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Home My WebLink AboutCDP 13-25; GAITAUD RESIDENCE; PAD CERTIFICATION; 2014-02-02cvr i ~p -;,5 San Diego 6280 Riverdale Street SOUTHERN CALIFORNIA 6192804321 San Diego, CA92120 (S( SOIL &TESTIN•G, INC. Indio 83-740 Citrus Avenue. Acalifornia Certified SmallBusiness Enterprise (SBE) 760 775 5983 Suite G Indio, CA 92201-3438 Riverside 1130 Palmyrita Avenue 951.965.8711 Suite 330-A Riverside, CA 92507 Toll Free 877.2154321 www.scst.com February 7, 2014 Phil Gaitaud Gaitaud Construction Post Office Box 28696 San Diego, Carlsbad 92198 Subject: AS-GRADED GEOTECHN ICAL REPORT GAITAUD RESIDENCE 4419 PARK DRIVE CARLSBAD, CALIFORNIA PERMIT NO. 13-31 SCS&T No. 1311056 Report No. 4 Reference: "Gootechnical Investigation, Single-Family Residence, 4419 Park Drive, Carlsbad, California"; prepared by Southern California Soil and Testing, Inc.; dated May 9, 2013 (SCS&T 1311056-2). Dear Mr. Gaitaud: In accordance with your request, this report has been prepared by Southern California Soil and Testing, Inc. (SCS&T) to present the results of field observations and tests performed during the grading for the proposed single-family residence. 1. PROJECT DESCRIPTION AND SUMMARY The proposed project is located at 4419 Park Drive in the City of Carlsbad, California. In general, the grading operations consisted of the excavation and the replacement of the soils beneath settlement sensitive structure. Our services were performed between January10 and January 30, 2014. The grading was performed by Accurate Underground and Grading of Ramona, California. To assist in determining the locations and elevations of our field density tests, we were provided with a grading plan prepared by Landmark Consulting dated December 18, 2013, which defines the general extent of site grading. 1.1. SITE PREPARATION 1.1.1. Primary Equipment The primary equipment employed for the site mass grading operations included: 1 - Caterpillar D6 Dozer 1 - Fire Hose Gaitaud Construction February 7, 2014 Gaitaud Residence - 4419 Park Drive SCS&T No. 1311056-4 Carlsbad, California Page 2 1.1.2. Clearing and Grubbing Site preparation began with the demolition of the existing improvements and the clearing and grubbing of the existing vegetation and debris at the proposed development area. The material generated from these operations was exported from the site. 1.2. SITE GRADING The existing fill and alluvial deposits were excavated to a depth of 5 feet below the planned footing bottoms. The bottoms of the excavated areas exposed alluvial deposits. The excavation extended laterally 5 feet beyond the perimeter of the planned structure. The surface exposed at the bottom of the excavation was scarified to a depth of 12 inches, moisture conditioned, and compacted until field density tests indicated a minimum of 95% relative compaction. Mirafi HP 570 stabilization fabric was placed on the surface of the compacted excavation bottom. All references to optimum moisture and relative compaction in this report are based on the ASTM D 1557 laboratory test method. The excavated soils were placed as compacted fill. Fill was placed in 6 to 8-inch lifts, moisture conditioned to near optimum moisture content and compacted until field density tests indicated a minimum of 90% relative compaction. All references to optimum moisture and relative compaction in this report are based on the ASTM D 1557 laboratory test method. Compaction was achieved by mean s of a Caterpillar D6 track dozer. This process continued until planned elevations were reached. Figure 1 presents the approximate locations of these tests. 2. FIELD OBSERVATIONS AND LABORATORY TESTS Field observations and density tests were performed by a representative of SCS&T during the grading operations at the locations shown on Figure 1. The density tests were performed according to ASTM D 6938 (nuclear gauge) procedures. The results of these tests are shown on Figure 2. The accuracy of the in-situ density test locations and elevations is a function of the accuracy of the survey control provided by others than SCS&T representatives. Unless otherwise noted, their locations and elevations were determined by pacing and hand level methods and should be considered accurate only to the degree implied by the method used. As used herein, the term "observation" implies only that we observed the progress of work we were involved with, and performed field density tests which, in conjunction with our observations, were the base for our opinion as to whether the work was performed in substantial conformance with the geotechnical recommendations and the requirements of the applicable agencies. Maximum dry density determinations were performed on representative samples of the soils used in the compacted fills according to ASTM D 1557. The results of these tests, presented on Figure 2, were used in conjunction with the field density tests to determine the degree of relative compaction of the compacted fill. Stephen T. Ward Field Supervisor Geotechnical Engineer Should you have any questions regarding this document or if we may be of further service, please contact our office at your convenience. Respectfully Submitted, SOUTHERN cALtFORI SOIL AND TESTING, INC. GBF:STW :sW:aw (4) Addressee Gaitaud Construction February 7, 2014 Gaitaud Residence - 4419 Park Drive SCS&TNo 1311056-4 Carlsbad, California Page 3 3. REMAINING WORK The following operations remain to be completed. It is recommended that field observations and relative compaction tests be performed during these operations to verify that these operations are being performed in accordance with lob requirements and local grading ordinances Grading of the driveway and other hardscape areas Subgrade preparation for hardscape areas Backfilling of retaining walls, if any were built Backfilling the underground utility trenches CONCLUSIONS Based on our field observations and the in-place density test results, it is our opinion that the building pad preparation and compaction were performed substantially in accordance with the recommendations contained in the referenced geotechnical report, the City of Carlsbad Grading Ordinance, and the California Building Code. LIMITATIONS This report covers only the services performed between January 10 and January 30, 2014. Our opinions are based on our observations and the relative compaction test results and are limited by the scope of the work that we agreed to perform Our work was performed in accordance with the currently accepted standard of practice and in such a manner as to provide a reasonable measure of the compliance of the grading and backfill operations With the project requirements. No warranty, express or implied, is made or intended with respect to the work that we have performed, and neither the performance of this work nor the submittal of this report should be construed as relieving the contractor of its responsibility to conform with the project requirements Our work was generally performed on an "on-call" basis. Therefore, the in-place density tests performed by our field representative can only be construed as representative of the areas tested as shown on the attached figures. SCS&T LEGEND .23 Approximate Location of In-Place Density Test F3 37o Approximate Bottom Excavation Elevation, in Feet E:J Approximate Limits of Excavation A EXIST.36 i _I WAa i ji - - - - - - - - -- - - M - GS. 36' 4LL PROP-PROP; 6' CONC. DOORSTEP PROPOSED TM ,$TORY HOUSE DRAIN DRIVEWAY ::1 4 Pop. PAD moo - TO PERWOUS GF DISCHARCE FROM DOMTEP - S ._— m — — — — — — — a _1.ai. _CONC. DOORSTEP — — — — -- a; I J• Maa UL1 . a___. a•- _i.__i. jmiaa -I! COURTYARD - IE 41.25 OPEN W1 PERVIOUS PAVERS 2 e13 34.5 9 o 18--.J j: L IIV -LEJT ' l . \•5 rx,r IN-PLACE DENSITY TEST Date: February, 2014 Figure: SOUTHERN CALIFORNIA LOCATION MAP By: EAK S OIL &TESTING, INC. 4419 PARK DRIVE Job No.: 1311056-4 1 Carlsbad,California Scale: Not To Scale JOB NAME: Gaitaud Residence JOB NUMBER: 1311056-4 IN-PLACE DENSITY TESTS TEST ELEVATION MOISTURE DRY DENSITY SOIL REL.COMP. NO. DATE LOCATION (feet,MSL) (percent) (p.c.f.) TYPE (percent) 1 1/10/14 Proposed Residential Pad 35.0 PNG 11.0 124.6 1 95.3 2 1/10/14 Proposed Residential Pad 35.0 PNG 10.3 125.5 1 95.9 3 1/13/14 Proposed Residential Pad 37.0 8.9 119.1 1 91.1 4 1/13/14 Proposed Residential Pad 39.0 8.5 118.9 1 90.9 5 1/13/14 Proposed Residential Pad 41.0 7.9 118.1 1 90.3 6 1/14/14 Proposed Residential Pad 33.0 PNG 7.3 126.2 1 96.5 7 1/14/14 Proposed Residential Pad 33.5 PNG 8.5 125.8 1 96.2 8 1/15/14 Proposed Residential Pad 35.0 5.9 119.7 1 91.5 9 1/15/14 Proposed Residential Pad 35.0 5.4 121.3 1 92.7 10 1/15/14 Proposed Residential Pad 37.0 9.8 118.8 1 90.8 11 1/15/14 Proposed Residential Pad 39.0 8.5 118.6 1 90.7 12 1/15/14 Proposed Residential Pad 41.0 10.4 119.9 1 91.7 13 1/17/14 Proposed Residential Pad 34.0 PNG 8.1 124.8 1 95.4 14 1/17/14 Proposed Residential Pad 34.0 PNG 7.4 126.3 1 96.6 15 1/22/14 Proposed Residential Pad 36.5 7.4 121.6 1 93.0 16 1/22/14 Proposed Residential Pad 34.5 PNG 9.6 124.5 1 95.2 17 1/22/14 Proposed Residential Pad 34.5 PNG 8.4 125.4 1 95.9 18 1/23/14 Proposed Residential Pad 36.5 8.1 120.4 1 92.0 19 1/23/14 Proposed Residential Pad 38.5 9.7 124.1 1 94.9 20 1/23/14 Proposed Residential Pad 40.0 9.1 122.0 1 93.3 21 1/30/14 Proposed Residential Pad 42.25 FG 8.4 125.0 1 95.6 22 1/30/14 Proposed Residential Pad 42.25 FG 9.2 126.1 1 96.4 23 1/30/14 Proposed Residential Pad 42.25 FG 9.9 124.5 1 95.2 PNG = Prepared Natural Ground FG = Finish Grade MAXIMUM DENSITY AND OPTIMUM MOISTURE SUMMARY (ASTM D1557) I Soil Maximum Optimum Type Soil Description Density, pcf Moisture, % 1 Brown Silty Sand 130.8 9.1 FIGURE 2