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Home My WebLink AboutPD 2019-0009; 2700 ARGONAUTA RESIDENCE; FINAL SOILS REPORT; 2022-12-13 Project No 175864-1,5,4 Date: December 13th, 2022 To: Keith Webster 1460 Orpheus Avenue Encinitas, California 92024 Re: Proposed new residence to be located at (APN: 215-460-05) Argonauta Street, Carlsbad, California Subject: Addendum Letter to Compaction Report Ref: 1. “Preliminary Geotechnical Investigation & Foundation Recommendations Proposed New Residence to be Located at (APN: 215-460-05) Argonauta Street, Carlsbad, California”, prepared by Engineering Design Group, dated January 4th, 2019. 2. “Compaction Report – Rough Grading, proposed new residence to be located at (APN: 215-460-05) Argonauta Street, Carlsbad, California”, Prepared by Engineering Design Group, dated August 1, 2022. 3. “Grading Plan for Residence to be located at (APN:215-460-05) Argonauta Street, Carlsbad, California”, Drawing No. 517-6A, prepared by Engineering Design Group, dated March 19, 2020. We have prepared this addendum letter, to provide additional information regarding the above referenced compaction report (Reference No. 2), as part of project completion. Onsite quality control services, provided by Engineering Design Group, are summarized in the above referenced compaction report. It is our opinion the geotechnical conditions of the project, as summarized in the compaction report, are in general conformance with the recommendations of the preliminary geotechnical report and the grading plans (DWG 517-6A), referenced above. Respectfully Submitted, ENGINEERING DESIGN GROUP Steve Norris RCE #47672 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 o. 4767c p. 12-31-23 i\. ~~ ~LI~ I) Project No 175864-1,5,4 Date: December 13th, 2022 To: Keith Webster 1460 Orpheus Avenue Encinitas, California 92024 Re: Proposed new residence to be located at (APN: 215-460-05) Argonauta Street, Carlsbad, California Subject: Addendum Letter to Compaction Report Ref: 1. “Preliminary Geotechnical Investigation & Foundation Recommendations Proposed New Residence to be Located at (APN: 215-460-05) Argonauta Street, Carlsbad, California”, prepared by Engineering Design Group, dated January 4th, 2019. 2. “Compaction Report – Rough Grading, proposed new residence to be located at (APN: 215-460-05) Argonauta Street, Carlsbad, California”, Prepared by Engineering Design Group, dated August 1, 2022. 3. “Grading Plan for Residence to be located at (APN:215-460-05) Argonauta Street, Carlsbad, California”, Drawing No. 517-6A, prepared by Engineering Design Group, dated March 19, 2020. We have prepared this addendum letter, to provide additional information regarding the above referenced compaction report (Reference No. 2), as part of project completion. Onsite quality control services, provided by Engineering Design Group, are summarized in the above referenced compaction report. It is our opinion the geotechnical conditions of the project, as summarized in the compaction report, are in general conformance with the recommendations of the preliminary geotechnical report and the grading plans (DWG 517-6A), referenced above. Respectfully Submitted, ENGINEERING DESIGN GROUP Steve Norris RCE #47672 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 o. 4767c p. 12-31-23 i\. ~~ ~LI~ I) Date: August 1, 2022 To: Keith Webster 1460 Orpheus Avenue Encinitas, California Re: Proposed new residence to be located at (APN: 215-460-05) Argonauta Street, Carlsbad, California. Subject: Compaction Report – Rough Grading INTRODUCTION In accordance with your request and authorization we have provided limited earthwork observation and compaction testing services during the rough grading at the above referenced site. The results of our limited quality control and compaction testing operations are summarized below. We understand the proposed improvements include the construction of a new single- family residence, driveway, and typical landscape and hardscape improvements. GRADING OPERATIONS The scope of our testing associated with rough grading operations for this project generally consisted of, and is limited to, backfilling of basement/building retaining walls, and site retaining walls at the driveway. Rough grading at the subject site was conducted during December 2020, January, April, May 2021, March, April 2022. Onsite and import soil was utilized as graded backfill. Onsite soils consisted of brown silty sand and sandy silt with gravels. Based upon visual observation, onsite materials possess a low potential for expansion. Import soil consisted of light brown, sandy silts and silty sands. Based upon lab results provided by Superior Materials Company, import soils possess a low potential for expansion. Prior to re-compaction, soils were generally cleaned of vegetative and other debris and moisture conditioned. Soil was moisture conditioned with a fire hose and placed utilizing a combination of CAT excavator, remote controlled sheep foot roller, and handheld mechanized whackers. 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 ENGINEERING DESIGN GROUP www.designgroupca.com 2121 Montiel Road, San Marcos, CA 92069 760.839.7302 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” 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 Brown Silty Sand/Sandy Silt W/Gravels 119.5 11.9 SW - SM 2 Light Brown Silty Sand/Sandy Silt IMPORT* 125.0 11.0 SW - SM * Soil and lab results provided by Superior Materials Company. TABLE NO. 2 Field Test Results TEST NO. DATE ELEVATION (FT) SOIL TYPE (#) DRY DENSITY (PCF) FIELD MOISTURE (%) RELATIVE COMPACTION (%) COMMENT 1 12/22/2020 TOW - 2 1 115.8 9.9 97 2 12/22/2020 TOW - 2 1 115.6 8.9 97 3 12/22/2020 TOW - 2 1 113.5 9.4 95 4 12/22/2020 TOW - 2 1 111.2 10.5 93 5 12/22/2020 TOW - 2 1 113.8 14.6 95 6 12/22/2020 TOW - 2 1 115.5 13.1 97 7 12/22/2020 TOW - 2 1 110.6 11.6 93 8 12/22/2020 TOW - 2 1 115.3 10.6 96 9 1/5/2021 FG 1 109.0 14.5 91 10 1/5/2021 FG 1 115.3 10.6 96 11 1/5/2021 FG 1 110.0 15.6 92 12 1/5/2021 FG 1 103.7 15.6 87 RETEST 13 13 1/5/2021 FG 1 114.1 11.6 95 TEST NO. DATE ELEVATION (FT) SOIL TYPE (#) DRY DENSITY (PCF) FIELD MOISTURE (%) RELATIVE COMPACTION (%) COMMENT 14 1/5/2021 FG 1 110.9 12.3 93 15 1/5/2021 FG 1 103.4 12.6 87 RETEST 16 16 1/5/2021 FG 1 112.6 15.0 94 17 1/5/2021 FG 1 108.2 9.9 91 18 1/5/2021 FG 1 110.2 12.2 92 19 4/28/2021 TOW - 5 1 118.1 7.7 99 20 4/28/2021 TOW - 5 1 111.8 8.3 94 21 5/4/2021 TOW - 3 2 116.2 12.5 93 22 5/4/2021 TOW - 3 2 113.5 11.2 91 23 5/4/2021 TOW - 3 2 115.3 11.4 92 24 5/6/2021 FG 2 119.0 13.5 95 25 5/6/2021 FG 2 118.7 13.2 95 26 5/6/2021 FG 2 124.1 11.0 99 27 5/6/2021 FG 2 118.1 12.8 95 28 3/30/2022 BTM + 2 2 112.0 14.6 90 29 3/30/2022 BTM + 2 2 114.0 13.7 91 30 3/31/2022 BTM + 4 2 115.6 13.7 93 31 3/31/2022 BTM + 4 2 113.0 13.4 90 32 4/4/2022 BTM + 6 2 115.1 14.5 92 33 4/4/2022 BTM + 6 2 110.5 15.0 88 RETEST 34 34 4/4/2022 BTM + 6 2 112.2 14.6 90 35 4/19/2022 FG 2 112.1 11.2 90 36 4/19/2022 FG 2 116.1 10.9 93 FIGURE 1 Approximate Location of Compaction Test Project: Webster Residence Address: APN: 215-460-05 Argonauta Street, Carlsbad, California EDG Project No:175864 -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 Retaining Wall Not Constructed ENGINEERING DESIGN GROUP \ \ www.designgroupca.com \ \ \ \ \ \ TW-<~\ n;-f9J.O 51)-ZJ 7F-t90.7 ~ ' TW• Fe-< .. 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