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HomeMy WebLinkAboutPD 2020-0008; CHURCH RESIDENCE; FINAL SOILS REPORT; 2025-09-16REPORT OF CONSTRUCTION OBSERVATIONS AND FIELD DENSITY TESTING Residence Area Retaining Wall 4475 Adams Street Carlsbad, Ca. 92009 JOB NO. 18-7072-FC May 21, 2024 Prepared For: Mr. Barry Church Clo Mc Cullougb Design and Development, Inc. 10531 4S Commons Drive, Suite #700 Sau Diego, CA. 92127 Prepared by: C.W. LA MONTE CO. INC7840 El Cajon, Suite "200" La Mesa, CA. 91942 (619)462-9861, Fax (619) 462-9859 C.W. LA MONTE CO. INC Soil and Foundation Engineering ServicesMay 21, 2024 CITY OF CARLSBAD Engineering and Development Department Building Inspection Section 1200 Carlsbad Village Drive Carlsbad, Ca. 92008 JOB NO. 18-7072-FC SUBJECT: REPORT OF CONSTRUCTION OBSERVATIONS AND RELATIVE FIELD DENSITY TESTING Dear Sirs: SFR Retaining Wall Density Testing 4475 Adams Street Carlsbad, Ca. 92008 In accordance with the contractors' request C. W. La Monte Company, Inc. has prepared this report to summarize our observations of the retaining wall backfill at the above subject site. We hereby present the results of density tests perfonned in the fill that was placed during the wall backfill operations. The observation and testing services addressed by this report were provided during the period of May 7, 2024 thru May 10, 2024 for the residence retaining wall area. Scope of Work Services provided by C.W. La Monte Company, Inc. during the course of the earthwork consisted of the following: 1.Inspection of the retaining wall base area excavations for conformance to Soils Report. 2.Performance of laboratory Maximum Dry Density and optimum moisture determinationson the soils placed and compacted for the residential area retaining wall to verify propercompaction. 3 Performing field density testing of the placed and compacted base fill. 4 Preparation of this report. Job No. 18-70 72-FC May 21, 2024 Page2 General Site Information The property is accessed from the south side of Adams Street in the southeast area of the city of Carlsbad. The retaining wall was constructed beyond the north side of the residence vault as shown on the plans provided. Plan Reference In order to augment our understanding of the designed configuration of the residence retaining wall area, a site plan for the residence was obtained from the Contractor for our use. Figure No. 1 of this report is a modification of the plan provided to us to record the approximate location of our field density tests from field measurements. Field Observations Tests and observations were provided by a representative of C.W. LA MONTE COMPANY INCORPORATED. The presence of our field representative at the site was to provide to the client a source of professional advice, opinions, and recommendations based upon the field representative's observations of the contractors work and did not include any superintending, supervision, or direction of the actual work of the contractor's workers. Materials used to backfill the retaining wall consist primarily of tan to brown silty fine to medium sand backfill. These materials meet or exceed the design specifications referred to in the approved plans. The site is underlain at depth with competent forrnational material. The soil conditions were as anticipated. Field Tests Field density tests were performed in accordance with A.S.T.M. D-1556 guidelines. Maximum density determinations were performed in accordance with A.S.T.M. D-1557 , Method A guidelines. The relative compaction results, as summarized on Figure No. II, are the ratios of the field densities to the laboratory Maximum Dry Densities, expressed as percentages. •The retaining wall backfill material was tested and found to be compacted to at least 90percent of the Maximum Dry Density. Laboratory Tests The maximum dry density and optimum moisture content of the predominate soils encountered in the earthwork were performed in our laboratory by ASTM Test Designation D 1557. The results of these tests are presented on the attached Figure No. 1. Job No. 18-7072-FC May 21, 2024 Conclusions It is the opinion of C. W. La Monte Company Inc. that the retaining wall base soils: 1.Are in substantial conformance with those in the Soils Investigation. Page3 2.Retaining Wall soil excavations extend to the proper depth and are embedded on suitablematerial.3.Compacted soil placement has been observed and tested and backfill addressed by thisreport has been constructed substantially in accordance with the recommendations andthe construction plans for the project.4.This opinion is based upon our observations of the earthwork operations, the results ofthe density tests taken in the field, and the maximum density tests performed in ourlaboratory. Maintenance Considerations Compacted backfill is an integral component of the construction. The soil backfill was placed and compacted as designed will not be disturbed by landscaping or other improvements over the backfilled area. Bearing Capacity The proposed retaining wall area may be designed with a safe allowable bearing capacity of 2,000 pounds per square foot (psf). Limitations The descriptions, conclusions and opinions presented in this report pertain only to the work performed on the subject site during the period May 7, 2024 thru May 10, 2024. The fills observed and tested were limited to the zone for the residence area. As limited by the scope of the services that we agreed to perform, the conclusions and opinions presented herein are based upon our observations of the work and the results of our laboratory and field tests. Our services were performed in accordance with the currently accepted standard of practice in the region in which the earthwork was performed, and in such a manner as to provide a reasonable measure of the compliance of the described work with applicable codes and specifications. With the submittal of this report, no warranty, express or implied, is given or intended with respect to the services performed by our firm, and our performance of those services should not be construed to relieve the grading contractor of his responsibility to perform his work to the standards required by the applicable building codes and project specifications. The firm of C.W. LA MONTE COMPANY, INC. shall not be held responsible for fill soils placed at any future time, existing un-compacted fills or subsequent changes to the site by others, which directly or indirectly cause poor surface or subsurface drainage and/or water erosion Job o. 18-7072-FC May 21, 2024 Page4 altering the strength of the compacted fill soil. Professional opinions presented herein have been made based on our tests, observations and experience and they have been made in accordance with the generally accepted current geotechnical engineering principals and practices. This warranty is in lieu of all other warranties, either expressed or implied. Thank you for this opportunity to be of service. ShouJd any questions arise concerning this report, do not hesitate to contact our office. Reference to our will help to expedite a reply to your inquiries. Respectfully submitted, Cliffo . La Monte, RCE 25241, GE 495 PLOT PLAN � 'SHEET 4 SHEIT 5 --+:w-1-... BEi.LAViSTA MAP 2162 ;.. 7 1, 'i Liil �\Jf ll .\ -\I JL � 2§. ]' "isatJ!N,I 1 r/ /1 I 4 I .. ,.. L I I �J4!'!�----7,·-·:-··r··-----r-·----f.!.--.i------7'_J_ -'-- -;- - ---,- --1:---:r--A I_ : _ 1--.., /' / .._a,7• / I Al'N',l,HOtl,-IU ""''" / _,. I I I ;,.,_'( •I I I I I • I I ' I I ··•r.�'/'.-1 -;,-...,/_, //,: / •,-., II I "'----i' / 1' / f II ' / ( ' ti I I\ I I ' I /, "bJ. I ::� ,-f / I / \_�✓--/ � •• ;t 1 / r-*-1 , / t I: J ,I ' 1 '. !/ 1-----...__ .1_· , --r -�--� / � '-I • �--! I I I/ ---%• ,l -"'/ ' , •--. f I / --.___/f.l =:==" � / I f--J_ �..::.=,"' -t� 2$ t -;,-I �� 7-,-1----- t 11 �-200-08 FITT �-..., ;; -- --... .J� ; /: I I • <0 f i i LEGEND L:=:� .. c::�:si-.:::-. , __ 1._ ___ 1_ __ )_:J7t___:/ _______________ __---ir-.,..,.-_"" / ����-----.r=-�\-��-;:.. I I AI/JAJNr JIOW,'(f mMl"M,._tl« .......... ,._ PISMll"t:t'IMIEOIINII ........... , Approximate Field Density Test Location @ Area of Compacted Fill That is the Subject of This Report✓,--------' ... , I \C.W. La Monte Company Inc.I \ \ I ' J ... _______ ,,, Church Residence 4475 Adams Street Carlsbad, CA, 92008 Soil and Foundation Engineers Job No. 18 7072 FC Figure No. 1_ FG MAXIMUM DENSITY CURVE 145 \ ' \ ' 2.9 \ I'. •, \ ·,: .8 •. \ \ \ \ 140 \ l_.l. \ ' \ \ ' ' ,� ' ' ' Soil Type 1 I\ ', ' \ ' ' 135 \ \ ' ' '; '· ' ', ' ' r, ' ' ' ' '· " , ... r, ' ' \ -• � ,, 130 ' ' :.I ,, �-' ' , '' "· ' I ' ' ·,·-' ' ' " ' 'C) ' 5 125 ,, ' ' ' ' ' .... ', ' ' ' I". ' I', ' I', ' " eo " i ,. " ' ,. ' '· ' ...... 120 ' "· ', '\ ' ' ·s ' ' ' ' I'. ', ' ' ' ' ", �-'·' ' ' ' ' � ..' ' ' ' '· ' 115 ,, ' ' ' I'. ,_ ' ' ' ' ' ' �-', ,_ -"'', ' ', ' 110 ' ' '· ' I'. ' ' -. " ·-' " ' ' ' � ' I'. ,. ' ' ' ,_ ----; ' ',._ ' ' ' ,_ ' 105 ' ' ',,', ' ', ' ' I', ' ' ' ·--0: ' ' ' ' ' i--, 100 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Soil Moisture(%) Soil Description Optimum Maximum Type Moisture (%) Density (Pct) 1 Brown to Tan Fine to Medium Sand 10.5 130.0 New Residence Retaining Walls Project: 4475 Adams Street C.W. LA MONTE COMPANY INC.Carlsbad, CA. Soil and Foundation Engineers Job No. 18 7072 FC I Figure 3 REPORT OF CONSTRUCTION OBSERVATIONS AND FIELD DENSITY TESTING Geo Grid and Garage Area Retaining Walls 4475 Adams Street Carlsbad, Ca. 92009 JOB NO. 18-7072-FC September 18, 2024 Prepared For: Mr. Barry Church C/o Mc Cullough Design and Development, Inc. 10531 4S Commons Drive, Suite #700 San Diego, CA. 92127 Prepared by: C.W. LA MONTE CO. INC7840 El Cajon, Suite "200"La Mesa, CA. 91942 (619)462-9861, Fax (619) 462-9859 September 18, 2024 CITY OF CARLSBAD C.W. LA MONTE CO. INC Soil and Foundation Engineering Services Engineering and Development Department Building Inspection Section 1200 Carlsbad Village Drive Carlsbad, Ca. 92008 JOB NO. 18-7072-FC SUBJECT: REPORT OF CONSTRUCTION OBSERVATIONS AND RELATIVE FIELD DENSITY TESTING Dear Sirs: Residence Geo Grid and Garage area Retaining Walls 4475 Adams Street Carlsbad, Ca. 92008 In accordance with the contractors' request C. W. La Monte Company, Inc. has prepared this report to summarize our observations of the retaining wall backfill at the above subject site. We hereby present the results of density tests performed in the fill that was placed during the wall backfill operations. The observation and testing services addressed by this report were provided during the period of June 24, 2024 thru August 29, 2024 for the residence Geo Grid and Garage area retaining walls area. Scope of Work Services provided by C.W. La Monte Company, Inc. during the course of the earthwork consisted of the following: 1.Inspection of the retaining walls foundation excavations for conformance to Soils Report. 2.Performance of laboratory Maximum Dry Density and optimum moisture determinationson the soils placed and compacted for the residential Geo Grid and Garage area retainingwalls to verify proper compaction. 3 Performing field density testing of the placed and compacted base fill. 4 Preparation of this report. Job No. 18-7072-FC September 18, 2024 Page 2 General Site Information The property is accessed from the south side of Adams Street in the southeast area of the city of Carlsbad. The retaining walls were constructed for the driveway and garage for the north side of the residence as shown on the plans provided. Plan Reference In order to augment our understanding of the designed configuration of the residence retaining wall area, a site plan for the residence was obtained from the Contractor for our use. Figure No. 1 of this report is a modification of the plan provided to us to record the approximate location of our field density tests from field measurements. Field Observations Tests and observations were provided by a representative of C.W. LA MONTE COMPANY IN CORPORA TED. The presence of our field representative at the site was to provide to the client a source of professional advice, opinions, and recommendations based upon the field representative's observations of the contractors work and did not include any superintending, supervision, or direction of the actual work of the contractor's workers. Materials used to backfill the retaining wall consist primarily of tan to brown silty fine to medium sand backfill. These materials meet or exceed the design specifications referred to in the approved plans. The site is underlain at depth with competent formational material. The soil conditions were as anticipated. Field Tests Field density tests were performed in accordance with A.S.T.M. D-1556 guidelines. Maximum density determinations were performed in accordance with A.S.T.M. D-1557, Method A guidelines. The relative compaction results, as summarized on Figure No. II, are the ratios of the field densities to the laboratory Maximum Dry Densities, expressed as percentages. •The backfill material for the retaining walls was tested and found to be compacted to atleast 90 percent of the Maximum Dry Density. Laboratory Tests The maximum dry density and optimum moisture content of the predominate soils encountered in the earthwork were performed in our laboratory by ASTM Test Designation D 1557. The results of these tests are presented on the attached Figure No. I. Job No. 18-7072-FC September 18, 2024 Conclusions It is the opinion of C. W. La Monte Company Inc. that the retaining walls base soils: 1.Are in substantial conformance with those in the Soils Investigation. Page 3 2.Retaining Wall soil excavations extend to the proper depth and are embedded on suitablematerial.3.Compacted soil placement has been observed and tested and backfill addressed by thisreport has been constructed substantially in accordance with the recommendations andthe construction plans for the project.4.This opinion is based upon our observations of the earthwork operations, the results ofthe density tests taken in the field, and the maximum density tests performed in ourlaboratory. Maintenance Considerations Compacted backfill is an integral component of the construction. The soil backfill was placed and compacted as designed and will not be disturbed by landscaping or other improvements over the backfilled area. Bearing Capacity The proposed retaining walls area may be designed with a safe allowable bearing capacity of 2,000 pounds per square foot (psf). Limitations The descriptions, conclusions and opinions presented in this report pertain onJy to the work performed on the subject site during the period June 24, 2024 thru August 29, 2024. The fills observed and tested were limited to the zone for the residence area. As limited by the scope of the services that we agreed to perform, the conclusions and opinions presented herein are based upon our observations of the work and the results of our laboratory and field tests. Our services were performed in accordance with the currently accepted standard of practice in the region in which the earthwork was performed, and in such a manner as to provide a reasonable measure of the compliance of the described work with applicable codes and specifications. With the submittal of this report, no warranty, express or implied, is given or intended with respect to the services performed by our firm, and our performance of those services should not be construed to relieve the grading contractor of his responsibility to perform his work to the standards required by the applicable building codes and project specifications. The firm of C.W. LA MONTE COMPANY, INC. shall not be held responsible for fill soils placed at any future time, existing un-compacted fills or subsequent changes to the site by others, which directly or indirectly cause poor surface or subsurface drainage and/or water erosion II I Ii I i i }. fI II i /f Ill I • I /oJ•' I / 11, ... j La# -.j-JlJ-+---<J '•. I, _/ 1.�-· Ari : ·-I / II I /,1 I /11 /l LEGEND: Approximate Location of Field Density Test Approximate Limits of Compaction © I-;_�-: .• , . , I C.W. LAMONTE COMPANY, INC.Soil and Foundation Engineers Site Plan EXISTING ADJACENT RESIDENCE �=-�--,-----;r-::.;;1=�--7L1-�r-r1 ---11-�-/. // I I I I • I / : / , \\I I I '/' :;:i,·,c•�� � <::J \ \ \ \ I/"' / I PR()l'08£D �'- . � �- . " \ \ \ \ \ ,' \ \ ,r,J::.w:,:_,/ RS1DENCE }!••,. [BJ \ \ \' \.. / I ::,:::. /,'� {i_ .-· \ \ \ \ , 1/ \ //, ;j�.:;.•_.:.<:-':I -' \ �".: .... ,_ I /..' I I\·' I/� I I I { I .. \ .l l _L_ l __ J __ V --,� r--r-. 1 T � 1-.-1 wu.:i 'f -·�™r�'l.��J&h�.t')�:���--l11 tiitil1Us�:·�---Cf;;;;.fM•Nfn-... � -\ \ }, l I I , ,i ., @I \ 1 \ 1 1 I ::- I I I :___�---;::::rs---7 I EXISTING I I AO-""CENT RESIDENCE NOTE: All dimensions are approximate and should not be usedfor legal purposes. Project: Church Residence Geo Grid Wall and Retaining Wall 4475 Adams Street Carlsbad, CA. Job No. 18 7072 FC Figure No.1 Test No. Date 1 8/6/2024 2 8/6/2024 3 8/6/2024 4 8/7/2024 5 8/7/2024 6 8/7/2024 7 8/7/2024 8 8/16/2024 9 8/19/2024 10 8/19/2024 11 8/23/2024 12 8/26/2023 13 8/28/2024 14 8/28/2024 15 8/29/2024 16 8/29/2024 Location Elev. (feet) or Soil Type Moisture Dry Fill lbickness (%) Density (pd) see fi=e 1 2' 1 8.0 117.2 see fi=e 1 4' 1 8.0 117.2 see figure 1 6' 1 8.0 117.0 see figure 1 FG 1 7.0 117.2 see fowre 1 8' 1 9.0 117.2 see fi=e 1 FG 1 12.0 118.4 see fi=e 1 FG 1 10.0 117.2 see fi=e 1 0 1 14.0 119.2 see figure 1 2' 1 9.5 118.0 see figure 1 4' 1 9.5 127.9 see figure 1 6' 1 9.5 127.8 see fowre 1 8' 1 9.5 119.1 see figure 1 10' 1 6.5 118.0 see fowre 1 12' 1 9.0 124.0 see fi=e 1 FG 5.0 117.5 see figure 1 2' 7.0 121.0 Max. % Relative Density Compaction (pd) 130.0 90.2 130.0 90.2 130.0 90.0 130.0 90.2 130.0 90,2 130.0 91.1 130.0 90.2 130.0 91.7 130.0 90.8 130.0 98.4 130.0 98.3 130.0 92.0 130.0 91.0 130.0 95.4 130.0 90.4 130.0 93.1 :mil Type Description Optimum Moisture Maximum Dry Density (%) (pcf) Brown to Tan Fine to Medium Sand 10.5 130.0 Job No. 18 7072 FC Figure 2 MAXIMUM DENSITY CURVE 145 \ ' \ ' 2.9 \ \ \ \ ' -� \ \ \ ', 140 \ l. '\ ', \ \ \ \ ,. \ ,,, Soil Type I ' ., \ ' \ \ 135 \ ' \ ', \ \ r, \ ', \ \ r, \ •. \ ' \ \ ,, r. \ � r, \ \ \ \ , ... "· 130 \ \ ' , "' ', I', \ � ', \ '· \ ' ' r--\ r, C \ ,, ' ' \ (.) \ " \ 8 125 ,, ' \ ' ' \ ' \ ..... ', \ \ \ '· ..c ' I', ' I', . " " ' I' ·,r. \ ' ' ' I',' ·,' ... ' ·o 120 ' ... ' ' 1' ·,... ' ' '', ' e.'' ... ' "' \ ' ' ' r, ' r--, ' I' 115 ... " I' •. ... " ' " ... " " ... ' r. ' r, ' ', " ' ... ' I'-1 I 0 ... ' ' •. ,, I"-' ... I'-... I', ',... ... ' •. ,, ' ' ' ' 105 ' ' ' "· r--, ·,' ' "-' ' ' ' ' " JOO C, ' 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Soil Moisture(%) Soil Description Optimum Maximum Type Moisture (%) Density (Pct) I Brown to Tan Fine to Medium Sand 10.5 130.0 Chruch Residence Project: Geo Grid Wall and Retaining Wall 4475 Adams Street C.W. LA MONTE COMPANY INC.Carlsbad, CA. Soil and Foundation Engineers Job No. 18 7072 FC I Figure 3 APPENDIX "A" Page I WET WEATHER MAINTENANCE AT RESIDENTIAL SITES* Southern Californians, unlike other residents of the nation, are unaccustomed to heavy rainfall. Whenever unusually wet weather occurs, San Diegans, particularly those living on slopes of filled land, become concerned (often unduly) about the conditions of their building site. They should not be, generally. The grading codes of the County of San Diego, and the various incorporated cities in the County, concerning filled land, excavation, terracing, and slope construction, are among the most stringent in the state, and adequate to meet almost any natural occurrence. This is the opinion of the San Diego Chapter of the California Council of Civil Engineers and Land Surveyors, whose membership help prepare and review the codes. In 1967, the local Chapter of the California Council of Civil Engineers and Land Surveyors compiled a list of some precautions that homeowners can take to maintain their building sites. This updated pamphlet reiterates those precautions. Everyone is accustomed to maintaining his house. Everyone realizes that periodic termite inspections are a reasonable precaution, and that homes require a coat of paint from time to time. Homeowners are well used to checking and replacing wiring and plumbing, particularly in older homes. Roofs require occasional care. However, the general public regards the natural ground as inviolate. They ought to realize that Nature is haphazard in creation of all land, some of which becomes building sites. Nature's imperfections have been largely compensated through careful engineering design and construction and enforcement of rigorous building and lot development ordinances. It is only reasonable to assume that an improved building site requires the approximate same care that the building itself does. In most instances, lot and site care are elementary steps that can be taken by the homeowner at considerably less cost than building maintenance. As a public service, engineers in private practice of the San Diego Chapter of the California Council of Civil Engineers and Land Surveyors have compiled this pamphlet of pertinent Do's and Don'ts as a guide to homeowners. The CCCELS respectfully advises that, in offering these guides, it accept no responsibility for the actual performances of home sites or structures located thereon. *Pamphlet prepared by the San Diego Chapter of the California Council of Civil Engineers and Land Surveyors into