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W E S T, I N C.
GEOTECHNICAL ■ ENVIRONMENTAL ■ MATERIALS
Project No. A9649-88-26
December 2, 2022
VIA EMAIL
Mr. Peter Tauscher, PE
Public Works Department
City of Newport Beach
100 Civic Center Drive, Bay 2D
Newport Beach, California 92660
Subject: REPORT OF OBSERVATION AND TESTING SERVICES
DURING PREPARATION OF BUILDING PAD
PROPOSED JUNIOR LIFEGUARD FACILITY
901 EAST OCEAN, NEWPORT BEACH, CALIFORNIA
GRADING PERMIT NO. X2022-1009
References: Geotechnical Investigation, by Geocon West, Inc., dated February 1, 2022;
Addendum to Geotechnical Investigation, by Geocon West, Inc., dated May 9, 2022;
Response to Geotechnical Report Review Checklist, by Geocon West, Inc., dated
July 11, 2022.
Rapid Impact Compaction, Junior
Construction Work Plan, prepared by
September 16, 2022.
Dear Mr. Tauscher:
Lifeguard Building, Newport Beach, CA,
Advanced GeoSolutions, Inc. (AGI), dated
In accordance with your request, we have provided testing and observation services during the
preparation of the building pad at the subject site. Our services were performed during the period of
October 18 through November 18, 2022. The scope of our services included the following:
• Observing the Rapid Impact Compaction (RIC) operations.
• Performing additional soil borings to observe the effectiveness of the RIC.
• Observing the grading operation to establish the rough pad grade.
• Performing in -place density tests on the soil materials placed and compacted.
• Performing laboratory tests to aid in evaluating the compaction characteristics of soil types used
for fill.
• Preparing a Site Plan and this report of observation and testing services.
2807 McGaw Avenue ■ Irvine, CA 92618 ■ Telephone (949) 491-6570. oc@geoconinc.com
GENERAL
The purpose of the testing and observations was to determine that the specifications required by the City
of Newport Beach, the California Building Code and the recommendations of the referenced reports were
followed. Grading was performed under City of Newport Beach Grading Permit No. X2022-1009.
This work was requested by Public Works Inspector Matt Bullman with the City of Newport Beach.
GRADING
Earthwork and site preparation consisted of Rapid Impact Compaction (RIC) performed by Advanced
GeoSolutions, Inc. (AGI), as well as rough grading to create a roughly level building pad following the
ground improvement.
RIC was performed by Advanced GeoSolutions, Inc. (AGI) during the period of October 18, 2022
through October 20, 2022. The area treated by the RIC ground improvement is indicated on the Site Plan
(Figure 1). Based on the RIC response statistics shared by AGI via email, deflections of less than
22 inches were observed during the RIC process. This is less than the performance criteria outlined in
the RIC submittal prepared by AGI.
Verification testing consisting of advancing 2 additional borings at the site was performed on October
25, 2022, using a truck -mounted hollow -stem auger drilling machine. The purpose of the additional
borings was to observe the effectiveness of the ground improvement. Representative and relatively
undisturbed Standard Penetration Test samples were obtained by driving the sampler into the
"undisturbed" soil mass with blows from a 140-pound auto -hammer falling 30 inches. Between a depth
of 5 feet and 11 feet, unadjusted blow counts equal to or greater than 18 were obtained. Based on the
information outlined in the Addendum Report dated May 9, 2022, this is the target criteria for improving
the soils to the desired state. Copies of the boring logs are attached to this report. It is the opinion of the
undersigned engineer that the ground improvement has achieved the intent of the geotechnical
recommendations.
Following the completion of the ground improvement, additional fill was placed to achieve a relatively
level building pad. Prior to placing any fill, the exposed subgrade was scarified to a depth of 12 inches,
moistened as required to achieve optimum moisture content, and compacted to a minimum of 90 percent
of the maximum density in accordance with ASTM test method D 1557 (Laboratory Compaction Test).
Fill was placed by means of a CAT 415 skip loader, in loose lifts of about 6 to 8 inches, moistened as
required to achieve optimum moisture content by means of a fire hose, and compacted by rolling with a
single drum vibratory roller (CAT CS-323C). Where failing tests occurred, additional compaction effort
was applied utilizing the above mentioned compaction equipment until passing tests were achieved.
Approximate limits and depths of engineered fill are indicated on the enclosed Site Plan (see Figure 1).
Geocon Project No. A9649-88-26 -2- December 2, 2022
In -place density tests were performed in conformance with ASTM Test Method D1556 (Sand Cone),
and ASTM Test Method D6938 (Nuclear Density Gauge) for soil. The results of the in -place dry density
and moisture content tests for soil are summarized on Table 1. In general, the in -place density test results
indicate that the earth materials placed have achieved a relative compaction of at least 90 percent in
accordance with ASTM test method D 1557 (Laboratory Compaction Test). The approximate locations
of all in -place density tests are indicated on the Site Plan (Figure 1).
Laboratory tests were performed on the materials used as engineered fill to evaluate moisture -density
relationships, optimum moisture content and maximum dry density. The results of the laboratory tests
are summarized in Table 2. Fill soils were derived from onsite excavations and consist primarily of silty
sand and clayey sand with gravel.
CONCLUSIONS AND RECOMMENDATIONS
1. GENERAL
1.1 Based on observations and test results, it is the opinion of Geocon West, Inc. that the grading
and placement of engineered materials has been performed in substantial conformance with
the requirements of the City of Newport Beach, the California Building Code and the
recommendations of the referenced reports.
2. Expansive Soils
2.1 The soils exposed at the subgrade elevation are in the "very low" expansion range. Special
considerations for expansive soils are not required.
3. Mat Foundation Design
3.1 A reinforced concrete mat foundation deriving support on the improved soils may utilize an
allowable soil bearing value of 3,500 pounds per square foot. The thickness of and
reinforcement for the mat foundation should be designed by the project structural engineer.
3.2 All foundation excavations should be observed by a representative of Geocon West, Inc. to
verify penetration into the recommended bearing materials. Foundations should be deepened
if necessary to extend into satisfactory earth materials. Foundation excavations should be
cleaned of all loose soils prior to placing steel and concrete. Any required foundation backfill
should be mechanically compacted, flooding is not permitted.
3.3 Resistance to lateral loading may be provided by friction acting at the base of foundations and
by passive earth pressure. An allowable coefficient of friction of 0.4 may be used with the
dead load forces.
Geocon Project No. A9649-88-26 - 3 - December 2, 2022
3.4 Passive earth pressure for the sides of foundations poured against newly placed engineered fill
may be computed as an equivalent fluid having a density of 280 pounds per cubic foot with a
maximum earth pressure of 2,800 pounds per square foot. When combining passive and
friction for lateral resistance, the passive component should be reduced by one-third. A one-
third increase in the passive value may be used for wind or seismic loads.
3.5 The RIC design was recommended to be designed based on settlement criteria of a maximum
combined static and seismic differential settlement of I inch over a distance of 40 feet with an
allowable bearing pressure of 3,500 pounds per square foot (psf).
4. Future Grading
4.1 Any additional grading performed at the site should be accomplished in conjunction with our
observation and compaction testing services. This office should be notified at least 24 hours
prior to commencing additional grading or fill placement operations.
5. Drainage
5.1 Proper surface drainage is critical to the future performance of the project. Uncontrolled
infiltration of irrigation excess and storm runoff into the supporting soils can adversely affect
the performance of the planned improvements. Saturation of a soil can cause it to lose internal
shear strength and increase its compressibility, resulting in a change in the original designed
engineering properties. Proper drainage should be maintained at all times.
5.2 Drainage should not be allowed to pond anywhere on the site, and especially not against any
foundation or retaining wall. Sealing planters which are located adjacent to foundations should
be considered to minimize moisture intrusion into the engineered fill.
5.3 Positive site drainage should be provided away from structures, pavement, and the tops of
slopes to swales or other controlled drainage structures. The building pad and pavement areas
should be fine graded such that water is not allowed to pond.
5.4 Landscaping planters immediately adjacent to paved areas could be detrimental to the paving
due to the potential for surface or irrigation water to infiltrate the pavement's subgrade and
base course. Either a subdrain, which collects excess irrigation water and transmits it to
drainage structures, or an impervious above -grade planter boxes should be considered.
In addition, where landscaping is planned adjacent to the pavement, it is recommended that
consideration be given to providing a cutoff wall along the edge of the pavement that extends
at least 12 inches below the base material.
Geocon Project No. A9649-88-26 - 4 - December 2, 2022
6. Closure
6.1 Fill which is placed beyond the limits shown on the Site Plan should be compacted with
suitable equipment and observed by our representative. Geocon West, Inc. assumes no
responsibility for compacted fill or earth materials placed beyond the limits shown by test
elevations on the Site Plan. Any additional fill which is placed is the responsibility of the
contractor to place in accordance with the approved plans and specifications.
6.2 Prior to placing steel or concrete in the footing excavations, a site visit must be made by a
representative of Geocon West, Inc. to see that the footings are free of loose and disturbed
material and are supported on the properly compacted fill (and/or undisturbed natural soils).
A 24-hour notice is requested for a site visit.
LIMITATIONS
The conclusions and recommendations contained herein apply only to our work with respect to grading,
and represent conditions at the date of our final observation, November 18, 2022. Any subsequent work
should be done in conjunction with our observation and testing services. As used herein, the term
"observation" implies only that we observed the progress of the work with which we agreed to be
involved. Our services did not include the evaluation or identification of the potential presence of
hazardous or corrosive materials. Our conclusions and opinions as to whether the work essentially
complies with the job specifications are based on our observations, experience, and test results.
Subsurface conditions, and the accuracy of tests used to measure such conditions, can vary greatly at any
time. We make no warranty, express or implied, except that our services were performed in accordance
with engineering principles generally accepted at this time and location.
We will accept no responsibility for any subsequent changes made to the site by others, by the
uncontrolled action of water, or by the failure of others to properly repair damages caused by the
uncontrolled action of water. The findings and recommendations of this report may be invalidated wholly
or partially by changes outside our control. Therefore, this report is subject to review and should not be
relied upon after a period of one year.
Geocon Project No. A9649-88-26 - 5 - December 2, 2022
If you have any questions regarding this report, or if we may be of further service, please contact the
undersigned at your convenience.
Very truly yours,
Jelisa Tho____
GE 3092
Enclosures: Figure 1, Site Plan
Boring Logs (2 pages)
Explanation of Coded Terms
Tables 1 and 2
Certification
(Email) Addressee
Geocon Project No. A9649-88-26 - 6 - December 2, 2022
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Fill to 1 feet.
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Backfilled with cement bentonite grout.
*Penetration resistance for 140-pound hammer falling 30 inches by
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Figure 1, A9549-85-26 BORING LOGS GPJ
Log of Boring 3, Page 1 of 1
SAMPLE SYMBOLS ❑ _. SAMPLING UNSUCCESSFUL [] -STANDARD PENETRATION TEST . ..DRIVE SAMPLE (UNDISTURBED)
® _. DISTURBED OR BAG SAMPLE W ... CHUNK SAMPLE i ... WATER TABLE OR SEEPAGE
NOTE. THE LOG OF SUBSURFACE CONDNIONS SHOWN HEREON APPLIES ONLY AT THE SPECIFIC BORING OR TRENCH LOCATION AND ATTHE DATE INDICATED.
IT IS NOT WARRANTED TO BE REPRESENTATIVE OF SUBSURFACE CONDITIONS AT OTHER LOCATIONS AND TIMES-
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Groundwater encountered at 7 feet.
Backfilled with cement bentonite grout.
*Penetration resistance for 140-pound hammer falling 30 inches by
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Figure 2, A9649-88-26 BORING LOGS GPJ
Log of Boring 4, Page 1 of 1
SAMPLE SYMBOLS [_1 . SAMPLING UNSUCCESSFUL ID...STANDARD PENETRATION MST .._DRIVE SAMPLE (UNDISTURBED)
RI .. DISTURBED OR BAG SAMPLE Q ... CHUNK SAMPLE t ... WATER TABLE OR SEEPAGE
NOTE: THE LOG OF SUBSURFACE CONDMONS SHOWN HEREON APPLIES ONLY AT THE SPECIFIC BORING OR TRENCH LOCATION AND AT THE DATE INDICATED_
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!A E V V V 1. V 401
W E IST, I N C.
GEOTECHNICAL ■ ENVIRONMENTAL ■ MATERIALS
ENGINEER'S CERTIFICATE OF COMPLIANCE
FOR
COMPACTED EARTH FILLS
LOCATION OF FILL:
JOB ADDRESS:
SOIL TESTING AGENCY:
PROPERTY OWNER'S NAME:
OWNER'S ADDRESS:
PER REPORTS ON OUR PROJECT NO:
DATE WORK STARTED ON PROJECT:
DATE FILL WAS COMPLETED:
DATE OF THIS CERTIFICATE:
TO THE SUPERINTENDENT OF BUILDING:
Building Pad (see Site Plan)
901 East Ocean
Newport Beach, California
Grading Permit No. X2022-1009
Geocon West, Inc.
City of Newport Beach
100 Civic Center Drive, Bay 2D
Newport Beach, California 92660
A9649-88-26
10/18/2022
11 /18/2022
12/2/2022
I hereby certify that I have personally observed and tested the placing of compacted earth fill on the
above described property, and on the basis of these observations and tests, it is my opinion that the
same was placed in conformity with the requirements of the City of Newport Beach Building Code and
California Building Code.' _^
2\
JelisarThom
G.E. 3092 —
'For the purpose of this Certificate, to "have personally observed and tested" shall include observation and testing
performed by any person responsible to the licensed engineer signing this Certificate. Where the inspection and
testing of all or part of the work above is delegated, full responsibility shall be assumed by the licensed engineer
whose signature is affixed thereon.
Business and Professions Code, Ch.229, Sec.3.6735.5. The use of the word "certify" or "certification" by a
registered professional engineer in the practice of professional engineering or land surveying constitutes an
expression of professional opinion regarding those facts or findings which are the subject of the certification, and
does not constitute a warranty or guarantee, either expressed or implied.
2807 McGow Avenue . Irvine, CA 92618 . Telephone (949) 491-6570 ■ oc@geoconinc.com