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Home My WebLink AboutCT 00-06; BRESSI RANCH; 2004 GEOTECHNICAL COMPLETION LETTER OF THE ROUGH AND FINE-GRADING OPERATIONS (VARIOUS DATES); 2004-04-28L1LUN t'j U U Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY November 17, 2004 Project No. 4971009-028 To: Greystoiie Homes 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Mr. Keith Randhahn Subject: Geotechnica] Completion Letter of the Rough and Fine Grading Operations, Lots 35 through 39, 50 through 54, 117 through 126, 144 through 153, 173 through 179, 194 through 200, 285 through 297, 337 through 317, 368 through 373, and 412 through 420, Planning Areas PA-6 through 10, Brest'. Ranch, Carlsbad, California Reference: Leighton and Associates, 2004, As-Graded Report cf Rough and Fine Grading, Lots I through 515, Planning Areas PA-6 through PA-10 A-12, OS-I, and OS-3, Bressi Ranch, Carlsbad Tract No. 00-06, Carlsbad, California, Project No. 971009-014, dated August 18, 2004, revised August 31, 2004 In accordance with the request and authorization of reprcsentati .'es of Greystone Homes, we have performed geotechnical observation and testing services dun g the rough and fine grading operations for the Phase 2 residential construction lots (i.e. Lots 15 through 39, 50 through 54, 117 through 126, 144 through 153, 173 through 179, 194 throulh 200, 285 through 297, 337 through 347, 368 through 373, and 412 through 420 of Planning .reas PA-6 through 10) of the Bressi Ranch project, located in Carlsbad, California. As of the (I;'te of this letter, the rough and fine grading operations are essentially complete 'for the lots jj,: ted above. The geotechnical conditions encountered during rough and fine grading operations we: 'e generally as anticipated. The rough and fine grading operations included: 1) cuts and fills xi achieve the design grades, 2) removal of potentially compressible surficial materials (includin' undocumented fill, topsoil, colluvium, alluvium, landslide deposits, and weathered forrnz.t anal material) to competent formational material; 3) construction of canyon subdrains; 4) the c( istruction of buttresses and/or stability fills of slopes or hillsides containing landslides or other ad'erse geologic conditions; and 5) the construction of retaining walls and the placement and con paction of the retaining wall backfill soils. 3934 Murphy Canyon R: ,ad, Suite B205 e San Diego, CA 92123-4425 858.292.8030 • Fax 658.292.0771 • www.leightongeo.com 14:U IAA ZVZ UO LE (H1ON J003 97100g-028 The placement and compaction of the fill soils were geotechnic: ally observed and documented. Field density testing indicated that the fill and backfill soils were: )laced and compacted to at least 90 percent relative compaction (based on ASTM Test Method Dl 57) and near-optimum moisture content in accordance with the recommendations of Leighton and kssociates and the requirements of the City of Carlsbad. The rough and fine grading operations for Lots 35 through 39, f ) through 54, 117 through 126, 144 through 153, 373 through 179, 194 through 200, 285 thry .gh 297, 337 through 347, 368 through 373, and 412 through 420 of Planning Areas PA-6 througi 10 of the Bressi Ranch project were performed in general accordance with the project gec ;echnical reports, geotechnical recommendations made during grading, and the City of Ca isbad requirements. It is our professional opinion that the subject lots are suitable for the inter Jed residential use provided the recommendations included in the project as-graded geotechnical :eport (Leighton, 2004) and the other applicable project documents are incorporated into the tesign and construction of the residential structures and associated improvements. If, you have any questions regarding our recommendations, lease contact this office. We appreciate this opportunity to be of service. Respectfully submitted, I.FJCi1-ITON AND ASSOCIATES, INC. Randall K, Wagner, CEO 1612 Senior Assoc ate Distribution: (8) Addressee 4 -2- Leighton F R ;W Leighton and Associates, Inc. A kEIGHTON GROUP COMPANY September 24, 2004 Project No. 4971009-027 To: Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Mr. John Slatton Subject: Geotechnical Completion Letter of the Rough and Fine-Grading Operations, Planning Area OS-2 Park Site, Bressi Ranch, Carlsbad, California In accordance with the request and authorization of representatives of Lcnnar Communities, we have performed geotechnical observation and testing services during the rough and fine grading operations for the Planning Area OS-2 Park Site at the Bressi Ranch project (Carlsbad Tract No. 00-06) located in Carlsbad, California. As of the date of this letter, the rough and fine grading operations are essentially complete for the park. An as-graded geotechnical report of the rough and fine grading of Planning Area OS-2 is currently being prepared and will be provided under separate cover. The geotechnical conditions encountered during rough and fine grading operations of the park site were generally as anticipated. The rough and fine grading operations included: 1) minor cuts and fills of the existing sheet-graded site (that consisted of compacted fill and competent formational material) to achieve the design grades; 2) the overexcavation of the cut/fill transition within the building pad on the southern portion of the park; 3) processing of areas to receive fill; 4) construction of a 2:1 (horizontal to vertical) fill slope at the southwest corner of the park; and 5) the placement and compaction of fill. The placement and compaction of the fill soils were geotechnically observed and documented. Field density testing indicated that the fill soils were placed and compacted to at least 90 percent relative compaction (based on ASTM Test Method Dl 557) and near-optimum moisture content in accordance with the recommendations of Leighton and Associates and the requirements of the City of Carlsbad. 3934 Murphy Canyon Road, Suite B205wSan Diego&A 9212344..5. 858.292.8030 v Fax 858.292.0771 111 w iéIghtopgeorr . r- - r .L ' . - . - . - -. -. - 971009-027 The rough and fine grading operations for the Planning Area OS-2 Park Site at the Bressi Ranch project were performed in general accordance with the project geotechnical reports, geotechnical recommendations made during grading, and the City of Carlsbad requirements. It is our professional opinion that the subject site is suitable for the intended use provided the recommendations included in the project geotechnical reports are incorporated into the design and construction of the park site structures and associated improvements. If you have any questions regarding our recommendations, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC. 4 Kuy Randall K. Wagner Senior Associate Distribution: (2) Addressee (2) Lennar Communities, Attention: Mr. Jim Urbina (2) City of Carlsbad, Public Works Department, Attentiom Mr. Casey Amdt "'.LQ.YUl jU,) j'4t OUU LZ I kyn I VIN LPJUU Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY July 19, 2004 Project No. 971009-025 To: Greystone Homes 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Mr. Keith Randhakin Subject: Geotechnical Completion Letter of the Fine Gradi tg Operations for the 1Jffordab17 iko—usiTi-g-5i~iF,—T~u—ii4i i i_Np.JJrough 107c 'arisbad Tract No CT 03-03, Northwest Portion of P1 ijAreaEAi5,Bre:;i Ranch, Carlsbad, California Reference: Leighton and Associates, 2004, As-Graded Rep: rt of Fine Grading, Affordable Housing Site, Carlsbad Tract No. CT 03-03, NOT :hwest Portion of Planning Area PA-IS, Bressi Ranch, Carlsbad, California, dated June 25, 2004 In accordance with the request and authorization of represent dives of Greystone Homes, we have performed geotechnical observation and testing services iring the fine grading operations for ldisN1ih ugliioo the northwest portion of Planning ArPfjf the Bressi Ranch project (Carlsbad Tract No. CT 03-03), located in Carlsbad, California. As of the date of this letter, the fine gi ading operations are essentially complete for the site. The geotechnical conditions encountered during the fine grading operations were generally as anticipated. The fine grading operations included the overexcavation of the vr;uiti-unit building pads containing cut and cut/M) transition conditions, minor excavation of formational material in the proposed cut areas and the placement of minor fills to achieve the design grade . The placement and compaction of the fill soils were geotechnicaily observed and documented. Field density testing indicated that the fill soils were placed and compacted to at least 90 percir t relative compaction (based on ASTM Test Method D1557) and near-optimum moisture (:ontent in accordance with the recommendations of Leighton and Associates and the requiremer :s of the City of Carlsbad. The fine grading operations for the affordable housing site I within the northwest portion of Planning Area PA- i 5) of the Bressi Ranch project were perform d in general accordance with the 3934 Murphy Carivc -i Road, Suite B205 • Sari Diego, CA 92123-4425 858.292..030 • Fax 858,292.0771 • www.lelghtongeo.com LL I tin I VIN LPJ 003 QVUU 971009-025 project geotechnical reports, geotechnical recommendatons madt during grading, and the City of Carlsbad requirements. it is our professional opinion that the subject site is suitable for the intended residential use provided the recommendations included i ithe project geotechnical reports are incorporated into the design and construction of the resic ntial structures and associated improvements. If you have any questions regarding our recommendations please contact this office. We appreciate this opportunity to be of service. Respectfull' submitted, LEIGHTC'? AND ASSOCIATES, INC. Randall K. Wagrij, CEG 1612 Senior Asc iate Distribution: (2) Addressee 4 Leighton - i. ,-.'......- Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY April 28, 2004 Project No. 4971009-014 To: Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Ms. Kristine Zortman Subject: Geotechnical Completion Letter of the Rough and Fine-Grading Operations, Lots Ciou1 Planning Area PA-6, Bressi Ranch, Carlsbad, California In accordance with the request and authorization of representatives of Lenriar Communities, we have performed geotechnical_observation and testing services during the rough and fine grading operations forU f1ithroughlof Planning Area PA-6 of the Bressi Ranch project (Carlsbad Tract No. 00-06), located in Carlsbad, California. As of the date of this letter, the rough and fine grading operations are essentially complete for LL .i_ti ugh..63. The geotechnical conditions encountered during rough and fine grading operations were generally as anticipated. The rough and fine grading operations included: 1) cuts and fills to achieve the design grades; 2) the overexcavation of cut/fill transitions and cut lots containing highly expansive formational material and/or cemented zones; 3) removal of potentially compressible surficial materials (including undocumented fill, topsoil, colluvium, alluvium, landslide deposits, and weathered formational material) to competent formational material; 4) construction of canyon subdrains; and 5) the construction of buttresses and/or stability fills of slopes or hillsides containing landslides or other adverse geologic conditions. The placement and compaction of the fill soils were geotechnically observed and documented. Field density testing indicated that the fill soils were placed and compacted to at least 90 percent relative compaction (based on ASTM Test Method D1557) and near-optimum moisture content in accordance with the recommendations of Leighton and Associates and the requirements of the City of Carlsbad. To mitigate post-construction settlement, deep fills (i.e. areas where the fill soils are generally deeper than approximately 40 feet below the finish grade elevations of the site) were placed at a minimum 95 percent relative compaction. 3934 Murphy Canyon Road, Suite B205 • San Diego, CA 92123-4425 858.292.8030 • Fax 858.292.0771 • www.leightongeo.com 971009-014 The rough and fine grading operations for Lots 1 through 63 of Planning Area PA-6 of the Bressi Ranch project were performed in general accordance with the project geotechnical reports, geotechnical recommendations made during grading, and the City of Carlsbad requirements. It is our professional opinion that the subject lots are suitable for the intended residential use provided the recommendations included in the project geotechnical reports are incorporated into the design and construction of the residential structures and associated improvements. If you have any questions regarding our recommendations, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC. Randall K. Wagner, CEG 1612 Senior Associate Distribution: (2) Addressee (2) Lennar Communities Attention: Mr. Noah Lashbrook -2- Leighton A 2 R April 28, 2004 Project No. 4971009-014 To: Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Ms. Kristine Zortman Subject: Geotechnical Completion Letter of the Rough and Fine-Grading Operationsi[its In accordance with the request and authorization of representatives of Lennar Communities, we have performed geotechnical observation and testing services during the rough and fine grading operations for Lots 337 through 420 of Planning Area PA-JO of the Bressi Ranch project (Carlsbad Tract No. 00-06), located in Carlsbad, California. As of the date of this letter, the rough and fine grading operations are essentially complete for Lot 337 through 420. The geotechnical conditions encountered during rough and fine grading operations were generally as anticipated. The rough and fine grading operations included: I) cuts and fills to achieve the design grades; 2) the overexcavation of cut/fill transitions and cut lots containing highly expansive formational material and/or cemented zones; 3) removal of potentially compressible surficial materials (including undocumented fill, topsoil, colluvium, alluvium, landslide deposits, and weathered formational material) to competent formational material; and 4) construction of canyon subdrains. The placement and compaction of the fill soils were geotechnically observed and documented. Field density testing indicated that the fill soils were placed and compacted to at least 90 percent relative compaction (based on ASTM Test Method D1557) and near-optimum moisture content in accordance with the recommendations of Leighton and Associates and the requirements of the City of Carlsbad. To mitigate post-construction settlement, deep fills (i.e. areas where the fill soils are generally deeper than approximately 40 feet below the finish grade elevations of the site) were placed at a minimum 95 percent relative compaction. The rough and fine grading operations for Lots 337 through 420 of Planning Area PA-10 of the Bressi Ranch project were performed in general accordance with the project geotechnical reports, geotechnical recommendations made during grading, and the City of Carlsbad requirements. It is 3934 Murphy Canyon Road, Suite B205 • San Diego, CA 92123-4425 858.292.8030 • Fax 858.292.0771 w www.leightongeo.com 971009-014 our professional opinion that the subject lots are suitable for the intended residential use provided the recommendations included in the project geotechnical reports are incorporated into the design and construction of the residential structures and associated improvements. If you have any questions regarding our recommendations, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC. JA Kvy--- Randall K. Wagner, CEG 1612 Senior Associate Distribution: (2) Addressee (2) Lennar Communities Attention: Mr. Noah Lashbrook -2- 4 Leighton c-j-oo-oc Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY April 28, 2004 Project No. 4971009-014 To: Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Ms. Kristine Zortman Subject: Lrls and Fine-Grading Operations, Lots lanmn Area PA-8. Bri Ranch: In accordance with the request and authorization of representatives of Lennar Communities, we have performed geotechnical observation and testing services during the rough and fine grading operations for Lots 166 through 207 and Lots 225 through 260 of Planning Area PA-8 of the Bressi Ranch project (Carlsbad Tract No. 00-06), located in Carlsbad, California. As of the date of this letter, the rough 'and fine grading operations are essentially complete for Lots 166 through 207 and Lots 225 through 260. However, the remaining lots in Planning Area PA-8 (i.e. Lots 208 through 224) are low and will be utilized as a spoil site for trench footing excavations. The geotechnical conditions encountered during rough and fine grading operations were generally as anticipated. The rough and fine grading operations included: 1) cuts and fills to achieve the design grades; 2) the overexcavation of cut/fill transitions and cut lots containing highly expansive formational material and/or cemented zones; 3) removal of potentially compressible surficial materials' (including undocumented fill, topsoil, c011uvium, alluvium, and weathered formational material) to competent formational material, and 4) construction of canyon subdrains. The placement and compaction of the fill soils were geotëchnically observed and documented. Field density testing indicated that the fill soils were, placed and compacted to at least 90 percent relative compaction (based on ASTM Test Method Dl 557) and near-optimum moisture content in accordance with the recommendations of Leighton and Associates and the requirements of the City of Carlsbad. To mitigate post-construction settlement, deep fills (i.e. areas where the fill soils are generally deeper than approximately 40 feet below the finish grade elevations of the site) were placed at a minimum 95 percent relative compaction. 3934 Murphy Canyon Road, Suite B205 m San Diego, CA 92123-4425 858.292.8030 w Fax 858.292.0771 u wwwieightongeo.com 971009-014 The rough and fine grading operations for Lots 166 through 207 and Lots 225 through 260 of Planning Area PA-8 of the Bressi Ranch project were performed in general accordance with the project geotechnical reports, geotechnical recommendations made during grading, and the City of Carlsbad requirements. It is our professional opinion that the subject lots are suitable for the intended residential use provided the recommendations included in the project geotechnical reports are incorporated into the design and construction of the residential structures and associated improvements. If you have any questions regarding our recommendations, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC Randall K. Wagner, CEG 1612 Senior Associate Distribution: (2) Addressee (2) Lennar Communities Attention: Mr. Noah Lashbrook -2- 4 Leighton C' Leighton and Associates, Inc. A LEIGHTON GROUP COMPANY April 28, 2004 Project No. 4971009-014 To: Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Attention: Ms. Kristine Zortman Subject: Geotechnical Completion Letter of the Rough and Fine-Grading Operations, Lots In accordance with the request and authorization of representatives of Lennar Communities, we have performed geotechnical observation and testing services during the rough and fine grading operations for Lots 65 through 159 of Planning, Area PA-7 of the Bressi Ranch project (Carlsbad Tract No. 00-06), located in Carlsbad, California. As of the date of this letter, the rough and fine grading operations are essentially complete for Lots 65 through 159. The geotechnical conditions encountered during rough and fine grading operations were generally as anticipated. The rough and fine grading operations included: 1) cuts and fills to achieve the' design grades; 2) the overexcavation of cut/fill transitions and cut lots containing highly expansive formational material and/or cemented zones; 3) removal of potentially compressible surficial materials (including undocumented fill, topsoil, colluvium, alluvium, and weathered formational material) to competent formational material; and 4) construction of canyon subdrains. The placement and compaction of the fill soils were geotechnically observed and documented. Field density testing indicated that the fill soils were placed and compacted to at least 90 percent relative compaction (based on ASTM Test Method D1557) and near-optimum moisture content in accordance with the recommendations of Leighton and Associates and the requirements of the City of Carlsbad. The rough and fine grading operations for Lots 65 through 159 of Planning Area PA-7 of the Bressi Ranch project were performed in general accordance with the project geotechnical reports, geotechnical recommendations made during grading, and the City of Carlsbad requirements. It is our professional opinion that the subject lots are suitable for the intended residential use provided 3934 Murphy Canyon Road, Suite B205 m San Diego, CA 92123-4425 858.292.8030 n Fax 858.292.0771 a www.leightongeo.com 971009-014 the recommendations included in the project geotechnical reports are incorporated into the design and construction of the residential structures and associated improvements. If you have any questions regarding our recommendations, please contact this office. We appreciate this opportunity to be of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC. a ov ~~ Randall K. Wagner, GG 1612 Senior Associate Distribution: (2) Addressee (2) Lennar Communities Attention: Mr. Noah Lashbrook -2- $ Leighton L 1• L'i 1 N ... •. - 6. N April 28, 2004 Project No. 4971009-014 To Attention Subject Lennar Communities 1525 Faraday Avenue, Suite 300 Carlsbad, California 92008 Ms. Kristine Zortman Geotechnical Completion Letter of the Rou - 1 Throu2h6LPlann1n Area PA-6. Bressii Fine-GradingOperationot In accordance with the request and authorization of representatives of Lennar Communities, we have performed geotechnical observation and testing services during the rough and fine grading operations for Lots I through 63 of Planning Area PA-6 of the Bressi Ranch project (Carlsbad Tract No. 00-06), located in Carlsbad, California. As of the date of this letter, the rough and fine grading operations are essentially complete for Lot 1 through 63. The geotechnical conditions encountered during rough and fine grading operations were generally as anticipated. The rough and fine grading operations included: I) cuts and fills to achieve the design grades; 2) the overexcavation of cut/fill transitions and cut lots containing highly expansive formational material and/or cemented zones; 3) removal of potentially compressible surficial materials (including undocumented fill, topsoil, colluvium, alluvium, landslide deposits, and weathered formational material) to competent formational material; 4) construction of canyon subdrains; and 5) the construction of buttresses and/or stability fills of slopes or hillsides containing landslides or other adverse geologic conditions. The placement and compaction of the fill soils were geotechnically observed and documented. Field density testing indicated that the fill soils were placed and compacted to at least 90 percent relative compaction (based on ASTM Test Method D1557) and near-optimum moisture content in accordance with the recommendations of Leighton and Associates and the requirements of the City of Carlsbad. To mitigate post-construction settlement, deep fills (i.e. areas where the fill soils are generally deeper than approximately 40 feet below the finish grade elevations of the site) were placed at a minimum 95 percent relative compaction. 3934 Murphy Canyon Road, Suite B205 • San Diego, CA 92123-4425 858.292.8030 • Fax 858.292.0771 • www.leightongeo.com 971009-014 The rough and fine grading operations for Lots 1 through 63 of Planning Area PA-6 of the Bressi Ranch project were performed in general accordance with the project geotechnical reports, geotechnical recommendations made during grading, and the City of Carlsbad requirements. It is our professional opinion that the subject lots are suitable for the intended residential use provided the recommendations included in the project geotech-nical reports are incorporated into the design and construction of the residential structures and associated improvements. If you have any questions regarding our recommendations, please contact this office. We appreciate this opportunity to he of service. Respectfully submitted, LEIGHTON AND ASSOCIATES, INC. 10 Koay----- 1~ Randall K. Wagner, CEG 1612 Senior Associate Distribution: (2) Addressee (2) Lennar Communities Attention: Mr. Noah Lashbrook 21 -2- L.g ht. on