HomeMy WebLinkAboutCT 79-05; LA COSTA GREENS; SUPPLEMENTAL RECOMMENDATIONS TO OUR LIMITED SOILS INVESTIGATION PROPOSED ALTA VERDE CONDOMINIUMS LOTS 6 AND 7; 1979-10-11·.
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BENTON ENGINEERING, INC.
APPLIED SOIL MECHANICS -l"OUNDA.TION8
111"·0 RU FPIN ROAD
SAN DIEC.O, CALIFORNIA 1212:11
· October 11, 1979
PHILIP HENKINQ BENTON
P'"lt810SltT • CIVIL. &NlilNl:1:11
Frederlck J. Meyer, A. I .A.
Architect & Associates
2348 Harcourt Drive
San Diego, ~allfornla 92123
Attenttonz
Sub{ectz
Gentlemen,
Mr. Frederl ck M.e ye r
Pro}ect No. 79-8-23A
Supplemental Recommendations to
our Ltmlted Soils Investigation, Proposed
Alta Verde Condominiums, Lots 6 and 7
of Lo Costa Greens Subdivision, North of
La Costa Avenue, °Carlsbad, ColJfornta
dated October 2, 1_979
TSL.SP'HON& (714) HS-19811
This ts to supplement the subJect report with re.gard to the drainage recommendatl~na lncludaci
on page 7 of our report dated October 2, 1979 that would apply for expcmslva so!I condltlona
exbtfng u~dernoath the concrete slabs In the butldlng units. ·
This recommended drainage away from al I perimeter footings may be reduced to the 2 1/2
feot distances shown on your "Grading Plan for Alta Verde Condc,minlurm, Lots 6 and 7 of
l.,.a Cosi'o Greens, ,Ylap 6708, Sheet 2 of 2 Sheets", provided 3 feet of non~xpamJve solls
are placed an.d compacted .durfng grodlng immadlately benec;th the cd{acent concrete slabs
of the buildings .. Thls· wtll probably require spe~lal handlrng of select non-eY.pan,tw, fflQterlals
01.U"ing rM grading for th?s development.
Jt ls unknown at this time whether enough non-expansive sol!:. exist on th6 stl'e 10 provltja
fur this 3 foot thickness of non-expansive flli ground beneath the buJldJng pad concrete ilabs.
1f tnsufflclent quantities exist to be used In the upper 3 feet of grade, then select non-expansive
solls meeting the followlng criteria will have to be Imported to the site and placed ond
· ~pgct,d In the upper 3 feet below thia pad grade. The Import should meet °the ~!IPWfng crlterlc:u
(o) These shall be a silty sand, :slightly eiciyey ~and, or send soli type.
(b) These shall have no more than 40 percent passing the No. 200 sieve sl:te.
Abo, ct least 50 percent shall pass ti,., No. 4 sieve size and It shall contaln no
gravel larger than 3 Inches. . .
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Frederick J. Meyer, A. I .A.
Protect No. 79'.'"8-23A.
. ~2-October 11, 1979
(c) The expansion of a one Inch htgh sample of the minus 10 mal'erlal remolded to
92 percent of maximum dry dens tty Qnd then air dried for two days at 105° F 1
then loaded to 500 pounds per square foot and saturated, shall not exceed 2.5
percent.
Respectfully submitted, .
BENTON ENGINEERING, INC.
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By~nt~~
RCE No. 10332
PHB/Jr
Dtstrlbutloni (2) Addressee
(2) City of Carlsbad
1200 Elm Avenue
Carlsbad, Cclffornla 92908
Attention: Nir. Bryan Mell !ch
•INTQN l'iNQINIIUUNO, INC,