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Home My WebLink About23-5420 Compaction Report 41655 Reagan Way Ste. E Murrieta,CA.92562 nland En ineerin Technolo ies Fa (951) 894-6491 g � 'nc. Fax: (951) 894-6491 October 4,2023 Project No. 23-5420 Mr. Dave Plante Colorado West Construction,Inc. 25780 Washington Avenue Murrieta, CA 92562 Subject: Compaction Report for The Dutch Bros. Building Pad Located at 32250 Mission Trail, City of Lake Elsinore, County of Riverside, California. Reference: In accordance with your request and authorization, Inland Engineering Technologies Inc. (IET) has provided geotechnical services during the backfilling operations for The Dutch Bros. Building Pad Located at 32250 Mission Trail, City of Lake Elsinore, County of Riverside, California. The accompanying as-graded report summarizes our observations, field and laboratory test results, and the geotechnical conditions encountered during the backfilling operations at the subject site. Grading operations for the proposed building pad were performed in general accordance with geotechnical recommendations made during the course of grading,the referenced geotechnical report, and the City of Lake Elsinore grading requirements. If you have any questions regarding our report, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, INLAND ENGINEERING TECHNOLOGIES,INC. Q,?,oFESS/o�q �Q�PQp,N YOG��2 Cr W28 vD EXP G es Worley ' Yogi Pirathapan GE 2834 s�9r07F cANFo��\P President Geotechnical Engineer TABLE OF CONTENTS Section Page 1.0 INTRODUCTION...........................................................................................................................2 2.0 SUMMARY OF FIELD OPERATIONS........................................................................................2 2.1 Site Preparation....................................................................................................................2 2.2 Fill Placement.......................................................................................................................2 2.3 Laboratory Testing...............................................................................................................3 2.4 Field Density Testing ...........................................................................................................3 3.0 CONCLUSIONS AND RECOMMENDATIONS..........................................................................3 4.0 LIMITATIONS...............................................................................................................................4 LIST OF TABLES.APPENDICES,AND ILLUSTRATIONS Tables Table 1 —Maximum Dry Density and Optimum Moisture Content Appendices Appendix A—Summary of Field Density Test Results 1.0 INTRODUCTION In accordance with your request and authorization, IET has performed geotechnical observation and testing services for The Dutch Bros. Building Pad Located at 32250 Mission Trail, City of Lake Elsinore, County of Riverside, California. The grading operations involved removal and recompaction for the proposed building pad. The earthwork operations during removal and recompaction were observed and tested under the supervision from a representative of IET. This as-graded report summarizes our geotechnical observations, field and laboratory test results and the geotechnical conditions encountered during the grading operations on the site. In addition,this report provides conclusions and recommendations for the proposed pad. The grading plan prepared by the Project Civil Engineer was utilized as a base map for the field density tests within the limits of the grading. The grading was performed by CWC Inc. IET was not responsible for line and grade. 2.0 SUMMARY OFAS-GRADED CONDITIONAND FIELD OPERATIONS Grading work began and finished in September 2023. Grading operations included: 1) removal of surficial potentially compressible soils down to competent alluvium and 2)placement of compacted fill soils to design grade. Z I Site Preparation Prior to grading, the existing debris and vegetation were removed and disposed off the site. Undocumented fill, topsoil, and alluvium were removed down to competent material which generally consists of competent alluvium. The maximum depth of remedial removals, which was approximately 5 feet below the existing grade, was performed at the proposed building location. The removals were made generally 5 feet outside the footprint of the proposed pad. Following remedial removals, the removal bottoms were approved by IET. Areas to receive fill were scarified a minimum of 6 inches, moisture-conditioned as needed to obtain a near-optimum moisture content and compacted to a minimum 90 percent relative compaction, as determined by ASTM Test Method D1557. 2.2 Fill Placement After processing the areas to receive fill, native soils were generally spread in approximately 8-inch lifts, moisture-conditioned as needed to attain near-optimum moisture content and compacted to at least 90 percent of the maximum dry density in accordance with ASTM Test Method D1557. Compaction was achieved by use of heavy-duty construction equipment. Areas of fill in which either field density tests indicated less than 90 percent relative compaction or the soils exhibited nonuniformity and/or showed an inadequate or excessive moisture content, were reworked, recompacted, and retested until a minimum 90 percent relative compaction and near-optimum moisture content was achieved. Project No. 23-5420 Page 2 October 4, 2023 2.3 Laboratory Testing Laboratory maximum dry density tests of representative onsite soils were performed in general accordance with ASTM D1557. The results of these tests are presented in the table below. Table I—Maximum Dry Density and Optimum Moisture Content SAMPLE MAXIMUM OPTIMUM LOCATION SAMPLE DESCRIPTION DRYDENSITY MOISTURE (PCF) CONTENT(%) Cl Building Pad Silty Sand with Gravel 128.5 8.5 2.4 Field Density Testin Field density testing was performed using the Nuclear-Gauge Method (ASTM Test Methods D2922- 96 and D3017-96). The results of the field density tests are summarized in Appendix A. The field density testing was performed in general accordance with the applicable ASTM standards and the current standard of care in the industry. In-situ soil density testing is intended to verify the effectiveness of the earthmoving operation in general and is performed on a spot-check basis; as such, some variations in relative compaction should be expected from the results documented herein. 3.0 CONCL USIONS AND RECOMMENDATIONS Grading operations for the proposed building pad were performed in general accordance with the geotechnical recommendations made during the course of grading, the referenced geotechnical report, and the City of Lake Elsinore requirements. It is our professional opinion that the subject building pad is suitable for its intended commercial use from a geotechnical engineering standpoint, provided proper landscaping, irrigation, and maintenance programs are implemented. Provided that the recommendations in this report, and all relevant reports referenced herein, are implemented, it is IET's opinion that the completed grading at the subject site will be safe from landslide, settlement, and/or slippage. Grading will not adversely affect the stability of off-site development. Project No. 23-5420 Page 3 October 4, 2023 4.0 LIMITATIONS Our services were performed using the degree of care and skill ordinarily exercised, under similar circumstances, by reputable engineers and geologists practicing in this or similar localities. No other warranty, expressed or implied, is made as to the conclusions and professional advice included in this report. The samples taken and submitted for laboratory testing, the observations made and the in-situ field testing performed are believed representative of the entire project; however, soil and geologic conditions revealed by excavation may be different than our preliminary findings. If this occurs, the changed conditions must be evaluated by the project soils engineer and geologist and design(s) adjusted as required or alternate design(s)recommended. This report is issued with the understanding that it is the responsibility of the owner, or of his/her representative, to ensure that the information and recommendations contained herein are brought to the attention of the architect and/or project engineer and incorporated into the plans, and the necessary steps are taken to see that the contractor and/or subcontractor properly implements the recommendations in the field. The contractor and/or subcontractor should notify the owner if they consider any of the recommendations presented herein to be unsafe. The findings of this report are valid as of the present date. However, changes in the conditions of a property can and do occur with the passage of time, whether they be 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 partially by changes outside our control. Project No. 23-5420 Page 4 October 4, 2023 APPENDIX A Summa!y of Field Density Test Results TABLE 1 SUALH"YOFFIELD DENSITY TESTS Test Test Test Elevation Type Soil Dry Moisture Max. Rel. Date (feet) Test No. Test Location Density Content Density, Comp. of Type (pcf) {gb) (pcf) (%) 1 N 09/28/23 Cr BUILDING PAD -4 Cl 116.5 9.5 128.5 91 2 N 09/28/23 CF BUILDING PAD -4 Cl 117.2 9.3 128.5 91 3 N 09/28/23 CF BUILDING PAD -Z CI 115.2 9.4 128.5 90 4 N 09/29/23 CF BUILDING PAD -2 Cl 116.9 9.0 128.5 91 5 N 09/29/23 CF BUILDING PAD FG Cl 115.3 9.5 128.5 90 6 N 09/29/231 CF BUILDING PAD FG Cl 116.4 8.2 128.5 91 N-Nuclear Test Method CI'Compacted Fill FG-Finish Grade