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HomeMy WebLinkAboutCT 04-10A; POINSETTIA PLACE; REPORT OF GEOTECHNCIAL TESTING AND OBSERVATION ROUGH GRADING FOR BUILDING PADS 8, 9, AND GARAGE PAD; 2012-04-16I c,1 04-lOt Geolbk, Inc. 1384 Poinsettia Avenue, Suite A Vista, CA 92081.8505 (760) 599.0509 Office (760) 599-0593 Fax www.geotekusa.com I Shea Homes Limited Partnership, San Diego 1 9990 Mesa Rim Road San Diego, California 92121 Attention: Ms. Sarah Beckman April 16, 2012 PN 3389-SD Subject: Report of Geotechnical Testing and Observation Rough Grading for Building Pads 8 and 9 and Garage Pad 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 Pads 8 and 9 and the garage pad on Tract CT 04-10, Carlsbad, California. Construction Summary This report is limited to grading of the subject building pads. Recent grading occurred in two different time periods and was performed by two contractors. In early 2011 approximately three 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. 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 pads are shown on Figure I. It should be noted that the area of removals and engineered fill under purview of this report is limited to those indicated on Plate I. Field Testing Our field density testing was performed in accordance with ASTM Test Method D6983. Our field density testing program was conducted as follows: GEOTECHNICAL J ENVIRONMENTAL I MATERIALS All material herein © 2012 Geolek, Inc. All Rights Reserved Shea Homes Limited Partnership, San Diego April 16, 2012 Report of Geotechnical Testing and Observation Project No. 3389-SD3 CT 04-10 Page 2 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 D 1557. Laboratory test results are presented in Table I. Conclusions It is our professional opinion that the site is suitable for the intended use provided that site 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 I 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 Geotechnical 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 GeoTek, Inc. and are found to be in compliance with the approved soils engineering report and applicable provisions of the 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. Shea Homes Limited Partnership, San Diego April 16, 2012 Report of Geotechnical Testing and Observation Project No. 3389-SD3 CT 04-10 Page 3 We appreciate the opportunity to be of service on this project. Please contact the undersigned if you have any questions. Respectfully submitted, A. GeoTek, Inc. (( No.1142 J Exp. L ~P'-' CAt; Ti C EG1142 Expires O4/3OIl4 Principal Geologist Enclosures: Cited References Table I A Laboratory Test Results Table 2: Summary of Field Density Test Results Figure I: Density Test Location Plan Ronald A. Reed, GE 2524 Expires 06/30/2013 Senior Project Engineer IN I I Shea Homes Limited Partnership, San Diego April 16, 2012 Report of Geotechnical Testing and Observation Project No. 3389-SD3 CT 04-10 References Cited References: I I. Geotechnical Evaluation, Proposed Residential Buildings, SRWB Property, South Side of Cassia Road, East of Poinsettia Lane, Carlsbad, California by GeoTek, Inc. dated April 13, 2004 I 2. Grading and Private Storm Drain Plan" for CT 04-10, Poinsettia Place, Carlsbad California prepared by Pangaea Land Consultants, Inc. Stock Pile Grading Plan: CT 04-10, Poinsettia Place", prepared by Pangaea Land I Consultants Inc. undated 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, I 2010 5. "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 I 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 - S I I I TABLE I (TEST RESULT ASTM D 1557 Maximum Dry Density (pcf) Optimum Moisture (% H20) Ity Sand 121.5 9.5 117.5 12.0 rid 114.0 12.5 Silty Sand 118.5 13 I I I Shea Homes Limited Partnership, San Diego Report of Geotechnical Testing and Observation CT 04-10 April 16, 2012 Project No. 3389-SD Laboratory Testing GRAPHIC SCALE (m nan Legend Density Test Location ,. Limits of areas under / purview this report All Locations are approximate Base map from Grading Plans for Poinsettia Place By Pangaea Land Consultants, undated 384 Poinsettia Avenue, Suite A Vista. California 92081-MS Density Test Location Plan Shea Homes Rough Grading for Building Pads 8 and 9 and Garage Pad. CT 04-10 Carlsbad, California Figure 1 PN: 3389-SD3 2012