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Home My WebLink AboutCT 13-04; GOLDEN SURF; FINAL SOILS SUMMARY LETTER; 2018-08-20ADVANCED C:EOTECHNI CAL sa..un ONS, I NC. 485 Corporate Drive, Suite B Escondido, California 92029 Telephone: (619) 867-0487 Fax: (714) 409-3287 NEW POINTE COMMUNITIES, INC. 16880 West Bernardo Drive, Suite 115 San Diego, CA 92127 August 20, 2018 P/W 1701-13 Repo1tNo. 1701-13-C-7 Attention: Subject: References: Mr. Scot Sandstrom Final Soils Summary Letter Lot 1 (Units 1 through 4) and Lot 2, Golden Surf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, California 1) Advanced Geotechnical Solutions, Inc., (AGS), "Prelimina,y Geotechnical Investigation, Proposed Golden Swf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, San Diego County, California" dated March 6, 2017, Report No. 1701-13-B-2. 2) Advanced Geotechnical Solutions, Inc., (AGS), "Project Grading Report, Lot 1 (Units 1 through 4) and Lot 2, Golden Swf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, San Diego County, California" dated October 24, 2017, Report No. 1701-13-C-5. Advanced Geotechnical Solutions, Inc. (AGS) observed the soil and geologic conditions at the subject project during site grading and improvement construction, and found them to be substantially in conformance with those assumed in the approved geotechnical rep01t (Reference 1) and described in the project grading repo1t (Reference 2). Unsuitable soils in the subject building pad areas were removed and replaced with compacted fill soils to approximate design finish grades. Soil backfill of utility lines was compacted to at least 90 percent of maximum dry density as determined by ASTM: D-1557. Footing excavations for the proposed single-family residences were observed to extend to a suitable bearing strata and meet minimum embedment requirements. The soil has been tested for expansive characteristics and determined to possess "very low to medium" potential for expansion. The upper soils were tested for soluble sulfate concentrations and found to have "negligible" sulfate concentrations. Based on AGS's testing and observations and review of the referenced repo1ts, the soil engineering and engineering geologic aspects of the grading are in compliance with the approved geotechnical report and the grading and improvement plans. The subject building pads are considered suitable for suppo1t of the proposed Respectfully Submitted, Advanced Geotechni Solutions, Inc JE F . CHAN , resident RCE 46544, RGE 2314, Reg. Exp. 6-30-19 Distribution: (3) Addressee ORANGE AND L.A. COUNTIES (714) 786-5661 INLAND EMPIRE (619) 708-1649 SAN DIEGO AND IMPERIAL COUNTIES (619) 850-3980 NEW POINTE COMMUNITIES, INC. 16880 West Bernardo Drive, Suite 230 San Diego, CA 92127 Attention: Mr. Tyler Sandstrom ADVANCED GEOTECHNICAL SOLUTIONS, INC. 485 Corporate Drive, Suite B Escondido, California 92029 Telephone: (619) 867-0487 Fax: (714) 409-3287 August 20, 2018 P/W 1701-13 Report No. 1701-13-C-8 Subject: Supplemental Compaction Report, Masonry Retaining Walls, Golden Surf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, San Diego County, California References: See Appendix In accordance with your request, Advanced Geotechnical Solutions, Inc. (AGS) has prepared this repoti summarizing our observation and test results collected during the construction of the Masonry Retaining walls at the Golden Surf Residential Development, 1000 Camino De Las Ondas in the City of Carlsbad, California. The specific locations of these walls are shown on Plates I through 3 (utilizing the most current Retaining Wall Addition Exhibit as a base). The subject walls were constructed as part of the ongoing development of the Golden Surf project. The subject walls were constructed under the periodic observation and testing of AGS. Specifically, AGS personnel conducted the following services during the construction of the subject wall: • Observed footing excavations to verify that the footings were founded in firm competent materials; • Conducted periodic observations to verify Masonry retaining walls were constructed in general conformance to the plans and recommendations presented in the referenced repo1ts and the San Diego Regional Standard Drawings. • Observed wall backdrains. • Provided periodic compaction testing of the backfill to verify the minimum compaction criteria (minimum of 90% of the laboratory maximum density per ASTM D-1557) was meet; During the placement of the masonry wall backfill, representatives of AGS observed and conducted periodic compaction testing. In general, the majority of the wall backfill consisted of crushed rock (314inch) capped with approximately 12 to 18 inches of locally derived soils. During the backfill operations the wall backfill was moisture conditioned to or slightly above optimum moisture content, placed in thin, loose lifts (approximately 12 inches), and compacted to a minimum of 90 percent of the laboratory maximum dry density in accordance with ASTM Test Method D-1557. Compaction was achieved utilizing a vibratory and hand operated tampers. ORANGE AND L.A. COUNTIES (714) 786-5661 INLAND EMPIRE (619) 867-0487 SAN DIEGO AND IMPERIAL COUNTIES (619) 867-0487 August 20, 2018 P/W 1701-03 APPENDIX,REFERENCES Page 3 Repo1iNo. 1701-13-C-8 Advanced Geotechnical Solutions, Inc., (AGS), "Preliminary Geotechnical Investigation, Proposed Golden Surf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, San Diego County, California" dated March 6, 2017, Report No. 1701-13-B-2 Advanced Geotechnical Solutions, Inc., (AGS), "Foundation Plan Review for Golden Surf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, San Diego County, California" dated August 29, 2017, Repo1tNo. 1701-13-B-D-4 Advanced Geotechnical Solutions, Inc., (AGS), "Project Grading Repo1t, Lot 1 (Units 1 through 4) and Lot 2, Golden Surf Residential Development, 1000 Camino De Las Ondas, City of Carlsbad, San Diego County, California" dated October 24 , 2017, Repo1t No. 1701-13-C-5 ADVANCED GEOTECHNICAL SOLUTIONS, INC. August 20, 2018 P/W 1701-13 FIELD DENSITY TEST RESULTS TABLE 1 (cont'd) TEST NUMBER/LOCATION/ELEVATION KEY Page 2 of Table 1 Report No. 1701-13-C-8 S -Sewer Trench I -Irrigation Trench SD -Storm Drain Trench E -Electrical Trench JT -Joint Utility Trench W -Water Trench RTW -Retaining Wall FTG -Footing FG -Finish Grade SG -Subgrade CG -Curb and Gutter Subgrade B -Base AC -Asphalt Concrete Fi_nish Grade BC -Asphalt Concrete Base Course CC -Asphalt Concrete Cap Course -R,Rl,R2 -Indicates Retest * Rock Correction-Estimated Percent Retained on #4 Sieve (Method A) or 3/4 inch (Method C), Maximum Dry Density and Optimum Moisture Content adjusted per ASTM D 4718 Depth Moisture Dry Density Rel. Proj. Test Pass Test or Soil Rock (%} (pcf} Comp. Spec. Type or Date Number Location Elev. Type Corr.* Opt. Field Max. Field (%} {%} {S/N} Fail 10/13/17 140RTW Lot 2 168 A 9.0 11.8 128.S 117.0 91 90 N Pass 10/13/17 141RTW Lot 2 169 A 9.0 11.6 128.S 119.4 92 90 N Pass 10/16/17 144RTW Lot 2 167 E 7.5 9.7 132.5 119.8 90 90 N Pass 10/16/17 145RTW Lot 2 169 E 7.5 11.2 132.5 120.6 91 90 N Pass 10/16/17 147RTW Lot 2 170 E 7.5 10.6 132.5 122.4 92 90 N Pass 10/17/17 150RTW Lot 2 171 E 7.5 9.6 132.5 123.4 93 90 N Pass 10/17/17 151RTW Lot 1 -Unit 1 166 B 8.5 8.9 133.0 121.7 91 90 N Pass 10/17/17 152RTW Lot 1-Unit 2 165 B 8.5 9.4 133.0 122.S 92 90 N Pass 10/18/17 156RTW Lot 2 170 E 7.5 11.2 132.S 121.0 91 90 N Pass 10/18/17 157RTW Lot 1-Unit 1 167 B 8.5 9.1 133.0 125.7 94 90 N Pass 10/18/17 159RTW Lot 1-Unit 2 167 B 8.5 10.7 133.0 121.7 91 90 N Pass 10/19/17 160RTW Lot 1-Unit 1 169 B 8.5 11.2 133.0 123.9 93 90 N Pass 10/19/17 161RTW Lot 1-Unit 2 168 B 8.5 9.6 133.0 121.2 91 90 N Pass 08/13/18 166RTW Lot 2 164 B 8.5 11.2 133.0 109.2 82 90 N Fail 08/13/18 167RTW Lot 2 164 B 8.5 6.2 133.0 111.2 83 90 N Fail 08/13/18 168RTW Lot 2 164 B 8.5 7.0 133.0 110.4 83 90 N Fail 08/13/18 169RTW Lot 1 166 B 8.5 7.2 133.0 115.1 86 90 N Fail 08/13/18 170RTW Lot 1 166 B 8.5 7.1 133.0 109.S 82 90 N Fail 08/20/18 166RTW-R Lot 2 164 B 8.5 9.1 133.0 121.7 91 90 N Pass 08/20/18 167RTW-R Lot 2 164 B 8.5 9.4 133.0 121.2 91 90 N Pass ADVANCED GEOTECHNICAL SOLUTIONS, INC. I I I I l I '~ I I I i I I \ 5 0 b-11--1-U W1 SCALE: 7" = 5' □□ BB□·t', ,f ?;I, I' ,~fc(, ~ □□□1 11 1 1 1 1 1 I I\ 7 J I I I I RETAINING WALL ADDmON EXHIBIT FOR: GOLDEN SURF GP496-4A LOT 1 ~ UNIT2 '?L-1\"TE 3 SHEET2