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~ PACIFIC SOILS ENGINEERING, INC.
710 E. PARKRIDGE AVENUE, SUITE 105, CORONA, CA 92879
TELEPHONE: (909) 582-0170, FAX: (909) 582-0176
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STANDARD PACIFIC HOMES
255 East Rincon Street, Suite 200
Corona, California 92879-1330
Attention: Mr. Adam Smith
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Subject: PROJECT GRADING REPORT,
Lots 1 through 76, Tract No. 29798-F
Wolf Creek Project, City of Temecula,
County of Riverside, California
Reference: See Appendix A
Gentlemen:
November 5, 2004
Work Order 700007-G
Presented herein is a summary of Pacific Soils Engineering, Inc.'s (PSE) observations and test
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results pertaining to the completion of rough grading of Lots 1 through 76 of Tract 29798-F,
Wolf Creek Project, in the City of Temecula, County of Riverside, California. Rough grading
for the subject lots began in September 2003 and was completed in October 2004. ~
The enclosed 40-scale grading plans (Sheet 17 and 18 of 23) prepazed by Lohr and Associates
have been used as a base for this report, and have been designated as Plates 1 and 2 for the
purposes of this report. Plates 1 and 2 depict the approximate locations of the compaction tests
conducted during rough grading operations, the geologic information, and the removal bottom
elevations. Also presented herein are geotechnical recommendations for your use during the
design and construction of the foundations and infrastructure based on field and laboratory
testing of as-graded soil conditions.
Based on the testing and observations conducted by PSE, the work as described in this document
is considered to be in general conformance with the City of Temecula Grading Code, the 40-
scale Rough Grading Plans, and the referenced geotechnical repoRs. Rough grading conducted
to date, immediately adjacent to the area reported herein, is considered to be sufficient to provide
lateral support to the subject lots.
~RPOHATEHEAD~UARTEHS ~OSANGELES COUNTV SOUTH ORANGE COUNTV SAN DIEGO COUNTV
TEI:(7/4)220-0]10 TEL:(310)325-7272 or(323)]75-6771 TEL (]tA)730-2122 TEL (85B)560-1713
FA%: p14) 220-9589 FAX: (]14) 220-9589 FAX: (716) 130-519/ FAX: (858) 560-0380
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Work Order 700007-G . Page 2
November 5, 2004
1.0 ENGINEERING GEOLOGY
1.1 Geolo¢ic Units
The geologic units encountered during the grading of the subject lots were
undocumented artificial fill and alluvium. The as-graded distribution of these
units is presented on Plates 1 and 2.
1.1.1 Artificial Fill-Undocumented
Undocumented artificial fill associated with unimproved dirt roads existed
onsite. All undocumented artificial fill was removed prior to fill
placement.
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1.1.2 Alluvium (Map Svm6o1 Oal)
Holocene-age alluvium encountered during grading of the subject lots
consisted of silty sands and sandy silts. The upper five (5) feet of the
alluvial materials was removed prior to placement of compacted fill. Spot
elevations of approved removal bottoms are shown on the enclosed plans.
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1.3 Structure
The alluvium was observed to be essentially flat lying. No faults or joints were
observed during this phase of grading.
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1.2 Groundwater
Groundwater was not encountered during this phase of grading.
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1.4 Conclusions
From an engineering geologic viewpoint, Lots 1 through 76 of Tract 29798-F in
the City of Temecula, Califomia are suitable for their intended residential use.
SOIL ENGINEERING
Prior to fill placement reported herein, PSE representatives observed removals,
excavations, cleanouts and processing in preparing fill areas. Fill materials were placed
and tested under the observation and testing of PSE personnel. The following is a
summary of our observations.
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PACIFIC SOtLS ENCi1NEERING, INC.
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Work Order700007-G
November 5, 2004
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2.1 Removals
Page 3
By design, shallow (1-2 feet) fills were proposed for the subject lots. All existing
.~ fill and a minimum of the upper five (5) feet of natural soils were removed prior
to fill placement. The approximate removal bottom elevations shown on the
enclosed plans (Plates 1 and 2) were obtained by the grading contractor personnel
utilizing a laser and survey control points provided by the Civil Engineer.
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2.2 Treatment of Removal Bottoms
Prior to compacted fill placement, the exposed surfaces at the bottom of removals
were scarified, moisture conditioned to neaz optimum moisture content, and
~ compacted in-place to a minimum 90 percent of the laboratory maximum density
(ASTM D 1557).
2.3 Comnacted Filt Placement
~ Fill consisting of the soil types indicated in Table I(Appendix B) was placed in
thin lifrs (approximately six- (6) to eight- (8) inches), moisture conditioned to
optimum moisture content or slightly above, and compacted to a minimum 90
percent of the laboratory maximum dry density (ASTM D 1557). Compaction
was accomplished utilizing self-propelled, rubber-tired and sheepsfoot
compactors, along with heavy earth moving equipment. Each succeeding fill lift
was treated in a similar manner.
2.4 Comaaction Test Results
A summary of the compaction test results is presented in Table I(Appendix B),
and the approximate locations of these tests are shown on the enclosed 40-scale
grading plan (Plates 1 and 2). Compaction testing was conducted utilizing the
sand cone method (ASTM D 1556) and Campbell Pacific nuclear test gauges
(ASTM D 2922 and D 3017).
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PACIFIC SOIL3 ENGINEEFIiNG, INC.
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Work Order700007-G
November 5, 2004
Page 4
2.5 Death of Fill
Compaction testing was performed approximately for each one (1) to two (2) feet
of fill placed. The approximate maximum vertical depth of fill placed during
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grading, within the limits of this report, is on the order of twelve (12) feet in the
vicinity of Lots 12-15. The approximate maximum vertical depth of fill placed on
individual lots is summarized in Table II (Appendix B).
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2.6 Cut/Fill Transition Lot Overexcavation
The cut and shallow fill portions of cuUfill transition lots were overexcavated to
provide a minimum of five (5) feet of compacted fill. Table 2.1 presents a
~ summary of the cu11fi11 transition lots.
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~ TABLE 2.1'
-CuUFill Trsnsition Lots'Overeicavated and
Replaced'with Compacted Fitl.'
I 29798-F I 12,28-30 I
2.7 Cut Lot Overexcavation
The lots listed in Table 2.2 were originally designed as cut lots and were
overexcavated a minimum of five (5) feet and replaced with compacted fill.
' TABLE 2.2 ' .
Design Cut L'ots Ove~excavated and.Replaced wit6 Compacted Fill .
Tract Lot #
29798-F 1-11,13-27,31-76
2.8 Fill Slooes
Fill slopes were overfilled approximately 5 feet, measured horizontally. The
slope was then trimmed back to the compacted core upon completion of grading.
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PACIFIC SOILS ENGINEERING, INC.
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Work Order 700007-G
November 5, 2004
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Page 5
Finish slope surfaces have been probed and/or tested and aze considered to satisfy
the project requirements and the grading codes of the City of Temecula.
~ Based on the results of tests and observations collected during the rough grading
operations, it is PSE's opinion that all slopes constructed under the purview of this
report aze considered to be grossly and surficially stable at this time, and should
remain so under normal conditions. As is the case with any graded slope, proper
~ drainage, maintenance, and landscaping are essential to long-term performance
and should be implemented as soon as possible.
3.0 DESIGN RECOMMENDATIONS
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The building pad azeas of the subject lots will be utilized to construct one and two-story,
wood frame, residential structures. Precise building plots and loading details are not
currently available since individual planning azeas aze to be sold to various merchant
• builders. Unless unusual sitings, configurations, or loading conditions aze proposed, it is
likely that structures can be supported on post-tensioned slabffoundation systems.
Recommendations for the design of foundations should be made based upon specific
struchue sitings and loading conditions, when available.
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Bulk samples were collected during grading and near finish surface and representative
samples were subjected to a series of tests in order to characterize the near-surface soil
characteristics. In addition to determining the laboratory maximum dry density and
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optimum moisture content, tests conducted on selected samples included grain size
analyses (modified hydrometer portion), ASCE Expansion Index tests, and chemical tests
for sulfates. Table 3-1 presents a summary of the results of the hydrometer analyses, the
ASCE Expansion Index tests, and sulfate tests. These tests are presented for information
and budgeting purposes only. The engineer of record for the residential unit development
should conduct additional tests as deemed necessary in consideration of individual
building improvements. Specific slab and foundation design recommendations should be
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PACIFIC SOIL3 ENGINEEpiNG, INC.
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Work Order 700007-G
November 5, 2004
Page 6
provided by the engineer of record based upon review of specific plans for proposed
improvements.
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- . . TABLE 4-1 .
~ - . Summary'of Hydrometer, Expansion'IndexButtate ContentTesting ,_
Sample Expansion Expaosion Hydrometer Analyses Chemical
Lot #'s Index Potential Gravel Sand Silt Clay Sulfate Content (%
wei ht
1-3 6 VeryLow 0 47 35 ]8 0.000
4-6 46 Low 0 33 41 26 0.016
7-10 27 Low 0 50 33 17 0.000
i1-12 5 VeryLow 0 61 22 17 0.009
13-15 0 VeryLow 0 59 3] ]0 <0.001
16-I S 4 Very Low 0 62 24 14 0.001
19-21 20 VeryLow 0 62 24 14 0.002
22-24 21 Low 0 51 30 19 0.005
25-27 5 VeryLow 0 59 26 15 0.003
28-29 4 Very Low 0 61 22 17 0.001
30-32 20 VeryLow 0 52 29 ]9 <0.001
33-35 25 Low 0 50 33 1~ <0.001
36-38 27 Low 0 49 32 19 0.003
39-41 27 Low 0 54 29 17 0.007
42-44 2 Very Low 0 71 20 9 0.003
45-47 18 Very Low 0 57 2'7 16 <0.001
48-50 38 Low 0 50 31 19 0.001
51-54 4 Very Low 0 74 17 9 <0.001
55-57 6 Very Low 0 66 22 12 <0.001
58-60 4 Very Low 0 55 29 16 0.006
61-63 29 Low 0 54 29 17 <0.001
64-66 6 VeryLow 0 55 31 14 0.001
67-69 12 Very Low 0 59 26 15 O.OOI
70-72 17 Very Low 0 52 31 17 0.001
73-76 18 VeryLow 0 54 29 17 <0.001
4.0 UTILITY TRENCH EXCAVATION & BACKFILL
~ All utility trenches should be shored or laid back in accordance with applicable OSHA
standazds. Mainline and lateral utility trench backfill should be compacted to at least 90
percent of maximum laboratory dry density as determined by ASTM Test Method: D-
~ 1557. On-site soils may not be suitable for use as bedding material but will be suitable
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PACIFIC SOILB ENGINEERING, INC.
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Work Order700007-G
November 5, 2004
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Page 7
for use in backfill. Compaction should be accomplished by mechanical means. Jetting of
native soils will not be acceptable.
~ 5.0 SLOPE AND LOT MAINTENANCE
Slope planting should consist of ground cover, shrubs, and trees that possess deep, dense
root structures and require a minimum of irrigation. It is the responsibility of the
~ homeowner and/or Homeowners Association to maintain such planting. Those parties
are responsible for maintenance and cleaning of all drainage tenaces, down drains and
other devices that have been installed to promote structure and slope stability.
~ Periodic observation, clearing and repairs of these devices should be conducted. A
program for the elimination of burrowing animals should be implemented in a timely
manner soon after completion of the rough grading operations. This program should be
on-going in order to maintain slope stability and a licensed exterminator with experience
~ in hillside maintenance should be engaged to control burrowing animals.
Positive drainage, away from structures and slopes should be provided and maintained.
Design fine grade elevations should be maintained through the life of the structure. If
~ design fine grade elevations are altered, adequate area drains should be installed in order
to provide rapid discharge of water, away from the structure.
The resident or owner is responsible for proper irrigation and for maintenance and repait
~ of properly installed irrigation systems. Leaks should be repaired immediately.
Sprinklers should be adjusted to provide uniform coverage with a minimum of water
usage and overlap. Over-watering with consequent wasteful runoff and serious ground
saturation should be avoided. If automatic sprinkler systems are installed, their use must
be adjusted to account for natural rainfall conditions.
6.0 HOMEOWNER CONSTRUCTION AND MAINTENANCE RESPONSIBILITIES
During and upon completion of mass grading of the subject site, representative soil
samples were tested for expansive soil characteristics and soluble sulfate concentrations.
In addition, certain lots contain manufactured slopes within or adjacent to the building
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PAGIFIC SOILS ENGINEERING, ING.
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Work Order 700007-G Page 8
November 5, 2004
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pad area. All of these conditions should be considered in design, construction, and
maintenance of homeowner improvements. The homeowners should be advised of
certain responsibilities they must accept in consideration of these factors. Suggested
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information to educate the homeowners regarding these responsibilities is presented in
Appendix C. We suggest that this information be provided to all homeowners as part of
an information packet during the sales process.
~ This report presents information aad data relative to the mass grading and/or ptacement of
compacted fill at the subject site. A representative(s) of t6is firm conducted periodic tests
and observations during the progress of the construction in an effort to determine whether
compliance with the project drawings, speci6cations and Building Code were being
obtained. The presence of our personnel during the work process did not involve the
~ direction or supervision of the contractor. Technical advice and suggestions were provided
to the owner and/or his represeutative based upon the results of the tests and observations.
Completed work under the purview of t6is report is considered suitable for the intended
use. Conditions of the reference reports remain applicable unless specifically superseded
herein.
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PSE appreciates the opportunity to provide you with geotechnical consulting services. If you
have any questions or should you require any additional information, please contact the
undersigned at (951) 582-0170.
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Respectfully submitted,
PACIFIC.SOILS ENGb
• By:
Reg. Exp.: 1
Registered (
Dist: (4) Addressee
700007-G November 5, 2004 (Tract -F)
Reviewed by:
Jfi4Iv~'ES B. Cr~.~S/RGE
~'~~E 30 80/Reg. Exp.: 3-31
Chief erations Offic r
C~~~ ~~~~
6~.3~3U08
DEAN C. ARMSTRONG/CEG
Reg. Exp.: 9-30-04
Vice President
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Cq ~y ~~'~ `';~~
w No. CEG ~ 197, -~
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PACIFIC SOILS ENGINEERING, INC.
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APPENDIX A
References
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PACIFIC SOILS EN6INEERING, INC.
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Work Order 700007-G Page A-1
November 5, 2004
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APPENDIX A
Reference List
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1. Pacific Soils Engineering, Inc., 2004, Review of Foundation Plans, Tract No. 29798, Wolf
Creek Specific Plan, City of Temecula, California, dated March 17, 2004 (Work Order
700007-G).
2. Pacific Soils Engineering, Inc, 2003a, Seismic Design Parameters, Tract No. 29798, Wolf
I• Creek Specific Plan, City of Temecula, California, dated December 1, 2003 (Work Order
700007-G).
3. Pacific Soils Engineering, Inc., 2003b, Retaining Wall Foundation Design
Recommendations, Tentative Tract 29798, Wolf Creek Project, City of Temecula, California,
~ dated July 1, 2003 (Work Order 700007-G).
4. Pacific Soils Engineering, Inc., 2001, Preliminary Geotechnical Study, Tentative Tract
29798, Wolf Creek Specific Plan, City of Temecula, Califomia, dated March 21, 2003 (Work
Order 400622).
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PACIFIC 301L5 ENOINEERING, INC.
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APPENDIX B
Tables I and II
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Work Order 700007-G Page B-1
November 5, 2004
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TABLE I
• Optimum Maximum Laboratory
Moisture Content Dry Density
Soil Tvpe & Description (%) (pc11
C1 Dazk Brown Silty Sand 9.4 129.2
C2 Brown Silty Sand 10.1 126.5
~ D2 Red Brown Silty Sand 7.6 132.7
L1 Brown Silty Sand 10.9 125.1
Q1 Brown Silty Sand 7.1 1323
Ul Light Brown Silty Sand 8.0 129.9
V 1 Brown Silty Sand 8.2 129.2
Wl Brown Silty Sand 9.0 129.0
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Y Dark Brown Silty Sand 10.0 128.4
Legend
Non-designated test indicates test in compacted fill
~ -FG indicates finish grade test
-R, -R2, etc. indicates Retest of failed areas
Test Tvae
• SC - Indicates compaction test by sand cone method
N- Indicates in-situ density and moisture content tests were conducted using a
Campbell Pacific Nuclear Testing Gauge.
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PAGIFIC SOIL6 ENGINEEFi1NG, INC.
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Work Order 700007-G
November 5, 2004
Page B-13
~ ~ TABLE II -
'Maaimum Dept6 of Fill and Seismic Soil Profile Type -
Tract
Number
Lot
Number Approaimate
Maximum
Depth of Fill
Seismic Soil
Profile Type
Tract
Number
~~
Number Approximate
Maximum
Dept6 otFill Seismic Soil
Profile
Type
29798-F 1 6.0 Sp 29798-F 34 6.5 Sp
29798-F 2 7.5 Sp 29798-F 35 6.5 Sp
29798-F 3 8.5 Sp 29798-F 36 5.5 Sp
29798-F 4 10.0 Sp 29798-F 37 5.5 Sp
29798-F 5 10.0 Sp 29798-F 38 5.5 So
29'198-F 6 6.0 Sp 29798-F 39 5.5 Sp
29798-F 7 6.0 Sp 29798-F 40 6.0 Sp
29798-F 8 6.0 Sp 29798-F 41 5.5 Sp
29798-F 9 6.0 Sp 29798-F 42 5.5 Sp
29798-F ]0 6.0 Sp 29J98-F 43 5.5 Sp
29798-F I1 11.0 Sp 29798-F 44 5.5 Sp
29798-F 12 12.0 Sp 29798-F 45 6.5 Sp
29798-F 13 12.0 Sp 29798-F 46 6.5 Sp
29798-F 14 12.0 Sp 29798-F 47 6.0 Sp
29798-F 15 12.0 Sp 29798-F 48 6.5 Sp
29798-F 16 ]0.0 Sp 29798-F 49 7.0 Sp
29798-F 17 9.0 Sp 29798-F 50 6.0 Sp
29798-F IS 9.0 Sp 29798-F 51 5.0 Sp
29798-F 19 8.0 Sp 29798-F 52 5.5 So
29798-F 20 8.0 Sp 29798-F 53 5.5 Sp
29798-F 21 7.0 Sp 29798-F 54 6.0 Sp
29798-F 22 8.0 Sp 29798-F 55 5.5 Sp
29798-F 23 8.0 Sp 29798-F 56 5.5 So
29798-F 24 8.5 Sp 29798-F 57 5.5 Sp
29798-F 25 7.5 Sp 29798-F 58 6.0 Sp
29798-F 26 7.0 Sp 29798-F 59 6.5 Sp
29798-F 27 7.0 Sp 29798-F 64 6.5 Sp
29798-F 28 6.5 SD 29798-F 61 6.0 Sp
29798-F 29 6.0 Sp 29798-F 6z 6.0 Sp
29798-F 3~ 5.5 Sp 29798-F 63 6.0 SD
29798-F 3~ 5.0 So 29798-F 64 6.5 So
29798-F 32 6.5 So 29798-F 65 6.0 Sp
29798-F 33 5.5 So 29798-F 66 7.0 Sp
PACIFIC 501L5 ENGtNEEF1ING, INC.
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Work Order 700007-G
November 5, 2004
Page B-14
.-` - ..: , _ TABLE II . '
~ Maximum Depth of Fill and Seismic Soil Profile Type
Tract
Number
Lot
Number Approaimate
Maaimum
Depth of FiIL
Seismic Soil
profile Type
Tract
Number
~t
Number Approximate
Maaimuro
Depth of Fill Seismic Soil
Profile
Type
29798-F 67 5.5 SD 29798-F '1z 6.0 Sp
29798-F 68 5.5 Sp 29798-F 73 6.0 Sp
29798-F 69 6.0 Sp 29798-F 74 6.0 Sp
29798-F 10 6.0 Sp 29798-F 75 6.0 So
29798-F 71 6.5 So 29798-F 76 6.0 So
PACIFIC SOILS ENGINEERiNG~ INC.
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APPENDIX C
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Homeowner Maintenance &
Improvement Considerations
PACIFIC SOILS ENGINEEFi1NG, INC.
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Work Order 700007-G Page C-1
~ November 5, 2004
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HOMEOWNER MAINTENANCE AND IMPROVEMENT CONSIDERATIONS
General
•
Homeowners purchasing property must assume a certain degree of responsibility for homeowner
improvements and for maintaining conditions around their home. Maintaining drainage patterns
and minimizing the soil moisture variation below all lot improvements aze of primary
~ importance. Such design, construction and homeowner maintenance provisions may include:
- Employing contractors for homeowner improvements who design and build in recognition of
local building codes and specific site soils conditions.
~ - Establishing and maintaining positive drainage away from all foundations, walkways,
driveways, patios, and other hardscape improvements.
- Avoiding the construction of planters adjacent to structural improvements. Altematively,
planter sides/bottoms can be sealed with an impermeable membrane and drained away from
the improvements via subdrains into approved disposal areas.
•
- Sealing and maintaining construction/control joints within concrete slabs and walkways to
reduce the potential for moisture infiltration into the subgrade soils.
- Utilizing landscaping schemes with vegetation that requires minimal watering. Watering
should be done in a uniform manner, as equally as possible on all sides of the foundation,
keeping the soil "moisY' but not allowing the soil to become saturated.
- Maintaining positive drainage away from structures and providing roof gutters on all
structures with downspouts that are designed to carry roof runoff directly into azea drains or
dischazged well away from the foundation areas.
- Avoiding the placement of trees closer to the proposed structures than a distance of one-half
the mature height of the tree.
- Observation of the soil conditions azound the perimeter of the struchue during extremely
hoddry or unusually wet weather conditions so that modifications can be made in irrigation
programs to maintain relatively uniform moisture conditions.
Su(fates
Homeowners should be cautioned against the import and use of certain inorganic fertilizers, soil
amendments, and/or other soils from offsite sources in the absence of specific information
relating to their chemical composition. Some fertilizers have been known to leach sulfate
~~
PAGIFIC 501L5 ENGINEERING, INC.
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Work Order 700007-G Page C-2
November 5, 2004
•
compounds into soils otherwise containing "negligible" sulfate concentrations and increase the
sulfate concentrations to potentially detrimental levels. In some cases, concrete improvements
constructed in soils containing high levels of soluble sulfates may be affected by crystalline
•
growth or mineral accumulation, which may, in the long term, result in deterioration and loss of
strength.
~ Site Drainaee
- The homeowners should be made aware of the potential problems that may develop when
drainage is altered through construction of retaining walls, swimming pools, paved
walkways, patios or other hazdscape improvements. Ponded water, drainage over the slope
face, leaking irrigation systems, overwatering or other conditions which could lead to ground
~ saturation must be avoided.
- No water should be allowed to flow over the slopes. No alteration of pad gradients should be
allowed that would prevent pad and roof runoff from being directed to approved disposal
areas.
• - As part of site maintenance by the resident, all roof and pad drainage should be directed
away from slopes and around structures to approved disposal azeas. All berms were
constructed and compacted as part of fine grading and should be maintained by the resident.
Drainage pattems have been established at the time of the fine grading should be maintained
throughout the life of the structure. No alterations to these drainage patterns should be made
~ unless designed by qualified professionals in compliance with local code requirements and
site-specific soils conditions.
Sloae Draina¢e
~ - Residents should be made awaze of the importance of maintaining and cleaning all
interceptor ditches, drainage tenaces, downdrains, and any other drainage devices, which
have been installed to promote slope stability.
- Subsurface drainage pipe outlets may protrude through slope surfaces and/or wall faces.
These pipes, in conjunction with the graded features, are essential to slope and wall stabiliry
and must be protected in-place. They should not be altered or damaged in any way.
Plantin~ and Irrieation of Sloaes
- Seeding and planting of the slopes should be planned to achieve, as rapidly as possible, a
well-established and deep-rooted vegetal cover requiring minimal watering.
PACIFIC SOiL6 ENGINEERING, INC. ~~
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Work Order700007-G
November 5, 2004
Page C-3
- It is the responsibility of the landscape architect to provide such plants initially and of the
residents to maintain such planting. Alteration of such a planting scheme is at the residenYs
risk.
~ - The resident is responsible for proper irrigation and for maintenance and repair of properly
installed inigation systems. Leaks should be fixed immediately.
- Sprinklers should be adjusted to provide maximum uniform coverage with a minimum of
' water usage and overlap. Overwatering with consequent wasteful runoff and serious ground
~ saturation must be avoided.
- If automatic sprinkler systems are installed, their use must be adjusted to account for
seasonal and natural rainfall conditions.
~ Burrowin¢ Animals
- Residents must undertake a program to eliminate burrowing animals. This must be an
ongoing program in order to promote slope stability.
Homeowner Improvement
•
Homeowner improvements (pools, spas, patio slabs, retaining walls, planters, etc.) should be
designed to account for the terrain of the project, as well as expansive soil conditions and
chemical characteristics. Design considerations on any given lot may need to include provisions
~ for differential bearing materials, ascending/descending slope conditions, bedrock structure,
perched (irrigation) water, special geologic surcharge loading conditions, expansive soi] stresses,
and long-term creeplsettlement.
• All homeowner improvements should be designed and constructed by qualified professionals
utilizing appropriate design methodologies, which account for the on-site soils and geologic
conditions. Each lot and proposed improvement should be evaluated on an individual basis.
~ Setback Zones
Fill slopes have been manufactured on site to masimum heights of approximately five (5) feet.
Manufactured slopes may be subject to long-term settlement and creep that can manifest itself in
the form of both horizontal and vertical movement. These movements typically aze produced as
a result of weathering, erosion, gravity forces, and other natural phenomenon. A setback
adjacent to slopes is required by most building codes, including the Uniform Building Code.
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PACIFIC SOILS ENGINEEFIING, INC.
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Work Order700007-G
November 5, 2004
Page C-4
This zone is intended to locate and support the residential structures away from these slopes and
onto soils that are not subject to the potential adverse effects of these natural phenomena.
~~ The homeowner may wish to construct patios, walls, walkways, planters, swimming pools, spas,
etc. within this zone. Such facilities may be sensitive to settlement and creep and should not be
constructed within the setback zone unless properly engineered. It is suggested that a
professional engineer who is familiar with hillside grading ordinances and design and
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construction requirements associated with hillside conditions design pians for such
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improvements. In addition, we recommend that the designer and contractor familiarize
themselves with the site specific geologic and geotechnical conditions on the specific lot.
Excavation Characteristics
Excavation of on site materials did not require heavy ripping or blasting for efficient excavation
and fill placement. Fill placed during grading of the subject lots consisted of soil comprised
predominantly of silty sand with some clay and gravel. Minor amounts of cobbles up to 4-inches
in diameter were also encountered.
• PACIFIG SOILS EN6INEEFING, INC. ~~