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Home My WebLink AboutCT 01-05; CALAVERA HILLS VILLAGE W; GEOTECHNICAL UPDATE FOR PHASE 6; 2005-01-18FIECEIVED CT 01-05 JAN 2 4 UU '.O/cFIELDHOMES:' ikeQi!P!c. Geotechnucal Geol6gic,,4, Environmental 5741 Palmer Way • Carlsbad California 92008 • (760)438 3155 • FAX (760) 9;31-0915 January 18, 2005 WO. 4254-C-SC "p 4 - Brookfield Homes 12865 Pointe Del Mar, Suite 200 Del Mar, California 92014 Attention Ms Teri McHugh and Ms Lindsey McClintic 4. Subject Geotechnical Update for Phase 6, Lots 10 through 20, Village W, Calavera Hills II, Carlsbad, San Diego County, California Dear Ms McHugh and Ms McClintic 4. .' In accordance with your request, GeoS4ils, Inc (GSI) has reviewed the referenced reports (seethe Appendix) with respect to as-graded site conditions and has prepared this update report Grading and processing of original ground within the subject building pads was observed and selectively tested by a representative of GSI during the earthwork phase of development for the subject property. Based on our observations and testing, the site is considered suitable for its intended residential use Geotechnical observations and testing completed during site grading, and completed by this office, is summarized in GSI (2004a) As of this date, the site has not changed significantly since the completion of graidina and the issuance of GSI (2004a), thus, the findings, conclusions, and recommendations presented in our referenced reports (see the Appendix), including GSI (1999 and 2004a), are generally considered valid .and applicable.with respect 'to the construction" and development of the subject building pads Based on the duration of time following pad completion, prewetting is recommended, as indicated in GSI (1999 and 2004a) - •-. • . . Inasmuch as our studyis based.upon our, review, engineering analyses, and laboratory data, these conclusions and recommendation are professional opinions These opinions have been derived in accordance with current standards of practice, and no warranty is express or implied Standards of practice are subject to change with time GSI assumes no.responsibility or liability for work or testing performed 1by others, or their inaction, or work performed when GSI is not requested to be onsite to evaluate if our recommendations have been properly. implemented Use of this report constitutes an agreement and consent by the user to all the limitations outlined above notwithstanding any other agreements that may be in place In addition, this report may be subject to 'review by the controlling authorities'. uthoritie - . - . -- S - - 0 ,• - - -' 0_ -4 1' S 0 •' - :o • ' - - -" .' •- : - - •'' - -- -- ••0. , ' 0 - I - - A - '__ . ' - - - 0 0•' - '- I. SUMMARYOF RECOMMENDATIONS REGARDING . GEOTECHNICAL OBSERVATION AND TESTING We recommend that observation and/or testing be performed by GSI at each of the following construction stages: During grading/recertification. During excavation.. During placement of subdrains, toe drains or other subdrainage devices, prior to placing fill and/or backfill. . After excavation of building footings, retaining wall footings, and free standing walls - . footings, prior to the placement of reinforcing steel or concrete. . Prior to pouringany slabs or flatwork, after presoaking/presaturation of building pads and other flatwork subgrade, before the placement of concrete, reinforcing steel, capillary break (i.e., sand, pea-gravel, etc.), or vapor barriers (i.e., visqueen, etc.). During retaining wall sübdrain installation, prior to backfill placement. . During placement of backfill for area drain, interior plumbing, utility line trenches, and retaining wall backfill.' . . During slope construction/repair. ,• . - When any, unusual soil conditions are encountered during, any construction operations, subsequent to the issuance of this report. When any developer or homeowner improvements, such as flatwork, spas, pools, walls, etc., are constructed, prior to construction. . A report of geotechnical observation and testin g should be provided at the conclusion of each of the above stages, in order to provide concise and clear documentation of site work, and/or tocomply with code requirements. • GSI should review project sales documents to homeowners/homeowners associations for geotechnical aspects, including irrigation practices, the conditions outlined above, etc., prior to any sales. At that stage, GSI will provide homeowners' maintenance guidelines which should be incorporated into such documents. • . H Brookfield Homes . • W.O. 4254-C-SC 1; Village W, Phase 6, Calavera Hills - . 'January 18, 2005 - File: e:\wp9\4200\4254cguf6 ' • . . 'Page 2 - GeOSoils, 'Inc. . .. . . . OTHER DESIGN PROFESSIONALS/CONSULTANTS The design civil engineer, structural engineer,.post-tension designer, architect, landscape architect, wall designer, etc., should review the recommendations provided herein, incorporate those recommendations into all their respective plans, and by explicit reference, make this report part of their project plans This report presents minimum design criteria for the design of slabs, foundations and other elements possibly applicable to the project These criteria should not be considered as substitutes for actual designs by the structural engineer/designer. Please note that the recommendations contained herein are not intended to preclude the transmission of water or vapor through the slab or foundation. The structural engineer/foundation and/or slab designer should provide recommendations to not allow Water or vapor to enter into the structure so as to cause damage to another building component, or so as to limit the installation of the type of flooring materials typically used for the particular application. The structural engineer/designer should analyze actual soil-structure interaction and consider, as needed, bearing, expansive soil influence, and strength, stiffness and deflections in the various slab, foundation, and other elements in order to develop appropriate, designspecific details. As conditions dictate, it is possible that other influences will also have to be considered. The structural engineer/designer should consider all applicable codes and authoritative sources where needed If analyses by the - structural engineer/designer result in less critical details than are provided hereimas minimums, the minimums presented herein should be adopted. It is considered likely that some, more restrictive details will be required., If the structural engineer/designer has any questions or requires further assistance, they should not hesitate to call or otherwise transmit their requests to GSI In order to mitigate potential distress, the foundation and/or improvement's designer should confirm to GSI and the governing agency, in writing, that the proposed foundations and/or improvements can tolerate the amount of differential settlement and/or expansion characteristics and other design criteria specified herein. PLAN REVIEW Final project plans (grading, precise grading, foundation, retaining wall, landscaping, etc.), should be reviewed by this office prior to construction, so that construction is in accordance with the conclusions and recommendations of this report. Based on our review, supplemental recommendations and/or further geotechnical studies may be warranted. • .• ', Brookfield Homes • W.O. 4254-C-SC Village W, Phase 6, Caiavera Hills • January 18, 2005 FiIe:e:\wp9\42OO4254c.guf6 , Page 3 GeoSoils Inc. •: LIMITATIONS The materials encountered on the project site and utilized for our analysis are believed representative of the area, however, soil and bedrock materials vary in character between excavations and natural outcrops or conditions exposed during mass grading Site conditions may vary due to seasonal changes or other factors. Inasmuch as our study is based upon our review and engineering analyses and laboratory data, the conclusions and recommendations are professional opinions These opinions have been derived in accordance with current standards of practice, and no warranty, either express or implied, is given Standards of practice are subject to change with time GSI assumes no responsibility or liability for work or testing performed by others, or their, inaction, or work performed when GSl is not requested to be onsite, to evaluate if our recommendations have been properly implemented Use of this report constitutes an agreement and consent by the user to all the limitations outlined above, notwithstanding any other agreements that may be in place In addition, this report may be subject to review by the controlling authorities Thus, this report brings to completion our scope of services for this portion of the project. All samples will be disposed of after 30 days, unless specifically requested by the client, in writing. Brookfield Homes W.O. 4254-C-SC Village W, Phase 6, Calavera Hills January 18, 2005 File:e:\wp9\42004254c.guf6 Page 4 GeoSoils, Inc. APPENDIX . REFERENCES . GeoSoils, Inc., 2004a, Report of rough grading, Calavera Hills, Village W, Building Lots 1 through 114 and Recreation Lots .115 and 117, Carlsbad Tract 01-05, Carlsbad, San Diego County, California, W.O. 3459-Bi -SC, dated October 4. 2004b, Interim report of rough. (mass) grading, Phase 2, Lots 59 through 68, and Lots 103 throughll3, and Phase 3, Lots 45 through 58, and 69 through 747 Calavera Hills II, Village W, City of Carlsbad, San Diego County, California, W.O. 4254-B-SC, dated September 29. . .. . 1999, Update of geotechnical report, Calavera Hills, Village W, City of Carlsbad, • California, W.O. 2750ASC, dated October 22. : . . International Conference of Building Officials, 2001, California building code, California Code of Regulations, Title 24, Part 2, Volume 2, Adopted November 1. • 1997, Uniform building code. • • • . ,1 . ., .. .. i• • • • H • • • • • . V • GeoSoils, Inc • • •