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HomeMy WebLinkAboutCT 04-10A; POINSETTIA PLACE; REPORT OF GEOTECHNICAL TESTING AND OBSERVATION ROUGH GRADING FOR BUILDING PAD 6; 2012-04-17(71 04 -10P GeoTek, Inc. 1384 Poinsettia Avenue, Suite A Vista, CA 92081.8505 (760) 599-0509 Office (760) 599-0593 Fax www.geotekusa.com April 17, 2012 PN 3389-SD3 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 6 Vitalia Project, Tract 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 6 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 (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 engineered fill was placed by TNT Grading. The engineered fill placed was derived from both on site materials and materials 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 pad are shown on the Density Test Location Plan, Figure I. It should be noted that the area of removals and engineered fill covered in this report is limited to the area indicated on Figure I. CEOTECHNICAL I ENVIRONMENTAL I MATERIALS All material herein © 2012 GeoTek, Inc. All Rights Reserved I I Shea Homes Limited Partnership, San Diego April 17, 2012 Report of Geotechnical Testing and Observation, Vitalia Project, Tract CT 04-10 Project No. 3389-03 Rough Grading for Building Pad 6 Page 2 Field Testing 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. 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 recommendations included in the approved soils engineering report remain applicable. Foundation recommendations previously offered in References 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 I Ii I I Ronald A. Reed, GE 2524 Expires 06/30/2013 Senior Project Engineer Shea Homes Limited Partnership, San Diego April 17, 2012 Report of Geotechnical Testing and Observation, Vitalia Project, Tract CT 04-10 Project No. 3389-SD3 Rough Grading for Building Pad 6 Page 3 during building pad grading followed generally accepted professional engineering practices and no further warranty is implied or 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, A. GeoTek, Inc. No. 1142 J' 1* C EG',a! Expires 0413D/14 Principal Geologist Enclosures: Cited References Table I - Laboratory Test Results Table 2 - Summary of Field Density Tests Figure I - Density Test Location Plan I I Shea Homes Limited Partnership, San Diego April 17, 2012 Report of Geotechnical Testing and Observation, Vitalia Project, Tract CT 04-I0 Project No. 3389-03 Rough Grading for Building Pad 6 References I Cited References: I I. Geotechnical Evaluation, Proposed Residential Buildings, SRWB Property, South Side of I Cassia 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 I Consultants Inc. undated. "Geotechnical Update and Grading Plan Review, CT 04-10, Poinsettia Place, Poinsettia I Lane and Cassia Road, Carlsbad, California 92009" by GeoTek, Inc. dated December 2, 2010. I 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. 6. "Review of Post Tensioned Plans, Vitalia, Tract CT 04-10, Carlsbad, California 92009" I by GeoTek, Inc. dated March 19, 2012. I I I I I 1. I. I. I Maximum Dry Optimum Soil Description Density Moisture (pcf) (% H20) A Light Brown, fine to mcd, Silty Sand 121.5 9.5 B Medium Brown fine Silty Sand 1 117.5 .12.0 I Shea Homes Limited Partnership, San Diego April 17, 2012 Report of Geotechnical Testing and Observation, Vitalia Project, Tract CT 04-10 Project No. 3389-SD3 Rou2h Grading for Building Pad 6 Laboratory Testing I I I TABLE I LABORATORY TEST RESULT ASTM D 1557 Vitalia-Poinsettia Place GeoTek, Inc. April 2012 Carlsbad, Cailfomia Project No.: 3389-SD3 Page 1 of I TABLE 2 SUMMARY OF FIELD DENSITY TESTS GRADING DATE Test No. Location Eiev/ Depth Moisture Content (%) Dry Density (pcf) Soil Type Maximum Density (pcf) Test Type Relative Compaction (%) 1/18/11 1 west section BP 6 255.7 15.9 111.0 A 121.5 N 91 2 west section BP6 254.0 15.6 112.5 A 121.5 N 93 1/19/11 4 west section BP6 257.0 14.2 110.4 A 121.5 N 91 5 west section BP6 258.1 16.8 107.6 A 121.5 N 89 5a west section BP6 258.1 14.9 110.8 A 121.5 N 91 29 BP6 260.0 13.5 113.4 A 121.5 N 93 30 BP6 261.0 13.6 112.0 A 121.5 N 92 31 BP6 263.0 13.7 113.9 A 121.5 N 94 12/19/11 33 BP6 254.0 10.3 110.9 A 121.5 N 91 34 BP6 256.0 11.2 114.2 A 121.5 N 94 35 BP6 258.0 12.1 112.1 A 121.5 N 92 70 BP6 258.0 13.0 102.7 B 117.0 N 88 70a BP6 236.5 15.4 104.8 B 117.0 N 90 106 BP 6 Finish Grade 263.0 15.2 111.7 A 121.5 N 92 109 BP6 263.0 12.9 114.9 A 121.5 N 95 LI Note: BP= Builing Pad N = Nuclear Gauge Test FG = Finished Grade Test All elevations are approximate - - - - - - - - - - - 4 GRAPHIC SCALE I tth • 59 (I. Geotechnical Legend © Density Test Location / Limits of Areas Under Purview this Report All locations and limits are approximate. Base map from Grading Plans for Poinsettia Place' by Pangaea Land Consultants, undated. PN: 3389-SD3 1384 Polnsetda Avenue. SufteA Vista, California 920814L505 2012 Density Test Shea Homes Limited Partnership, San Diego Location Plan Rough Grading for Building Pad 6, Vitalia Project, Tract CT 04-10 Carlsbad, California Figure 1