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Home My WebLink AboutCDP 2017-0018; POLZIN RESIDENCE; FINAL SOILS REPORT; 2020-11-03South Shore Testin & Environmental 23 811 Washington Ave, Suite C 110, # 112, Murrieta, CA 92562 Phone: (951) 239-3008 FAX: (951) 239-3122 November 3, 2020 Mr. Joe Polzin P.O. Box268 Temecula, CA 92593 SUBJECT: FINAL REPORT OF COMP ACTION TESTING Proposed Single-Family Residence 4382 Adams Street City of Carlsbad, San Diego County, California Work Order No. 3011601.22F Dear Mr. Polzin: INTRODUCTION E-mail: ss.testing@aol.com In accordance with your authorization, South Shore Testing & Environmental has compiled this Final Report of Compaction Testing presenting the results of our observation and testing during post grading for site improvements for the above referenced single-family residence. All compaction test results are included in this report in Appendix C, Table I. The subject residential development was graded and improved in accordance with the requirements of the City of Carlsbad and the 2019 California Building Code (CBC). The 10-scale "Landscape Improvement Plan" prepared by Robert Taft & Associates of Temecula, California, was utilized to plot the location of all field density tests conducted during the post grading improvements. A reduced copy of the "Landscape Improvement Plan," was utilized as a base map for our Compaction Test Location Map, Plate 1. Proposed Development A single-family residence has been constrncted on the central portion of the site with driveway access from Adams Street (4382 Adams Street). South Shore Testing & Environmental W.O. 3011601.22F Mr. Joe Polzin November 3, 2020 Page 2 Site Description The subject residence and garage pads cover most of the central portion of a nearly rectangular- shaped 0.38-acre parcel located along the northeasterly side of Adams Street ( 4382) in the City of Carlsbad, westerly San Diego County, California. The site is bounded on the west, east and north by residential development, and on the south by Adams Street and vacant land. SITE IMPROVEMENTS Site Improvements Included: • Construction and compaction of water, sewer, and joint utility lines. • Retaining wall backfill. • Performance of a footing inspection. Testing and Footing Excavation Inspection Testing and inspection of the footing excavations, for the house took place on both Januaiy 7, 2019 (main house) and March 14, 2019 (casitas area). Footing excavations exposed medium dense to dense engineered fill soils that consisted of medium brown silty Sand (Unified Soils Classification- SM). The footing excavations for the residence were free of slough and debris. A minimum degree of compaction of 90%, as determined by ASTM D1557 test method A, was required. Reinforcement for both the slab and footings were constrncted in accordance with the referenced geotechnical reports, the 2019 CBC and the City of Orange specifications. Retaining Wall Backfill Testing and observation of the retaining wall backfill took place between August 30, 2018 and November 7, 2018. The materials used for backfilling consisted of medium brown silty Sand (Unified Soils Classification-SM). Following placement and shading of the drainpipe, fill placement and compaction was achieved utilizing a backhoe with compacting wheel, a hand wacker, and a water hose as needed. Fill was placed in thin lifts and moisture conditioned, as needed, to bring the material to neai· optimum moisture content, and was then properly compacted. A minimum degree of compaction of 90%, as dete1mined by ASTM D1557 test method A, was required. South Shore Testing & Environmental W.O.3011601.22F Mr. Joe Polzin November 3, 2020 Page 3 Joint Utility Trench Sewer and Water Trench Backfill Testing and observation of the joint utility trench, sewer and water line backfill took place on March 21 and 26, 2018 and February 28, 2019, respectively. The materials used for backfilling consisted of medium brown silty Sand (Unified Soils Classification-SM). Following placement and shading of the drainpipe, fill placement and compaction was achieved utilizing a backhoe with compacting wheel, a hand wacker, and a water hose as needed. Fill was placed in thin lifts and moisture conditioned, as needed, to bring the material to near optimum moisture content, and was then properly compacted. A minimum degree of compaction of 90%, as determined by ASTM D1557 test method A, was required. TESTING PROCEDURES Field Density Testing Field density testing was performed in accordance with ASTM Test Method D 6938-06el (nuclear gauge). Areas failing to meet the minimum compaction requirements were reworked and retested until the specified degree of compaction were achieved. The elevations and the results of the field density tests are presented in Appendix C, Results of Compaction Tests, Table I. The approximate locations of the tests are shown on the Compaction Test Location Map, Plate 1. Maximum Density Determinations Maximum Density/Optimum Moisture dete1minations were performed in the laborat01y on representative samples of onsite soils used in the fill operations. The tests were performed in accordance with ASTM D1557, Test Method A. The test results, which were utilized in determining the degree of compaction achieved during fill placement, are presented in Appendix B, Table I. LIMITATIONS Our professional services were performed using the degree of care and skill ordinarily exercised, under similar circumstances, by reputable Geotechnical Engineers and Geologists practicing in this or similar localities. No other wananty, expressed or implied, is made as to the conclusions and professional advice included in this rep01i. South Shore Testing & Environmental W.O. 3011601.22F Mr. Joe Polzin November 3, 2020 Page4 This rep01t is issued with the understanding that it is used only by the owner and it is the sole responsibility of the owner or their representative to ensure that the information and recommendations contained herein are brought to the attention of the architect, engineer, and appropriate jurisdictional agency for the project and incorporated into the plans; and the necessary steps are taken to see that the contractor and subcontractors carry out such recommendations contained herein during construction and in the field. The findings of this report are valid as of the present date. However, changes in the conditions of a property can occur with the passage of time, whether due to natural processes or the works of man on this or adjacent properties. In addition, changes in applicable or appropriate standards may occur, whether they result from legislation or the broadening of knowledge. Accordingly, the findings of this report may be invalidated wholly or prutially by changes outside our control. Therefore, this repo11 is subject to review and revision as changed conditions are identified. The firm that performed the geotechnical investigation for this project should be retained to provide testing observation services during construction to maintain continuity of geotechnical interpretation and to check that the recommendations presented herein are implemented during site grading, excavation of foundations and construction of improvements. If another geotechnical firm is selected to perform the testing and observation services during construction operations, that film should prepare a letter indicating their intent to assume the responsibilities of project geotechnical engineer of record. Selection of another firm to perfo1m any of the recommended activities or failure to retain the undersigned to perform the recommended activities wholly absolves South Shore Testing & Environmental, the undersigned, and its assigns from any and all liability ru·ising directly or indirectly from any aspects of this project. South Shore Testing & Environmental W.O. 3011601.22F APPENDIXA References South Shore Testing & Environmental W.O. 3011601.22F REFERENCES California Building Standards Commission, 2019, "2019 California Building Code", California Code of Regulations, Title 24, Part 2, Volumes 1 and 2 of 2. Civil Consulting, Febrnary 5, 2018, "Proposed Grading Plan, P01tion of Lot 78 of Tract 918, 10422 Orange Park Blvd, Orange County, CA", Scale: 1" = 10', Sheet GP 2, GB 170080. Department of Water Resources Website, 2018, "Groundwater Data Section". Orange County Public Works-Grading/Geotechnical Unit, October 10, 2017, "Geotechnical Report Review Sheet, 10422 Orange Park Blvd., Orange, CA 92869", Building Permit No: RS161615/GB170080. Robe1t Taft & Associates, September 25, 2019, "Landscape Improvement Plans for Polzin Residence, 4 3 90 Adams Street, Constrnction Plan", Sheets 1 thrn 12 of 12, Scale 1" = 10', Project No. LPC2017-0050/ CDP2017-2018. South Shore Testing & Environmental, 2018a, "Rep01t of Precise Grade Compaction Testing, Proposed House and Garage Pads, 4382 Adams Street, City of Carlsbad, San Diego County, California", Work Order No. 3011601.22, Dated December 17, 2018. South Shore Testing & Environmental, 2018b, "Stability of Existing Backcuts for Retaining Walls, Proposed Retaining Wall, 4382 Adams Street, City of Carlsbad, San Diego County, California", Work Order No. 3011601.00F, Dated July 27, 2018. South Shore Testing & Environmental, 2018c, "Response to the City of Carlsbad Constrnction Change Resubmittal Checklist, Proposed Retaining Wall, 4382 Adams Street, City of Carlsbad, San Diego County, California", Work Order No. 3011601.00R, Dated June 11, 2018. South Shore Testing & Environmental, 2018d, "Backcut Slope Evaluation, Proposed Retaining Wall, 4382 Adams Street, City of Carlsbad, San Diego County, California", Work Order No. 3011601.00B, Dated May 17, 2018. South Shore Testing & Environmental, 2017, "Updated Preliminruy Geotechnical Investigation, Proposed Single-Family Residence, 4382 Adams Street, City of Cru·lsbad, San Diego County, California", Work Order No. 3011601.00AR, Dated October 3, 2017. Spear & Associates, Inc., 2017, "Precise Grading Plan for: Polzin Residence, 4382 Adams Street, Carlsbad, CA 92008", Sheet 1 thrn 6 of 6, Scale: 1" = 10'. Project No. CDP 2017-0018. South Shore Testing & Environmental W.O. 3011601.22F APPENDIXB Laboratory Test Results South Shore Testing & Environmental W.O. 3011601.22F TABLEI Maximum Density/Optimum Moisture % Description Lbs/Ft3 Moisture 1 Medium Brown Silty Sand (SM) 127.6 7.7 South Shore Testing & Environmental W.O. 3011601.22F APPENDIXC Results of Compaction Tests South Shore Testing & Environmental W.O. 301160l.22F TABLEI RESULTS OF COMPACTION TESTS Job No.: 3011601.22F Name: Joe Polzin -10422 Orange Park Blvd Date: Nov. 2020 Test Test Elevation Moisture Unit Dry Relative Soil Test Location No. Date Depth Content Density Compaction Type See Plate 1 (Feet) (%) (PCF) (%) 1 03/21/18 FG 8.6 122.6 96N 1 Joint Utility 2 II FG 8.3 123.1 96N 1 II 3** II FG 7.0 106.3 83N 1 II 4 03/26/18 FG 7.7 123.1 96N 1 II 5 II FG 8.1 122.7 96N 1 II 3A II FG 8.4 122.0 96N 1 II 6 08/30/18 +4 10.3 119.8 94N 1 Retaining Wall 7 II +6 10.6 118.7 93N 1 II 8 II +6 10.0 120.1 94N 1 II 9 09/27/18 +3 8.6 121.9 96N 1 II 10 II +4 9.0 121.6 95N 1 II 11 II +6 7.5 122.1 96N 1 II 12 II +4 7.0 123.7 97N 1 II 13 II +6 7.3 123.6 96N 1 II 14 II +8 7.5 124.5 98N 1 II 15 10/10/18 +10 10.3 121.3 95N 1 II 16 II +8 10.0 121.5 95N 1 II 17 II +10 8.9 123.1 97N 1 II 18 II +10 9.3 122.6 96N 1 II 19 10/30/18 +2 8.9 121.6 95N 1 II SEE PLAN FOR TEST LOCATIONS SC -Sand Cone ASTM D1556-64; DC-Drive Cylinder ASTM D2937-71; N-Nuclear ASTM 3017; NG-Natural Ground+ 85% = Passing Test; SG-Subgrade; FG-Finish Grade; **Test Failed, See Retest South Shore Testing & Environmental W.O. 3011601.22F TABLEI RESULTS OF COMPACTION TESTS Job No.: 3011601.22F Name: Joe Polzin -10422 Orange Park Blvd Date: Nov. 2020 Test Test Elevation Moisture Unit Dry Relative Soil Test Location No. Date Depth Content Density Compaction Type See Plate 1 (Feet) (%) (PCF) (%) 20 10/30/18 +3 9.3 120.9 95N 1 Retaining Wall 21 II +4 9.5 119.8 94N 1 II 22 II +5 7.6 122.3 96N 1 II 23 10/31/18 +7 11.3 119.0 93N 1 II 24 II +8 11.8 118.8 93N 1 II 25 II +10 10.3 120.3 94N 1 " 26 " +12 10.0 121.0 95N 1 II 27 11/07/18 +3 7.9 115.2 90N 1 " 28 " +4 8.3 115.9 91N 1 II 29 II +5 8.6 121.9 96N 1 II 30 II +4 9.0 121.6 95N 1 II 31 11/20/18 FG 7.5 122.1 96N 1 " 32 II FG 7.0 123.7 97N 1 II 33 II FG 7.3 123.6 96N 1 II 34 II FG 7.5 124.5 98N 1 Upper Pad 35 " FG 10.3 121.3 95N 1 II 36 " FG 10.0 121.5 95N 1 II 37 II FG 8.9 123.1 97N 1 II 38 02/28/19 +2 8.7 118.5 93N 1 Sewer Line 39 II +3 9.0 117.7 92N 1 40 II FG 9.3 119.0 93N 1 SEE PLAN FOR TEST LOCATIONS SC -Sand Cone ASTM D1556-64; DC-Drive Cylinder ASTM D2937-71; N-Nuclear ASTM 3017; NG-Natural Ground+ 85% = Passing Test; SG-Subgrade; FG-Finish Grade; **Test Failed, See Retest South Shore Testing & Environmental W.O. 3011601.22F TABLE! RESULTS OF COMPACTION TESTS Job No.: 3011601.22F Name: Joe Polzin -10422 Orange Park Blvd Date: Nov. 2020 Test Test Elevation Moisture Unit Dry Relative Soil Test Location No. Date Depth Content Density Compaction Type See Plate 1 (Feet) (%) (PCF) (%) 41 02/28/19 +1 9.3 114.9 90N 1 Water Line 42 II +2 9.5 115.2 90N 1 II 43 II FG 7.6 115.5 91N 1 II SEE PLAN FOR TEST LOCATIONS SC -Sand Cone ASTM Dl556-64; DC-Drive Cylinder ASTM D2937-71; N-Nuclear ASTM 3017; NG-Natural Ground+ 85% = Passing Test SG-Subgrade; FG-Finish Grade; **Test Failed, See Retest South Shore Testing & Environmental W.O. 3011601.22F