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Home My WebLink AboutCDP 2020-0044; GIBSON FAMILY RESIDENCE; FINAL SOILS REPORT; 2023-11-10ru\ VINJE & MIDDLETON ENGINEERING, I NC. Ref Job #21-252-F November 10, 2023 Mr. Curt Gibson 4285 Hillside Drive Carlsbad, CA 92008 2450 Auto Park War Escondido, California 92029-1229 Phone {760) 743-1214 F.u {760) 739-0343 FINAL GRADING CERTIFICATION REPORT FOR RESIDENTIAL DEVELOPMENT CORNER OF HILLSIDE DR. & PARK DR. CARLSBAD. CA. GRADING PERMIT NUMBER GR2021-0009 References: Geotechnical Investigation, proposed residential development, southwest corner of Hillside Drive and Park Drive, Carlsbad, California, V & M Job #20-178-P, report dated August 18, 2020 Grading Plans For: Gibson Family Residence, CDP 2020-0044, bha, inc. 9/26/2022. A portion of the recent plans were used to develop our included plate 1. The subject property consists of a corner lot located southwest of the intersection of Hillside Drive and Park Drive within the City of Carlsbad. The approximate site coordinates are 33."N latitude and 117. 0 W longitude. This report is provided to certify the completion of grading for the subject property, within the portion of the right of way indicated on attached Plate1 .The subject area is suitable for the support of the intended drainage course from a geotechnical standpoint. The current grading was conducted from November 2022 thru September, 2023 with intermittent observation and field density testing by representatives from our company under the supervision of the undersigned. Additional density testing was provided for information only of work observed, supervised and approved by the City Inspector Nick Deletto. The property was originally planned for the support of a single-family residential development and associated improvements. Due to unforseen circumstances the associated improvements as shown on the approved grading plan may need to be modified and completed at a later date. Consequently, this report is limited to the portions of proposed grading currently completed and partially completed areas which have been approved for fill. The City of Carlsbad has indicated that the building envelope plus 5 foot perimeter may be certified separately so that the construction of the proposed residence may begin. Import soils were required to complete the building pad. Additional laboratory testing was conducted as needed and the results confirm that import soils are substantially similar to the on site soils with respect to geotechnical properties. Therefore the foundation and soil design parameters provided in our referenced geotechnical report are still appropriate. Mr. Curt Gibson January 6, 2022 Page2 A portion of the approved Grading Plan has been reproduced and includes herein as Grading limits and compaction test location map Plate 1. The approximate limits of compacted fill and locations of field density tests are plotted thereon. Site remedial grading consisted of removal and re-compaction of near surface onsite soils and which were all placed upon approved competent bottom of removals or Tensar BX 1200 geogrid which was used over the exposed bottom of removals at west 3/4 of meandering drainage scale which lacked density or consistency. All fills placed were tested in accordance with ASTM 0-6938 Nuclear Gauge. All tested areas met 90% of the maximum dry density requirement as determined by ASTM 0-1557 Like all graded building sites, the proper control of site surface drainage is critical to overall stability of the project graded surfaces and embankments, as well as continued performance of the new developed areas. Surface water should not pond upon graded surfaces nor be allowed to flow over top of graded slopes. This report should be considered valid for a period of one year and is subject to review by our firm following that time. If significant modifications are made to your tentative reconstruction plan, especially with respect to the height and location of cut and fill slopes, this report must be presented to us for review and possible revision. Vinje & Middleton Engineering, Inc., warrants that this report has been prepared within the limits prescribed by our client with the usual thoroughness and competence of the engineering profession. No other warranty or representation, either expressed or implied, is included or intended. Should any questions arise concerning this report, please do not hesitate to contact this office. Reference to our Job #21-252-F will help to expedite our response to your inquiries. We appreciate this opportunity to be of service to you. VINJE & MIDDLETON ENGINEERING, INC. \'1:-.:-ic & MJDDI.-CTON Er-.GINCCRJNG, lr-:c. • 2450 Auto Park Way • Escondido, California 92029-1229 • Phone (760) 743-1214 GRADING LIMITS AND COMPACTION TEST LOCATION MAP 5285 HILLSIDE DRIVE, CARLSBAD CA. 92008 HILLSIDE DRIVE LEGEND @ APPROXIMATE LOCATION OF FIELD DENSITY TEST ~ APPROXIMATE LIMITS OF COMPACTED FILL Vinje & Middleton Job# 21-252-F PLATE 1 JOB NO: 21-252-F NAME: Gibson LOCATION: 4285 Hillside Drive, Carlsbad Field Density Tests Results: Remedial Grading Date Test 2023 No. Location 8/11 I West ½ meandering drainage swale 8/11 2 West ½ mcundering druinagc swalc 8/11 3 West ½ meandering drainage swalc 9/1 I 4 Storm drain catch basin 9/12 5 Storm drain catch busin 9/12 6 North of Bio Basin 9/12 7 North of Bio Basin Approx. Test Elev. (ft) 72.5 73.5 75.5 73.0 74 74 73 % Field Dry Max Dry % Field Density Pcf Density Relative Comments Moisture Per Comp. 11 116.9 127.7 92 11 116.1 127.7 91 10 I 16.1 127.7 91 Finish Grade 9 I I0.7 121.0 91 9 120.4 127.7 94 Finish Grade 9 122.8 127.7 96 Finish Grade to 120.2 127.7 94 Maximum Dry Density/Optimum Moisture Content, ASTM D-1557: Soil Type: 8 Light Tan fine to medium silty sand Maximum Dry Density: 121.0 pct Optimum Moisture: 12.5 % Soil Type: 6 Tan brown fine to medium silty sand Maximum Dry Density: 127.7 Optimum Moisture: 9.5 FIELD REPORT DATE JOB NO VINJE & MIDDLETON ENGINEERING, INC. 2450 Auto Park Way ESCONDIDO, CALIFORNIA 92029-1229 ~o q 2."3 '2.-\ -2.52.-~ PROJECT s.~. 0-.., sD ~c~tl Phone: (760) 743-1214 LOCATION Fax: (760) 739-0343 CONTRACTOR ro _...i....:Q~--'-rL..:C._____;GJ=-'--r_,_{_6--=--'-~b ..... zc""""'-'-{\-'--------Jo-e.. Uri'\. OWNER WEATHER PRESENT AT 51TE THE FOLLOWING WAS NOTED: > DY\ 5 ~+e, o..s aq v:e.s:-t:ed k?"j Mr-. 6. i,w"' :En r cl ~m\ ~ --H?&n Vlj a-f 1/Y\D.hc;,ex:w.a h"'ck.:6ll 0\.,...-cv~ E. £\) 'Dt>)G cu\ v~r-➔ a.ad loe.-h~ ;.J fu 1 \:<a ±§) me-e.A ".'}014 CoM pac±iot1 ve9 vtce. men:+ duJt ±D low Cba-,s::b1Y•eq £,9¥5±::ed ±12 tJe..M?t:t. btz:foce W1cr:e imped 91cr::1ves: ti\ od ~pu 4 i ti/ G1 d fu c: n e.sc:t ?I,, ~S\± -h..g I Ji tl ca U > INEEAIENG. GEOLOGIST RCE/GEICEG NUMBER CUENT REPRESENTATIVE -~i); ~ ARRIVE LEAVE HOURS ON SITE HOURS TRAVEL OVERTIME PHOTOS c): '3o lL .:-'30 l THIS REPORT DOES NOT RELIEVE THE CONTR OF HIS RESPONSIBILITY TO BUILD PER THE PLANS. SPECIFICATIONS AND ALL APPLICARI F r.nnF~ ~ VINTE & MIDDLETON ENGINEERING, INC. Ref Job #21-252-F January 6, 2022 Mr. Curt Gibson 7089 Leeward Street Carlsbad, CA 92011 2450 Auto Park War Escondido, California 92029-1229 Phone (760) 743-1214 Fax (760) 739-0343 INTERIM GRADING CERTIFICATION REPORT FOR RESIDENTIAL DEVELOPMENT CORNER OF HILLSIDE DRIVE & PARK DRIVE CARLSBAD, CALIFORNIA GRADING PERMIT NUMBER GR2021-0009 References: Geotechnical Investigation, proposed residential development, southwest corner of Hillside Drive and Park Drive, Carlsbad, California, V & M Job #20-178-P, report dated August 18, 2020 Grading Plans For: Gibson Family Residence, CDP 2020-0044, bha, inc. 8/17/2021 . The subject property consists of a corner lot located southwest of the intersection of Hillside Drive and Park Drive within the City of Carlsbad. The approximate site coordinates are 33. 0 N latitude and 117. 0 W longitude. This report is provided to certify the referenced building pad plus a minimum five foot perimeter as suitable for the support of the intended structure from a geotechnical standpoint. The current pad grading was conducted from September 14, 2021 thru December 17, 2021 with intermittent observation and field density testing by representatives from our company under the supervision of the undersigned. The property was originally planned for the support of a single-family residential development and associated improvements. Due to unforseen circumstances the associated improvements as shown on the approved grading plan may need to be modified and completed at a later date. Consequently, this report is limited to the portions of proposed grading currently completed and partially completed areas which have been approved for fill. The City of Carlsbad has indicated that the building envelope plus 5 foot perimeter may be certified separately so that the construction of the proposed residence may begin. Import soils were required to complete the building pad. Additional laboratory testing was conducted as needed and the results confirm that import soils are substantially similar to the on site soils with respect to geotechnical properties. Therefore the foundation and soil design parameters provided in our referenced geotechnical report are still appropriate. Mr. Curt Gibson January 6, 2022 Page 2 A portion of the approved Grading Plan has been reproduced and includes herein as Grading limits and compaction test location map Plate 1. The approximate limits of compacted fill and locations of field density tests are plotted thereon. Site remedial grading consisted of removal and recompaction of near surface onsite soils and importing fill soils which were all placed upon approved competent bottom of removals as indicated in our referenced preliminary soils investigation report. All fills placed were tested in accordance with ASTM 0-6938 Nuclear Gauge. Any areas which did not meet 90% of the maximum dry density requirement as determined by ASTM D-1557 were brought to the attention of the contractor for remedial efforts then retested to confirm proper compaction level. Like all graded building sites, the proper control of site surface drainage is critical to overall stability of the project graded surfaces and embankments, as well as continued performance of the new developed areas. Surface water should not pond upon graded surfaces nor be allowed to flow over top of graded slopes. This report should be considered valid for a period of one year and is subject to review by our firm following that time. If significant modifications are made to your tentative reconstruction plan, especially with respect to the height and location of cut and fill slopes, this report must be presented to us for review and possible revision. Vinje & Middleton Engineering, Inc., warrants that this report has been prepared within the limits prescribed by our client with the usual thoroughness and competence of the engineering profession. No other warranty or representation, either expressed or implied, is included or intended. Should any questions arise concerning this report, please do not hesitate to contact this office. Reference to our Job #21-252-F will help to expedite our response to your inquiries. We appreciate this opportunity to be of service to you. VINJI & MIDD I ION ENGINLLIUNG, INC.• 2450 Auto Park Way• Escondido, California 92029-1229 • Phonc (760) 743-1214 JOB NO: 21-252-F NAME: Curt Gibson LOCATION: 5285 Hillside Drive. Carlsbad TEST RESULTS: Maximum Dry Density/Optimum Moisture Content, ASTM 1557: * Soil Type :_1_ Brown-red brown fine sand Maximum Dry Density: 117.5 pcf Optimum Moisture: 9.0 % Soil Type :.1,_ Brown silty fine -med. Sand W /Trace clay Maximum Dry Density: 128.0 pcf Optimum Moisture: 10.5 % Soil Type :_3_ Brown silty fine -med. Sand Maximum Dry Density: 124.8 Optimum Moisture: .l.LQ_ % pcf Soil Type :_4 _ Brown clayey silty fine -med. Sand Maximum Dry Density: 127.6 pcf Optimum Moisture:..2&.._ % Soil Type :_5 _ Greyish white to tan silty sand w/ some clay ( Import ) Maximum Dry Density: 123 .5 pcf Optimum Moisture: 10.0 % Soil Type :_6_ Tan Brown silty fine to med. Sand w/gravel Maximum Dry Density: 127.7 pcf Optimum Moisture:..2i_ % Soil Type :_7_ Brown silty fine -med. Sand w/ gravel and trace Clay Maximum Dry Density: 127.5 pcf Optimum Moisture: J.!U.._ % Soil Type :_7_ Rock Corrected ( 11 % ) Maximum Dry Density: 130.8 Optimum Moisture: 9.6 % pcf • From our geotechnical investigation dated August 18, 2020 JOB NO: 21-252-F NAME: Curt Gibson LOCATION: 5285 Hillside Drive, Carlsbad Field Density Tests Results: Date Test Location 202) No. 9/16 1 Bottom Pad o.x. 9/17 2 Bottom Pad O.X. 9/18 3 South Keyway 9/20 4 South Keyway 9/20 5 South Keyway 9/20 6 South Keyway 9/20 7 South of House Pad 9/20 8 House Pad 9/21 9 South Keyway 9/21 10 South Keyway 9/21 11 House Pad 9/21 12 House Pad 9/21 13 House Pad 9/22 14 House Pad 9/23 15 House Pad 9/24 16 South Keyway Bottom O.X. 9/24 17 South Keyway 9/24 18 South Keyway 9/24 19 House Pad Approx. Test Elev. (ft) 68 67 64.5 66 66 67 67.5 68 69 68 68 69 67.5 68.5 69.5 67.5 67.5 69.5 69.5 % Field Dry Max Dry o;. Field Density Relative Comments Moisture Density Pcf Pcf Comp. 8 97.5 117.5 83 Test Failed Minimum 86% Required 9 104.5 117.5 88 Passed Retest #1 10 117.2 128.0 91 10 113.0 128.0 88 Test Failed 12 119.0 128.0 93 Retest#4 9 120.3 128.0 94 8 119.7 128.0 94 10 119.9 128.0 94 9 115.4 128.0 90 8 116.6 128.0 91 9 116.4 128.0 91 11 115.5 128.0 90 11 118.4 124.8 95 9 116.0 124.8 92 16 109.9 124.8 88 Test Failed 6 105.0 117.5 89 Minimum 86% Required 11 117.8 124.8 94 11 118.2 124.8 95 13 114.3 124.8 92 Date Test Approx. % Field Dry Max Dry o/e 2021 No. Location Test Field Density Pcf Density Relative Comments Elev. (ft) Moisture Pcf Comp. 9/24 20 House pad 69 13 113.6 124.8 91 9/24 21 House Pad 70 12 114.8 124.8 92 9/24 22 South of House Pad 69.5 13 117.9 124.8 95 9/27 23 South Slope 70 10 116.0 124.B 95 9/27 24 South Slope 69 11 117.5 124.8 93 9/27 25 House Pad 70.5 12 119.2 124.8 94 9/28 26 House Pad 71 10 119.8 124.8 96 9/29 27 House Pad Bottom O.X. 70 11 109.0 124.8 87 Minimum 86% Required 9/29 28 House Pad Bottom O.X. 65 8 111.4 124.8 89 Minimum 86% Required 9/29 29 South of House Pad 70.5 6 122.7 124.B 98 9/29 30 House Pad 71 8 121.5 124.8 95 9/29 31 House Pad 72 6 123.1 124.8 95 9/29 32 House Pad 67 8 113.6 124.8 91 9/30 33 South of House Pad 68 9 119.0 124.8 95 9/30 34 House Pad 71 12 118.1 128.0 92 10/1 35 House Pad 69 10 120.2 128.0 94 10/1 36 House Pad 72 8 127.3 128.0 95 10/1 37 House Pad 72 10 124.6 128.0 97 10/1 38 South Side Slope 72 11 122.3 128.0 96 10/1 39 South Side Slope 71 12 120.0 128.0 94 Date Test Approx. % Field Dry Max Dry o/e Location Test Field Density Relative Comments 2021 No. Elev. (ft) Moisture Density Pcf Pcf Comp. 10/4 40 House Pad Bottom O.X. 67 6 107.6 124.8 86 Minimum 86% Required 10/4 41 House Pad 68 10 116.3 124.8 93 10/4 42 House Pad 70.5 10 119.9 128.0 94 10/6 43 House Pad 69 10 118.0 128.0 92 10/6 44 House Pad 71 10 120.5 128.0 94 10n 45 House Pad 71 10 115.2 124.8 92 10n 46 House Pad 72 11 116.0 124.8 93 10n 47 House Pad 71 10 119.9 128.0 94 10n 48 House Pad 72 11 119.9 128.0 94 10n 49 House Pad 72 11 118.0 124.8 95 10/7 50 North of House Pad 72 9 116.5 124.8 93 10n 51 South Side Slope 71 10 115.0 124.8 92 10n 52 South Side Slope 71 10 116.1 124.8 93 10/14 53 North Side 69 10 116.3 128.0 91 10/14 54 South Side Slope 72 11 116.9 128.0 91 10/14 55 South Side Slope 72 10 116.4 128.0 91 10/14 56 House Pad 72 9 119.0 128.0 93 10/14 57 House Pad 72 7 116.9 128.0 91 10/15 58 North of House Pad 71 11 124.0 128.0 97 10/15 59 North of House Pad 69 13 114.4 128.0 89 Test Failed 10/15 60 North of House Pad 70 11 117.5 128.0 92 Retest#59 10/18 61 South Side Slope 73 11 118.4 128.0 93 10/18 62 South Side Slope 73 9 116.9 128.0 91 Date Test Approx. o/11 Field Dry Max Dry % 2021 No. Location Test Field Density Per Density Relative Comments Elev. (ft) Moisture Pd Comp. 10/18 63 House Pad 73.5 10 123.1 128.0 96 10/18 64 House Pad 73.5 10 117.4 128.0 92 10/18 65 House Pad 73.5 10 117.5 128.0 92 10/18 66 North of House Pad 72 11 118.4 128.0 93 10/18 67 House Pad 71 .5 11 119.5 128.0 93 10/20 68 House Pad 73.5 10 116.5 128.0 91 11/11 69 South of House Pad 73.5 6 119.0 128.0 93 11/22 70 House Pad 72.5 12 114.8 127.6 90 11/22 71 House Pad 74.5 12 109.9 127.6 86 Test Failed 11/22 72 House Pad 74.5 12 116.5 127.6 91 Retest #71 11/22 73 House Pad 74.5 11 115.1 127.6 90 11/22 74 House Pad 73 10 115.4 127.6 90 11/22 75 House Pad 75 8 110.9 127.6 87 Test Failed 11/22 76 House Pad 75 9 114.8 127.6 90 11/22 77 House Pad 75 10 113.3 127.6 89 Retest #75 Failed 11/23 78 House Pad 75 8 115.2 127.6 90 Retest#77 11/23 79 House Pad 70.5 8 111.6 123.5 90 11/23 80 House Pad 71 8 109.7 123.5 88 Test Failed 11/23 81 House Pad 71 8 109.7 123.5 90 Retest #80 11/23 82 North of House Pad 71.5 9 111.3 123.5 90 11/23 83 North of House Pad 72.5 8 111.0 123.5 90 11/24 84 North of House Pad 75 10 110.8 123.5 90 11/24 85 House Pad 76 8 111.3 123.5 90 Date Test Approx. % Field Dry Max Dry % 2021 No. Location Test Field Density Per Density Relative Comments Elev. (ft) Moisture Pcf Comp. 11/24 86 House Pad 76 7 111.8 123.5 91 11/24 87 House Pad 76.5 7 111 .6 123.5 90 F.G. 11/29 88 House Pad 74.5 8 111 .7 123.5 90 11/29 89 House Pad 76.0 9 112.2 123.5 91 11/29 90 House Pad 76.5 8 113.5 123.5 92 F.G. 11/30 91 House Pad 76.5 9 111.6 123.5 90 F.G. 11/30 92 House Pad 74.5 10 112.7 123.5 91 11/30 93 South of House Pad 75 7 110.9 123.5 90 11/30 94 House Pad 75 8 110.5 123.5 90 12/1 95 South of House Pad 76 9 110.8 123.5 90 12/1 96 House Pad 76.5 9 109.7 127.6 94 F.G. 12/8 97 House Pad 72 6 105.4 127.6 90 12/8 98 House Pad 73.5 9 112.4 127.6 94 12/8 99 House Pad 74.5 8 105.5 127.6 90 12/8 100 House Pad 75 8 108.6 127.6 92 12/10 101 Bio Basin Walls 72 9 111.5 127.7 87 Test Failed 12/10 102 Bio Basin Walls 72 11 118.0 127.7 93 Retest# 101 12/10 103 Bio Basin Walls 73 11 117.1 127.7 92 12/11 104 Bio Basin Walls 74.5 9 112.2 127.7 88 Test Failed 12/11 105 East of House Pad 74 10 115.8 127.7 91 12/11 106 Bio Basin Walls 74.5 11 114.4 127.7 90 Retest# 104 12/11 107 House Pad 76.5 10 117.8 127.7 92 F.G. 12/13 108 South of House Pad 76.5 8 114.6 127.7 90 F.G. Date Test Approx. % Field Dry Max Dry % Location Test Field Density Relative Comments 2021 No. Elev. (rt) Moisture Density Pcf Pcf Comp. 12/13 109 House Pad 76.5 10 114.8 127.7 90 F.G. 12/13 110 East of House Pad 75 9 116.8 127.6 92 12/15 111 East of House Pad 75 10 114.6 130.5 88 Test Failed 12/15 112 East of House Pad 75 10 121.6 130.5 93 Retest# 111 12/15 113 East of House Pad 75.5 10 118.0 130.5 90 12/15 114 East of House Pad 76 9 114.7 130.5 88 Test Failed 12/15 115 East of House Pad 76 10 118.4 130.5 91 Retest# 114 12/16 116 East of House Pad 74.5 11 113.9 130.5 87 Test Failed 12/16 117 East of House Pad 74.5 12 118.0 130.5 90 Retest# 116 12/16 118 North of House Pad 70 14 101.6 127.7 80 Test Failed 12/16 119 North of House Pad 70 12 115.7 127.7 91 Retest# 118 12/16 120 East of House Pad 75 10 117.6 130.5 90 12/16 121 North of House Pad 71 9 112.0 130.5 86 Test Failed 12/16 122 North of House Pad 71 10 114.9 130.5 88 Retest# 121 , Test Failed 12/16 123 North of House Pad 71 11 118.2 130.5 91 Retest# 122 12/16 124 North of House Pad 72 10 121.1 130.5 93 12/16 125 South of House Pad 76.5 11 119.4 130.5 92 12/16 126 North of House Pad 72.5 8 113.6 130.5 87 Test Failed 12/17 127 North of House Pad 72.5 12.5 115.3 130.5 88 Retest# 126 Test Failed 12/17 128 North of House Pad 72.5 12 116.8 130.5 90 Retest# 127 12/17 129 North of House Pad 74 11 119.1 130.5 91 12/17 130 North of House Pad 75 12 118.0 130.5 90 12/17 131 North of House Pad 76 12 111.6 127.5 88 F.G. Test Failed Date Test Approx. % Field Dry Max Dry O/o 2021 No. Location Test Field Density Per Density Relative Comments Elev,(ft) Moisture Pd Comp. I 12117 I 132 I North of House Pad I 76 I 11 I 117.3 I 130.5 I 90 I F.G. Retest# 131 I GRADING LIMITS AND COMPACTION TEST LOCATION MAP w ...J 103 -..............\ -............_........._ I& L <( ~ -u Cl) 0 z ,,,,,,,,.,,. --......._ / I -----"-' ' 118 128127 119 122 126 123 121 131 124 83 84 67 59 129 132130 60 --1 63 90 / 4 82 13 5 92 22 23 80 12 rr I 31 30 81 ~l, 54 I 61 I 3 91 87 21 49 8 14 94 29 r 1 51 19 25 r 11 7 76 I 2 15 I I 10 20 65 48 r 32 'I 95 86 56 34 35 I I 55 58 II 62 28 27 37 36 47 33 j-/'l 16 h7 89 II 93 I I ! 42 I .,, 2 " 46 • 72 45 71 57 I 41 64 44 n 43 40 u I 118 75 77 LEGEND 21 APPROXIMATE LOCATION OF FIELD DENSITY TEST D APPROXIMATE LIMITS OF COMPACTED FILL PLATE 1 VJNJE & MIOOLETON ENGWEERINO J08 I 21-252-F