HomeMy WebLinkAboutSDP 11-04; LA COSTA BLUFFS LOT 406; FINAL SOILS REPORT; 2021-11-12.,
EAST COUNTY SOLL CONSULTATION
AND ENGINEERING, INC
Diversified Development
10925 HARTLEY ROAD, SUITE "l"
SANTEE, CALIFORNIA 92071
TEL. 619-258-7901
7668 El Camino Real, I 04-280
Carlsbad, California 92009
November 12 , 2021~-
Project No. 0l-l l47H 1(1)
Subject: Final As-Graded Soil Report for La Costa Bluffs Apartments
2930, 2936, 2940 & 2946 La Costa A venue
City of Carlsbad, California 92009
References: See Attached
Ladies & Gentlemen:
In accordance with your request, we have prepared this final, as-graded soil report for the La
Costa Bluffs Apartment project at the subject site.
Based on our field observations and referenced Reports of Field Density Tests (References 1-4,
6, 7, 9, l 0, 12 and 13), it is our opinion that the soil engineering and engineering geologic
aspects of the site grading were performed in accordance with the referenced limited
geotechnical investigation and updates (References 17, 19 and 23), local grading ordinances and
the project grading plans. In addition, footing excavations, soil expansion characteristics and soil
bearing capacity are all in conformance with the approved plans and specifications.
This opportunity to be of service is appreciated. If you have any questions, or we can be of
further service, please do not hesitate to call or contact us.
Respectfully Submitted,
Martin R. Owen, PE, GE
Geotechnical Engineer
Attachment: References
Final As-Graded Soil Report for La Costa Bluffs Apartments
2930, 2936, 2940 & 2946 La Costa A venue
Carlsbad, California 92009
REFERENCES
Page 2
November 12, 2021
Project No. 01-1147111(1)
I. "Report of Field Density Tests, Additional Retaining Walls, La Costa Bluffs Apartments, Lots 406 and 407,
2930 La Costa Avenue, City of Carlsbad, Ca lifornia 92008", Project No. 01-1 14 7G I (I), Prepared by East
County So il Consullation and Engin eering, Inc., Dated October 2, 20 13.
2. "Report of Field Density Tests, Water Linc Trench Backfill, La Costa Bluffs Apartrnents 2930 La Costa
Avenue, City of Carlsbad, California 92008", Project No. 0l-1147Gl(l), Prepared by East County Soil
Co nsultati on an d Engineering, lnc., Dated June J I, 20 13.
3. "Report of Field Density Tests, Sewer Trench Backfill, La Costa Bluffs Apartments, 2930 La Costa Avenue,
City of Carlsbad, Ca lifornia 92008", Project No. 01-114 7G I (I), Prepared by East County Soil Consultation and
Engineering, lDc., Dated April 4, 20 13.
4. "Report of Field Density Tests, La Costa Bluffs Apartments, Lot 409, SDP 11 -07, 2930 La Costa Avenue, City
of Carl sbad, California 92008", Project No. 0 l -I 147G 1( I), Prepared by East County Soil Co nsultation and
Engineering, In c., Dated January 30, 2012.
5. "Foundation Excavation Observation, La Costa Bluffs Apartments, Loi 409, SDP 11 -07, 2930 La Costa
AveDue, City of Carlsbad , Ca li fornia 92008'', Proj ect No. 01-l 147G l(l ), Prepared by East County Soil
Consultation and Engineering, Inc., Dated February 14, 201 2.
6. "Report of Field Density Tests, Proposed Retaining Wall, La Costa Bluffs Apartments, Lot 409, SDP 11-07,
2930 La Costa Avenue, City of Carlsbad, California 92008", Project No. 0l-1147Gl(l), Prepared by East
County Soil Consultation and Engineering, Inc ., Dated February 14, 2012.
7. "Report of Field Density Tests, La Costa Bluffs Apartments, Loi 408, SDP 11 -06, 2930 La Costa Avenue, City
of Carlsbad, California 92008", Proj ect No. 01-11470 I (I), Prepared by East County Soil Consultation and
Engineering, Inc., Dated February 8, 20 12.
8. "Foundat ion Excavation Observation, La Costa Blu ffs Apartments, Lot 408, SDP 11 -06, 2930 La Costa
Avenue, City of Carlsbad, California 92008", Project No. 01-11470 I (I), Prepared by Eas t Co unty Soil
Consultation and Engineering, Inc., Dated May 2, 2012.
9. "Report of Field Density Tests, Proposed Retaining Wall, Ln Costa Bluffs Apartments, Lot 408, SDP 11-06,
2930 La Costa Avenue, City of Carlsbad, Ca lifornia 92008'', Project No. 0l-l 147Gl(I), Prepared by East
County So il Consultation and Engineering, Inc., Dated February 14, 201 2.
10. "Report of Field Density Tests , La Costa Bluffs Apartments, Lot 407, SDP 11-05, 2930 La Costa Avenue, City
of Carlsbad, Ca lifornia 92008", Project No. 01-114 7G I (I), Prepared by East County Soil Consultation and
Engineering, Inc. Dated March 20, 2012.
I I. "Foundation Excavation Observation, La Costa Bluffs Apartments, Lot 407, SDP 11-05, 2930 La Costa
Avenue, City or Carlsbad, California 92008'', Projec t No. 01-1 147G I (I), Prepared by East County Soil
Consultation and Engineering, In c., Dated June 19, 20 12.
12. ''Report of Field Density Tests, Proposed Retaining Wall, La Costa Bluffs Apartments, Loi 407, SDP 11-05,
2930 La Costa Avenue. City of Carlsbad, California 92008'', Project No. 0 l -I I 47G I (I), Prepared by East
Co unty Soil Consultation and Engineering, Inc., Dated February 14, 20 12.
13. "Report of Field Density Tests, La Costa Bluffs Apartments, Loi 406, SDP 11-04, 2930 La Costa A venue, City
of Carlsbad, California 92008", Project No. 01-11470 I (I), Prepared by East County Soil Co nsultation and
Engineering, Inc., Dated April 2, 201 2.
EAST COUNTY SOIL CO SULTATION AND ENG INEERING, I C.
Final As-Graded Soil Repol't fol' La Costa Blnffs Apartments
2930, 2936, 2940 & 2946 La Costa Avenue
Cal'lshad, California 92009
REFERENCES
(Continued)
Page 2
Novemhel' 12, 2021
Project No. 0l-1147Hl(I)
14. "Foundation Excavati on Observation, La Costa Bluffs Apartments, Lot 406, SDP I 1-04, 2930 La Costa
Avenue, City of Carlsbad, California 92008'', Project No. 01-114 7G I (I), Prepared by East County Soil
Consultation and Engineering, In c., Dated July 26, 20 12.
15. "Response to City of Carl sbad's Review o f Documents, 4 Proposed 6-Unit Residential Buildings, (La Costa
Bluffs, LLC Apartments), Lots 406 th ro ugh 409, Map No. 6600, La Costa Avenue, City of Carlsbad,
California'', Project No. 01-11470 I (I), Prepared by East County Soil Consultation and Engineering, Inc., Dated
December 6, 20 I I.
16. "Grading Plan, Foundation Plan and Details Review, 4 Proposed 6-Unit Residential Buildings, Lots 406
through 409, Map No. 6600, La Costa Avenue, City of Carlsbad, Cali fornia", Project No. 0 I-I I 47G I (I),
Prepared by East County Soil Consultation and Engineering, Inc., Dated December 6, 2011 .
17. "Limited Site Investigation Update, 4 Proposed 6-Unit Residential Buildings, Lots 406 through 409, Map No.
6600, La Costa Avenue, C ity of Carlsbad, California", Project No. 0 1-11470 I (I), Prepared by East County Soil
Consultation and Engineering, Inc., Dated August 3, 2011 .
18. "Addendum to Limited Site In vestigation Update, Proposed 26-Unit Residential Development, North Side of La
Costa Avenue, West of Romeria Street, City of Carlsbad, California", Project No.01-l 147G I (IE), Prepared by
East County Soil Consultation and Engineering, Inc., Dated November 6, 2007.
19. "Limited Site Investigation Update, Proposed 26-Unit Apartment Complex, North Side of La Costa Avenue
West of Romeria Street, City of Carlsbad, California", Project No. 0 I -I 147G I (ID), Prepared by East County
Soil Consultation and Engineering, Inc., Dated March 5, 2007.
20. "Drainage Swale Clarification, Proposed Apartment Complex, Units No. 4 and 5, North Side of La Costa
Avenue West of Romcria Street, City of Carlsbad, California", Project No. 01-114 7G I (IC), Prepared by East
County Soil Consultation and Engineering, Inc., Dated February 17 , 2004.
2 1. "Drainage Swale Assessment, Proposed 5-Unit Apartment Building, Lot 409, North Side of La Costa Avenu e,
West of Romeria Street, City of Carl sbad, California", Project No. 01-11470 I ( I B), Prepared by East County
Soil Consultation and Engineering, lnc., Dated December 8, 2003.
22 . "Addendum to Limited Site lnvestigation, Slope Stability Analysis and Drainage Swale Location, Proposed 26-
Unit Apartment Complex, 4 Vacant Lots, North Side of LA Costa Avenue, West of Romeria Street, City of
Carlsbad, California", Project No. Ol-l 147G l(IA), Prepared by East County Soil Consultation and
Engineering, Inc., Dated May 20, 2003.
23. "Limited Site In vestigation, Proposed 26-Unit Apartment Complex, North Side of LA Costa Avenue, West of
Romeria Street, City of Carlsbad, California", Project No. 01-11470 I (I), Prepared by East County Soil
Consultation and Engineering, Inc., Dated June 9, 200 I.
EAST COUNTY SOIL CO SULTATION AND ENGIN EERING, LNC.
-1
EAST COUNTY SOIL CONSULTATION
AND ENGINEERlNG, INC.
10925 .HARTLEY ROAD, SUITE "I"
SANTEE, CALIFORNIA 92071
(619) 258-7901
Fax 258-7902
Diversified Development
24335 Prielipp Road, Suite 112
Wildomar, California 92595
Sul~ject: Report of Field Density Tests
La Costa Bluff:-;; Apartments
Lot Nt>. 406, SDP 11-04, 2930 La Costa Avenue
City of Carlsbad, California 92008
Ladies & Gentlemen:
April 2, 2012
Project No. 0l-1147HJ(l)
This is to present the results of field density tests performed on the building pad for the proposed
two-story, apartment building on Lot No. 406 at tJie subject site.
In accordance with your request, in-place field density tests were performed in accordance with
ASTM D1556 (Sand Cone I\,1ethod). Grading was conducted bet\.veen January 26, 2012 and
March 8, 2012 under the observution and testing of a representitive of East County Soil
Consultation & Engineering Inc.
The results of the field density tests are presented on Page T-1 under "Table of Test Results". The
laboratory determinations of the maximum dry densities and optimum moisture contents of the
fill soils as weB as the expansion index test results are set forth on Page Lw l under "Laboratory
Test Results". Direct shear and consoiidation tests results are also attached. The approximate
test locations are shown on Plate No. I.
Following clearing and grubbing. i.e. the removal of vegetation and deleterious materials,
subgrade soils were overexcavated to depths ranging between approximately 10 and 31 feet
below existing grade into the dense sandstone of the Santiago Formation. Prior to the placement
of new fill, the bottom of the excavation was scarified to a depth of approximately 12 inches,
moisture conditioned and compacted.
On-site fill soils consisting of clayey sand were placed in thin lifts, moisture conditioned
generally above optimum and compacted to a minimun1 of 90 percent relative compaction.
Compaction was achieved with the use of a Caterpillar 9500 loader, a Caterpillar 977 trackloader
and a sheepsf:oot roller.
DIVERSIFIED DEVELOPMEN71 LA COSTA BLUPFS PROJECT NO. DI-I J47Hl(/j
Based on our field observations and density test results, it is our oprmon that the grading
operation for the proposed residential project was performed in accordance with the referenced
geotechnica1 report (Reference No. 9) and local grading ordinances.
Furthermore, we have reviewed the referenced reports and evaluated the new soil conditions
following the grading operation on Lot 406. Based upon the "medium" expansion potential of
the surfical fill soils, the deptbs of of fill and the adjacent slope to the north, the foundation and
slab recommendations are updated as follows:
a. Continuous footings are suitable for use and should extend to a minimum depth of 24 inches
below the lowest adjacent grade for the proposed two-story structure into the properly compacted
fill soils. These footings should be at least 15 inches in width and reinforced with four #5 steel
bars; two bars placed near the top of the fbotings and the other t\vo bars placed near the bottom
of the footings. In addition, bearing wall footings that are to be located near the top of the adjacent
slope should be deepened to allow a minimum daylight distance of l 0 feet laterally from the outside
edge of the footing to the slope face.
b. Interior co11crete floor slabs should be a minimum 4 inches thick. Reinforcement should
consist of #3 bars placed at 12 inches on center each way within the middle third of the slabs by
supporting the steel on chairs or concrete blocks "dobies'1• The slabs should be underlain by 2
inches of clean sand over a 10-mil visqueen moisture barrier and ,'l capillary break at least 4
inches thick, consisting of coarse sand, gravel or crushed rock not exceeding 3/4 inch in size with
no more than 5 perceIJt passing the #200 sieve.
c. An allowable soil bearing value of 2,000 pounds per square foot may be used for the design of
the above footings founded into the compacted fiJ] soils. This value may be increased by 700 psf
and 300 psf for each additional foot of depth and width respectively to a maximum of 3,000 psf
due to settlement limitations. The allowable bearing value may be also increaded by one-third
for transient loading, such as wind or seismic load.
d. Lateral resistance to horizontal movement may be provided by the soil passive pressure and
the friction of concrete to soil. An allowable passive pressure of 250 psf/ ft of depth may be
used. A coefficient of friction of 0.35 is recommended. The soils passive pressure may be
increased by 1/3 for wind and seismic loading.
e. Perimeter foundations and interior slabs should be thoroughly saturated for at least 24 hours
prior to placement.
2
DJVERS'IFJED DEVELOPA1ENT/ LA COSTA BLUFFS PROJECT NO. 01-1 l47Hl(l)
If we can be of fmther assistance, please do not hesitate to contac t our office.
Pages T~ 1, L~ I and Plate No. 1 are attached.
Respectfully Submitted,
Mamadou Saliou Diallo, P.E.
RCE 54071, GE 2704
l'v1SD/md
---····························••'-••--· ·······························'-······
TEST SOIL
NO. TYPE
l
2
,., _,
4
5 1
6 2
'7 2 J
8 3
9 3
JO l
ll 3
12 2
]3 3
14 3
15 .,
.)
16 3
17 3
18 3
19 3
20 3
21 3
22 2
23 2
24 2
25
26 3
DJVERSJF!ED DEVELOPMENT! LA COSTA BLUFPS PROJECT NO O i-1 I 47H l (/)
DEPTH
OF :FILL
IN FEET
2
4
6
7
9
11
13
14
15
17
18
19
21
23
24
25
26
l
2
3
5
6 ,.,
!
8
2
3
TABLE O.F TEST RESULTS
ASTMD1556
MAXIMUM
FI.ELD DRY DRY
MOISTURE DENSITY DENSITY
%DRY WT. P.C.F. P.C.F
16.9 109.7 118.5
16,2 107.7 118.5
18.8 107.4 118.5
18.7 1.11.9 118,5
.19.5 111.5 l J 8.5
20.2 106.7 l 16 .5
19.2 106.2 116.5
16,7 109.3 118.0
l 7.1 109. l l 18,0
16.l 110.6 118.5
18,2 105.4 118.0
17.7 106.3 116.5
17.6 ll l.3 1.18.0
17.3 108.7 l 18.0
] 8.3 J 06.S l l 8.0
16.7 11 J.l l 18.0
l 7.1 U0.5 118.0
18.7 106.0 l 18.0
18.5 1 J 2.5 118.0
19.5 108.8 118.0
l 8.2 111.1 l J 8.0
15.9 106.8 116.5
15.7 106.5 116.5
16.2 l 07.4 l 16.5
17,6 109.4 118.5
16.2 107.7 118.0
4
PERCENT
COMPACTION
93
91
91
94
94
92
91
93
92
93
90
91
94
92
90
94
94
90
95
92
94
92
92
92
92
91
REMARKS
TEST SOIL
NO. TYPE
27 3
28
29 3
30 3
31 4 ~., ,;k 3
33 3
34 3
35 .., .,
36 3
37 ,,
.)
38 l
39
40
41 2
42 4-
43 4
44 4
45 1
46 .., _,
47
48 ,,
.)
49 3
50
51 4
D!VER.'-i'lFIED DEVELOPMENT/ LA COSTA BLUfl'S PROJECTNO.01-11471110)
DEPTH
OFFILL
IN FEET
5
6
JO
12
13
2
15
10
17
4
19
8
2
4
6
8
10
7
4
8
5
10
12
14
15
PAGE T-1 (Continued)
TABLE OF TEST RESULTS
ASTM D1556
MAXIMUM
FIELD DRY HRY
MOISTURE DKNSJTY DENSITY
%DRY WT. P.C.:F. P.C.:F
19.5 110.2 118.0
19.3 108.0 118.5
18.2 108.7 118.0
17,9 108.7 l] 8.0
]6.7 107.1 115.0
18.7 107.5 118.0
15.8 107,9 l l 8.0
15.4 108.1 118.0
15.9 107.9 l 18.0
18.2 106.8 118.0
17.6 110.1 118.0
16.6 ll 1.7 118.5
18.7 110.4 118.5
18.5 108.4 118.5
16.4 106.0 116.5
19.7 105.3 115.0
17.3 103.8 ll5.0
20.0 106.4 115.0
19.8 107.0 118.5
16.2 107.4 l lS.O
17.8 108.5 118.5
15.6 109.3 118.0
l 8.2 108.5 118.0
18 .5 109.9 1 l 8.5
17.3 109.7 I 15.0
5
PERCENT
COMPACTION
93
91
92
92
93
91
91
92
91
90
93
94
93
92
91
92
90
93
90
91
92
93
92
93
95
REMARKS
TEST SOIL
NO. TYPE
52 4
53 ,, :,
54 3
55 3
56 3
57
58 ,,
.)
59 2
60 2
61 2
62 .,
.)
63 3
64 3
65 3
66 3
67 l
68
69 3
70
71 "' ·'
72 4
73 3
74 3
75 3
76 -~ .,
DlVERSlF!ED DEVELOPMENT/LA COSTA BLUFFS PROJECT NO. OJ-I /47HJ(l)
DEPTH
OF .FILL
INF.EET
2
4
6
'1 ..
4
6
8
10
2
12
13
15
7
9
16
]2
2
4
6
2
4
6
8
27 FG
10 FG
TABLE OF TEST RESULTS
ASTMD1556
MAXIMUM
FIELD DRY DRY
MOISTURE .DENSITY JJENSITY
%DRY WT. P.C.F. P.C.F
.17.8 108. l 115.0
17.4 !09.7 J 18.0
18.7 l I 0.1 118.0
17.8 108.9 118.0
19.0 109.3 118.0
19.6 111 .5 118.5
19.4 106.4 118.0
17.2 104.7 116.5
18.2 106,7 116.5
17.2 108.9 116.5
19.5 106.6 118.0
16.9 112.3 118.0
18.9 106.8 118.0
18.1 109.4 l J 8.0
18.2 110.7 118.0
17.6 109.J 118.5
18.5 J 08.3 118.5
18.2 109.1 118.0
18.4 111.7 118.5
18.3 110.7 118.0
l 6.1 108.0 115.0
17. l 109.1 118.0
17.4 108.9 118.0
16.8 11 O. l 118.0
16.9 110.5 118.0
FG = FJNISH GRADE
"
PERCENT
COMPACTION
94
93
93
92
93
94
90
90
92
93
90
95
91
93
94
92
91
92
94
94
94
92
92
93
94
REMARKS
DIVERS'.JFJED DEVELOPlvfENTI LA COSTA BLUFFS PROJECT NO OJ-l l47HJ(l)
PAGEL-1
LABORATORY TEST RESULTS
RESULTS OF MAXIMUM DENSITY AND Ol)TIMUM 1\1:0ISTURE
The maximum dry densities and optimum moisture contents of the fill materials as determined by ASTM
D 1557, Procedures A and 8 which use 25 blows of a 10-pound slide hammer falling from a height of 18
inches on each of 5 equal layers in a 4-inch diameter J /30 cubic foot compaction cylinder and Procedure
C which uses 56 blows of a 10-pound slide hammer falling from a height of 18 inches on each of 5 equal
layers in a 6-inch diameter 1/l3.3 cubic foot compaction cyl inder are presented as follows:
OPTIMUM
MAXIMUM MOISTURE
SOIL TYPE/ DRY DENSITY CONTENT
PROCEDURE DESCI{J.=-PT .... I=O=N-' -------=LB=/~C~-L~l·~F~T~. ----'-o/c~o =D=R~Y-'\:-'-V1~'-'--
1/ A BLUEISH GRAY CLAYEY SAND
2/ A LIGHT BROWN CLAYEY SAND
3/A LIGHT GRAY CLAYEY SAND
4i A LIGHT REDDISH BROWN CLAYEY SAND
118.5
l 16.5
118.0
115 .0
EXPANSION INDEX TEST (ASTM. ])4829)
INITIAL SATURATED IN ITJAL DRY
MOISTURE MOISTURE DENSITY EXPANS ION
13.0
13.5
14.8
14.0
CONTENT(%.,_) ___ C~ONTENT(o/<.,,,_,.o)'--____ _,(=-PC-=--'IJ. __ __.:I~N=:D=E=·x"------"'S'-=O=IL=· ·~T~Y~P=E
11.9 25.5 102.0 80 3
_;:.,,C,IJ(_E.
I II,,;. 35,:;:/
~F'-fO>:,) --.
; l
I '
@ /=!Cl~---t::> £':::~!/>51'/)/ ,7c? /T
1-·1r-l
t t Ac.~ /f,.,f,54
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EAST COUNTY SOIL CONSULTATION
& ENGINEERING, lNC.
10925 HARTLEY RD .. SUITE!. SANTEE. CA 92071
(6 l 9) 251\-790 I F:i.x (6 l 9) 25~!-7902
i I I
{
l 1(
11 I '
--==· ==·,=•· ==-==--===
Direct Shear Test Results
4.0 •········· ········· L ..
Ill Shear Strength at 0.2 inches l
of Oeformalion i
i;::-~.0 1----1----+----+---.----+---+---+------;----1---·····l
~
j
(I) 2.0 -------
I 00 -!----..---'----+--------------..,__ __ ,__ ____ ___,
0.0 o., 1.U 1.S 2.0 i.5 'I.fl
Confining Pressure (ksf)
SAMPLE
409 La Costa
Shear Strength at
DESCRIPTION
Tan Silty Sand w/Trace Clay
(Remold to 90%)
0.2 inches of Deformation
SOUTHERN CALIFORNIA
SOIL & TESTING
INTERNAL
FRJCTION
ANGLE(DEG.)
By:
Job Number:
45 5.0
COHESION
1NTERCEPT
(PSF)
319
East Co Soil
CA !Date:
1212031 I
1/24/2012
C 0 i -a
Consolidation
Sample Location
La Costa Avenue
0 ~--,~~~~~~····•···•·---
0.5
1
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0.1
SOUTHERN CALIFORNIA
1 10
Load Kips/Sq.Ft.
EAST COUNTY SOILS
! I I I
100
12/6/2011 SOIL & TESTING, INC. Sy: DRB!EL Date: 1-------~----.........-.il-----~---~ Job No.: 1112031 Figure: i
DIVERS/Fl ED DEVELOPkfENT/ LA COSTA BLUFFS PROJECT NO. 0l-l l47H!(I)
REFERENCES
l. "Response to City of Carlsbad's Review of Documents, 4 Proposed 6-Unit Residential Buildings,
(La Costa Bluff..'>, LLC Apartments), Lots 406 through 409, Map No. 6600, La Costa Avenue,
City of Carlsbad, California", Project No. 0l-1147Gl(J), Prepared by East County Soil
Consultation and Engineering, Inc., Dated December 6, 2011.
2. "Grading Plan, Foundation Plan and Details Rcvi.cw, 4 Proposed 6-Unit Residential Buildings,
Lots 406 through 409, Map No. 6600, La Costa Avenue, City of Carlsbad, California'', Project
No. 01-114701(1), Prepared by East County Soil Consultation and Engineering, Inc., Dated
December 6, 2011.
3. "Limited Site Investigation Update, 4 Proposed 6-Unil Residential Buildings, Lots 406 through
409, Map No. 6600, La Costa A venue, Chy of Carlsbad, California", Project No. 01-I l 4 7G l (l ),
Prepared by East County Soil Consultation and Engineering, Inc., Dated August 3, 2011.
4. "Addendum to Limited Site Investigation Update, Proposed 26-Unit Residential Development,
North Side of La Costa Avenue, West of R.omeria Street, City of Car.lsbad, California", Project
No. 01-1147GJ(lE), Prepared by East County Soil Consultation and Engineering. Inc., Dated
November 6, 2007.
5. "Limited Site Investigation Update, Proposed 26-Unit Apertment Complex, North Side of La
Costa Avenue, West of Romeria Street, City of Carlsbad, California", Project No. 0l-
l l47G1(LD), Prepared by East County Soil Consultation and Engineering, Inc., Dated March 5,
2007.
6. "Drainage Swale Clarification, Proposed Apartment Complex; Units No. 4 and 5, N01th Side of
La Costa Avenue, West of Romeria Street, City of Carlsbad, Califrm1ia", Project No. 0l-
l 147G 1 (l C), Prepared by East County Soil Consultation and Engineering, Inc., Dated February
17, 2004.
7. "Drainage Swale Assessment, Proposed 5-Unit Apartment Building, Lot 409, North Side of La
Costa A venue, West of Romeria Street, City of Carlsbad, California", Project No. 0 l ~
l 147Gl(IB), Prepared by East County Soil Consultation and Engineering, Inc., Dated Dec.ember
8, 2003.
8. "Addendum to Limited Site Investigation, Slope Stability Analysis and Drainage Swale
Location, Proposed 26-lJnit Apatiment Complex, 4 Vacant Lots, North Side of LA Costa
Avenue, West of Romeria Street, City of Carlsbad, California", Project No. 0l~J 147Gl(JA),
Prepared by East County Soil Consultation and Engineering, Inc., Dated May 20, 2003.
9. "Limited Site Investigation, Proposed 26-Unit Apartment Complex, North Side of LA Costa
Avenue, West of Romeria Street, City of Carlsbad, California", Project No. 0I-l l47Gl(l),
Prepared by East County Soil Consultation and Engineering, Inc., Dated June 9, 2001.
8
EAST COUNTY SOIL CONSULTATION
AND :ENGINEERING, INC.
10925 HARTLEY ROAD SUITE I
SANTEE CALIFORNIA 92071
619 258~7901
Fax 619 258-7902
Diversified Development
24335 Prielipp Road , Suite 112
Wildomar, California 92595
Subject: Foundation Excavation Observation
La Costa Bluffs Apartments
Lot No. 406, SDP 11-04, 2930 La Costa Avenue
City of Carlsbad, California 92008
Ladies & Gentlemen:
July 26, 2012
Project No. 01-l 147Hl(l)
In accordance v.rith your request, we have observed the foundation excavations for the proposed
two-story, apartment building on Lot No. 406 of the La Costa Bluffs A.partments project.
The footings have been excavated to the proper depth and width into compete.nt bearing soils and
are in compliance \Vith the approved building plans. Foundation excavations, soil expansion
characteristics and soil bearing capacity are in accordance with the referenced soils report
(Reference No. 1 ).
Ifwe can be of further assistance, please do not hesitate to contact our office.
Respectfolly Submitted,
D!VERS!flED DEVELOPlvfENTI LA COSTA BLUFFS PROJECT NO. 0 I-1 I 47 fl 1 (J)
REFERENCES
1. "Repo1t of Field Density Tests, La Costa Bluffs Apartments, Lot 406, SDP 11-04, 2930 La Costa Avenue,
-City of Carlsbad, California 92008", Project No. 0 l -1147G 1 (!),Prepared by East County Soil Consultation
and Engineering, foe., Dated Aptil 2, 2012.
2. "Response to City of Carlsbad's Review of Documents, 4 Proposed 6-Unit Residential Buildings, {La Costa
Bluffs, LLC Apartments), Lots 406 through 409, Map No. 6600, La Costa Avenue, City of Carlsbad,
California", Project No.01-114701(1), Prepared by East County Soil Con~ultation and Engineering, Inc.,
Dated December 6, 20 l l .
3. "Grading Plan, Foundation Plan and Details Review, 4 Proposed 6-Unit Residential Buildings, Lots 406
through 409, Map No. 6600, La Costa Avenue, City of Carlsbad, California", Project No. 0l-l l47G1(1),
.Prepared by East County Soil Consultation and Engineering, Inc., Dated December 6, 20 l l .
4. "Limited Site Investigation Update, 4 Proposed 6-Unit Residential Buildings, Lots 406 through 4091 Map
No. 6600, La Costa Avenue, City of Carlsbad, California", Project No. 01-114701(1), Prepared by East
County Soil Consultation and Engineering, Inc., Dated August 3, 2011 .
5. "Addendum to Limited Site Investigation Update, Proposed 26-Unit Residential Development, North Side
of La Costa A venue, West of Romcria Street, City of Carlsbad, California", Project No. 01-Il 4 70 l (l E),
Prepared by East County Soil Consultation and Engineering, Inc., Dated November 6, 2007.
6. "Limited Site Investigation Update, Proposed 26-Cnit Apmtment Complex, North Side of La Costa
Avenue, West of Romeria Street, City of Carlsbad, Califomia", Project No. 01-1147Gl(ID), Prepared by
East County Soil Consultation and Engineering, Inc., Dated March 5, 2007.
7. "Drainage Swale Clarification, Proposed Apartment Complex, Units No. 4 and 5, North Side of La Costa
Avenue, West of Romeria Street, City of Carlsbad, California", Project No. 01 • 11470 I (1 C), Prepared by
East County Soil Consultation and Engineering, Inc., Dated Febrna1y 17, 2004.
8. "Drainage Swale Assessment, Proposed 5-Unit Apartment Building, Lot 409, North Side of La Costa
Avenue, West of Romeria Street, City of Carlsbad, California", Project No. 0 l-1147G 1 (IB), Prepared by
East County Soil Consultation and Engineering, Inc., Dated December 8, 2003.
9. "Addendum w Limited Site Investigation, Slope Stability Analysis and Drainage Swale Location, Proposed
26-Unit Apartment Complex, 4 Vacant Lots, North Side of LA Costa Avenue, West of Romeria Street, City
of Carlsbad, California", Project No. 01-l l47Gl(lA), Prepared by East Co1mty Soil Consultation and
Engineering, Inc., Dated May 20, 2003.
JO. ,;Limited Site Investigation, Proposed 26-Unit Apartment Complex, North Side of LA Costa Avenue, West
of Romeria Street, City of Carlsbad, California", Project No. 01-114701(1), Prepared by East CoW1ty Soil
Consultation and Engineering, lnc., Dated June 9,2001.
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