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Home My WebLink AboutX2017-3130 - SoilsCOLEMAN GEOTECHNICAL 470 WALD IRVINE, CA 92618 PHONE (949) 872-2582 GEOTECHNICAL ENGINEERING SERVICES Email; Lashoemaker@cs.com June 24, 2018 Mark Haupert 2911 E La Palma Ave. Anaheim, CA 92806 Attention: Mr. Mark Haupert Subject: Geotechnical Report of Precise Grading Proposed New Residence 1556 E. Ocean Boulevard Balboa Island, Newport Beach, CA V01-7- 3130 1556Ocean blvd Job No. 3204 Reference: Geotechnical Investigation Report, New Residence,1556 E. Ocean Boule- vard, Balboa Island, Newport Beach, CA, by this firm, dated September 15, 2017, by this firm Dear Mr. Haupert: This letter presents the results of our observations and testing performed during the grading for the new building pad at the subject address. Footing observations, pave- ment subgrade, utility trench backfill, moisture conditioning, etc. should be tested and approved when completed. Shoring and Grading Observations The following geotechnical observations were made during the course of grading: 1. Prior to overexcavation and recompaction of soils, temporary shoring was installed along portions of the site to protect offsite properties. The limits of the shoring are approximately shown on the attached Geotechnical Plan. The shoring consisted of a system of steel pipes and wood lagging installed approximately as shown on the plans prepared by the project structural engineer. 3204grad.doc 2. The existing soils within the upper 36 inches of the site was overexcavated, blended with cement, moisture conditioned, and compacted in 6 inch lifts. The ce- ment/soil ratio was approximately 4-5% by weight based on the number of Portland Cement bags used per 6 inch layer of soil. 3. The materials exposed at the bottom of the overexcavation consisted of moist fine sand. The exposed bottom soils were scarified, blended with cement and recom- pacted to a depth of approximately 12 inches. 4. All fill was placed, compacted and tested in 4" to 6" lifts with 2 bags of Portland Ce- ment per 1 cubic yard of onsite soils (approximately 4% by weight). The limits of removals and recompaction extended to a distance of approximately 2 feet outside the building lines. 5. The upper 12 inches of the building pad required imported soils to balance the pad which consisted of crush gravelly sand imported to the site. 6. The building pad and garage pad are at near finished grade and were suitably com- pacted per our recommendations. The building pad were left slightly low to accom- modate future footing excavation cuttings. Footing excavation soils will be com- pacted in the lower areas of the building pad and garage pad at a future date. The finished pad grade shall be observed prior to placement of the slab underlayment. Fill Placement and Compaction In general, processing, moisture conditioning, and recompaction of the soil materials were performed using a Rubber Track Loader compacter and a 1-1/2" inch water hose. Fill was placed in approximately 4 to 6 inch horizontal lifts, with each lift compacted with the grading equipment. Fill Materials The materials used for fill consisted of native fine sand which was test previously and is non -expansive. The pad was capped with crushed coarse sand which was imported to the site and is also considered non -expansive. Any soils used to make finished pad grade (i.e. footing cuttings) shall be compacted prior to placement of the slab under- layment materials. Based on our observations, our recommendations for foundation, floor slab, and concrete type are still considered suitable and applicable. Testing Procedures In Place Density Tests Maximum Density/Optimum Moisture Expansion Index Soluble Sulfates ASTM D-2937 ASTM D-1557 UBC Test Method 18-2 ASTM D-516 The results of tests are presented on the attached "Table of Tests Results". The loca- tion of tests are shown on the attached "Geotechnical Plan." 3204grad.doc Closure The results of our observations and density testing indicate that new cement -treated fill used to construct the building pad was compacted to at least 90 percent relative com- paction in accordance with our recommendations and the City of Newport Beach Grad- ing Code. The new building pad is now considered suitable for the support of the proposed struc- ture. Other earthwork on this project remains to be tested and approved. Respectfully submitted, COLEMAN GEOTECHNICAL No, GE 229 Exp:6-30=1s James R. Coleman, G.E.229 Exp. 6/30/2019 Attachments: 1. Table of Test Results 2. Geotechnical Plan Cc; (1) Michael Terry, Graystone Builders, E -Copy 3204grad.doc Lee Shoemaker, CEG 1961 Exp. 11/30/2018 §) {41& Ed \9% m00) )/\ ,��,��,� §] }( ` 2\ 23 23 §} ( \ \ \ (\ \ ) d j ( k �\/ \ m /f{ ® a$) § >\+ ƒ % G ¥ \ _ , ¥� 2 . \ ¥( zFn _ to MW \ �\ ; § ; 0\ c �� , , , - ); m,{ . aJ !e @ 77 ; ; 7c kf )c 5 ( )§ » � (J k k > "6t'.t'Z.00=C1 IWIAI ng � rz 07 10 Co (0 Illy U Lo L J m L �— 10K CN0(1) Yj w I I Haw Z X I I x �NJ ,13AO' 41 X Pig LEGEND A&- Thin Manmade Fill over Beach Deposits COLEMAN GEOTECHNICAL GEOTECHNICAL PLAN Oda AMP AZ 0 e e I'Vef e- 7- / ovV JOB NO. I DATE I DR, BY q. *,0yVf1ry 7ery- A A Im � to — — �-4 TEM 1VYZ.M Z 14 CA" ri 45 COLEMAN GEOTECHNICAL 470 WALD IRVINE, CA 92618 PHONE (949) 872-2582 GEOTECHNICAL ENGINEERING SERVICES Email; Lashoemaker@cs.com July 31, 2019 Mark Haupert 2911 E La Palma Ave. Anaheim, CA 92806 Attention: Mr. Mark Haupert Subject: Final Geotechnical Report New Residence 1556 E. Ocean Boulevard Balboa Island, Newport Beach, CA Job No. 3204 Reference: Geotechnical Investigation Report, New Residence, 1556 E. Ocean Boulevard, Balboa Island, Newport Beach, CA, by this firm, dated June 24, 2018 by this firm Dear Mr. Haupert: This letter presents the results of our final observations and testing performed since the completion of precise grading for the new home at the subject address. Foundation Excavations Prior to the placement of the new concrete floor, the foundation excavations were ob- served by this firm. The excavations were found to probe firm and unyielding and suit- able for support of the assumed designed bearing pressure. Slab Underlayment System Prior to placement of the concrete slab, underlayment materials were placed as speci- fied in our Geotechnical Investigation Report and in accordance to the project plans. 3204Final.doc These items include at 4 inch layer of open -graded gravel topped by filter fabric overlain by a 15 MIL vapor barrier. Approximately two inches of sand was placed over the vapor barrier and tamped prior to the placement of the concrete slab. Front Entry Backfill and Subgrade The front entry deck and patio required the placement of 1-2 feet of fill to achieve the desired finished grade. The soils placed in this area after the house was completed and consisted of Sand and Silty sand. These soils were tested and probed and found to be compacted to a minimum of 90 percent relative compaction. Fill Materials The materials used for fill consisted of native fine sand and silty sands which are non - expansive. Testing Procedures In Place Density Tests Maximum Density/Optimum Moisture Expansion Index Soluble Sulfates ASTM D-2937 ASTM D-1557 UBC Test Method 18-2 ASTM D-516 The results of tests are presented on the attached "Table of Tests Results". The loca- tion of tests are shown on the attached "Geotechnical Plan." Closure The results of our observations and density indicate that the earthwork described in the proceeding paragraphs was performed accordance to our recommendations and is suitable from a geotechnical standpoint... All backfill specifically observed and tested by this firm was compacted to at least 90 percent relative compaction in accordance with our recommendations and the City of Newport Beach Grading Code. 3204Final.doc The building site is now considered suitable for support of the new improvements. Respectfully submitted, COLEMAN GEOTECHNICAL %rJ dONryS'� ok 078823 CIVIL Jehu Johnson, P.E. Exp. 9/30/2019 Attachments: 1. Table of Test Results 2. Geotechnical Plan Cc; (1) Michael Terry, Graystone Builders, E -Copy 3204Final.doc Lee Shoemaker, CEG 1961 Exp. 11/30/2020 [ 2 § \ A LEGEND AFThin Manmade Fill over Beach Deposits C*Ar M %AO COLEMAN GEOTECHNICAL GEOTECHNICAL PLAN JOB NO. I DATE I DR. BY .00'98L'17=8 F Nf S-7-71. ... 7.7 Jh1C C14 to Z Ii 1 0 LO z CN 0 to LO ZNO LEGEND AFThin Manmade Fill over Beach Deposits C*Ar M %AO COLEMAN GEOTECHNICAL GEOTECHNICAL PLAN JOB NO. I DATE I DR. BY