HomeMy WebLinkAbout6607; Cameo Road Storm Drain Replacement; Cameo Road Storm Drain Replacement; 2008-08-20Geotechnical and Environmental Sciences Consultants
August 20, 2008
Project No. 106328001
Ms. Sherri Howard, P. E.
Associate Engineer
City of Carlsbad
1635 Faraday Avenue
Carlsbad, California 92008
Subject: Floor Level Survey
Cameo Road Storm Drain and Water Main Replacement
Carlsbad, California
Dear Ms. Howard:
In accordance with your authorization, we have prepared this letter to present the results of our
floor level surveys for 2277 and 2283 Cameo Road in Carlsbad, California. Floor level surveys
were conducted inside the subject homes along the walls adjacent to the storm drain and water
main alignments. One survey was performed prior to construction on March 17, 2008, and the
second survey was performed after the construction was completed on May 15, 2008. Based on
the attached results of our floor level surveys it is our opinion that there is no evidence that det-
rimental soil movement has occurred as a result of the construction process. No additional floor
or wall cracks were observed in the homes during our second visit.
We appreciate the opportunity to be of service on this project.
Sincerely,
NINYO & MOORE
Andres Bernal, G.E.
Senior Project Engineer
ABS/FOM/kh
Attachment: Floor Level Survey Results
Francis O. Moreland, C.E.G.
Senior Geologist
5710RuffinRoad • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858) 576-9600
San Diego • Irvine • Ontario • Los Angeles • Oakland • Las Vegas • Carson City • Phoenix • Centennial
Geotechnical and Environmental Sciences Consultants
March 19, 2008
Project No. 106328001RECEIVED
'MAH V I M.
Ms. Sherri Howard, RE.
Associate Engineer ENGINEERS
City of Carlsbad DEPARTM^
1635 Faraday Avenue
Carlsbad, California 92008-7314
Subject: Limited Geotechnical Recommendations
Cameo Road Storm Drain Replacement
Carlsbad, California
Reference: Vinje & Middleton Engineering, Inc., "Preliminary Geotechnical Investigation,
Proposed Residential Development, El Camino Real, Carlsbad, California," dated
June 13, 2005.
Civil Engineering Design Group, Plan Set, "Buildable Pad and Driveway for
Worsch Residence, 167-080-35, Carlsbad, California," Sheets 2 through 5 of 7,
undated.
Dear Ms. Howard:
In accordance with your authorization, we have prepared limited geotechnical recommendations
for the Cameo Road storm drain replacement in Carlsbad, California. This letter presents our
geotechnical findings, conclusions, and recommendations regarding the construction of the pro-
posed storm drain replacement. Our recommendations are based on a reconnaissance of the site
and a review of a geotechnical report and plans by others for the proposed residence along the
eastern portion of the alignment.
BACKGROUND
Based on our discussions, the project will include the replacement of approximately 400 feet of
15-inch diameter corrugated metal pipe (CMP) storm drain that has corroded and is leaking. We
anticipate that the CMP will be replaced with an 18-inch PVC or RCP pipe. The storm drain ex-
tends from Cameo Road eastward between residential properties to El Camino Real. An existing
5710 Ruffin Road • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858) 576-9600
San Diego • Irvine • Rancho Cucamonga • Los Angeles • Oakland • Las Vegas • Phoenix • Denver • El Paso
Cameo Road Storm Drain Replacement March 19, 2008
Carlsbad, California Project No. 106328001
water main is located about 6 feet south of the storm drain alignment. The water main parallels
the storm drain.
OBSERVATIONS
We performed a reconnaissance of the site on March 13, 2008. During our reconnaissance water
was noted seeping out of the lower portion of the alignment. The observed seepage is surfacing
above the existing storm drain. According to City personnel, the volume of seepage increases
when water is entering the storm drain above. The source of the seepage is unknown.
RECOMMENDATIONS
Based on our review of the referenced report and the observations noted, we offer following
comments and recommendations for the storm drain construction.
• The proposed residence will be approximately 7 feet away from the proposed storm drain
alignment. The portion of the home adjacent to the storm drain alignment consists of a main
level of the home at a finish floor elevation of approximately 274 feet above mean sea level
(MSL), and a garage level with a finish floor elevation of approximately 257.5 feet MSL.
Assuming a 24-inch deep foundation, the bearing level for the main floor is expected to be at
an elevation of approximately 272 feet MSL. The depth of the proposed storm drain pipe
along the main level portion of the home ranges from 10 to 15 feet below the foundation
bearing level. At this depth the storm drain will be within the foundation bearing zone. In
order to protect the storm drain pipe from foundation surcharge loads and potential damage
during remedial grading for the adjacent home, we recommend that the storm drain pipe be
encased in concrete to 6 inches above the pipe in the section located within 10 feet of the
proposed home. Alternatively, the homeowner should found the home at a depth such that it
does not impose a load on the storm drain.
• Excavation of the portion of the storm drain alignment east of approximately Station 3+00 is
likely to encounter saturated conditions that can not be adequately supported by shoring. We
recommend that where saturated conditions are encountered and where conventional cut-
and-cover excavations are performed the trench side walls be sloped back at 2:1 (horizontal
to vertical).
• Seepage is likely to be encountered in the eastern portion of the storm drain trench during
construction. Unstable bottom conditions may be mitigated by over-excavating the excava-
tion bottom to suitable depths and replacing the unstable material with gravel and/or a
geotextile fabric.
106328001 R.doc
Cameo Road Storm Drain Replacement
Carlsbad, California
March 19, 2008
Project No. 106328001
LIMITATIONS
The field evaluation and geotechnical analyses presented in this report have been conducted in
accordance with current engineering practice and the standard of care exercised by reputable
geotechnical consultants performing similar tasks in this area. No warranty, implied or ex-
pressed, is made regarding the conclusions, recommendations, and professional opinions
expressed in this report. Variations may exist and conditions not observed or described in this
report may be encountered. Our preliminary conclusions and recommendations area based on an
analysis of the observed conditions and the referenced background information.
We appreciate the opportunity to be of service on this project.
Sincerely,
NINYO & MOORE
Andres Bernal, G.E.
Senior Project Engineer
ABS/FOM/JG/atf
Distribution: (1) Addressee
Francis O. Moreland, C.E.G
Senior Geologist /c?.
' FRANCIS OJ
No 2
CERTIFIED
106328001 R.doc
oore
Geotechnical and Environmental Sciences Consultants
June 27, 2008
Project No. 106328002
; Nfc-L.Ms. Sherri Howard
City of Carlsbad
1635 Faraday Avenue
Carlsbad, California 92008
Subject: Summary of Compaction Test Results
Cameo Road Storm Drain
Carlsbad, California
Dear Ms. Howard:
In accordance with your request, Ninyo & Moore has provided geotechnical testing services dur-
ing construction of the Cameo Road Storm Drain project located in Carlsbad, California.
Construction generally occurred between March 25, 2008 and April 16, 2008. Our services con-
sisted of on-call testing during the placement of storm drain backfill. This letter summarizes our
services and presents the results of our field and laboratory testing.
Laboratory testing was performed on representative samples of material used for storm
drain backfill to evaluate modified Proctor density and optimum moisture content. Labora-
tory testing of the samples was conducted in general accordance with American Society for
Testing and Materials (ASTM) D 1557 and the results are presented in Table 1, Modified
Proctor Density Test Results.
Field density testing of the storm drain backfill was performed in general accordance with the
ASTM D 6938 (Nuclear Method). The specified relative compaction for the storm drain back-
fill was 90 percent of the modified Proctor density. During the earthwork operations, when a
field density test was performed that resulted in less than the specified relative compaction, the
area was generally reworked and a retest was performed. The results of the field density tests
are presented in Table 2, Summary of Field Density Tests. The approximate locations of the
field density tests are shown on Figure 1, Field Density Test Location Map. The field density
5710 Ruffin Road • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858J 576-9600
San Diego • Irvine • Ontario • Los Angeles • Oakland • Las Vegas • Carson City • Phoenix • Denver
Cameo Road Storm Drain
Carlsbad, Californa
June 27, 2008
Project No. 106328002
tests performed during the placement of storm drain backfill indicated the specified relative
compaction after testing the reworked areas.
The geotechnical services outlined in this report have been conducted in accordance with current
practice and the standard of care exercised by geotechnical consultants performing similar tasks
in this area. No warranty, expressed or implied, is made regarding the observations and conclu-
sions expressed in this report. The reported test results represent the relative compaction and
moisture content at the locations tested. It is important to note that the precision of field density
tests and the maximum dry density test is not exact and variations should be expected. The re-
ported locations and elevations of the density tests are estimated based on correlations with the
site plans. Further accuracy is not implied.
Respectfully submitted,
NINYO & MOORE
/>&/'Francis O. Moreland, C.E.G.
Senior Geologist
FOM/MC/gg
Mark Cuthbert, RE.
Principal Engineer
Attachments: Table 1 - Modified Proctor Density Test Results
Table 2 - Summary of Field Density Tests
Figure 1 - Field Density Test Location Map
Distribution: (3) Addressee
106328002 L Storm Drain.doc
Cameo Road Storm Drain
Carlsbad, California
June 27 2008
Project No. 106328002
Table 1 - Modified Proctor Density Test Results
Soil
Type No.
1
2
3
Description
Yellowish tan silty SAND
Reddish brown silty SAND
Brown silty SAND
Laboratory
Dry Density
(pcf)
125.0
130.5
126.5
Optimum
Moisture Content
(%)
10.5
7.5
9.5
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Geotechnical and Environmental Sciences ConsuJtants
June 27, 2008
Project No. 106328002
Ms. Sherri Howard
City of Carlsbad
1635 Faraday Avenue
Carlsbad, California 92008
Subject: Summary of Compaction Test Results
Cameo Road Storm Drain
Carlsbad, California
Dear Ms. Howard:
In accordance with your request, Ninyo & Moore has provided geotechnical testing services dur-
ing construction of the Cameo Road Storm Drain project located in Carlsbad, California.
Construction generally occurred between March 25, 2008 and April 16, 2008. Our services con-
sisted of on-call testing during the placement of storm drain backfill. This letter summarizes our
services and presents the results of our field and laboratory testing.
Laboratory testing was performed on representative samples of material used for storm
drain backfill to evaluate modified Proctor density and optimum moisture content. Labora-
tory testing of the samples was conducted in general accordance with American Society for
Testing and Materials (ASTM) D 1557 and the results are presented in Table 1, Modified
Proctor Density Test Results.
Field density testing of the storm drain backfill was performed in general accordance with the
ASTM D 6938 (Nuclear Method). The specified relative compaction for the storm drain back-
fill was 90 percent of the modified Proctor density. During the earthwork operations, when a
field density test was performed that resulted in less than the specified relative compaction, the
area was generally reworked and a retest was performed. The results of the field density tests
are presented in Table 2, Summary of Field Density Tests. The approximate locations of the
field density tests are shown on Figure 1, Field Density Test Location Map. The field density
5710 Ruffin Road • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858J 576-9600
San Diego • Irvine • Ontario • Los Angeles • Oakland • Las Vegas • Carson City • Phoenix • Denver
Cameo Road Storm Drain
Carlsbad, Californa
June 27, 2008
Project No. 106328002
tests performed during the placement of storm drain backfill indicated the specified relative
compaction after testing the reworked areas.
The geotechnical services outlined in this report have been conducted in accordance with current
practice and the standard of care exercised by geotechnical consultants performing similar tasks
in this area. No warranty, expressed or implied, is made regarding the observations and conclu-
sions expressed in this report. The reported test results represent the relative compaction and
moisture content at the locations tested. It is important to note that the precision of field density
tests and the maximum dry density test is not exact and variations should be expected. The re-
ported locations and elevations of the density tests are estimated based on correlations with the
site plans. Further accuracy is not implied.
Respectfully submitted,
NINYO & MOORE
Francis O. Moreland, C.E.G.
Senior Geologist
FOM/MC/gg
Mark Cuthbert, RE.
Principal Engineer
Attachments: Table 1 - Modified Proctor Density Test Results
Table 2 - Summary of Field Density Tests
Figure 1 - Field Density Test Location Map
Distribution: (3) Addressee
106328002 L Storm Drain doc
Cameo Road Storm Drain
Carlsbad, California
June 27 2008
Project No. 106328002
Table 1 - Modified Proctor Density Test Results
Soil
Type No.
1
2
3
Description
Yellowish tan silty SAND
Reddish brown silty SAND
Brown silty SAND
Laboratory
Dry Density
(pcf)
125.0
130.5
126.5
Optimum
Moisture Content
(%)
10.5
7.5
9.5
106328002 L Storm Drain.doc 1 of 1
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Geotechnical and Environmental Sciences Consultants
June 27, 2008
Project No. 106328002
Ms. Sherri Howard
City of Carlsbad
1635 Faraday Avenue
Carlsbad, California 92008
Subject: Summary of Compaction Test Results
Cameo Road Water Main
Carlsbad, California
Dear Ms. Howard:
In accordance with your request, Ninyo & Moore has provided geotechnical testing services dur-
ing construction of the Cameo Road Water Main project located in Carlsbad, California.
Construction generally occurred between April 11, 2008 and April 21, 2008. Our services con-
sisted of on-call testing during the placement of water main backfill. This letter summarizes our
services and presents the results of our field and laboratory testing.
Laboratory testing was performed on representative samples of material used for water
main backfill to evaluate modified Proctor density and optimum moisture content. Labora-
tory testing of the samples was conducted in general accordance with American Society for
Testing and Materials (ASTM) D 1557 and the results are presented in Table 1, Modified
Proctor Density Test Results.
Field density testing of the water main backfill was performed in general accordance with the
ASTM D 6938 (Nuclear Method). The specified relative compaction for the water main back-
fill was 90 percent of the modified Proctor density. During the earthwork operations, when a
field density test was performed that resulted in less than the specified relative compaction, the
area was generally reworked and a retest was performed. The results of the field density tests
are presented in Table 2, Summary of Field Density Tests. The approximate locations of the
field density tests are shown on Figure 1, Field Density Test Location Map. The field density
5710 Ruffin Road • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858) 576-9600
San Diego • Irvine • Ontario • Los Angeles • Oakland • Las Vegas • Carson City • Phoenix • Denver
Cameo Road Water Main
Carlsbad, California
June 27, 2008
Project No. 106328002
tests performed during the placement of water main backfill indicated the specified relative
compaction after testing the reworked areas.
The geotechnical services outlined in this report have been conducted in accordance with current
practice and the standard of care exercised by geotechnical consultants performing similar tasks
in this area. No warranty, expressed or implied, is made regarding the observations and conclu-
sions expressed in this report. The reported test results represent the relative compaction and
moisture content at the locations tested. It is important to note that the precision of field density
tests and the maximum dry density test is not exact and variations should be expected. The re-
ported locations and elevations of the density tests are estimated based on correlations with the
site plans. Further accuracy is not implied.
Respectfully submitted,
NINYO & MOORE
Francis O. Moreland, C.E.G.
Senior Geologist
FOM/MC/gg
Mark Cuthbert, RE.
Principal Engineer
Attachments: Table 1 - Modified Proctor Density Test Results
Table 2 - Summary of Field Density Tests
Figure 1 - Field Density Test Location Map
Distribution: (3) Addressee
FRANC1SO.MORELAND
No 2071
CERT1RED
NGINEERIN
GEOLOGIST
106328002 L Water Main.doc
Cameo Road Water Main
Carlsbad, California
June 27, 2008
Project No. 106328002
Table 1 - Modified Proctor Density Test Results
Soil
Type No.
1
2
3
Description
Yellowish tan silty SAND
Reddish brown silty SAND
Brown silty SAND
Laboratory
Dry Density
(pcf)
125.0
130.5
126.5
Optimum
Moisture Content
(%)
10.5
7.5
9.5
106328002 L Water Main.doc 1 of 1
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Geotechnical and Environmental Sciences Consultants
June 27, 2008
Project No. 106328002
Ms. Sherri Howard
City of Carlsbad
1635 Faraday Avenue
Carlsbad, California 92008
Subject: Summary of Compaction Test Results
Cameo Road Water Main
Carlsbad, California
Dear Ms. Howard:
In accordance with your request, Ninyo & Moore has provided geotechnical testing services dur-
ing construction of the Cameo Road Water Main project located in Carlsbad, California.
Construction generally occurred between April 11, 2008 and April 21, 2008. Our services con-
sisted of on-call testing during the placement of water main backfill. This letter summarizes our
services and presents the results of our field and laboratory testing.
Laboratory testing was performed on representative samples of material used for water
main backfill to evaluate modified Proctor density and optimum moisture content. Labora-
tory testing of the samples was conducted in general accordance with American Society for
Testing and Materials (ASTM) D 1557 and the results are presented in Table 1, Modified
Proctor Density Test Results.
Field density testing of the water main backfill was performed in general accordance with the
ASTM D 6938 (Nuclear Method). The specified relative compaction for the water main back-
fill was 90 percent of the modified Proctor density. During the earthwork operations, when a
field density test was performed that resulted in less than the specified relative compaction, the
area was generally reworked and a retest was performed. The results of the field density tests
are presented in Table 2, Summary of Field Density Tests. The approximate locations of the
field density tests are shown on Figure 1, Field Density Test Location Map. The field density
5710 Ruffin Road • San Diego, California 92123 • Phone (858) 576-1000 • Fax (858) 576-9600
San Diego • Irvine • Ontario • Los Angeles • Oakland • Las Vegas • Carson City • Phoenix • Denver
Cameo Road Water Main
Carlsbad, California
June 27, 2008
Project No. 106328002
tests performed during the placement of water main backfill indicated the specified relative
compaction after testing the reworked areas.
The geotechnical services outlined in this report have been conducted in accordance with current
practice and the standard of care exercised by geotechnical consultants performing similar tasks
in this area. No warranty, expressed or implied, is made regarding the observations and conclu-
sions expressed in this report. The reported test results represent the relative compaction and
moisture content at the locations tested. It is important to note that the precision of field density
tests and the maximum dry density test is not exact and variations should be expected. The re-
ported locations and elevations of the density tests are estimated based on correlations with the
site plans. Further accuracy is not implied.
Respectfully submitted,
NINYO & MOORE
Francis O. Moreland, C.E.G.
Senior Geologist
FOM/MC/gg
Mark Cuthbert, RE.
Principal Engineer
Attachments: Table 1 - Modified Proctor Density Test Results
Table 2 - Summary of Field Density Tests
Figure 1 - Field Density Test Location Map
Distribution: (3) Addressee
106328002 L Water Main.doc
Cameo Road Water Main
Carlsbad, California
June 27, 2008
Project No. 106328002
Table 1 - Modified Proctor Density Test Results
Soil
Type No.
1
2
3
Description
Yellowish tan silty SAND
Reddish brown silty SAND
Brown silty SAND
Laboratory
Dry Density
(pci)
125.0
130.5
126.5
Optimum
Moisture Content
(%)
10.5
7.5
9.5
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