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Home My WebLink AboutCDP 2017-0001; PRITCHARD RESIDENCE; FINAL SOILS REPORT; 2020-12-04 Project No 165692-1,4 Date: January 8, 2021 To: Robert and Cathy Pritchard 5098 Shore Drive Carlsbad, California Re: Proposed New Residence to be located at 5098 Shore Drive, Carlsbad, California. Subject: Final Summary Letter Grading Plan Drawing No. 506-5A Ref: 1. Geotechnical Investigation & Foundation Recommendations Proposed New Residence to be Located at 5098 Shore Drive, Carlsbad, California, prepared by Engineering Design Group, dated December 23rd, 2016. Project No. 165692-1 2. Plan Review Letter, prepared by Engineering Design Group, dated January 15, 2018. 3. Updated Plan Review Letter, prepared by Engineering Design Group, dated January 31st, 2019 4. Compaction report, prepared by Engineering Design Group, dated September 17, 2019. 5. Basement Subgrade Letter, prepared by Engineering Design Group, dated May 31, 2019. 6. Basement Footing observation letter, prepared by Engineering Design Group, dated June 12, 2019. 7. Sump Pump Excavation Backfill Report, prepared by Engineering Design Group, dated June 24, 2019. 8. Footing Observation Letter, prepared by Engineering Design Group, dated August 22, 2019. 9. Driveway Subgrade Compaction Letter, dated December 4, 2020, prepared by Engineering Design Group. 10. Summary Letter dated November 13, 2020, prepared by Engineering Design Group. We have prepared this revised final summary letter, as requested by City of Carlsbad inspector as part of project completion. Onsite quality control services, provided by Engineering Design Group, are summarized in the above referenced reports and inspections summaries. In our opinion the geotechnical conditions of the project are in general conformance with the recommendations of the project soils report, referenced above. Respectfully Submitted, ENGINEERING DESIGN GROUP Steve Norris Erin E. Rist GE #2590 RCE #65122 Attachments: 1. Driveway Compaction Report with Test Results and Figures 2. Compaction Report with Test Results and Figures 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 EDG Project No. 165692-4 Date: December 4, 2020 To: Robert and Kathy Pritchard 5098 Shore Drive Carlsbad, California Re: New Residence to be located at 5098 Shore Drive, Carlsbad, California Subject: Driveway Subgrade Compaction Summary – City of Carlsbad Ref: 1. Compaction Report, prepared by Engineering Design Group, dated September 17, 2019. As requested by City of Carlsbad, we have prepared this compaction summary letter based upon our recent limited field density testing at driveway and driveway approach at the subject site. Onsite material was utilized for driveway subgrade. Onsite material was ripped to a minimum depth of 12 inches and recompacted utilizing a mechanized whacker. Limited field density tests were performed in accordance with D2922 (Nuclear Gauge Method). Our test results indicate that, in the locations tested, soils have been compacted to at least 90% relative compaction, as determined by ASTM D1557, (Procedure A). The reported test results are representative of the soil conditions at the locations tested. Sincerely, Engineering Design Group Erin Rist California RCE 65122 Attachments: 1) Table 1 & 2 “Laboratory and Field Test Results” 2) Figure 1: “Approximate Location of Compaction Tests” ENGINEERING DESIGN GROUP www.rJesigngroupcn.com 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 EDG Project No. 165692 - 4 LABORATORY AND FIELD TEST RESULTS TABLE NO. 1 Laboratory Test Results SOIL TYPE (#) SOIL TYPE MAXIMUM DENSITY (PCF) OPTIMUM MOISTURE (%) U.S.C.S. CLASSIFICATION 1 Light brown to brown, silty sand ONSITE 122.4 9.5 SW-SM 2 Light brown to brown silty sand/sandy silt IMPORT 117.5 11.3 SW - SM TABLE NO. 2 Field Test Results TEST NO. DATE ELEVATION SOIL TYPE DRY DENSITY (PCF) FIELD MOISTURE (%) RELATIVE COMPACTION (%) COMMENT 1 10/1/2020 SG 1 110.2 12.3 90 2 10/1/2020 SG 1 110.6 11.4 90 3 10/1/2020 SG 1 111.6 10.5 91 4 10/1/2020 SG 1 111.4 11.1 91 FIGURE 2 Approximate Location of Compaction Test Project: Pritchard ResidenceAddress: 5098 Shore Drive, Carlsbad, California EDG Project No:165692-4 ●1 ●3 ●2 ●4 NOT TO SCALE ENGINEERING DESIGN GROUP www.designgroupca.com / -,--\ / 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 I ~ \. '5J ✓ EDG JOB NO. 165692-1,4 Date: September 17, 2019 To: Robert and Cathy Pritchard 5098 Shore Drive Carlsbad, California Re: Proposed New Residence to be Located at 5098 Shore Drive, Carlsbad, California. Subject: Compaction Report – Rough Grading and Basement Wall Backfill. Reference: 1. Geotechnical Investigation and Foundation Recommendations Proposed New Residence to be Located at 5098 Shore Drive, Carlsbad California, prepared by Engineering Design Group, dated December 23, 2016. 2. Grading Plan No. GR2017-0048 INTRODUCTION In accordance with your request and authorization we have provided limited earthwork observation and compaction testing services during the construction of the proposed single family residence. At the time of this report, site construction is not complete and ongoing work is anticipated. The scope of site construction summarized includes basement excavations, installation and backfill of pump chambers, backfill of site retaining walls and removal and recompaction in the area of new residence and garage outside of the building footprint. The results of our limited quality control and compaction testing operations are summarized below. We understand the proposed improvements include a new two-story residence with basement, attached garage and typical landscape and hardscape improvements. GRADING OPERATIONS The scope of operations for this project consisted of the placement and compaction of basement wall backfill for the new single-family residence and preparation of building pad for attached garage and those portions of the building that extend beyond the basement. Rough grading operations at the subject site were conducted during June, August and September 2019. In the areas of the new basement walls, onsite soils and import soils were utilized for backfill material. Soil was moisture conditioned, placed and recompacted in place. In the areas of building pad preparation, onsite soil was utilized as fill material. At new building footprint, beyond the retaining wall, the upper 3-5 feet of existing weathered and fill materials were removed to competent material, removal bottom ripped and moisture conditioned, and fill materials recompacted. Onsite soil consisted of a range of light brown to brown, silty sands. Import material consisted of light brown to brown, silty sands and sandy silts. Prior to placement, soils were cleaned of vegetative material and debris and 2121 Montiel Road, San Marcos, CA 92069 760.839 7302 EDG JOB NO. 165692-1,4 moisture conditioned. Based upon our visual observation onsite and import soils possess potential for expansion in the low range. Soil was moisture conditioned with a fire hose and placed utilizing a Bobcat, Volvo PE5 roller and mechanized wacker. FIELD AND LABORATORY TESTING Limited field density tests were performed in accordance with D2922 (Nuclear Gauge Method). Our test results indicate that, in the locations tested, soils have been compacted to at least 90% relative compaction, as determined by ASTM D1557, (Procedure A). The reported test results are representative of the soil conditions at the locations tested. Our observation and field density testing methods are in accordance with normally accepted procedures. The accuracy of the relative compaction values is subject to the precision limitations of the ASTM test methods. The accuracy of the maximum dry density determination (ASTM D1557) is discussed in the Annual Book of ASTM Standards, Section 4, Volume 04.08, entitled, Soil and Rock; Building Stones. Variations of relative compaction values should be expected, laterally and vertically, from actual test locations. TESTING SUMMARY In general, it is our opinion, based on the placement procedure and the test data collected, the fill soils tested, at the locations tested, were compacted to a minimum of 90% relative compaction (based on ASTM D1557, Procedure A). If you have any questions regarding this report, or if we can be of further service, please do not hesitate to contact us. We hope the report provides you with the necessary information to continue with the development of the project. Sincerely, ENGINEERING DESIGN GROUP Erin Rist Steven B. Norris California RCE# 65122 California GE# 2590 Attachments: 1) Table 1 & 2: “Laboratory and Field Test Results” 2) Figure 1: “Approximate Location of Compaction Tests” EDG JOB NO. 165692-1,4 LABORATORY AND FIELD TEST RESULTS TABLE NO. 1 Laboratory Test Results SOIL TYPE (#) SOIL TYPE MAXIMUM DENSITY (PCF) OPTIMUM MOISTURE (%) U.S.C.S. CLASSIFICATION 1 Light Brown to Brown Silty Sand ONSITE 122.7 5.4 SW - SM 2 Light Brown to Brown Silty Sand/Sandy Silt IMPORT 117.5 11.3 SW - SM TABLE NO. 2 Field Test Results TEST NO. DATE ELEVATION SOIL TYPE DRY DENSITY (PCF) FIELD MOISTURE (%) RELATIVE COMPACTION (%) COMMENT 1 6/13/2019 29.8' 1 110.1 5.6 90 2 6/13/2019 29.8' 1 110.7 6.0 90 3 6/19/2019 FG 1 106.7 5.5 87 RETEST 4 4 6/19/2019 FG 1 110.9 5.8 90 5 8/2/2019 BTM +2' 1 114.2 7.2 94 6 8/2/2019 BTM +2' 1 107.5 8.9 88 RETEST 8 7 8/2/2019 BTM +2' 1 118.5 8 97 8 8/2/2019 BTM +2' 1 111.6 6.9 91 9 8/2/2019 BTM +2' 1 121.8 6.2 100 10 8/2/2019 BTM +2' 1 118.7 8.0 97 11 8/6/2019 BTM +2' 1 118.6 7.1 97 12 8/6/2019 BTM +2' 1 117.8 7.6 96 13 8/6/2019 BTM +4' 1 119.2 7.1 97 14 8/6/2019 BTM +4' 1 124.9 6.8 102 15 8/6/2019 BTM +2' 1 122.6 7.9 100 16 8/6/2019 BTM +2' 1 123.0 9.0 101 17 8/6/2019 BTM +4' 1 120.9 6.5 99 18 8/6/2019 BTM +4' 1 123.2 7.6 101 19 8/6/2019 BTM +2' 1 111.6 6.0 91 20 8/6/2019 BTM +2' 1 116.0 6.5 95 21 8/6/2019 BTM +4' 1 125.8 9.3 103 EDG JOB NO. 165692-1,4 TEST NO. DATE ELEVATION SOIL TYPE DRY DENSITY (PCF) FIELD MOISTURE (%) RELATIVE COMPACTION (%) COMMENT 22 8/6/2019 BTM +4' 1 120.9 9.1 99 23 8/6/2019 BTM +4' 1 116.2 9.3 96 24 8/7/2019 BTM +6' 1 123.8 6.7 101 25 8/7/2019 BTM +6' 1 125.5 8.2 103 26 8/7/2019 BTM +6' 1 117 6.5 96 27 8/7/2019 BTM +6' 1 122.5 7.5 100 28 8/7/2019 BTM +4' 1 125.3 7.9 102 29 8/7/2019 BTM +4' 1 124.7 8.6 102 30 8/7/2019 BTM +6' 1 124.7 7.1 102 31 8/7/2019 BTM +6' 1 121.1 7.0 99 32 8/8/2019 FG 1 119.6 7.4 98 33 8/8/2019 FG 1 121.0 7.7 99 34 8/8/2019 FG 1 122.2 6.8 100 35 8/8/2019 FG 1 122.6 7.7 100 36 8/8/2019 FG 1 121.2 7.7 99 37 8/8/2019 FG 1 112,6 8.7 92 RETEST 40 38 8/8/2019 FG 1 122.2 6.4 100 39 8/8/2019 FG 1 123.1 7.1 101 40 8/8/2019 FG 1 118.0 7.0 96 41 8/13/2019 FG 1 122.2 6.4 100 42 8/13/2019 FG 1 122.5 8.1 100 43 8/13/2019 FG 1 122.7 7.1 100 44 8/13/2019 FG 1 119.8 6.1 98 45 8/13/2019 FG 1 121.2 5 99 46 8/13/2019 FG 1 121.1 6.8 99 47 8/15/2019 BTM +4' 2 106.8 11.8 91 48 8/15/2019 BTM +4' 2 105.9 14.2 90 49 8/21/2019 BTM +6' 2 105.9 14 90 50 8/21/2019 BTM +6' 2 107.1 12.4 91 51 9/6/2019 BTM +6' 2 107.1 11.6 91 52 9/6/2019 BTM +6' 2 104.4 13.1 93 53 9/9/2019 FG 1 119.9 6.8 98 54 9/9/2019 FG 1 117.0 7.1 96 FIGURE 1 Approximate Location of Compaction Test Project: Pritchard ResidenceAddress: 5098 Shore Drive, Carlsbad, California EDG Project No:165692-1,4 ●1●3 ●5 ●2●4 NOT TO SCALE ●13 ●12●11 ●10 ●9 ●8 ●7 ●6 ●14 ●15 ●16 ●17 ●18 ●19●20 ●21 ●22 ●23 ●24 ●25 ●26 ●27 ●28●29 ●30 ●31 ●32 ●33 ●34 ●35 ●36 ●37 ●38●39 ●40 ●41 ●42 ●43 ●44 ●45 ●46 ●47●48 ●49 ●50 ●51●52 ●53●54 ENGINEERING DESIGN GROUP www.designgroupca.com 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 L, I I I I r----------.J I I I I I I I I -~--__ J I I I I L-----