HomeMy WebLinkAboutCDP 2019-0002; SMITH (HILLSIDE DR) RESIDENCE; FINAL SOILS REPORT; 2022-04-15
15 April 2022
Mr. Jessie Smith Job No. 18-11842
447 Bougher Road
San Marcos, CA 92068
Subject: Report of Rough Grading Observations and Soil Testing
Smith Residence
4246 Hillside Drive
Carlsbad, California
Dear Mr. Smith:
Per our work agreement and as required by the City of Carlsbad, Geotechnical
Exploration, Inc. hereby presents this report of grading observations and soil
testing for the work performed at the project site, refer to Vicinity Map (Figure No.
I). The work reported herein was performed between June 22, 2021 and March 11,
2022. Our firm issued a Preliminary Geotechnical Investigation dated April 9, 2018,
followed by an Update Report of Preliminary Geotechnical Investigation dated
November 13, 2020 for the project site. We also issued the following documents:
1.) Response to City of Carlsbad Third-Party Reviewer (First); dated November
13. 2020;
2.) Response to City of Carlsbad Third-Party Reviewer (Second); dated April 13,
2021.
Smith Residence Job No. 18-11842
Carlsbad, California Page 2
FIELD OBSERVATIONS
1. Our representative was requested by the grading contractor, Hacienda
Development Solutions between June 22 and June 28, 2021 to observe the
grading and backfilling of the old canyon area located, approximately, near the
center of the lot. The grading of the canyon area consisted of excavating
approximately 12 feet below the finished grade surface (110.6 mean sea
level), down to the dense formational Old Paralic Deposits (Qop2-4) and later
backfilling the excavation. The loose soils encountered in the area of the new
driveway were also removed down to firm natural soils and subsequently
placed back and recompacted. Slope benches were properly made into the
dense formational soils Qop2-4 as grading continued upslope to the east in the
direction of the new residence, and to the north and west in the driveway area.
A storm drain culvert running north to south was installed in the area of the
old canyon. The canyon fill placement was observed and tested by our
representative for proper compaction and moisture.
2. Our representative was requested by the grading contractor to observe the
grading of the new residential building pad area intermittently between June
29, 2021 through March 11, 2022. The building pad was undercut
approximately at least 4 feet below the proposed finished pad elevation of
110.6 feet into dense Qop2-4 prior to backfill placement.
The garage building pad was moved to the southwest corner of the house
instead of the northeast section portion as shown on the grading plan. The
garage building pad was undercut approximately 3½ feet lower than the
building pad undercut elevation to approximately 103.1 feet mean sea level.
The bottom was observed to be founded in dense Qop2-4 prior to backfill
placement.
Smith Residence Job No. 18-11842
Carlsbad, California Page 3
On-site and imported soils were used for the backfill placement of the garage
and residential building pads with the backfills predominantly consisting of
imported soils. Imported soils were evaluated by our field representative and
determined were determined to be suitable as backfill material. Approximately
5 feet of recompacted fill was placed in the garage excavation, and 4 feet
approximately in the residential area of the building pad. The backfill
placement was observed and tested by our representative.
3. Our representative was requested to intermittently observe and test the
driveway soils between July 9 and November 19, 2021. The soils placed
underneath the driveway consisted predominantly of on-site soil material with
some areas containing small quantities of imported soils.
4. The storm drain culvert trench that runs perpendicular across the drive and
north to south across the backfilled canyon was observed and tested by our
representative on July 9. The storm drain excavation bottom was observed to
be founded into dense Qop2-4 formational soils. Areas where soft or loose
soils were encountered were removed and recompacted.
5. The soils placed around the perimeter of the north and south manhole boxes
were observed and tested per the request of the contractor by our
representative on August 31 and September 10, 2021.
6. The bearing soils for the footing excavations of the exterior site retaining walls
were intermittently observed per the request of the contractor between
September 24 and December 26, 2021. A joint was recommended to be added
at the northeast end perimeter retaining wall and the south due to a transition
layer. The joint was recommended at the top of the highest step. The
Smith Residence Job No. 18-11842
Carlsbad, California Page 4
remaining portions of wall without transitions were founded on recompacted
fill soils.
7. Backfill placement for the northside of the driveway retaining wall was
observed and tested by our representative per the request of the contractor
on November 19, 2021. Prior to backfill placement of the retaining wall, it was
observed that the contractor had placed waterproofing on the wall but no
drainage boards. Pictures were shown to our representative showing that the
storm drain outlet discharges towards the rip rap dissipater located south of
the driveway.
It should be noted that it is not within the scope of our services to provide
quality control oversight for surface or subsurface drainage construction or
retaining wall sealing and base of wall drain construction. It is the
responsibility of the contractor to verify proper wall sealing, geofabric
installation, protection board installation (if needed), drain depth below interior
floor or yard surfaces; pipe percent slope to the outlet, etc.
8. Backfill placement for the east side garage retaining wall was observed and
tested per the request of the contractor by our representative on January 20
through January 21, 2022. The grading contractor placed 2 feet of gravel
material at the bottom of the wall with a perforated PVC pipe wrapped with
geofabric, followed by 2 feet of recompacted fill soils.
9. We understand that after reviewing this report, the city of Carlsbad may
authorize foundation and slab construction for the residence structure.
Smith Residence Job No. 18-11842
Carlsbad, California Page 5
SOIL TESTING
Representative soil samples were collected during the grading to determine
laboratory maximum dry density of the soils per ASTM D1557-12e1. Field density
tests were performed at approximate locations shown on Figure No. II, Plot Plan in
accordance with ASTM D6938-17a. The complete list of field density tests results is
shown on Table A of Figure Nos. IIIa-b, and laboratory soil compaction test results
are shown on Table B of Figure No. IIIc.
Equipment used for the earthwork compaction consisted of a Mini-excavator, a Bob-
cat with rubber tires. A water hose was used, when needed, to increase the soil
moisture. Field density tests yielded a relative compaction of at least 90 percent of
maximum dry density at the tested locations. Density tests were performed with a
nuclear gauge testing apparatus in accordance with ASTM D6938-17a. The maximum
dry density of the soils was determined per ASTM D1557-12e1. The on-site soil
material used for the earthwork consisted of light and dark brown silty sand, and
reddish-brown silty sand. The imported soils consisted of brown and dark brown
clayey sand. The on-site soils were determined to have low expansion with an
expansion index (E.I.) values less than 50. The imported soils were visually classified
to have low expansion characteristics per ASTM D4829.
Proper finish drainage for the site was to be implemented by the general contractor
prior to completing construction.
SITE SUITABILITY AND COMPLIANCE
The observed and tested areas of the grading operation are, in our professional
opinion, suitable for their intended use. The dense formational soils are, in our
Smith Residence Job No. 18-11842
Carlsbad, California Page 6
professional opinion, suitable to support the recompacted fill, structure foundations,
and new exterior improvements.
We certify that the soil engineering aspects of grading are in general compliance with
the approved soils report and the grading plans.
LIMITATIONS
The findings and opinions presented herein have been made in accordance with
currently accepted principles and practice in the field of geotechnical engineering in
the City of Carlsbad in the County of San Diego. No warranty, either expressed or
implied, is made.
All statements in this report are applicable only for the grading operation observed
and tested by our firm. The firm Geotechnical Exploration, Inc. shall not be held
responsible for fill soils placed without our observations and testing at any other time,
or subsequent changes to the site by others, which directly or indirectly cause poor
surface or subsurface drainage, water erosion, and/or alteration of the strength of
the compacted fill soils.
As previously stated, it is not within the scope of our services to provide quality
control oversight for surface or subsurface drainage construction or retaining wall
sealing and base of wall drain construction. It is the responsibility of the contractor
to verify proper wall sealing, geofabric installation, protection board installation (if
needed), drain depth below interior floor or yard surfaces; pipe percent slope to the
outlet, etc.
Smith Residence Job No. 18-11842
Carlsbad, California Page 7
In the event that any changes in the nature, design, or location of the building or
improvements are planned, the conclusions and recommendations contained in this
report should not be considered valid unless the changes are reviewed and the
conclusions of this report modified or verified in writing.
This opportunity to be of service is sincerely appreciated. If you have any questions
regarding this letter, please contact our office. Reference to our Job No. 18-11842
will help expedite a response to your inquiry.
Respectfully submitted,
GEOTECHNICAL EXPLORATION, INC.
_______________________________ ______________________________
Jaime A. Cerros, P.E. Leslie D. Reed, President
R.C.E. 34422/G.E. 2007 C.E.G. 999/ PG 3391
Senior Geotechnical Engineer
______________________________
Richard A. Cerros, E.I.T.
Staff Engineer
Smith Residence
4246 Hillside Drive
Carlsbad, CA.
Figure No. I
Job No. 18-11842
SITE
VICINITY MAP
Thomas Bros. Guide San Diego County, pg 1106-G6
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