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Home My WebLink AboutB2005-1425 - SoilsMr. James C. Julian' TRC SOLUTIONS 21 Technology Drive Irvine, CA 92618 Dear Mr. Juliani: TRC Lowrey October 6, 2006 1651-26B ?' ' i 'O?- z o f 1 1--?-uo3 J>' RE: GEOTECHNICAL OBSERVATION AND TESTING BUILDING PAD CHILD CARE CENTER HOAG LOWER CAMPUS, PACIFIC COAST HIGHWAY NEWPORT BEACH, CALIFORNIA In this letter we summarize the results of our geotechnical observation and testing services for the Child Care Center Building Pad of the above referenced project. As you know, we performed a geotechnical investigation for the project and presented the results in our February 25, 2005 report titled "Retaining Wall, Parking Lot, and Child Care Center, Hoag Hospital Lower Campus, Califomia." EARTHWORK REQUIREMENTS A general summary of the earthwork requirements related to construction of the building pads as set forth in the project plans and specifications is as follows: 1. Clearing of surface and subsurface deleterious materials, including buried utility lines, pavements, debris, shrubs and associated roots. 2. Over -excavation of undocumented fill in old landscape south side of building pads. 3. Compacting fill as well as scarified surface soils in those areas to receive fill to at least 90 percent relative compaction as determined by ASTM Test Designation D1557, latest edition. The Child Care Center will be supported by conventional spread footings bearing on undisturbed bedrock. It is our understanding that the building floors will be elevated from the pad grade. Since the proposed development is expected to bear on competent native 251 E. Imperial Hwy, #470 Fullerton, CA 92835 Main: 714.441.3090 Fax: 714.441.3091 E-mail: mail@lowney.com htto://www.lownev.com TRC Solutions Child Care Center bedrock formation and no surficial fill are expected in the area except at the above mentioned undocumented fill area, compaction of the native bedrock in the cut areas is not required within the building footprints. All fills, disturbed bedrock and surface soils that will bear exterior flatwork will still need to be compacted according to the requirements set forth in "Section 7.4 Compaction" of our report. We refer you to the project plans and specifications and our report for a more detailed description of the earthwork requirements. SERVICES PERFORMED The scope of our services was primarily directed toward part-time observation and testing during the earthwork operations as set forth In our agreement with you dated August 9, 2005. Construction work involving our geotechnical engineering services to date has included: 1) site stripping, 2) suitability of fill material, and 3) building pad fill compaction. During grading operations for Child Care Center Building Pad, we observed the geotechnical aspects of the work and performed field density tests to check conformance of the fill with our recommendations and the project plans and specifications. A total of 10 field density tests were performed at various locations and elevations across the building pads in the fill area. The locations and results of these field density tests were described in our Daily Field Reports Nos. 90 through 94, for the period from September 26, 2006 through October 2, 2006. These tests were performed to check conformance with the project plans and specifications. Laboratory testing consisted of 1 compaction curve on the soil used as fill for the over - excavated area. Records of the field density tests and laboratory testing are kept in our files for a period of three years after completion of the project and are available for your review, if desired. MEANING OF "OBSERVATION" "Observation", as used in this document, means that we observed the progress of the work on an intermittent basis, and performed tests on selected soil and rock materials. Our TRC Lowney Page 2 1651-26B TRC Solutions Child Care Center opinion about the general conformance of geotechnical aspects of construction to our recommendations and project specifications is based on these observations and test results. CONCLUSIONS Based on our field observation and compaction test results, it is our opinion that the geolechnical aspects of the construction of Child Care Center Building Pad, including subgrade preparation, fill material and building pad compaction have been performed in general conformance with the project plans and specifications and the recommendations presented in our geotechnical report. Our services were performed in accordance with geotechnical engineering principles generally accepted at this time and location; we make no other warranty, expressed or implied. If you have any questions concerning our observations, test results, or opinions, please call and we will be glad to discuss them with you. Very truly yours, TRC LOWNEY Adolfo Camacho Staff Engineer ADC:AB:Ig Copies: Addressee (2) Torn Dean (4) Wet Stamped Ali Easton', PhD, PE, GE.2. Associate, Area Manager' FN, P:\Project\1651-266 (TRC-Hoag Wall Construction)\Report11551-266 Child Care Center Pad Letter.doc TRC Loviney :\ Page 3 1651-268 TABLE 1. COMPACTED FILL IN -PLACE DENSITY TEST RESULTS Test 1/ 1* 2 3 4 6 6 7 8 9 10 DATE 7/12/06 7/12/08 7/12/06 7112/05 7/12/06 7/12/06 7/12/08 7/12/06 7112108 7/12/06 TEST LOCATION Over -End Area Over-Etad Me Over-Exed Area Over-Exed Aron Over -End Area Over-Exed Area Over -Enid Area Over-Exed Area Over -Faced Area Over•Exed Area Trrr Cl I VATION p,..tl 1611 tea 18.6 18.5 16.5 18.5 20.0 20.0 20.0 Curve Number 2 2 2 2 2 2 2 2 P[NSITY (PJ� 90 122 SEMI 122 122 122 122 122 122 122 L:'PLACC :70ISA1Rt x NSIT'/IP'0 CONTr NT prra nt 74.0 109.8 110.5 109.9 110.1 111.8 110.9 111.3 112.0 112.4 41.3 14.5 152 14.7 12.9 16.9 13.8 14.6 14.6 14.9 �LLATIVL rnss na cnmrACT. Ir^rcenn FnIL 90% 91% 90% 90% 92% 91% 91% 92% 92% FAIL PASS PASS PASS PASS PASS PASS n PASS PASS Comment 90% Percent Required *Test81 soli removed & replaced with new 65 material. 1651-26B Compaction Test Results, 10/6/2006 Page 1 of 1 LEGEND — Approximate location of field density tests Bap by 11E Bdullons N 1 TEST LOCATION MAP CHILD CARE CENTER Newport Beach, California inec Lowey FIGURE 1 1651-268 e 135 130 125 120 115 110 105 0 100 95 90 85 80 75 0 5 10 Job No. Project 1651-26B HOAG CHILD CARE CENTER NEWPORT BEACH. CA Source of Material Description of Material Depth Test Method CURVE SILTSTONE (MH) ASTM D1557 Method B TEST RESULTS Maximum Dry Density Optimum Water Content r 90.0 PCF 25.0 % ATTERBERG LIMITS LL PL PI X X 9i CURVES OF 100% SATURATION FOR SPECIFIC GRAVITY EQUAL TO: 2.80 2.70 2.60 15 20 25 30 35 40 Tic Laney WATFRS'.mNTF 45 MOISTURE -DENSITY RELATIONSHIP Project: HOAG CHILD CARE CENTER Location: NEWPORT BEACH, CA Project No.: 1651-268 8 a ce 0 5 a 0 135 130 125 120 115 110 105 100 95 90 85 80 Job No. 1651-268 project HOAG CHILD CARE CENTER NEWPORT BEACH, CALIFORNIA Source of Material Description of Material Depth Test Method Al 75 0 Curve 2 0.0 SILTY SAND (SM), brown, some gravel ASTM D1557 Method 8 TEST RESULTS Maximum Dry Density 122.0 PCF Optimum Water Content 12.0 % 5 10 15 20 25 WAIF RZONMIC0 TRC Lowney ATTERBERG LIMITS LL PL PI % CURVES OF 100% SATURATION FOR SPECIFIC GRAVITY EQUAL TO: 2.80 2.70 2.60 30 35 40 45 MOISTURE -DENSITY RELATIONSHIP Project: HOAG CHILD CARE CENTER Location; NEWPORT BEACH, CALIFORNIA Project No.: 1651-26B 1 NOV-5-2007 07:40A FROM:GEO5CIENCE ANALYTICA C205)526-3570 TO:19497644466 P.1 GeoScience Analytical, Inc. "established March 1981" 608I IAILEY COURT SIMI VALLEY, CA 93065 (805) 526-6532 I'AX 526-3570 L'MAIL CEOSCIIo r@AOL.COM 5 November 2007 TO: Hoag Memorial Hospital Presbyterian — Child Care Center ATTN.: Ted Liu, Project Engineer, FD&C FROM: Louis J. Pandolfi RE: Combustible Gas Concentrations (Interior Space): Child Care Center, Hoag Memorial Hospital Presbyterian, Newport Beach, CA This memorandum shall serve as your notification that GSA has completed its inspections, in its capacity as design Engineer, of the subslab soil gas mitigation systems, including vent risers and roof terminations, per plans, for the above referenced Child Care Center. Installations have been performed according to plans. Furthermore, I am a Registered Professional Engineer in the State of California and I am knowledgeable in the field of combustible soil gas control and mitigation systems. The soil gas control and mitigation systems installed within this project have been constructed under my supervision and in accordance with the plans reviewed by the City of Newport Beach. The buildings have been tested and determined to be free of any concentration of gases that the control system was designed to mitigate. All structures were tested on or before November 2, 2007. A copy of the test results is included with this statement. Hoag Memorial Hospital Presbyterian is assuming final responsibility for connection of gas detection system to central alarm station and PBX. Child Care Center Combustible Gas Concentration In Structure <] .0% LEL Jim L. Chattcrley ouis . Pandolfi RCE No. 229] 7 President Civil Environmental Audits Hazardous Gas Engineering Litigation Consulting Petroleum Geochemistry ■ • ■ GUIDA SURVEYINGINC. October 6, 2006 Tom Deen TRC Customer -Focused Solutions 21 Technology Drive Irvine, CA 92618 Phone: (949) 727-7362 Fax: (949) 727-7399 Subject: Hoag Memorial hospital Presbyterian Lower Campus "Certification for the Child Care Building Pad" Dear Tom, On October 5, 2004, Guida Surveying. Inc. performed an asbuilt topographic survey of the Child Care Building Pad. We found the pad to be graded with in substantial. conformance of the plan grade of 20.0. Please sec attached a plot of shots taken for the existing pad limits. If you have any questions please call me at (949) 777-2000. Sincerely, Tim Fettig, P.L.S.