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HomeMy WebLinkAboutCT 04-10A; POINSETTIA PLACE; REPORT OF GEOTECHNICAL TESTING AND OBSERVATION ROUGH GRADING FOR BUILDING PAD 7; 2012-11-07GeoTek, Inc. 1384 Poinsettia Avenue, Suite A Vista, CA 92081-8505 (760) 599-0509 Office (760) 599-0593 Fax www.geotekusa.com November 7, 2012 PN 3389-SD Shea Homes Limited Partnership, San Diego 9990 Mesa Rim Road San Diego, California 92121 Attention: Ms. Sarah Beckman Subject: Report of Geotechnical Testing and Observation Rough Grading for Building Pad 7 CT 04-10 Carlsbad, California 92009 Dear Ms. Beckman, In accordance with your request, GeoTek, Inc. is pleased to provide herewith the results of our geotechnical testing and observation services during rough grading associated with construction of Building Pad 7 on Tract CT 04-10, Carlsbad, California. Construction Summary This report Is limited to grading of the subject building pad. Recent grading occurred in two different time periods and was performed by two contractors. In early 2011 approximately three (3) feet of the pre-existing fill was removed and recompacted by Heartland Grading. In late 2011 and early 2012, the ground surface was scarified and additional fill placed grading by TNT Grading. Fill placed was derived from on site materials and materials derived from the extension of Poinsettia Lane south and east of the tract. I Field density and laboratory test results indicate that the fill materials were compacted to a minimum of 90 percent relative compaction at the locations tested. The field density test results are included in Table 2. The approximate locations of the field density tests related to the grading for the subject building pad are shown on Figure I. it should be noted that the area of removals and engineered fill is limited to the area indicated on Plate I. I GEOTECHNICAL I ENVIRONMENTAL I MATERIALS I All material herein © 2012 GeoTek, Inc. All Rights Reserved I Shea Homes Limited Partnership, San Diego November 7, 2012 I Report of Geotechnical Testing and Observation Project No. 3389-SD Build1nLPad1Ct04d0 W2 2 I Field Testing I Our field density testing was performed in general accordance with ASTM Test Method D6983. Our field density testing program was conducted as follows: Field density tests were taken at periodic intervals and random locations to check the compaction efforts by the contractor. Visual classification of the soil in the field, compared to the soil descriptions from the laboratory testing, was the basis for determining the maximum density and optimum moisture content applied to each field density test Laboratory Testing The laboratory testing pertinent to field density tests is the Moisture-Density Relationships for the various soils encountered: The laboratory maximum dry density and optimum moisture content for soil types tested were determined in general accordance with test method ASTM Dl 557. Laboratory test results are presented in Table I. I Conclusions It is our professional opinion that the site is suitable for the intended use provided that site I construction and future maintenance is performed in accordance with the recommendations presented herein and in the reference reports. Based on the results of the above testing and observations, we conclude that the recommendations included in the approved soils engineering report remain applicable. Foundation recommendations previously offered In Reference 5 and 6 remain applicable. Recommendations Any additional grading or construction on the site should be done in accordance with the currently applicable codes and standards. Recommendations should be sought from the Geotechnicai Engineer prior to additional grading. LIMITATIONS Cuts, fills, and processing of original ground under the purview of this report, have been completed under the observation of, and with selective testing by CeoTek, Inc. and are found to be In compliance with the approved soils engineering report and applicable provisions of the Shea Homes Limited Partnership, San Diego November 7, 2012 Report of Geotechnical Testing and Observation Project No. 3389-SD Building Pad 7. CT 04-10 Page 3 current California Building Code (CBC). Our field density testing and observation services during building pad grading followed 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. GeoTek, Inc. accepts neither responsibility nor liability for work, testing, or recommendations performed or provided by others. We appreciate the opportunity to be of service on this project. Please contact the undersigned if you have any questions. Respectfully submitted, GeoTek, Inc. CEG Expires p4730/2014 Principal Geologist Enclosures: References Table I Laboratory Test Results Table 2 Summary of Field Density Test Results Figure I Density Test Location Plan JSz 4V CIO No. 2524 tu Exp. 6-30-13 CC ~4ald Ro MR,E 254 Expires 06/30/2013 Senior Project Engineer I Shea Homes Limited Partnership, San Diego November 7, 2012 I Report of Geotechnical Testing and Observation Project No. 3389-SD Bu1Iing gad 7.CT04d0 References Cited References: U I. Geotechnical Evaluation, Proposed Residential Buildings, SRWB Property, South Side of Cassla Road, East of Poinsettia Lane, Carlsbad, California by GeoTek, Inc. dated April 13, 2004. Grading and Private Storm Drain Plan" for CT 04-10, Poinsettia Place, Carlsbad I California prepared by Pangaea Land Consultants, Inc. Stock Pile Grading Plan: CT 04-10, Poinsettia Place", prepared by Pangaea Land Consultants Inc. undated. I 4. Geotechnical Update and Grading Plan Review, CT 04-10, Poinsettia Place, Poinsettia Lane and Cassia Road, Carlsbad, California 92009 by GeoTek, Inc. dated December 2, 2010. S. "Updated Seismic and Post-Tension Design Parameters, Vitalia, Tract CT 04-10, Carlsbad, California 92009" by GeoTek dated August 29, 2011 revised January 9, 2012. 6. Review of Post tensioned Plans, Vitallia, Tract CT 04-10, Carlsbad, California 92009 by - GeoTek,, Inc. dated March 19, 2012. I I I I I I I Shea Homes Limited Partnership, San Diego November 7, 2012 Report of Geotechnical Testing and Observation Project No. 3389-SD Biilftng Pad 1._CI04L0 Laboratory Testing I TABLE I LABORATORY TEST RESULTS - ASTM D 1557 Soil Description Maximum Dry Density (pcf) Optimum Moisture (% H20) A Light Brown, fine to medium, Silty Sand 121.5 9.5 B Medium Brown fine Silty Sand 117.5 1 12.0 C Tan/light Brown fine Silty Sand 114.0 12.5 D Dark Brown fine to medium Silty Sand 118.5 13.0 Shea Homes Limited Partnership, San Diego I Building Pad 7 CT 04-10, Carlsbad, California 11/8/2012 Project No.: 3389-SD3 Page 1 of I TABLE I SUMMARY OF FIELD DENSITY TESTS GRADING DATE Teat No. Location Eiev! Depth ept Moisture Content Dry Density Soil T Type Maximum Density (pcf) Test T ° Relative Compaction (%) 1/18/11 3 West section BP7 58.1 14.8 114.2 A 121.5 N 94 1/20/12 6 Fill area BP7 60.0 17.7 107.1 A 121.5 N 88 7 Fill area BP 7 60.0 16.8 107.6 A 121.5 N 89 1/27/12 6a Retest Fill Area BP 7 60.0 14.9 111.6 A 121.5 N 92 7a Retest Fill Area BP 7 60.0 13.7 112.5 A 121.5 N 93 24 BP 61.5 11.9 113.6 A 121.5 N 94 12/27/11 27 BP 64.0 12.1 111.9 A 121.5 N 92 28 BP 63.0 13.8 110.4 A 121.5 N 91 104 BP7 Finish Grade 65.6 14.2 113.9 A 121.5 N 94 105 BP 7 Finish Grade 65.6 15.1 111.9 A 121.5 N 92 Note'. N c Nuclear Gauge Test FO = Finished Grade Test BP = Building Pad All elevations are approximate 1 P. LI PAD P1 a P1 --- 4 CRAPIUC SCALE (ei lEST I 1 tact • 01 0 Leaend Density Test Location / Limits of areas under purview this report All Locations are approximate GW.L J HtIGIT PER -. L1(1 Ii Base map from Grading Plans for Poinsettia Place By Pangaea Land Consultants, undated 1384 PoinsettIa Avenue. Suite A Vtt. California 92081-8505 Density Test Location Plan Shea Homes Rough Grading for Building Pad 7, CT 04-10 Carlsbad, California Figure 1 PN: 3389-SD3 November 2012