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Home My WebLink About; 2380 Jefferson Street; Final Compaction Report of Grading; 2001-09-10FINAL COMPACTION REPORT OF GRADING 2380 JEFFERSON STREET CARLSBAD, SAN DIEGO COUNTY, CALIFORNIA FOR MULLEN CONSTRUCTION 2890 PIO PICO DRIVE CARLSBAD, CALIFORNIA 92008 W.O. 2864-B-SC SEPTEMBER 10, 2001 Alpha & Omega 2382 Camino Vida Roble, Suite F, Carlsbad, CA 92009 760-931-1792, 760-931-1892 FAX, Email: nservin(a)earthlink.net September 7, 2001 City ofCarlsbad Building Department Carlsbad, CA 92008 Subject: Pad Certification of Jefferson Street Building for Walley Mullins We have performed a site survey setting building and wall locations for the contractor on said residential construction site previously. Today I made the last visit for pad certification. The pad location and elevation are within acceptable limits pursuant to the approved grading plans, therefore, accept this letter as certification for said pad. Call me ifyou have any questions on this matter. Sincerely, NICK SERVIN, PE,Trincipai Engineer #33538 h^S^7 C :\My Documents\WP\STRUCT\Mullins_Pad_Cert.wpd Geotechnical • Geologic • Environmental 5741 PalmerWay • Carlsbad, California 92008 • (760)438-3155 • FAX (760) 931-0915 September 10, 2001 W.O. 2864-B-SC Mullen Construction 2890 Pio Pico Drive Carlsbad, California 92008 Attention: Mr. Edgar H. IVIullen Subject: Final Compaction Report of Grading, 2380 Jefferson Street, Carlsbad, San Diego County, California References: 1. "Preliminary Geotechnical Evaluation. Parcel 20, East Side of Jefferson Street Carlsbad California," W.O. 2864-A-SC, dated April 26, 2000, by GeoSoils, Inc. 2. "Uniform Building Code," Whittier. California. Vol. 1. 2. and 3. dated 1997 by international Conference of Building Officials. INTRODUCTION This report presents/ summary of the geotechnical testing a^hd observation services provided by GeoSojIfe, Inc. (GSI) during the rough earthworkSfase of development ofthe subject site. E^thwork commenced August 20, 2Cf^and was completed on August 22, 20^ Survey of line and grade and locating of the building footprint was performed by others and not performed by GSI. Based on the observations and testing performed by GSI, it is our opinion that the building pad area appears suitable for its intended use. PURPOSE OF EARTHWORK The purpose of grading was to prepare a relatively level pad for the construction of a single family residence. ENGINEERING GEOLOGY The geologic conditions exposed during the process of grading were regularly observed by a representative from our firm. The geologic conditions encountered generally were as anticipated and presented in our referenced report (GSI, 2000). GEOTECHNICAL ENGINEERING Preparation of Existing Ground 1. Prior to grading, the major surficial vegetation was stripped and hauled offsite. 2. Removals consisted of existing fill and colluvium within the building area to at least five feet outside the building footprint. Removals in this area varied up to approximately 3 feet below pre-construction grades. Once removals were completed, the exposed was reprocessed prior to fill placement. Overexcavation Where removals were less than a recommended fill blanket thickness of 3 feet, overexcavation to a depth of 3 feet below pad grade was performed within the building footprint, Overexcavation was completed to at least five feet beyond the building footprint in accordance with the recommendations presented in our referenced report (GSI, 2000), The actual location of the proposed footprint of the building was provided by others. Fill Placement 1. Fill consisting of native soils were placed in 6- to 8-inch lifts, watered, and mixed to achieve at least optimum moisture conditions, and compacted using earth moving equipment to a minimum relative compaction of 90 percent of the laboratory standard. 2. Fills were not placed on surfaces steeper than 2:1 (horizontal to vertical). 3. Oversize materials (12 inches and greater) were placed outside of the limits of the building in landscape areas or a pre-designated disposal area. Mullen Construction W.O. 2864-B-SC 2380 Jefferson Street, Carlsbad September 10, 2001 File:e:\wp7\2800\2864b.fcr Page 2 GeoSoils, Inc. FIELD TESTING 1. Field density tests were performed using nuclear densometer ASTM test methods D-2922 and D-3017 and sand-cone ASTM test method ASTM D-1556. The test results taken during grading are presented in the attached Table 1, and the locations of the tests taken during grading are presented on Plate 1. 2. Field density tests were taken at periodic intervals and random locations to check the compactive effort provided by the contractor. Based upon the grading operations observed, the test results presented herein are considered representative ofthe compacted fill. 3. Visual classification of the soils in the field was the basis for determining which maximum density value to use for a given density test. LABORATORY TESTING Maximum Densitv Testing The laboratory maximum dry density and optimum moisture content for the major soil type within this construction phase were determined according to test method ASTM D-1557. The following table presents the results: SOIL TYPE MAXIMUM DENSITY (pcn MOISTURE CONTENT (PERCENT) A - Orange Brown Silty Sand 127.5 10.5 Expansion Index Expansive soil conditions have been evaluated for the site. A representative sample of the soils near pad grade was recovered for expansion index testing. Expansion index testing was performed in general accordance with Standard 18-2 ofthe Uniform Building Code (International Conference of Building Officials, 1997). The test results indicate an expansion index of <5, and the corresponding expansion classification of very low. Mullen Construction W.O. 2864-B-SC 2380 Jefferson Street, Carlsbad September 10,2001 Flle:e:\wp7\2800\2864b.fcr Page 3 GeoSoils, Inc. Corrosivity Typical samples ofthe site materials were analyzed for corrosion/soluble sulfate potential. The testing included determination of pH, soluble sulfates, and saturated resistivity. At the time of this report the results were not available. An addendum to this report will be issued when the testing is complete. CONCLUSIONS AND RECOMMENDATIONS Unless superseded by recommendations presented herein, the conclusions and recommendations contained in the referenced report (GSI, 2000) remain pertinent and applicable. REGULATORY COMPLIANCE Processing of original/existing ground and placement of compacted fills under the purview of this report have been completed under the observation of and with selective testing provided by representatives of GSI and are found to be in general compliance with the requirements of the City of Encinitas, California. Our findings were made in conformance with generally accepted professional engineering practices, and no further warranty is implied or made, GSI assumes no responsibility or liability for work, testing, or recommendations performed or provided by others. This report is subject to review by the controlling authorities for this project. Mullen Construction W.O. 2864-B-SC 2380 Jefferson Street, Carlsbad September 10.2001 File:e:\wp7\2800\2864b.fcr Page 4 GeoSoils, Inc. We appreciate this opportunity to be of service. If you have any questions, please call us at (760)438-3155. Respectfully submitted, GeoSoils, Inc. ^^TTVOSS*^ Staff Geologist Reviewed by: n f>. Ran ngineering Geologist BV/JPF/DWS/jh Reviewed by: Civil Engineer, Attachments: Table 1 - Field Density Test Results Plate 1 - Field Density Test Location Map Distribution: (4) Addressee Mullen Construction 2380 Jefferson Street, Carlsbad Flle:e:\wp7\2800\2864b.fcr W.O. 2864-B-SC September 10, 2001 Pages GeoSoils, Ine. Table 1 FIELD DENSITY TEST RESULTS TEST S:::P*T£::::: TEST LOCATION ELEVATION MOISTURE DRY RELATIVE TEST SOIL NO. OR CONTENT:: ::DENSITY: COMPACTtON: ::METH0D: TYPE: DEPTH (ft) t%) (pcQ CM 1 8/20/01 SOUTH END PAD AREA 74.0 10.8 114.8 90.3 ND A 2 8/20/01 NORTH END PAD AREA 75.0 10.2 115.6 91.0 ND A 3 8/22/01 SOUTH PAD AREA FG 12.3 118.2 93.0 SC A 4 8/22/01 NORTH PAD AREA FG 10.6 114.8 90.3 ND A Legend: ND - Nuclear Densometer SC - Sand Cone Mullen Construction File:e:Vexcel\tables\2800\2864b W.O. 2864-B-SC Pagel GeoSoils, Ine.