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Home My WebLink AboutCT 99-14; The Regency; Tentative Map (CT) (16)FROM : BRETT DEVELOPMENT " 03-93 FRI 0* FfiX NO. : 402 894 5304 HOMES MKTG Sep. 17 1999 02:52PM PI BENTON ENGINEERING. INC. APPLlfiO SOIL MECHANICS — *T«1 CC CAJON •AN 0>C«0. October 19, 1972 Lg Coira Land Company Costa Del Mar Road Roncho Lo Costa, California 92008 Subject:Project No. 71-7-17D Grading Perm^ No. L-5930 Final Report on Compacted Filled Ground And Classification of Sot! Condi Horn Lots 41 a fo 584, inclusive And Certain Street Areas la Cofta Meadow* Unlr No. 3 Comoad, California Gentlemen: This i» to report the results of tests and observation* made in ordsr to inspect the compaction of filled ground placed on certain areas of Lo Costa Meadow* Unit No. 3 in Carlsbad, California, formerly a port of the County of Son Diego. The fill* were placed during the period between July 15, 1971 and July 20, 1972, The approximate areas and depths of filled ground placed under our inspection in accordance with the approved specifications ore shown on the attached Drawing No. 1, entitled "Location of Compacted Filled Ground." The grading plan used for tha placement of Riled ground was prepared by Rick Engineering Company and approved March 15, 1971. The approximate locations at which th« fresh were taken and »h« finol test results are presented on pages T»l to T-26, inclusive, under the "Table of Test Results." The laboratory determina- tions of the maximum dry densities and optimum moisture contents of the major fill materials are presented on paces T-27 and T-28, under the "Laboratory Test Results." Some of the maximum dry densities shown In the "Table of Te»t Results" were combinations of these. The testt were taken during the weekly periods Indicated below: Test Number 4, inclusive 21, inclusive Inclusive35, 1 to 5 to 22 to 36 to 63, Inclusive 64 fo 113, inclusive m to 153, Inclusive 154 to 218, Inclusive 219 to 275, Inclusive Week Ending July 17, 1971 July 24, 1971 August 7, 1971 Augu*r 14, 1971 Av»us*21, 1971 August 28, 1971 September 4, 197! 1971 . 1971 51010 1A O FROM : BRETT DEVELOPMENT FflX NO. JJ 402 894 5384 HOMES Sep. 17 1999 02:53PM 3 rss P2 Project No. 71-7-17D Lo Costa Land Company Test Number OetoUr J9, 1972 Week Ending 361 to 404, 405 to 456, 457 to 507, 508 to 538, 539 to 570, 571 to 621, 622 to 675, 676 to 701, 702 to 771, 772 to 835, 836 to 905, 906 to 924, 925 to 930, 931 to 935, inclusive inclusive inclusive inclusive inclusive Inclusive Inclusive inclusive inclusive inclusive Inclusive inclusive inclusive Inclusive Octob«r2, 1971 October 9, 1971 October 16, 1971 October 30, 1971 November 6, 1971 November 13r 1971 November 20, 1971 November 27, 1971 December 4, 1971 December 11, 1971 December 18, 1971 December 25, 1971 July 15, 1972 July 22, 1972 The final results of tests and observations Indicate that it>« compacted filled ground ha» b««m placed at 90 percent of the maximum dry density or greater. It Has been determined that the fit! materials, compacted to 90 percent of the maximum dry density, have o safe bearing value of 1930 pounds per square foot for one foot wide continuous footings founded at a minimum depth and placed five feet or more Inside the top of compacted filled ground slope*. If footings ore placed closer to the exposed slopes than 5 feet inside the top of compacted filled ground slopes, these should be deepened one foot below a 1 1/2 horizontal to 1 vertical line projected outward and downward from o point 5 feet horizontally Inside the top of compacted filled ground slopes. Tests indicate that the compacted filled ground Is adequate to satisfactorily support the proposed wood frame dwellings without detrimental settlements. Expansive clay, silty clay, and sandy clay soili were placed In the upper three feet in Certain compacted fill oreas and qlso exist In rhe upper three feet below finished grade In certain cut area*. The final classifications of »he soil conditions existing on each lot ore presented o$ Follow*: Type A-Critically Expansive Soils Lob 13 to 430, 432 to 435, 437 to 441, 446 to 450, 452 to 454, 459 to 466, 470 to 487, 489 to 510, 512 to 527, inclusive inclusive inclusive inclusive inclusive inclusive Inclusive Inclusive / McluiJve Lots 531 to 534, 536 to 540, 543 »o 552,- 554, 556^ 563, 564, 575, 576 578 to 581, 584 Inclusive inclusive ielu*!v« 1558 '0, 574 inclusive FROtf : BRETT DEVELOPMENT •r" 08-99 FRI e«, Pro|ect No. 71-7-17D " Lo Co»to Lond Company Lots 431 and 436 442 to FOX NO. : 402 394 5304 JJ F>l_ANETxMEW HOMES MKTG -3- Type B >• Marginally Expansive Sol Is Sep. 17 1999 02:54PM P3 3 TSS 4653 P.0-9 October 19, 1972 467 to 488, 511 Lob 528, 529, 530, 535 542, 555, 560, 565 566, 568, 569, 571 572 and 573 Type C - Nonexponslve Soils Lot* 541, 553, 559, 561, 562 567, 577, 582, and 583 It is recommended that the following special design and precautions be taken for the houses to be constructed on the above lot* in order to minimize the possible damaging effects due to differential movements of the potentially expensive sollst 1 . 2. Tyjpe A Lots Avoid the use of isolated Interior piers T Use continuous interconnected reinforced footings throughout, and place these at o minimum depth of two feet below the lowest adjacent exterior final ground surface, Reinforce and Interconnect continuous!)' with steel bars all interior and exterior footings with one #5 bar at 3 inches above the bottom of the footings and one *5 bor placed 1 1/2 inches below »he top of the stems' of the footings, Exercise every effort to om/re that the moisture content of the soils in the upper 18 inches below finished grade is 1 percent to 3 percent greater than optimgm of the time of placing foundations and 5. Raised wooden floors that spon betw«wm continuous footings ar« bosf, or concrete slabs with ot lea»t 6x6 -10/10 welded wire reinforcement and a mfnlmum of 4 inches of crushed rod* 3/4 to 1 inch In size beneath oil concrete slabs. A moisture barrier should be provided over the crushed rook and this should be covered with 2 fach** of sand below concrete stabs. Separate garage slcdbt from perimeter footings by o 1/2 inch thickness of construction felt or equivalent, to allow independent movement of garage slabs relative to perimeter footings. Assure complete separation by extending hSe Felt over the full depth of the front thickened edae of the garage slab. Also, cut off the garage door stops at leos* 1/2 inch above the- slab. FROM : BRETT DEUELOPMENT • ' •*!• 4 FflX NO. : 402 894 5304 JJ PUONGTXNEU HOMES Sep. 17 1999 02:54PM P4 P> 755 4«-»55 P. 10 Project No. 71-7-17D • to C«t« Lond Company October 19, 1972 Provide positive drainage owoy from all perimeter footings with e Vertical foil of a* lft«t 6 fnehec {IT « horizontal distance of 5 to 6 feet outside* fh« howe woHi. Those lots listed as Type 8 lots should follow alt rhe> above-listed recommendations with the two following exceptions: 1. The continuous footings; may b» placed oh <r minimum depth of J8 inches b*tow rhe lowest adjacent exterior final ground surface rather then the two feet recommended for Type A tots. 2. Single '4 bar placed as directed (above) near fops and bottonw of oil Interior and exterior footings may be substituted for the *5 bars recommended for Type A lots, Recommendations 3 to 6, inclusive, as listed for th« Type A lots, are obo applicable to the Type B lots. Only none^pomlve soil conditions were observed in the upper three feet on the Type C and therefore specially designed footings and slabs will not be required on these lots. Respectfully submitted, BENTON ENGINEERING, INC. By R, C. Remer Reviewed by Philip H. Benfon, Civil Engineer Dis»r;(4) (1) (I) (2) (2) (2) Raneho La Costa, Inc. Attention: Mr. Burton L. Kramer Rick Engineering Company San Diego County Building inspection, Vista Office Deportment of County Engineer (?) Attention* Mr. H. M. Taylor (1) Arrant/on; Mr. Joe. Sovello