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Home My WebLink AboutCT 74-19; Laguna Riviera Estates; Soils Report Addendum; 1966-01-061 -~~~ .~ -- ~,. T:; ‘~. ‘:--, ,I, ,. .,_, , .,~ .~ :’ ~~~ __~~~~~~ ~~~..~ ._ -&i ,-,.&L-*+1** -.i . c-i 74-19 DkESSELHAUS ENGINEERS CONSULTlNG C/V/L ENGINEERS 528 SOUTH HILL STREET + OCEAN81DE. CALIFORNIA + PHONE 722.2126 DONALD F. “RESSEL”A”S. CUE L BRIAN IllTH~ C.E January 6, 1966 - Kamar Construction Co., Inc. P. 0. Box 71 Carlsbad, California - - - - - .- No. 720, Carlsbad, California -ET Subject: Addendum to Foundation Soils Investigation Gentlemen: This report is an addendum to our Foundation Soils Investigatmn Repcrt for Rancho Agua Hedionda Subdivision dated July 29, 1965. The following modifications shall become a part of the report: Item 1. Item 2. Item 3. The physical indices of the soils enwntered at the site are reported on Enclosure No. 1. EARTHWORK: Sec. VIB, page 4; The first paragraph shall be changed tc read: The mantle of Black or dark brown clay on the Northerly portion of the site is expansive. All expansive soils shall be removed from the entire lot site on all building lots exclusive of rear slopes and side slopes. The expansive clay may be wasted in the proposed golf course area along the Easterly pr0prrt.y line. No unsatisfactory material is to be placed on any lot area. EARTHWORK: Sec. VlB, page 5; The third paragraph shall be changed to read: -- If unstable cioarse sands and gravels are encountered, they shall be mixed with fine sand and clay. ‘The gradation of the resulting mixture shall be within the following limits: Sieve Number or Size in inches Passing a 6” Sieve II II 4” ,t II “2” ,I (I ‘( 314 ” sieve !I !/ -j/r!,< I, I! 1, #A 1, Percent by Weight 95-100 80-,100 so-x5 35-65 25-50 DRESSELHAUS ENGINEERS - iicii-6. Number 0, ,5 I z e iI.1 inch e s .-I_ Percent bv Weight Pa 5 sing 2 !i IO sieve 15-35 ,I " ir 40 5iex.r 5-15 - /, " # 100 sieve 2-10 II /I $200 sirve O-8. ,- - - Y\u ~t:~~clcs of krrcx:cr dimension than sj~x inches (6”) shall be placed in the <iii in;i!l:ri.~l on anv lot. Rocks of greater dimensions than six inches fc,“) rr~,.l:; hr v.xstt.d in the prsposed golf course are;r along the Easterly “T-‘c’pc‘ c-t\ line . Rocks wxsted in the self course area shall be mixed with !.i,ic ,cr;Linpr! till ioils. SJ rocks six111 be allowed to nest and all voids mTlst bc c.lrr.fuIly filled v;i:h soils and properly compacted. - - - - - - - Item 4. EARTI~!M’ORK: Sec. IVB, page 5 ‘The foll~ou-ing shall be inc!uded in the specifications for non- cxpansjvc soil used in the controlled fills: The maxim~~rn rxpansion ot non-expansi\re soil used in the controlled fill :-l..J! no! exceed 0. 59L. The limiting expansion test shall be run fror:, ;,! :~ir-dry condition !o a saturated condition at 1. 0 psi. The soils 1or !?:c> c~pa1~slo;: Ies!~s shrill be rrcompacted to maximum dcnsit)- ;it optim,,I,> tn5i51~11.~. <-o::ter!t, in accordance with the A+S. ‘1. h,l. D155.;‘-‘b F tc’+i mr.ihL>d. Item i. EARTH1%~ORK: SC<:. :VR, pagt’ 5 - A tirr-i;ollsoli:l;it~o!~ study 01 tll~‘ compressible soil5 f ,und on the >~GLtT !,.,s: brrer. n!.llcY. Tl:t rrsuits of the sludy are presented on x,;,:li:sl; “F se. 2. Front 1.1:~ t.irlle-co~,‘ol~jd;~t ii.!. >tudy ;md accepted analytical procedures its is <vs!imn:ed 90% :~f t!lP p-!rr,.;cy coxsolidatiori will be reached in 30 rla)-s. Scttln-nent pl;rter slh~.;ld br instal~lcd on the fill soils overI>-ing the compr~~ss~‘bl~~ ..?jl:, irr~~nl(~,di;rt~~lii .LflPi- the fill hlzs been i,roll~ht. ?:o ,<rxrir. (jll,~,~,r.:.?ri;:::-: C-C :lic icftl~~rn,~r:: plat,es sh~:ild he mad? <it !rrq!.wiI! i:!l,<,r\ ,115 !iJ v,s!,i!,l’s!i ,< :et:lt~r~!it~nt i‘ii~\-e ilnd d~trrmi~:c ..vhen (,JC”;, 31. ri:r p ~~:x,n: i‘c~: <<;~I :<I.,,! ib:: ii rra<.!,ed. l:\uildi:,:~: COT!- s,,‘,:i.:i.,:~ XII,,]! ;,” >?i:, : _>’ ,I: !?<S.” .xi;c rt’ corr:prrssil,lr soil D e.yi.st ,~>:::il ‘~i(!i’ I,: :. (I ;‘--,!,!I”~ ,‘/~I vi:mi <,,.-:;ir: /i&5 :;rrii r‘.;tc,i!rd. 1:cn i . k;*,(‘I‘!i X,,’ :r:>;: ?a fo::.r!,i: in., .s.;,ll “c.si: :3n r: 1’ ,>,>d fill surfaces. The native soil on !L,:,L v,l ‘/C ~,.:,~,~;lrl ,‘<I:!‘ .,,:7 C.J! ,~(~,Cj l’iii .“:..i‘,l(.<iq. ~‘~,a11 lh= .,-rmoi-rd a!~ d .-,‘p, ,“t.l! ,:,y .,r;~,:,;!<~.!,,.d i:3, :>,;, ‘.~‘,,;$I ..l~., :! ,,: ‘:.,-VC. :> ;rf ieaR1 one -- - -- - - DRESSELHAUS ENGINEERS Item 7. foot of fill between the proposed building foundations and the native soil in the cut area. If the above recommendation is not followed, the proposed building foundations shall extend through the fill into compacted native soils. SPECIFICATIONS: The attached “Specifications for Construction of Controlled Fills” shall become a part of the Foundation Investigation Report. Respectfully submitted, DRESSELHAUS ENGINEERS, E. Brian Smith, RCE 13, 817 EBS:ct cc: FHA (2) Enclosu-es - - - Enclosure No. I _~~~~ Red-brown Grey-brown Black Grey fine Brown med to coarse fine to med Expansive to med Silty -YPE, Sand Sand Clay Sand Topsoil -.aximum Density, pcf. 122.6 117.7 120. 1 111.0 127.2 ;ptimum Moisture, % 11.6 12.0 12.0 9. 8 8. 0 Angle of Internal Friction 26’ 29’ 2 1’ 30. 5’ 27’ -ohesion, psf. 50 260 300 135 420 ,_ lasticity Index 16. 3 Liquid Limit 34.5 xpansion, % 3.2 SIEVE ANALYSIS Percent Passing Sieve Size Shown i i.t 100.0 93.7 100.0 96.6 100.0 85. 3 100.0 99.2 100.0 96.4 14 69.4 89. 5 67. 9 93. 8 82.4 ,I 20 53.2 84. 3 60. 1 87. 2 72. 7 3 48 44.2 46.0 31.0 31. 3 39.4 100 2. 5 20. 8 17.9 13. 5 25.4 ,200 1. 0 5.4 8.5 3. 9 14.7 -:YPE Rrown silty Lt. brown fine Red-brown Fine ’ Wite fine to expansive fine to med beach med silica Ciay silty S&l Sand Sand Sand J4aximum Density, pcf. -. 125ilI ’ I 14. a 119. 1 117.3 120.0 -)ptimm Moisture, % .Ingle of Internal Friction Cohesion, psf. -, Aquid Limit ,‘lasticity Index Expansion, % - SIEVE ANALYSIS . . -iJ 4 I 8 I-# 14 ff 20 # 48 -#loo #ZOO 9. 7 IO. 7 12.2 11. 5 10.4 38. $ 28’ 23’ 34’ 30’ 700 80 15 0 300 33.0 12.4 2.4 r Percent Size Shown Passing Sieves 100.0 100.0 100.0 100.0 100. 0 93.2 99.2 97.7 98.7 95.0 82. 8 95. 6 91.2 96.8 77.3 76.0 91.4 85.6 95. a 63. 7 34.2 50.2 3 1. 3 40.0 24. 4 18.6 21.9 10.7 14.7 14. 5 9.3 5. a 3.7 5.5 7. 8 $A+,. ~‘2 ,:‘, i_..~ _., ~,:~ I<<CC.; & ‘jbi”<.rcn .~.^ .,.. - Specifications for Construction of Controlled Fills _^ - _.~ - - - - - - -_ - - - CONSTRUCTION OF CONTROLLED FILLS GENERAL DESCRIPTION: This item shall consist of all clearing and grubbing, removal of existing structures and foundations, preparation of land to be filled, filling of the land, spreading, compaction and control of the fill, and all other subsidiary work necessary to complete the grading of the filled areas to con- form with the lines, grades and slopes as shown on the accepted plans. CLEARING, GRUBBING AND PREPARING AREAS TO BE FILLED. (a) All timber, logs, tiees, brush and other rubbish shall be removed, piled -and burned or otherwise disposed of so as to leave the areas that have been disturbed with a neat and finished appearance free from unsightly debris, (b) All vegetable matter shall he removed from the surface upon which the fill is to be placed, and the surface shall then be scarified to a depth of at least six inches (6”) and until the surface is free from ruts, hummocks or other uneven features which would tend to prevent uniform compaction by the equipment to be used. (c) Fills over three feet (3’) high shall have steps cut in the original ground at two foot vertical intervals on the slope, The steps shall be eighteen inches (18”) wide, more or less, and may be constructed by dozing or blading. The general direction of the bench shall run parallel with the contours and the maximum slope shall be three horizontal units to one vertical unit. (d) After the foundation for the fill hu been cleared or scarified, it shall be disccd or bladed until it is uniform and free from large clods brought to the proper moisture content and compacted to not less than 90% of maximum density in accordance with A.S.T.M. D1557-58T. No fill shall be placed until the soils engineer has git~en written clearance that the foundation is acceptable for receiving fill. MATERIALS: Material for the fill shall’be free from vegetable matter and other deleterious substances, and shall not contain rocks or lumps of greater dimensions than six inches (6”). No pockets of rocks shall be allowed, PLACING, SPREADIN’C A ND COMPACTING FILL MATERIAL. (a) The selected fill materiJ sh:ll be placed in layers which, when compac6ad, shall not exceed six inches (6”). Each layer shall be spread evenly and shall be thoroughly blade mixed during the spreading to insure uniformity of material in each layer. Form X78 -l- - - - - - -- -. - - (b) When the moisture content of the fill materials is low water shall be added to bring the fill within the specified density range. (c) When the moisture content of the material is above that specified by the density range. the fill material shall be serated by blading or other satisfactory methods until the moisture content is within the density range, (d) After each layer has been placed,, mixed and spread evenly, it shall be ; thoroughly compacted to not less than the specified maximum density in accor-, ; dance with A. S. T, M. D1557-5gT. Compaction shall be by means of tamping or sheepsfoot rollers, multiple-wheel pneumatic-tired rollers or other types of rollers. Rollers shall be of such design that they will.be able to compact the fill to the specified moisture content. Rolling of each layer shall be contin- . uous over its entire area.bnd the roller shall make sufficient trips to insure that the desired density has been obtained. (e) Fill shall be compacted one foot beyond the finish grade line and cut back to grade line by removing fluff and undercompac ted fill. (f) Field density tests shall be made by the soils engineer at intervals not exceeding two feet of fill height providea all layers are tested. Where sheep8 - foot rollers are used, the soil may be disturbed to a depth of several inches. Density readings shal1 be taken in the compacted material below the.dieturbed surface. When these readings indicate that the density of any layer of fill or portion thereof is below the required densityi that par titular layer or portion shall be reworked until the required density has been obtained (g) The fill operation shall be continued in six inch (6”) compacted layers, as specified aboW. vntfl the IfIl ti8’&Oen brought to the finished slopes and grades as shown on the accepted plans~ SUPERVISION: Supervision by the soils engineer shall be made during the fill and contracting operations so that he can certify that the fill was made in accor- dance with accepted specifications. SEASONAL LIMITS. No fill material shail be placed, spread or rolled while it ’ is frozen or thawing or during unfavorable weather conditions When the work’ is interrupted by heavy rain, fill operations shall not be resumed until field tests by the soils engineer indicate that the moisture content and density of the fill are as previously speci&ed. In the event that, in the opinion of the engineer, the soils c- unsatisfactory for grading.purposes are encountered,. they shall no-t be ~incorporated . in the grading and disposition will be made at the engineer’s discretions Form I70 -2- - L- VP- - -. -~ FILL AND CUT SLOPES Fill slopes shall not m&sod 8 slope ratio of two (2) horizoatal to one (1) vertlr:ei. Cut slopes ehall not exceed a elope ratio of one and one-half (1 l/Z) horinontal to one 0) vertical. EARTHWORK AU r~emeadationrt contained in tho body of the eotln report ehsPI be couaidrr- ed a part of these specifications. - - - - - I ,‘v’;l’ ..i I July 29, 1965 ~Federal Housing Administration 1415 Sixth Street S8n IXego. California Re: Job No. Z-L;359 Rancho Agua He Carlabad, Califoru Subject: Certifkation of Specified Fills in Accordance with Sectf\oh/ B-S of F. H. A.. II&a Sheet 79-B Gontlsmen: In referonce to the rubject, the results of our soil1 lnveetigation and laboratory tests, as outlined in our report dated July 29.1965. indicate the follow~in#: 1. Dctrlrr~e~al settlerrent or hewing will not occur if the recozrmen- dationa and specilications for the construction controlled fill are foliowed 2. ‘Ihc natural foundation soils are adaquate to safely support the fill material and/or the proposed residential structures if the recommen- dationm contained in the soils inrostig8tion report are followed. 3. The recommended bearing premrure for squrro or continuous footings is 1500 pounds per square foot. All footings for one story rtruc*;es should be embedded at le8st twelve (12) inches below fi&sh grade, AIL footings for two story structures should be embedded at lease eighteen (18) inches below fiuish grade. 4. .4 maxin.tim slope ratio of one and one half horirontally to one vsrti- tally for cut elopes. and two horlrontally to one vertically for fill alopes should net te exceeded, ,, :’ ,’ ,’ ,:’ jyy -pi ,-~-!,---:‘.i~~.;~~;~’ T yj;-gTT-- y?s;,j:;, c,: ! r:arr.k3? c.o:nntr?;ctiou cwpoay - - - - - - - - -