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HomeMy WebLinkAboutCDP 16-26; TABATA RANCH SAIKI RESIDENCE LOT 4; FINAL AS-GRADED REPORT - SUMMARY FOR TESTING OF COMPACTED FILL; 2020-04-21 April 21, 2020 CTE Project No. 10-13292G Tabata Family Trust C/O: WNC General Contractors, Inc. Attention: Mr. Bruce Wiegand 5411 Avenida Encinas, Suite 255 Carlsbad, CA 92008 Telephone: (760)803-2427 Via Email: bruce@wncommunities.com Subject: Final As-Graded Report - Summary for Testing of Compacted Fill Saiki Residence Lot 4-Tabata Ranch (PC2017-0043) 6764 Strawberry Place Carlsbad, California Reference: At End of Document Mr. Wiegand: As requested, Construction Testing & Engineering, Inc. (CTE) has performed observation and testing of compacted materials during recent earthwork at the referenced site. This letter is provided as certification that recent remedial site preparation was performed in accordance with the referenced update recommendation letter. Based on review of the referenced as-graded report, the previous fill placement was also conducted in general conformance with the recommendations specified in the approved project soils report. Field-testing of the compacted material in the referenced building pad and fill slope areas was also performed in accordance with ASTM D-6938-08a (nuclear method). Results of the field- testing indicate that fill materials were compacted to a minimum of 90 of the laboratory maximum dry density as determined by test method ASTM D-1557. Tabulated results of the field compaction testing performed are provided in the attached Table I, “Compaction Test Summary”. The laboratory maximum density results are provided in Table II, “Laboratory Test Results.” Based on the observations and testing performed, the referenced building pads are considered suitable for support of the proposed improvements. Any additional grading should be observed and confirmed by CTE. Construction Testing & Engineering, Inc. Inspection I Testing I Geotechnical I Environmental & Construction Engineering I Civil Engineering I Surveying 1441 Montiel Road, Suite 115 I Escondido, CA 92026 I Ph (760) 746-4955 I Fax (760) 746-9806 I www.cte-inc.net Final As-Graded Report - Summary for Testing of Compacted Fill and Page 2 Saiki Residence Lot 4-Tabata Ranch (PC2017-0043) 6764 Strawberry Place, Carlsbad, California April 21, 2020 CTE Job No. 10-13292G S:\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Lot 4\Ltr_Lot 4 Bldg Pad Comp (revised 4-21- 2020).doc This document is subject to the same limitations as the referenced geotechnical documents. The opportunity to be of service is appreciated. If you have any questions, please do not hesitate to contact this office. Respectfully submitted, CONSTRUCTION TESTING & ENGINEERING, INC. Rodney J. Jones, RCE #84232 Project Engineer Attachments: Figure 1 – Compaction Test Location Map Table I - Compaction Test Summary Table II - Laboratory Test Results Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California CTE Job No. 10-13292G, dated July 6, 2015, Modified November 7, 2018 Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California CTE Job No. 10-13292G, dated October 27, 2017 Final As-Graded Report - Summary for Testing of Compacted Fill and Page 3 Saiki Residence Lot 4-Tabata Ranch (PC2017-0043) 6764 Strawberry Place, Carlsbad, California April 21, 2020 CTE Job No. 10-13292G S:\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Lot 4\Ltr_Lot 4 Bldg Pad Comp (revised 4-21- 2020).doc References: Update Geotechnical Recommendations for Proposed Tabata Ranch Subdivision Lot-4 Lemon Leaf Drive, Carlsbad California CTE Job No. 10-13292G, dated August 26, 2016 (revised March 5, 2018) Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California CTE Job No. 10-13292G, dated October 27, 2017 Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California CTE Job No. 10-13292G, dated July 6, 2015, Modified November 7, 2018 Geotechnical and Update Report and Grading Plan Review Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California Vinje & Middleton Engineering Job # 01-364-P, dated August 2, 2006 Preliminary Geotechnical Investigation Proposed 4-Lot Subdivision, Tabata Ranch Off Camino De Las Ondas and Lonicera Street, Carlsbad, California Vinje & Middleton Engineering Job # 01-364-P, dated October 24, 2001 TABLE I COMPACTION TEST SUMMARY Job Name: Tabata Ranch Job No. 10-13292G Job Address: Lemon Leaf Drive, Carlsbad Ca Date: 9/6/2018 Date Test Location Elevation Density Moisture Relative Soil No. or Depth pcf Content Compaction Type Feet % Dry % Weight 5/31/2018 1 Center/Finish Grade Pad FG 118.2 12.4 95% 1 5/31/2018 2 NE/Finish Grade Pad FG 115.9 12.7 93% 1 5/31/2018 3 NW/Finsh Grade Pad FG 113.5 12.2 91% 1 5/31/2018 4 West/Finish Grade Pad FG 113.1 12.4 91% 1 5/31/2018 5 East/Finish Grade Pad FG 112.7 12.8 91% 1 ** TEST FAILED, SEE RETEST 1 TABLE II LABORATORY TEST DATA Job Name: Tabata Ranch Job No. 10-13292G Job Address: Lemon Leaf Drive, Carlsbad Ca Date 9/6/2018 Maximum Optimum Sample No.Dry Density Moisture Soil pcf Content Description %wt 1 124.3 10.0 2 I I INTERIM AS-GRADED GEOTECHNICAL REPORT PROPOSED TABATA RANCH SUBDIVISION LEMON LEAF DRIVE CARLSBAD, CALIFORNIA PREPARED FOR: TABATA FAMILY TRUST C/O: GREGG HARRINGTON P.O. BOX 943 CARLSBAD, CALIFORNIA PREPARED BY: CONSTRUCTION TESTING & ENGINEERING, INC. 1441 MONTIEL ROAD, SUITE 115 ESCONDIDO, CALIFORNIA 92026 CTE PROJECT NO. 10-13292G JULY 6, 2015, MODIFIED NOVEMBER 7, 2018 Construction Testing & Engineering, Inc. Inspection I Testing I Geotechnical I Environmental & Construction Engineering I Civil Engineering I Surveying 1441 Montiel Road, Suite 115 I Escondido, CA92026 I Ph (760) 746-4955 I Fax (760) 746-9806 I www.cte-inc.net \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc TABLE OF CONTENTS SECTION PAGE 1.0 BACKGROUND .......................................................................................................................1  2.0 PROJECT INFORMATION ......................................................................................................2  3.0 FILL PLACEMENT ..................................................................................................................3  4.0 TESTING ...................................................................................................................................3  5.0 ADDITIONAL CONSTRUCTION OBSERVATION ..............................................................4  6.0 CONCLUSIONS AND RECOMMENDATIONS ....................................................................4  7.0 LIMITATIONS ..........................................................................................................................5  TABLES TABLE I COMPACTION TEST SUMMARY TABLE II LABORATORY TEST DATA FIGURES FIGURE 1 SITE INDEX MAP FIGURE 2 COMPACTION TEST LOCATION MAP Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 1 1.0 BACKGROUND This document provides information regarding testing of compacted fill for the grading operations completed in 2014 to date at the proposed Tabata Ranch Subdivision located on Strawberry Place in Carlsbad, California. Our work was authorized through CTE proposal no. G-3871, dated August 23, 2016. Part of the site was previously graded (Lots 1 and 2) based on the preliminary geotechnical investigation performed by Vinje & Middleton Engineering, Inc. (Job No. 01-364-P) dated August 2, 2006. Grading procedures and testing of compacted fill for these lots was conducted by Vinje & Middleton Engineering, Inc. personnel. CTE reviewed field grading observation reports from the testing and observations of these lots, in addition to performing surface testing on these two lots, with adequate compaction test results. CTE also reviewed the previously prepared geotechnical report and was in general agreement with the data, conclusions, and recommendations. Based on the previously performed limited investigation, the site had Quaternary Previously Placed Fill soils overlying sedimentary bedrock units of the Eocene Age. Fill soils were generally found to a maximum depth of 5.5 feet below existing grades. The attached Figure 1 shows the approximate location of the site and surrounding area. Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 2 2.0 PROJECT INFORMATION This report includes a summary of test results and observations performed by CTE during the (2014) placement of compacted fill for the proposed building pads and associated improvements. Subsequent building pad remediation was also recently performed in accordance with the referenced update geotechnical recommendations (2016) Conditions encountered at the site were found to consist of previously placed fill and residual soils overlying sedimentary bedrock. Previously placed fill and other disturbed near surface soils were generally found to consist of loose, silty sand. These materials were removed beneath improvement areas prior to placement of compacted fill as part of the recent grading operations. As indicated, loose and disturbed surface soils and previously placed fill were excavated to between elevations 253 feet above mean seal level (msl) and 272 msl, depending on location. The exposed bottoms of excavations were observed, tested, and confirmed (as appropriate) prior to placement of the compacted fill. Exposed areas to receive fill were then scarified, moisture conditioned, and compacted in general accordance with project requirements. Following subgrade preparation, fill materials were moisture conditioned, placed in thin uniform lifts, and then compacted. Excavations and compaction within the improvement areas were conducted with a D8 bulldozer and a 980 rubber-tired front loader. Mountain Movers was the grading contractor for the project. Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 3 Additional grading throughout the subject site consisted of parking and drive areas, minor excavations, wall backfill, and utility installation. Minor grading and compaction testing for utility tie-ins conducted in the adjacent Lonicera Street right-of-way is also documented herein. 3.0 FILL PLACEMENT Fill soils consisting of onsite stock piled materials were generally placed in uniformly compacted lifts at above optimum moisture content. Compaction was performed to the appropriate minimum values (90% for building pad areas and 95% for pavement subgrade areas), as determined by ASTM D1557. Grading was performed using standard construction equipment, followed by mixing, moisture conditioning, and compaction procedures. Backfill placement and compaction were performed in overall conformance with the project geotechnical recommendations. 4.0 TESTING Testing was performed to supplement field observations. Testing of compacted fill addressed by this report was conducted, as scheduled by the contractor, between July 1, 2014 and May 31, 2018. Field-testing of the compacted fill soil was conducted in accordance with ASTM D-6938-08a (nuclear method). Results of the field-testing indicate that fill materials were compacted to at least 90 percent or 95 percent (depending on location) of the laboratory maximum dry density, as required, in accordance with ASTM D 1557. Fill material was generally compacted at above optimum moisture content. Tabulated results of the field compaction testing are provided in the attached Table I, “Compaction Test Summary.” Laboratory determination of the reference compaction values for the fill materials Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 4 is provided in Table II, “Laboratory Test Results.” Figure 2 shows the approximate location of the compaction tests performed, as well as other pertinent as-graded information. Based on site observations and laboratory testing, it appears the expansion potential for onsite materials is generally very low (Expansion Index < 20). 5.0 ADDITIONAL CONSTRUCTION OBSERVATION CTE observed subsurface water seepage along the dense formation contact during the overexcavation of the lower building pad (proposed elevation 276.0 feet) of Lot 3. Based on our observations and discussions, the installation of a subdrain, which consisted of a typical minimum four-inch diameter perforated pipe, surrounded by 3/4-inch rock/gravel, and surrounded by filter fabric, was installed and connected to the south end of the adjacent retaining wall backdrain. The subdrain extended along the entire Lot 3 toe of slope that connects the upper and lower building pads. Additional grading and backfilling, if any, should be observed and tested by CTE. In addition, prior to any significant future development, an appropriate update geotechnical investigation and report should be completed. 6.0 CONCLUSIONS AND RECOMMENDATIONS CTE concludes that the soil engineering and engineering geologic aspects of the grading covered by this report are in compliance with the approved geotechnical report and the grading plans (City of Carlsbad Drawing No. 471-9A, Assessors Parcel Numbers APN: 214-631-20 & 214-630-20). Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 5 However, we understand that the site structures are not proposed for construction at this time. Therefore, prior to commencing with future construction, CTE should review the final proposed structural locations and details in order to provide update recommendation for building pad overexcavations, as appropriate. Due to the passing of time since building pad preparations, at a minimum, surficial remediation should be anticipated prior to recommencing building construction. Any vegetation, debris, or any other loose or dry material should be removed and replaced by compacted backfill to the required subgrade elevations, as necessary. As such, we anticipate (at a minimum) it will be appropriate to remove any vegetation and then scarify, moisture condition, and recompact the top six to 12 inches of building pad subgrade soils. However, CTE should confirm the adequacy of the building pad and surrounding areas during construction. CTE should also observe and confirm all footing excavations, as they are performed, in order to confirm adequate conditions. 7.0 LIMITATIONS As limited by the scope of the services that CTE agreed to perform, opinions presented herein are based on observations, test results, and understanding of the proposed site development. CTE’s service was performed according to the currently accepted standard of practice by reputable consultants. No warranty, express or implied, is given or intended with respect to the performance of the project in any respect. Submittal of this report should not be construed as relieving the grading contractor of his responsibility to comply with the project requirements. Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 6 The opportunity to be of service is appreciated. If you have any questions regarding testing conducted, observations made during construction or recommendations presented herein, please do not hesitate to contact this office. Respectfully submitted, CONSTRUCTION TESTING & ENGINEERING, INC. Dan T. Math, GE #2665 Rodney J. Jones, RCE #84232 Principal Engineer Project Engineer RJJ/DTM:nri Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California July 6, 2015, Modified November 7, 2018 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report Interim Entire Site\Rpt_Interm Comp 10-13292 [11-07-2018].doc Page 7 References: Update Geotechnical Recommendations for Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California CTE Job No. 10-13292G, dated August 26, 2016 Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California CTE Job No. 10-13292G, dated July 6, 2015, Modified November 7, 2018 Geotechnical and Update Report and Grading Plan Review Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California Vinje & Middleton Engineering Job # 01-364-P, dated August 2, 2006 Preliminary Geotechnical Investigation Proposed 4-Lot Subdivision, Tabata Ranch Off Camino De Las Ondas and Lonicera Street, Carlsbad, California Vinje & Middleton Engineering Job # 01-364-P, dated October 24, 2001 TABLE I COMPACTION TEST SUMMARY Job Name: Tabata Ranch Job No. 10-12101G Job Address: Lemon Leaf Drive, Carlsbad Date: 11/14/2015 Date Test Location Elevation Density Moisture Relative Soil No. or Depth pcf Content Compaction Type Feet % Dry % Weight 7/1/2014 1 Strawberry Place/Street 254.0 114.8 9.8 91% 1 7/1/2014 2 Strawberry Place/Street 256.0 115.2 10.3 92% 1 7/1/2014 3 Strawberry Place/Street 256.0 114.1 10.5 91% 1 7/1/2014 4 Strawberry Place/Street 258.0 113.7 10.9 90% 1 7/1/2014 5 Strawberry Place/Street 260.0 112.5 11.9 91% 2 7/1/2014 6 Strawberry Place/Street 260.0 114.0 12.3 92% 2 7/2/2014 7 Strawberry Place/Street 258.0 114.7 12.8 92% 2 7/2/2014 8 Strawberry Place/Street 262.0 113.3 12.6 91% 2 7/2/2014 9 Strawberry Place/Street 262.0 115.1 12.2 93% 2 7/2/2014 10 Strawberry Place/Street 264.0 115.9 11.4 93% 2 7/2/2014 11 Strawberry Place/Street 264.0 113.8 11.8 92% 2 7/2/2014 12 Strawberry Place/Street 263.0 116.4 12.7 94% 2 7/2/2014 13 Strawberry Place/Street 265.0 114.5 12.0 92% 2 7/2/2014 14 Strawberry Place/Street 265.0 115.0 12.3 93% 2 7/2/2014 15 Strawberry Place/Street 263.0 113.9 11.1 92% 2 7/2/2014 16 Strawberry Place/Street 267.0 113.8 11.5 92% 2 7/2/2014 17 Strawberry Place/Street 267.0 116.0 12.4 93% 2 7/2/2014 18 Strawberry Place/Street 265.0 115.7 12.0 93% 2 7/3/2014 19 Strawberry Place/Street 269.0 114.2 12.4 92% 2 7/3/2014 20 Strawberry Place/Street 269.0 113.7 11.6 91% 2 7/3/2014 21 Strawberry Place/Street 264.0 119.0 11.8 96% 2 7/3/2014 22 Strawberry Place/Street 266.0 117.0 12.6 94% 2 7/7/2014 23 Strawberry Place/Street 266.0 116.3 12.2 94% 2 7/7/2014 24 Strawberry Place/Street 266.0 115.5 12.0 93% 2 7/7/2014 25 Strawberry Place/Street 268.0 118.2 11.7 95% 2 7/7/2014 26 Strawberry Place/Street 268.0 118.5 12.0 95% 2 7/7/2014 27 Strawberry Place/Street 270.0 116.6 12.4 94% 2 7/7/2014 28 Strawberry Place/Street 270.0 115.9 13.3 93% 2 7/8/2014 29 Lot 5 Fill Slope 265.0 110.0 15.1 95% 3 7/8/2014 30 Lot 5 Fill Slope 267.0 111.2 15.7 97% 3 7/8/2014 31 Lot 5 Fill Slope 267.0 111.6 14.9 97% 3 7/8/2014 32 Lot 5 Fill Slope 269.0 110.3 15.9 96% 3 7/8/2014 33 Lot 5 Fill Slope 269.0 109.4 13.6 95% 3 7/8/2014 34 Lot 5 Fill Slope 271.0 105.7 13.5 92% 3 7/8/2014 35 Lot 5 Fill Slope 271.0 108.0 14.4 94% 3 7/8/2014 36 Lot 5 Fill Slope 271.0 109.1 14.0 95% 3 7/8/2014 37 Strawberry Place/Street 271.0 108.6 14.5 94% 3 7/8/2014 38 Strawberry Place/Street 271.0 110.7 15.2 96% 3 7/9/2014 39 Lot 4 273.0 113.4 13.5 98% 3 7/9/2014 40 Lot 4 273.0 110.1 13.8 96% 3 7/9/2014 41 Lot 4 273.0 112.4 13.6 98% 3 7/9/2014 42 Lot 4 274.0 110.3 12.9 96% 3 7/9/2014 43 Lot 4 274.0 109.3 13.2 95% 3 7/9/2014 44 Lot 4 274.0 111.8 13.7 97% 3 7/9/2014 45 Lot 5 273.0 112.0 14.2 97% 3 7/9/2014 46 Lot 5 273.0 109.5 14.8 95% 3 7/10/2014 47 Lot 3/Upper Pad 284.0 105.3 15.1 91% 3 ** TEST FAILED, SEE RETEST 1 TABLE I COMPACTION TEST SUMMARY Job Name: Tabata Ranch Job No. 10-12101G Job Address: Lemon Leaf Drive, Carlsbad Date: 11/14/2015 Date Test Location Elevation Density Moisture Relative Soil No. or Depth pcf Content Compaction Type Feet % Dry % Weight 7/10/2014 48 Lot 3/Upper Pad 285.0 106.6 15.3 93% 3 7/10/2014 49 Lot 3/Upper Pad 284.0 107.0 15.0 93% 3 7/10/2014 50 Lot 3/Upper Pad 285.0 105.1 15.5 91% 3 7/10/2014 51 Lot 5 273.0 108.4 14.2 94% 3 7/10/2014 52 Lot 5 273.0 111.3 14.0 97% 3 7/10/2014 53 Lot 5 273.0 112.0 14.6 97% 3 7/11/2014 54 Lot 5 274.0 111.7 14.8 97% 3 7/11/2014 55 Lot 5 274.0 111.1 15.0 96% 3 7/11/2014 56 Lot 5 274.0 110.8 14.4 96% 3 7/14/2014 57 Lot 3/Lower Pad 273.0 107.5 12.9 93% 3 7/14/2014 58 Lot 3/Lower Pad 274.0 107.7 13.5 93% 3 7/14/2014 59 Lot 3/Lower Pad 275.0 109.0 14.9 95% 3 7/14/2014 60 Lot 3/Upper Pad FSG 105.5 15.3 92% 3 7/14/2014 61 Lot 3/Upper Pad FSG 106.1 15.6 92% 3 7/15/2014 62 Lot 5 FSG 113.0 14.4 98% 3 7/15/2014 63 Lot 5 FSG 112.2 14.0 97% 3 7/15/2014 64 Lot 5 FSG 111.5 13.9 97% 3 7/15/2014 65 Lot 4 FSG 109.8 13.1 95% 3 7/15/2014 66 Lot 4 FSG 112.0 13.6 97% 3 7/15/2014 67 Lot 4 FSG 110.3 13.7 96% 3 7/16/2014 68 Lot 1 FSG 120.6 5.4 97% 2 7/16/2014 69 Lot 1 FSG 119.9 6.0 96% 2 7/16/2014 70 Lot 2 FSG 122.8 6.7 99% 2 7/16/2014 71 Lot 2 FSG 121.0 6.9 97% 2 7/17/2014 72 Rebuild Fill Slope at Lot 3 Wall 286.0 109.2 12.5 95% 3 7/17/2014 73 Rebuild Fill Slope at Lot 3 Wall 287.0 109.5 13.8 95% 3 7/17/2014 74 Rebuild Fill Slope at Lot 3 Wall 288.0 109.9 14.0 95% 3 7/17/2014 75 Rebuild Fill Slope at Lot 3 Wall 288.0 110.6 14.2 96% 3 9/4/2014 76 Retaining Wall East of Strawberry Place 276.0 106.3 12.8 92% 3 9/4/2014 77 Retaining Wall East of Strawberry Place 275.0 103.9 13.4 90% 3 9/4/2014 78 Retaining Wall East of Strawberry Place 273.0 105.6 12.9 92% 3 9/4/2014 79 Retaining Wall East of Strawberry Place 272.0 105.1 13.8 91% 3 9/4/2014 80 Retaining Wall East of Strawberry Place 270.0 104.5 13.6 91% 3 9/4/2014 81 Retaining Wall East of Strawberry Place 269.0 111.9 12.1 90% 2 9/4/2014 82 Retaining Wall East of Strawberry Place 262.0 113.5 10.9 91% 2 9/4/2014 83 Retaining Wall East of Strawberry Place 277.5 112.9 11.7 91% 2 9/4/2014 84 Retaining Wall East of Strawberry Place 273.0 103.8 13.3 90% 3 9/4/2014 85 Retaining Wall East of Strawberry Place 268.0 108.3 13.7 94% 3 9/4/2014 86 Retaining Wall East of Strawberry Place 264.5 107.5 14.4 93% 3 9/5/2014 87 Retaining Wall South of Strawberry Place 250.0 105.7 14.1 92% 3 9/5/2014 88 Retaining Wall South of Strawberry Place 251.0 104.4 13.9 91% 3 9/5/2014 89 Retaining Wall South of Strawberry Place 252.0 106.9 14.6 93% 3 9/5/2014 90 Retaining Wall South of Strawberry Place 253.0 104.1 12.5 90% 3 9/5/2014 91 Retaining Wall South of Strawberry Place 254.0 105.4 13.8 91% 3 -92 Not Used - - - N/A - -93 Not Used - - - N/A - 10/10/2014 94 Back Horseshhoe Shape Wall 2' Below Top of Wall 272.0 105.1 13.2 91% 3 ** TEST FAILED, SEE RETEST 2 TABLE I COMPACTION TEST SUMMARY Job Name: Tabata Ranch Job No. 10-12101G Job Address: Lemon Leaf Drive, Carlsbad Date: 11/14/2015 Date Test Location Elevation Density Moisture Relative Soil No. or Depth pcf Content Compaction Type Feet % Dry % Weight 10/10/2014 95 Back Horseshhoe Shape Wall 2' Below Top of Wall 270.0 104.8 12.9 91% 3 10/10/2014 96 Back Horseshhoe Shape Wall 2' Below Top of Wall 267.0 104.4 13.4 91% 3 10/10/2014 97 Back Horseshhoe Shape Wall 2' Below Top of Wall 262.0 105.7 10.5 92% 3 10/10/2014 98 Back Horseshhoe Shape Wall 2' Below Top of Wall 272.0 107.9 10.9 94% 3 10/10/2014 99 Back Horseshhoe Shape Wall 2' Below Top of Wall 270.0 107.6 11.3 93% 3 7/28/2014 100 Lower Half of Slope (Sewer) -2.0 108.2 14.9 94% 3 7/28/2014 101 Lower Half of Slope (Sewer) -1.0 106.0 15.3 92% 3 7/29/2014 102 Lower Half of Slope (N. Sewer) -1.0 106.3 14.5 92% 3 7/29/2014 103 Lower Half of Slope (N. Sewer) -2.0 105.2 15.2 91% 3 10/23/2014 104 SD1-storm drain on Lonicera St 244.0 110.6 14.1 96% 3 10/23/2014 105 SD2-storm drain on Lonicera St SG 107.6 15.8 93% 3 10/27/2014 106 Storm Drain Manhole -2.0 110.2 14.6 96% 3 10/27/2014 107 Storm Drain Manhole FSG 112.3 15.1 97% 3 10/29/2014 108 Storm Drain Tie-In SG 111.2 13.1 97% 3 10/31/2014 109 Sewer Tie-in SG 114.4 13.3 99% 3 11/10/2104 110 8-inch Sewer Line 250.0 109.6 12.7 95% 3 11/10/2104 111 8-inch Sewer Line 252.0 112.7 12.7 98% 3 11/10/2104 112 8-inch Sewer Line 253.0 110.4 13.1 96% 3 11/10/2104 113 8-inch Sewer Line 254.0 109.8 12.9 95% 3 7/27/2015 114 Lonicera Drive SG 110.0 14.7 95% 3 7/27/2015 115 Lonicera Drive SG 112.8 14.5 98% 3 10/19/2016 116 S.E Side Lonicera St AC 139.6 - 96% 4 10/19/2016 117 N.E Side Lonicera St AC 138.8 - 96% 4 10/19/2016 118 N.E Side Lonicera St AC 139.3 - 96% 4 10/19/2016 119 S.W Side Lonicera St AC 137.8 - 95% 4 10/19/2016 120 CTR Westside Lonicera St AC 139.9 - 96% 4 10/19/2016 121 N.W Side Lonicera St AC 139.2 - 96% 4 10/19/2016 122 N.E Side Lonicera St AC 138.4 - 95% 4 10/27/2016 123 Lot #1 Pad SG 118.9 10.4 94% 1 10/27/2016 124 Lot #1 Pad SG 115.5 10.7 92% 1 10/27/2016 125 Lot #2 Pad SG 118.4 10.4 94% 1 10/27/2016 126 Lot #2 Pad SG 117.7 10.3 93% 1 1/31/2017 127 Lot #5 SG 109.1 13.1 95% 3 1/31/2017 128 Lot #5 SG 110.7 13.3 96% 3 1/31/2017 129 Lot #5 SG 109.8 13.3 95% 3 5/10/2017 130 Building Pad #3 FG 110.6 12.7 96% 3 5/10/2017 131 Building Pad #3 FG 111.3 12.5 97% 3 10/26/2017 132 1st Level Retaining Wall Lot 3, NW SG 106.3 13.8 92% 3 10/26/2017 133 1st Level Retaining Wall Lot 3, N SG 104.9 14.3 91% 3 10/26/2017 134 1st Level Retaining Wall Lot 3, NE SG 104.5 14.0 91% 3 10/26/2017 135 1st Level Retaining Wall Lot 3, E SG 104.7 13.7 91% 3 10/26/2017 136 Upper Level Retaining Wall Lot 3, NW SG 105.2 14.3 91% 3 10/26/2017 137 Upper Level Retaining Wall Lot 3, NE SG 104.2 13.9 90% 3 10/26/2017 138 Upper Level Retaining Wall Lot 3, NE SG 104.6 13.8 91% 3 10/26/2017 139 Upper Level Retaining Wall Lot 3, E SG 103.9 14.2 90% 3 10/26/2017 140 Upper Level Retaining Wall Lot 3, E SG 104.8 14.4 91% 3 5/31/2018 141 Lot 4 Center/Finish Grade Pad FG 118.2 12.4 95% 2 ** TEST FAILED, SEE RETEST 3 TABLE I COMPACTION TEST SUMMARY Job Name: Tabata Ranch Job No. 10-12101G Job Address: Lemon Leaf Drive, Carlsbad Date: 11/14/2015 Date Test Location Elevation Density Moisture Relative Soil No. or Depth pcf Content Compaction Type Feet % Dry % Weight 5/31/2018 142 Lot 4 NE/Finish Grade Pad FG 115.9 12.7 93% 2 5/31/2018 143 Lot 4 NW/Finsh Grade Pad FG 113.5 12.2 91% 2 5/31/2018 144 Lot 4 West/Finish Grade Pad FG 113.1 12.4 91% 2 5/31/2018 145 Lot 4 East/Finish Grade Pad FG 112.7 12.8 91% 2 ** TEST FAILED, SEE RETEST 4 TABLE II LABORATORY TEST DATA Job Name: Tabata Ranch Job No. 10-12101G Job Address: Lemon Leaf Drive, Carlsbad Date 11/14/2015 Maximum Optimum Sample No.Dry Density Moisture Soil pcf Content Description %wt 1 125.9 9.5 2 124.3 10.0 3 115.2 12.3 4 145.1 Yellowish brown silty SAND Asphalt Concrete Light brown silty SAND with rock correction Light brown silty SAND 5 FINAL AS-GRADED GEOTECHNICAL REPORT PROPOSED TABATA RANCH SUBDIVISION LEMON LEAF DRIVE CARLSBAD, CALIFORNIA PREPARED FOR: TABATA FAMILY TRUST C/O: WNC GENERAL CONTRACTORS, INC. ATTENTION: MR. BRUCE WIEGAND 760 GARDEN VIEW CT., SUITE 200 ENCINITAS, CALIFORNIA PREPARED BY: CONSTRUCTION TESTING & ENGINEERING, INC. 1441 MONTIEL ROAD, SUITE 115 ESCONDIDO, CALIFORNIA 92026 CTE PROJECT NO. 10-13292G OCTOBER 27, 2017 Construction Testing & Engineering, Inc. Inspection I Testing I Geotechnical I Environmental & Construction Engineering I Civil Engineering I Surveying 1441 Montiel Road, Suite 115 I Escondido, CA92026 I Ph (760) 746-4955 I Fax (760) 746-9806 I www.cte-inc.net \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report All Lots OCT2017\Rpt_Comp (10- 13292G) 10-17.doc TABLE OF CONTENTS SECTION PAGE 1.0 BACKGROUND .......................................................................................................................1  2.0 PROJECT INFORMATION ......................................................................................................1  3.0 FILL PLACEMENT ..................................................................................................................2  4.0 TESTING ...................................................................................................................................3  5.0 ADDITIONAL CONSTRUCTION OBSERVATION ..............................................................3  6.0 CONCLUSIONS AND RECOMMENDATIONS ....................................................................4  7.0 LIMITATIONS ..........................................................................................................................4  TABLES TABLE I COMPACTION TEST SUMMARY TABLE II LABORATORY TEST DATA FIGURES FIGURE 1 SITE INDEX MAP FIGURE 2 COMPACTION TEST LOCATION MAP Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California October 27, 2017 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report All Lots OCT2017\Rpt_Comp (10- 13292G) 10-17.doc Page 1 1.0 BACKGROUND This document provides information regarding testing of compacted fill for the recently completed Tabata Ranch Subdivision located on Lemon Leaf Drive in Carlsbad, California. The site was previously graded based on the preliminary geotechnical investigation performed Vinje & Middleton Engineering, Inc. (Job No. 01-364-P) dated August 2, 2006 and subsequent Update Recommendations provided by CTE (2016). CTE reviewed the previously prepared report and was in general agreement with the data, conclusions, and recommendations. CTE previously provided an interim as-graded document for Lots 1-5 dated July 6, 2015 and modified August 2, 2015 (attached). Our work was authorized through CTE proposal no. G-3871, dated August 23, 2016. Based on the previously performed limited geotechnical report and as-grade documents, the site consists of Quaternary Previously Placed Fill soils overlying sedimentary bedrock units of the Eocene Age. The attached Figure 1 shows the approximate location of the site and surrounding area. 2.0 PROJECT INFORMATION This report includes a summary of test results and observations performed by CTE during the recent placement of compacted fill for the proposed structures and associated improvements. Conditions encountered at the site were found to consist of previously placed fill and residual soils overlying sedimentary bedrock. Previously placed fill and other disturbed near surface soils were generally found to consist of loose, silty sand. These materials were removed beneath improvement areas prior to placement of compacted fill as part of the recent grading operation. As indicated, Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California October 27, 2017 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report All Lots OCT2017\Rpt_Comp (10- 13292G) 10-17.doc Page 2 loose and disturbed surface soils and previously placed fill were excavated between elevations 253 (msl) and 272 (msl), depending on location. The exposed bottoms of excavations were observed, tested, and confirmed (as appropriate) prior to placement of the compacted fill. Exposed areas to receive fill were then scarified, moisture conditioned, and compacted in general accordance with project requirements. Following subgrade preparation, fill materials were moisture conditioned, placed in lifts, and compacted. Excavations and compaction within the improvement areas were conducted with a D8 dozer and a 980 loader. Mountain Movers was the grading contractor for the project. Grading on the subject site also consisted of parking and drive areas, minor excavations, wall backfill, and utility installation. Minor grading and compaction testing for utility tie-ins conducted in the adjacent Lonicera Street right-of-way is also documented herein. 3.0 FILL PLACEMENT Fill soils consisting of onsite stock piled materials were generally placed in uniformly compacted lifts at above optimum moisture content. Compaction was performed to the appropriate minimum values (90% for building pad areas and 95% for pavement subgrade areas), as determined by ASTM D1557. Grading was performed using standard construction equipment, followed by mixing, moisture conditioning, and compaction procedures. Backfill placement and compaction were performed in overall conformance with geotechnical recommendations. Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California October 27, 2017 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report All Lots OCT2017\Rpt_Comp (10- 13292G) 10-17.doc Page 3 4.0 TESTING Testing was performed to supplement field observations. Testing of compacted fill addressed by this report was conducted, as scheduled by the contractor, between October 19, 2016 and May 10, 2017. Field-testing of the compacted fill soil was conducted in accordance with ASTM D-6938-08a (nuclear method). Results of the field-testing indicate that fill materials were compacted to at least 90 percent or 95 percent of the laboratory maximum dry density, as required, in accordance with ASTM D 1557. Fill material was generally compacted at above optimum moisture content. Tabulated results of the field compaction testing are provided in the attached Table I, “Compaction Test Summary.” Laboratory determination of the reference compaction values for the fill materials is provided in Table II, “Laboratory Test Results.” Figure 2 shows the approximate location of the compaction tests performed. Based on site observations, it appears the Expansion Index (E.I.) for onsite materials were generally found to have a very low expansion potential (EI < 20). 5.0 ADDITIONAL CONSTRUCTION OBSERVATION Additional grading and backfilling, if any, should be observed and tested by CTE. In addition, prior to any significant future development, an appropriate update geotechnical investigation and report should be completed. Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California October 27, 2017 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report All Lots OCT2017\Rpt_Comp (10- 13292G) 10-17.doc Page 4 6.0 CONCLUSIONS AND RECOMMENDATIONS CTE concludes that the soil engineering and engineering geologic aspects of the grading covered by this report are in compliance with the approved geotechnical report and the grading plans (City of Carlsbad Drawing No. 471-9A, Assessors Parcel Numbers APN: 214-631-20 & 214-630-20). 7.0 LIMITATIONS As limited by the scope of the services that CTE agreed to perform, opinions presented herein are based on observations, test results, and understanding of the proposed site development. CTE’s service was performed according to the currently accepted standard of practice by reputable consultants. No warranty, express or implied, is given or intended with respect to the performance of the project in any respect. Submittal of this report should not be construed as relieving the grading contractor of his responsibility to comply with the project requirements. The opportunity to be of service is appreciated. If you have any questions regarding testing conducted, observations made during construction or recommendations presented herein, please do not hesitate to contact this office. Respectfully submitted, CONSTRUCTION TESTING & ENGINEERING, INC. Dan T. Math, GE #2665 Michael Balagtas Principal Engineer Staff Engineer MCB/DTM:nri Final As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California October 27, 2017 CTE Job No. 10-13292G \\ESC_SERVER\Projects\10-13000 to 10-13999 Projects\10-13292G\Compaction Report\Compaction Report All Lots OCT2017\Rpt_Comp (10- 13292G) 10-17.doc Page 5 Attachment: Interim As-Graded Geotechnical Report Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California CTE Job No. 10-12101G, dated July 6, 2015, Modified August 2, 2015 References: Summary for Testing of Compacted Fill for Lot 5 Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California CTE Job No. 10-13292G, dated February 6, 2017 Summary for Testing of Compacted Fill for Lots 1 and 2 Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California CTE Job No. 10-13292G, dated November 16, 2016 Summary for Testing of Compacted Fill for Lot 3 Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California CTE Job No. 10-13292G, dated May 10, 2017 Update Geotechnical Recommendations for Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad California CTE Job No. 10-13292G, dated August 26, 2016 Geotechnical and Update Report and Grading Plan Review Proposed Tabata Ranch Subdivision Lemon Leaf Drive, Carlsbad, California Vinje & Middleton Engineering Job # 01-364-P, dated August 2, 2006 Preliminary Geotechnical Investigation Proposed 4-Lot Subdivision, Tabata Ranch Off Camino De Las Ondas and Lonicera Street, Carlsbad, California Vinje & Middleton Engineering Job # 01-364-P, dated October 24, 2001 TABLE I COMPACTION TEST SUMMARY Job Name: Tabata Ranch Job No. 10-13292G Job Address: Lemon Leaf Drive, Carlsbad Ca Date: 10/27/2017 Date Test Location Elevation Density Moisture Relative Soil No. or Depth pcf Content Compaction Type Feet % Dry % Weight 10/19/2016 1 S.E Side Lonicera St AC 139.6 - 96% 1 10/19/2016 2 N.E Side Lonicera St AC 138.8 - 96% 1 10/19/2016 3 N.E Side Lonicera St AC 139.3 - 96% 1 10/19/2016 4 S.W Side Lonicera St AC 137.8 - 95% 1 10/19/2016 5 CTR Westside Lonicera St AC 139.9 - 96% 1 10/19/2016 6 N.W Side Lonicera St AC 139.2 - 96% 1 10/19/2016 7 N.E Side Lonicera St AC 138.4 - 95% 1 10/27/2016 8 Lot #1 Pad SG 118.9 10.4 94% 2 10/27/2016 9 Lot #1 Pad SG 115.5 10.7 92% 2 10/27/2016 10 Lot #2 Pad SG 118.4 10.4 94% 2 10/27/2016 11 Lot #2 Pad SG 117.7 10.3 93% 2 1/31/2017 12 Lot #5 SG 109.1 13.1 95% 3 1/31/2017 13 Lot #5 SG 110.7 13.3 96% 3 1/31/2017 14 Lot #5 SG 109.8 13.3 95% 3 5/10/2017 15 Building Pad #3 FG 110.6 12.7 96% 3 5/10/2017 16 Building Pad #3 FG 111.3 12.5 97% 3 10/26/2017 17 1st Level Retaining Wall Lot 3, NW SG 106.3 13.8 92% 3 10/26/2017 18 1st Level Retaining Wall Lot 3, N SG 104.9 14.3 91% 3 10/26/2017 19 1st Level Retaining Wall Lot 3, NE SG 104.5 14.0 91% 3 10/26/2017 20 1st Level Retaining Wall Lot 3, E SG 104.7 13.7 91% 3 10/26/2017 21 Upper Level Retaining Wall Lot 3, NW SG 105.2 14.3 91% 3 10/26/2017 22 Upper Level Retaining Wall Lot 3, NE SG 104.2 13.9 90% 3 10/26/2017 23 Upper Level Retaining Wall Lot 3, NE SG 104.6 13.8 91% 3 10/26/2017 24 Upper Level Retaining Wall Lot 3, E SG 103.9 14.2 90% 3 10/26/2017 25 Upper Level Retaining Wall Lot 3, E SG 104.8 14.4 91% 3 ** TEST FAILED, SEE RETEST 1 TABLE II LABORATORY TEST DATA Job Name: Tabata Ranch Job No. 10-13292G Job Address: Lemon Leaf Drive, Carlsbad Ca Date 10/11/2017 Maximum Optimum Sample No.Dry Density Moisture Soil pcf Content Description %wt 1 145.1 - 2 125.9 9.5 3 115.2 12.3 Yellowish Brown Silty Sand Asphalt Concrete Light Brown Silty Sand 2