93°1 16 Building Pad PG 10.1 123.5 II 4/25/14 17 Building Pad PG 10.2 122.2 II 92% 18 Sewer 4 9.7 119.8 II 92% 19 Sewer 2 8.9 120.5 II 92 7/11/14 20 Electric 2 8.6 121.0 II 91 21 Building Pad* P.G 8.2 121.4 Il 92% 1 9/8/14 22 Building Pad * P.G 8.5 121.5 II 92% 1 PG= Pad Grade *reteSt - \\ . - blockraff 1H•-'I- 6 721 privo C3.2 _' 1520. WZI - I 6 101510-S Proposed P 10 tU . Building 2 at 11 12 ' .. - - - -. o#o •- - 10.0001 1701 - ' Proposed ......S - I - r, . . - -- . .0 Soil rolls priso 390 0? 5 pol o BuIlding - - 'S p0000.00 Od -.. high -, - S -• -- W.I,fofllso 4510 - . - S . -: - .- - . / - - - - - - -- S .000000. lon000000 '000.1.__5 • "O-/' - - - . 0"41 I 00 0 poltl 9 009 9. I 900020 0 A prl of. 0400,30 of __________ / _______________ I.- .? - •-• . Jerez Court WAflOO ------------------------------- I 1005009040 -- 042.0,00 r.E0l6•04WW .01.110 0 fll9h 104250011 10190050 00060u, .01.9 6 nt 42 015 5poApol0S.6 bOcOwdi 1060 .01 0101001 La Costa Vista VF.' --'- 7-unit Residental Condominium Project kL2 Site Plan: 1.1 7000JE00000URT,CARLSOADSCA APN:296.200.O8 Split r proInt data 640-atone P04010 Planned T0nt0tIV0Tl0ot1 hIt Floor Am, 100 dM0. 0040091000 soto8, 10r0, No.5, PAnA(9.0odrro): 2-41001.0,400040-. 2,4600415 P1400 (0-Sd or): a-onto 1.1,403.q.0- • 2,988.q. genevel lotOrnietlen Intl. CII) of C011.bod, County 010,0, Pion C (0-409 no): 0410501.1,002 044.. 3,070 ,q,lt, do 00000W.IIOSCOS10bOAMOI00POIWOS000AOIOI 000.0. tlron09 0,009 09. - TMtPMENT 32 SYLVA IRVINE, CA 00000 0.6.03 00000.d'l0005tal010 (7 7-sON) 0040)03 Proposed: 17950409.0,0(7.4041.) P00000.0 0011d160 01007 Ar_S • 090.001.0900 0oI.6ng 5000 00.01 400.01 01070.00 0lslld)0rg 1: 7,750 .q.tt • - 001411005 BEGOVICII+i4AUGARCH005CTS 01000ud 1.0050 UO.17.CO0dol0J142I4 0040 Und.o.iop.010 .10. 60 00 not 00p9.0b14 00Sd 0'902, 4102 09(5 ToSs 14014040 LONG OEACH,CA00600 4090100. 17,6750411(40010) - P014lrrgr.qo104dl - 000.080,1174 Landscape0,..1 0,10400-3-120') 2.0 0p000010,rll. 7 • 14.0 - 00 .000 01011 onDIASgno.r: ULTANTS Lot USonolo LAO Coo.,aO. 0(00.001 (0,08000.0- .60% 0000090 0109000d1 6,00409(5 • 0.3 900.1 60042011000 • 0.1000000 - LEWIS ST. #101 012377 olol.p.o.. r.qoio.d • 10.0(17)000.0. GARDEN GROVE,CA 02460 P4000. P.9000.. Requited:.lVor4i(odn) p.40000,00)d.d 714.740.6040 - 011v.t.P.40 4100 P1000.0501 117.001.3000(01540400) Ooosp.nor.930w42r ) 5oroo0(0V 00441040 .900SUnit • 14,0 000400 GALA6SCAPE lola ROMPER AVE o.prink0o,IAA4rro42!oopl1nk0r. 10991560 0100 SAMOA AMA, CA 02700 714.000.6000 ,00l00090l009lzp000loo W000101.t000:I1l0105lIl10r000l0rIlOt0r00M00400t01m0I01 totOl 0000.010410.0 . 179.p.on