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Home My WebLink AboutNCP 2022-0002; DE FREITAS RESIDENCE; FINAL SOILS REPORT; 2024-12-04 AS-GRADED COMPACTION REPORT 4339 PARK DRIVE, CARLSBAD SAN DIEGO COUNTY, CALIFORNIA 92008 FOR MS. PATIANE FREITAS 4339 PARK DRIVE CARLSBAD, CALIFORNIA 92008 W.O. 8286-B/F-SC DECEMBER 04, 2024 Geotechnical ∙ Geologic ∙ Coastal ∙ Environmental 1817 Aston Ave. Suite 104, Carlsbad, CA 92008 TEL: (760) 438-3155 - FAX: (760) 931-0915 www.geosoilsinc.com December 04, 2024 W.O. 8286-B/F-SC Ms. Patiane Freitas 4339 Park Drive Carlsbad, California 92008 Subject: As-Graded Compaction Report, 4339 Park Drive, Carlsbad, San Diego County, California 92008 References: 1.“Limited Geotechnical Evaluation for a Planned Single-Family Residence, Including Retaining Walls, 4339 Park Drive, Carlsbad, California 92008, APN 206-192-01-00,” W.O. 8286-A-SC, dated March 8, 2022, revised October 10, 2022, by GeoSoils, Inc. 2.“Addendum and Response to City of Carlsbad Comments, Proposed Single-Family Residence, 4339 Park Drive, Carlsbad, California 92008" W.O. 8286-A1-SC, dated January 20, 2023 by GeoSoils, Inc. 3.“Addendum and Response to City of Carlsbad Comments, Proposed Single-Family Residence, 4339 Park Drive, Carlsbad, California 92008," W.O. 8286-A1-SC, dated February 1, 2023, by GeoSoils, Inc. 4.“Geotechnical Plan Review, Proposed Single-Family Residence, 4339 Park Drive, Carlsbad, California,” W.O. 8286-A1-SC, February 17, 2023, by GeoSoils, Inc. 5.“Grading Plans for De Freitas Residence,” dated June 20, 2023, by Hacienda Development Solutions, Inc. Dear Ms. Freitas: In accordance with your request, and as required by the City, GeoSoils, Inc. (GSI) has prepared this as-graded compaction report of grading at the site. Observations and field compaction testing for grading occurred periodically between August 15, 2023 and November 14, 2023. Grading associated with the preparation of the upper and lower building pads was observed and fill was selectively tested by a representative of GSI, on a part-time, as-needed basis. The scheduling of such was solely determined by your field representative, and GSI relied on this information to properly assess geotechnical quality assurance. Line and grade was provided by others and not GSI. Unless specifically superseded herein, the conclusions and recommendations in the referenced geotechnical reports (see References 1 through 3) and plans reviewed by this firm (see Reference 5) remain valid and applicable and should be appropriately implemented during the balance of construction. Ms. Patiane Freitas W.O. 8286-B/F-SC 4339 Park Drive, Carlsbad December 04, 2024 File:z:\cb\8200\8286bf.agc Page 3 GEOTECHNICAL ENGINEERING Overexcavation Observations of overexcavation were performed by GSI. Grading appears to be in accordance with recommendations provided by GSI (see References 1 through 3). Engineered Fill Placement Engineered fill materials consisted of the onsite soils derived from the overexcavations. During grading, engineered fills were placed in approximately 6-inch lifts, moisture conditioned, mixed to achieve slightly greater than optimum moisture conditions, and mechanically compacted to a minimum relative compaction of 90 percent of the laboratory standard (ASTM D 1557), where tested. Compaction Testing Field density tests on grading related to pad preparation and retaining wall backfill were performed using the nuclear (densometer) ASTM test method D 6938-10 (Procedure A). The test results obtained indicate that compacted fill soils appear to meet the minimum compaction/moisture requirements recommended by this office (i.e., at least 90 percent relative compaction, and at least optimum moisture, per ASTM D 1557 [see the attached Table 1]), where tested. Failing test areas were reworked/removed and replaced with compacted fill. A summary of compaction tests is presented on the attached Table 1. Approximate test locations are located on Plate 1 (Field Density Test Location Map). PURPOSE OF GRADING The primary purpose of grading was to create building pads for the said single-family home. LABORATORY TESTING Maximum Density Testing The laboratory maximum dry density and optimum moisture content for the major soil type encountered during grading and initial investigation were evaluated in general accordance with test method ASTM D 1557. The following table presents the results: This report includes the grading performed for the construction of the upper and lower building pads! "# $%&& "# '"()*&& +%,-.,/%0 -., 12% ,%1"34345 $"&&. Ms. Patiane Freitas W.O. 8286-B/F-SC 4339 Park Drive, Carlsbad December 04, 2024 File:z:\cb\8200\8286bf.agc Page 4 SOIL TYPE MAXIMUM DENSITY (PCF) MOISTURE CONTENT (PERCENT) A - Reddish Brown Silty Sand 127.4 9.5 Conclusions The work performed to date appears to be in general conformance with the preliminary recommendations contained in References 1 through 3, GSI field recommendations, Appendix Chapter J of the 2022 California Building Code, and with the grading guidelines of the City, from a geotechnical standpoint. Retaining wall backfill was placed in accordance with GSI’s recommendations and the project plans. Field testing indicates that fills placed under the purview of this report have been compacted to at least 90 percent of the laboratory standard (ASTM D 1557), where tested. Based on the observation and compaction testing performed, GSI concludes that the building pads are suitable for their intended use. REGULATORY COMPLIANCE The soil engineering and engineering geologic aspects of the construction are in general compliance with the approved geotechnical reports and geotechnical aspects of the construction. Furthermore, with respect to the grading plans, GSI will certify1 that the soil engineering and engineering geologic aspects of the building pads are in general compliance with the approved geotechnical reports (see References 1 through 3) and the grading site plan (Reference 5). LIMITATIONS The conclusions and recommendations presented herein are professional opinions. These opinions have been derived in accordance with current standards of practice, and no warranty, either express or implied, is given. Standards of practice are subject to change with time. GSI assumes no responsibility or liability for work or testing performed by others, or their inaction; or work performed when GSI is not requested to be onsite, to evaluate if our recommendations have been properly implemented. Use of this report constitutes an agreement and consent by the user to all the limitations outlined above, notwithstanding any other agreements that may be in place. In addition, this report may be subject to review by the controlling authorities. The term “Certify” is used herein as defined in Division 3, Chapter 7, Article 3, § 6735.5 of the California Business and Professions Code (2023). Ms. Patiane Freitas W.O. 8286-B/F-SC 4339 Park Drive, Carlsbad December 04, 2024 File:z:\cb\8200\8286bf.agc Page 5 If you have any questions or comments regarding this letter, please do not hesitate to contact the undersigned. Respectfully submitted, GeoSoils, Inc. John P. Franklin Stephen J. Coover Engineering Geologist, CEG 1340 Geotechnical Engineer, GE 2057 JPF/SJC/ef Attachments: Table 1 - Field Density Test Results Plate 1 - Field Density Test Location Map Distribution: (1) Addressee (PDF via email) Table 1 FIELD DENSITY TEST RESULTS W.O. 8500-B Print Date: 12/04/2024 TEST DATE TEST LOCATION TRACT ELEV MOISTURE DRY REL TEST SOIL NO.NO.OR CONTENT DENSITY COMP METHOD TYPE DEPTH (ft)(%)(pcf)(%) Phase B GRADING 1 8/16/23 North Center Upper Addition 4339 Park Drive 83.5 9.7 115.6 90.7 ND A 2 8/16/23 Southwest Upper Addition 4339 Park Drive 83.5 9.9 115.3 90.5 ND A 3 8/16/23 Northeast Upper Addition 4339 Park Drive 83.5 10.0 116.8 91.7 ND A 4*8/17/23 Northwest Upper Addition Pad 4339 Park Drive FG 13.2 113.0 88.7 ND A 4A 8/18/23 Retest Northeast Upper Addition Pad 4339 Park Drive FG 9.8 115.5 90.6 ND A 5 8/17/23 Northeast Upper Addition Pad 4339 Park Drive FG 12.7 114.8 90.1 ND A 6 8/25/23 Southwest Upper Addition Pad 4339 Park Drive FG 9.9 124.6 97.8 ND A 7 8/25/23 Southeast Upper Addition Pad 4339 Park Drive FG 9.7 114.8 90.1 ND A 8 8/25/23 Northeast Lower Garage Pad 4339 Park Drive 72.0 9.5 120.2 94.4 ND A 9 8/25/23 Soutth Edge Center Garage Pad 4339 Park Drive 72.0 9.6 116.3 91.3 ND A 10 8/25/23 West Edge Center Garage Pad 4339 Park Drive 72.0 10.2 119.7 94.0 ND A 11 8/29/23 Northeast Side Garage Pad 4339 Park Drive FG 9.7 125.5 98.5 ND A 12 8/29/23 Southeast Corner Garage Pad 4339 Park Drive FG 10.1 120.1 94.3 ND A 13 8/29/23 Center Garage Pad 4339 Park Drive FG 9.5 120.1 94.2 ND A 14 8/29/23 Southwest Corner Garage Pad 4339 Park Drive FG 10.3 119.1 93.5 ND A 15 11/23/24 4339 Park Drive 82.0 11.9 116.7 91.6 ND A 16 11/23/24 4339 Park Drive 82.0 11.5 115.8 90.9 ND A 17 11/9/23 4339 Park Drive 83.0 11.8 115.1 90.4 ND A 18 11/9/23 4339 Park Drive 83.0 11.2 116.1 91.1 ND A 19 11/9/23 4339 Park Drive 85.0 12.4 115.9 91.0 ND A 20 11/9/23 4339 Park Drive 85.0 10.8 116.5 91.4 ND A Phase F 1*11/6/23 Center 4339 Park Drive 78.0 8.7 109.5 86.2 ND A 1A 11/6/23 Center 4339 Park Drive 78.0 10.7 117.5 92.3 ND A 1B 11/7/23 Central Retaining Wall Lower Pad 4339 Park Drive 78.0 10.2 118.5 93.0 ND A 2 11/6/23 North 4339 Park Drive 76.5 11.7 117.5 92.3 ND A 3 11/6/23 South 4339 Park Drive 77.0 9.7 116.1 91.2 ND A 4 11/6/23 South 4339 Park Drive 78.0 10.9 116.2 91.2 ND A 5 11/6/23 Southwest 4339 Park Drive 79.0 11.4 119.3 93.7 ND A 6 11/6/23 Northwest 4339 Park Drive 79.0 9.6 121.2 95.2 ND A 7 11/6/23 North 4339 Park Drive 77.5 10.1 119.5 93.8 ND A 8 11/8/23 Retaining Wall 4339 Park Drive -18'11.5 118.7 93.2 ND A 9 11/8/23 Retaining Wall 4339 Park Drive -3'11.9 118.9 93.3 ND A 10 11/14/23 Retaining Wall 4339 Park Drive FG 12.3 117.5 92.3 ND A 11 11/14/23 Retaining Wall 4339 Park Drive FG 11.9 116.8 91.7 ND A LEGEND *=Failing Test A =Retest Patiane Freitas 4339 Park Drive, Carlsbad File: C:\excel\tables\8200\8286b.tbl1 GeoSoils, Inc. W.O. 8286-BF-SC December 2024 Page 1 UPPER PAD RETAINING WALL GARAGE PAD/UPPER PAD/CONCRETE DECK Upper Pad Northwest Side/Deck Upper Pad/Deck Upper Pad/Deck Upper Pad/Deck Upper Pad/Deck Upper Pad/Deck Plate 1 See Bar Scale DATE: 12/04 W.O. 8286-B/F-SC ALL LOCATIONS ARE APPROXIMATE This document or e-file is not part of the Construction Documents and should not be relied upon as being an accurate depiction of design. FIELD DENSITY LOCATION MAP GSI LEGEND B-13 NOT A PART OF THIS STUDY 20 40 60 1” = 20’ N.A.P. APPROXIMATE LIMITS OF FILL PLACED UNDER THE PURVIEW OF THIS REPORT APPROXIMATE LOCATION OF PAD FIELD DENISTY B-3 B-2 B-1 B-5 B-4*A*B B-7B-6 B-8 B-10 B-9 B-11 B-12 B-13 N.A.P. N.A.P. N.A.P. N.A.P. N.A.P. N.A.P. F-11 APPROXIMATE LOCATION OF RETAINING WALL FIELD DENISTY TEST B-14 F-8 F-1*A*B F-9 F-7 F-6 F-2 F-5 F-4 F-11 F-3 F-10 B-20 B-19B-18 B-17 B-16 B-15