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HomeMy WebLinkAboutCT 04-10A; POINSETTIA PLACE; REPORT OF GEOTECHNICAL TESTING AND OBSERVATION ROUGH GRADING FOR BUILDING PAD 4; 2013-07-31U cco'4 •tc?) I GeoTek, Inc. 1384 Poinsettia Avenue, Suite A Vista, CA 92081-8505 (760) 599-0509 Office (760) 599-0593 Fax www.geotekusa.com 1 I Shea Homes Limited Partnership, San Diego 1 9990 Mesa Rim Road San Diego, California 92121 Attention: Ms. Sarah Morrel July 31, 2013 PN 3389-SD3 Subject: Report of Geotechnical Testing and Observation Rough Grading for Building Pad 4 CT 04-10 Carlsbad, California 92009 Dear Ms. Morrel, 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 4 on Tract CT 04-10, Carlsbad, California. Construction Summary This report is limited to grading of the subject building pad. Recent grading was performed in late, 2011 and early 2012 by TNT Grading. Grading consisted of removing approximately three (3) feet of the pre-existing fill, scarifying the resultant ground surface followed by additional fill placement. 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 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 Figure I. GEOTECHNICAL I ENVIRONMENTAL I MATERIALS All material herein © 2013 GeoTek, Inc. All Rights Reserved Shea Homes Limited Partnership, San Diego July 31, 2013 Report of Geotechnical Testing and Observation Project No. 3389-SD3 I Building Pad 7. CT 04-10 Page 2 I 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: i , * Field density tests were taken at periodic intervals and random locations to check the compaction efforts by the contractor. I . 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 I moisture content applied to each field density test. Laboratory Testing I 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 I content for soil types tested were determined in general accordance with test method ASTM D 1557. 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 construction and future maintenance is performed in accordance with the recommendations presented herein and in the reference reports. I Based on the results of the above testing and observations, we conclude that the recommendations included in the approved soils engineering report remain applicable. I Foundation recommendations previously offered in Reference 5 and 6 remain applicable. I 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 I Geotechnical Engineer prior to additional grading. I LIMITATIONS I 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 I I Shea'Homes Limited Partnership, San Diego : July 31, 2013 Report of Geotechn,ical Testing and Observation : :: Project No. 3389-SD3' Building Pad 7, CTO4-I0 : : 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 I: 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:0r provided by others. We appreciate the opportunity to be of service on :this project. Please contact the undersigned I if you have any questions Respectfully submitted, ?y,0FES$/0Vk Geo'Tek, Inc. cc I I.. Ti E calfe, CEG 1142 ' Ronald A. Reed, GE 2524 Expire /30/14 :• : :' Expires 06/30/20.15 Principal Geologist: . :: ' Senior Project Engineer Enclosures: . .. . .. . . .. I ' References : •' :' : ,: 2 Table I . Laboratory Test Results:: Table 2 Summary of Field Density Test Results . '. Figure I ' Density Test Location Plan , I ..... .'.. . Shea Homes Limited Partnership, San Diego July 31, 2013 Report of Geotechnical Testing and Observation Project No. 3389-SD3 Building Pad 4. CT 04-10 References Cited References: 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. 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 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, 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 Shea Homes Limited Partnership, San Diego July 31, 2013 Report of Geotechnical Testing and Observation Project No. 3389-SD3 Building Pad 4. CT 04-10 Laboratory Testing TABLE I LABORATORY TEST RESULTS - ASTM D 1557 Soil Description Maximum Dry Density (pcf) Optimum Moisture (% H2O) A Light Brown, fine to medium, Silty Sand 121.5 9.5 B Medium Brown fine Silty Sand 117.5 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 E Green Brown Silty Clay 104.0 17.5 I - GeoTek, Inc. Shea Homes July 31, 2013 Vitalia Project No.: 3389-SD3 I Carlsbad, California Page 1 of 1 TABLE 2 SUMMARY OF FIELD DENSITY RESULTS GRADING DATE Test .o. Location Elev/ D h Depth Content (%) Dry Density (pcf) Soil T Type Maximum Density (pcf) Test T Type Relative Compaction (%) 12/21/11 42 BP4 265.0 13.5 106.2 C 114.0 N 93 12/21/11 44 BP4 246.0 15.3 107.2 C 114.0 N 94 12/21/11 45 BP4 248.0 13.8 104.7 C 114.0 N 92 12/21/11 46 BP4 250.0 12.9 107.2 C 114.0 N 94 12/21/11 47 BP4 250.0 14.3 105.0 C 114.0 N 93 12/27/11 71 BP4 235.0 12.3 107.1 C 114.0 N 94 12/28/11 74 BP4 246.0 17.8 105.6 C 114.0 N 93 12/28/11 79 BP4 250.0 16.3 105.2 C 114.0 N 92 12/28/11 80 BP4 251.0 18.7 99.3 E 104.0 N 95 1/5/12 113 BP4 FG 253.5 15.1 110.3 B 117.5 N 94 1/5/12 114 6P4 FG 253.5 13.6 111.6 B 117.5 N 95 Note: N = Nuclear Gauge Test FG = Finished Grade Test All elevations are approximate — — — — — — — — — — — — _ — — — -- — GRAPHIC SCALE (III F20T) I tIh - 20 It. ) : 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 1384 Poinsettia Avenue, Suite A Vista, California 92081.8505 PN: 3389-S03 11 July 2013 Density Test Location Plan Shea Homes Rough Grading for Building Pad 4, CT 04-10 Carlsbad, California Figure 1