The URL can be used to link to this page

Home My WebLink AboutCT 2016-0002; TOWN HOUSE; FINAL SOILS REPORT; 2020-09-08Final As-Graded Soil Report for Proposed Townhouse Building 2677 State Street Carlsbad, California 92008 REFERENCES Page 2 September 8, 2020 Project No. 18-1106D5 1. "Report of Field Density Tests, Waterline Trench Backfill, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18-1106D5, Prepared by East County Soil Consultation and Engineering, Inc., Dated February 7, 2019. 2. "Foundation Excavation Observation, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92 008"., -Project No. 18-110605., Prepared by East County Sail Consultation and Engineering, Inc., Dated October 8, 2018 . 3. "Report of Field Density Tests, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18-1106D5, Prepared by East County Soil Consultation and Engineering, Inc., Dated September 24, 2018. 4. "Transfer ·of Geotechnical Responsibility, Geotechnical Engineer ·of Record, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18- 1106D5, Prepared by East County Soil Consultation and Engineering, Inc., Dated July 16, 2018. 5. "Geotechnical Investigation, Proposed Townhouse Building, 2677 State Street, Carlsbad, California", Project No. 8436.1, Log No. 19513, Prepared by Heatherington Engineering, Inc., Dated November 3, 2017. EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC. EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC. Mark Benjamin Archipelago Development P.O. Box 7050 10925 HARTLEY ROAD, SUITE "I" SANTEE, CALIFORNIA 92071 (619) 258-7901 Fax 258-7902 Rancho Santa Fe, California 92067 Subject: Report of Field Density Tests Proposed Townhouse Building 2677 State Street Carlsbad, California 92008 September 24, 2018 Project No. 18-1106D5 References: 1. "Transfer of Geotechnical Responsibility, Geotechnical Engineer of Record, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18-1106D5, Prepared by East County Soil Consultation and Engineering, Inc., Dated July 16, 2018. 2. "Geotechnical Investigation, Proposed Townhouse Building, 2677 State Street, Carlsbad, California", Project No. 8436.1, Log No. 19513, Prepared by Heatherington Engineering, Inc., Dated November 3, 2017. Dear Mr. Benjamin: This is to present the results of field density tests performed on the building pad for the proposed townhouse building at the subject site. In accordance with your request, in-place field density tests were performed in accordance with ASTM D1556 (Sand Cone Method). Grading was conducted between August 15, 2018 and September 17, 2018 under the observation and testing of a representitive of East County Soil Consultation & Engineering Inc. The results of the field density tests are presented on Page T-1 under "Table of Test Results". The laboratory determinations of the maximum dry densities and optimum moisture contents of the fill soils are set forth on Page L-1 under "Laboratory Test Results". The approximate test locations are shown on Plate No. 1. Following clearing and grubbing, i.e. the removal of concrete waste and debris from the demolition of the existing building, subgrade soils were overexcavated to a minimum depth of 6 feet below finished pad grade into the dense terrace deposits. Prior to the placement of new fill, the bottom of the excavation was scarified to a depth of approximately 12 inches, moisture- ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO. 18-1 !06D5 conditioned and compacted. Slot cutting and backfilling was performed along the southern and western property lines. On-site and imported fill soils cons1stmg of silty sand were placed in thin lifts, moisture- conditioned around optimum and compacted in excess of 90 percent relative compaction. Compaction was achieved with the use of a Caterpillar 320C backhoe and a sheepsfoot roller. Based on our field observations and density test results, it is our opinion that the grading operation for the proposed townhouse building was performed in accordance with the referenced geotechnical report (Reference No. 2) and local grading ordinances. If we can be of further assistance, please do not hesitate to contact our office. Pages T-1 , L-1 and Plate No. 1 are attached. Respectfully Submitted, Mamadou Saliou Diallo, P .E. RCE 54071, GE 2704 MSD/md 2 TEST SOIL NO. TYPE 1 1 2 1 3 2 4 2 5 2 6 2 7 3 8 3 9 1 10 3 11 3 12 3 13 3 14 3 15 2 16 2 17 2 18 4 19 4 20 4 21 4 22 4 23 5 24 5 25 5 ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO. 18-1106D5 DEPTH OFFILL IN FEET 2 4 2 4 2 4 2 4 2 2 4 2 4 2 2 2 2 4 4 4 2 4 2 4 2 PAGE T-1 TABLE OF TEST RESULTS ASTMD1556 MAXIMUM FIELD DRY DRY MOISTURE DENSITY DENSITY %DRY WT. P.C.F. P.C.F 9.0 124.9 132.0 8.8 129.6 132.0 9.8 125.8 133.5 9.6 128.0 133.5 7.7 122.6 133.5 9.2 123.7 133.5 8.1 121.9 129.0 9.6 120.6 129.0 8.1 126.8 132.0 10.2 127.1 129.0 9.9 117.7 129.0 8.4 118.5 129.0 9.6 125.0 129.0 7.1 122.2 129.0 9.1 128.7 133.5 9.6 129.5 133.5 8.6 126.3 133.5 11.3 115.1 119.0 8.9 113.1 119.0 9.1 117.7 119.0 10.4 115.9 119.0 11.1 112.9 119.0 7.6 115.1 127.0 9.2 122.6 127.0 9.0 119.2 127.0 3 PERCENT COMPACTION 95 98 94 96 92 93 95 94 96 99 91 92 97 95 96 97 95 97 95 99 94 95 91 97 94 REMARKS ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO. !8-1106D5 DEPTH PAGE T-1 (Continued) TABLE OF TEST RESULTS ASTMD1556 MAXIMUM FIELD DRY DRY TEST SOIL OF FILL MOISTURE DENSITY DENSITY PERCENT NO. TYPE IN FEET %DRY WT. P.C.F. P.C.F COMPACTION 26 5 4 9.0 120.8 127.0 95 27 5 2 7.4 117.6 127.0 93 28 5 4 9.2 121.2 127.0 95 29 6 6FG 7.3 126.2 133.0 95 30 6 6FG 9.0 129.5 133.0 97 31 6 6FG 7.9 123.1 133.0 93 32 6 6FG 8.2 120.6 133.0 91 33 7 6FG 7.2 118.3 130.0 91 34 7 6FG 6.9 119.7 130.0 92 FG = FINISH GRADE 4 REMARKS ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO.18-1106D5 PAGE L-1 LABORATORY TEST RESULTS RESULTS OF MAXIMUM DENSITY AND OPTIMUM MOISTURE The maximum dry densities and optimum moisture contents of the fill materials as determined by ASTM Dl557, Procedures A and B which use 25 blows of a 10-pound slide hammer falling from a height of 18 inches on each of 5 equal layers in a 4-inch diameter 1/30 cubic foot compaction cylinder and Procedure C which uses 56 blows of a 10-pound slide hammer falling from a height of 18 inches on each of 5 equal layers in a 6-inch diameter 1/13.3 cubic foot compaction cylinder are presented as follows: SOIL TYPE/ PROCEDURE DESCRIPTION 1/A DARKBROWNS~TYSAND 2/A DARK BROWN SILTY SAND (IMPORT) 3/A REDDISH BROWN S~TY SAND (IMPORT) 4/A LIGHT BROWN S~TY SAND (IMPORT) 5/A TAN BROWN SILTY SAND (IMPORT) 6/A DARK BROWN S~TY SAND (IMPORT) 7/A REDDISH BROWN SILTY SAND (IMPORT) 5 MAXIMUM DRY DENSITY LB/ CU. FT. 132.0 133.5 129.0 119.0 127.0 133.0 130.0 OPTIMUM MOISTURE CONTENT %DRY WT. 8.0 8.1 9.1 8.5 9.0 8.5 9.5 EAST COUNTY SOIL CONSULTATION AND ENGINEERING, INC. 10925 HARTLEY ROAD, SillTE "I" SANTEE, CALIFORNIA 92071 (619) 258-7901 Fax 258-7902 Mark Benjamin Archipelago Development P.O. Box 7050 Rancho Santa Fe, California 92067 Subject: Report of Field Density Tests Waterline Trench Backfill Proposed Townhouse Building 2677 State Street Carlsbad, California 92008 References: See Attached Dear Mr. Benjamin: February 7, 2019 Project No. 18-1106D5 This report presents the results of field density tests performed on the waterline trench backfill on State Street, including the subgrade and aggregate base at the subject site. In accordance with your request, in-place field density tests were performed in accordance with ASTM D1556 (Sand Cone Method). Backfill was conducted on January 8 and 29, 2019 under the observation and testing of a representative of East County Soil Consultation and Engineering, Inc. The results of the field density tests are presented on Page T-1 under "Table of Test Results". The laboratory determinations of the maximum dry densities and optimum moisture contents of the different materials are set forth on Page L-1 under "Laboratory Test Results". On-site and imported materials were placed in thin lifts and compacted to the minimum required of 90 and 95 percent relative compaction while maintaining a moisture content around optimum. Compaction was achieved with the use of a sheepsfoot roller and a hand whacker. ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO. 18-1106D5 If we can be of further assistance, please do not hesitate to contact our office. Pages T-1, L-1 and Plate No. 1 are attached. Respectfully Submitted, Mamadou Saliou Diallo, P .E. RCE 54071, GE 2704 MSD/md 2 TEST SOIL NO. TYPE 1 1 2 1 3 2 4 2 5 1 6 1 7 3 8 2 9 1 10 4 11 1 12 4 13 4 14 4 15 2 16 5 17 5 18 1 19 1 ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO.18-1106D5 DEPTH OFFILL IN FEET 2 4 1 1 2 3 4 5 5 2 SG SG AB AB 2 SG AB 2 4 PAGE T-1 TABLE OF TEST RESULTS ASTMD1556 MAXIMUM FIELD DRY DRY MOISTURE DENSITY DENSITY %DRY WT. P.C.F. P.C.F 13.2 119.8 132.0 6.7 123.1 132.0 8.8 121.7 135.0 10.6 127.0 135.0 8.8 121.7 132.0 11.1 126.5 132.0 14.9 116.4 124.0 5.2 131.8 135.0 10.1 124.8 132.0 8.6 123.6 125.5 9.5 125.8 132.0 10.5 124.3 125.5 9.1 122.8 125.5 11.8 121.1 125.5 8.3 130.5 135.0 14.7 116.8 123 .0 12.6 118.9 123 .0 9.8 123.6 132.0 10.2 124.1 132.0 PERCENT COMPACTION 91 93 90 94 92 96 94 98 95 98 95 99 98 97 97 95 97 94 94 SG = SUBGRADE AB = AGGREGATE BASE 3 REMARKS ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO.18-1106D5 PAGEL-1 LABORATORY TEST RESULTS RESULTS OF MAXIMUM DENSITY AND OPTIMUM MOISTURE The maximum dry densities and optimum moisture contents of the fill materials as determined by ASTM Dl557, Procedures A and B which use 25 blows of a IO-pound slide hammer falling from a height of 18 inches on each of 5 equal layers in a 4-inch diameter 1/30 cubic foot compaction cylinder and Procedure C which uses 56 blows of a 10-pound slide hammer falling from a height of 18 inches on each of 5 equal layers in a 6-inch diameter 1/13.3 cubic foot compaction cylinder are presented as follows: SOIL TYPE/ PROCEDURE DESCRIPTION 1/A DARK BROWN SILTY SAND 2/ A GRAYISH BROWN SIL TY SAND (IMPORT) 3/ A GRAYISH BROWN CLAYEY SAND 4/C RECYCLED AGGREGATE BASE (IMPORT) SIC RECYCLED AGGREGATE BASE (IMPORT) 4 MAXIMUM DRY DENSITY LB/ CU. FT. 132.0 135.0 124.0 125.5 123.0 OPTIMUM MOISTURE CONTENT %DRY WT. 9.0 7.0 11.3 9.5 12.3 ARCHIPELAGO DEVELOPMENT/ 2677 STATE STREET PROJECT NO.18-1106D5 REFERENCES 1. "Foundation Excavation Observation, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18-1106D5, Prepared by East County Soil Consultation and Engineering, Inc., Dated October 8, 2018. 2. "Report of Field Density Tests, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18-110605, Prepared by East County Soil Consultation and Engineering, Inc., Dated September 24, 2018. 3. "Transfer of Geotechnical Responsibility, Geotechnical Engineer of Record, Proposed Townhouse Building, 2677 State Street, Carlsbad, California 92008", Project No. 18- 1106D5, Prepared by East County Soil Consultation and Engineering, Inc., Dated July 16, 2018. 4. "Geotechnical Investigation, Proposed Townhouse Building, 2677 State Street, Carlsbad, California", Project No. 8436.1, Log No. 19513, Prepared by Heatherington Engineering, Inc., Dated November 3, 2017. 5