HomeMy WebLinkAboutProject Grading Reporti•
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a PACIFIC SOILS ENGINEERING, INC.
710 E. PARKRIDGE AVENUE, SUITE 105, GORONA, GA 92879
TELEPHONE: (909) 582-0170, FAX: (909) 582-0176
STANDARD PACIFIC HOMES
255 East Rincon Street, Suite 200
Corona, California 92879-1330
Attention: Mr. Adam Smith
Subject: PROJECT GRADING REPORT,
Lots 1 through 47, Tract No. 29798-9
Wolf Creek Project, City of Temecula,
County of Riverside, California
References: See Appendix A
Gentlemen:
October 27, 2004 . ~
Work Order 700007-G
Presented herein is a summary of Pacific Soils Engineering, Inc.'s (PSE) observations and test
results pertaining to the completion of rough grading of Lots 1 through 47 of Tract 29798-9,
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 plan (Sheet 14 of 23) prepared by Lohr and Associates has been
used as a base for this report, and has been designated as Plate 1 for the purposes of this report.
Plate 1 depicts the approximate locations of the compaction tests conducted during rough
grading operations, the geologic information, and the removal bottom elevations. Also presented
herein aze 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 reports. 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.
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PORATEHEADOUARTERS LOSANGELES COUNTV SOUTH ORANGE COUNTV SAN DIEGO COUNTV
TEL ~714)220-0]]0 TEL (310)325-~2~2 or~323)I75-6771 TEL:~714)]30-2122 TEL:(858)560-1713
FA%:~714)220-9589 FAX:(714)220-9589 FAX: Qt4)730-5191 FA%:(858)560-0380
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Work Order 700007-G
October 27, 2004
. Page 2
1.0 ENGINEERING GEOLOGY
1.1 Geoloaic 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 Plate 1.
, ~ 1.11 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 (Man Svmbol Oap
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 aze shown on the enclosed plans.
1.2 Groundwater
~ Groundwater was not encountered during this phase of grading.
1.3 Shucture
The alluvium was observed to be essentially flat lying. No faults or joints were
observed during this phase of grading.
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1.4 Conclusions
From an engineering geologic viewpoint, Lots 1 through 47 of Tract 29798-9 in
the City of Temecula, California aze suitable for their intended residential use.
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2.0 SOIL ENGINEEffiNG
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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PAGIFtC SOILS ENGINEERING, ING.
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Work Order 700007-G
October 27, 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 and
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replaced as compacted fill prior to fill placement. The approximate removal
bottom elevations shown on the enclosed plans (Plate 1) was obtained by the
grading contractor personnel utilizing a laser and survey control points provided
• by the Civil Engineer.
2.2 Treatment of Removal Bottoms
Prior to compacted fill placement, the exposed surfaces at the bottom of removals
~ were scarified, moisture conditioned to near optimum moisture content, and
compacted in-place to a minimum 90 percent of the laboratory maximum density
(ASTM D 1557).
2.3 Compacted Fill Placement
Fil] consisting of the soil types indicated in Table I(Appendix B) was placed in
thin lifts (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 similaz 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 (Plate 1). 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 SOILS ENGINEERING, INC.
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Work Order 700007-G
October 27, 2004
Page 4
2.5 Deuth of Fill
Compaction testing was performed approximately for each one (1) to two (2) feet
of fill placed. The approximate maximum vertica] depth of fill placed during
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grading, within the limits of this report, is on the order of nine (9) feet in the
vicinity of Lots 9-11, 35, and 37. 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 portions of cuUfill transition lots were overexcavated a minimum of five
(5) feet and replaced with compacted fill. Table 2.1 presents a summary of the
cut/fill transition lots.
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TasiE`z.i .
Cut/Fill Transition Lots Overexcavated and
Replaced with Compacted Fill
~ 29798-9 I 1, 12, 18-20, 24-28, 35-37 ~
~ 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.
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~ TABLE 2.2
Design Cut Lots Overexcavated and Replaced with Compacted Fill
Tract Lot #
29798-9 21-23,38-47
2.8 Fill Sloaes
Fill slopes were ove~lled approximately 5 feet, measured horizontally. The
~ slope was then trimmed back to the compacted core upon completion of grading.
Finish slope sarfaces have been probed and/or tested and are considered to satisfy
the project requirements and the grading codes of the City of Temecula.
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I• PAGIFIC SOILS ENGINEERING, INC.
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Work Order 70000?-G
October 27, 2004
Page 5
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
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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
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 aze not
~ currently available since individual planning areas are to be sold to various merchant
builders. Unless unusual sitings, configurations, or loading conditions are proposed, it is
likely that structures can be supported on post-tensioned slab/foundation systems.
Recommendations for the design of foundations should be made based upon specific
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structural sitings and loading conditions, when available.
Bulk samples were collected during grading and neaz finish surface and representative
• samples were subjected to a series of tests in order to chazacterize the neaz-surface soil
characteristics. In addition to determining the laboratory maximum dry density and
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
provided by the engineer of record based upon review of specific plans for proposed
improvements.
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PACIFIC SOILS ENOINEEFiING, INC.
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Work Order 700007-G
October 27, 2004
Page 6
TABLE3-1
$ummary of Hydrometer, Eapansioqlndea Sulfate Content Testing
Sample Expansion Eapansion Hydrometer Analyses Chemical
Lot #'s Indea Potential Gravel Saud Silt Clay Sulfate Content (%
wei ht
1-3 14 Ve Low 0 48 35 17 0.009
4-6 9 Ve Low 0 49 34 17 0.006
7-9 0 Ve Low 0 57 28 15 0.009
10-11 1 Ve Low 0 52 30 IS 0.004
12 8 Ve Low 0 50 26 24 0.003
13-14 0 Ve Low 0 57 26 17 0.003
15-17 0 Very Low 0 65 24 11 0.005
18-20 15 Ve Low 0 52 30 18 0.007
21-23 4 Ve Low 0 53 30 17 0.026
24-26 0 Ve Low 0 68 23 9 0.009
27-29 18 Ve Low 0 47 34 19 0.053
30-32 0 Ve Low 0 77 16 7 0.001
33-35 5 Ve Low 0 51 30 19 OA17
36-37 3 Ve Low 0 57 26 17 0.007
38-40 0 Ve Low 0 67 23 ]0 0.019
41-43 11 Ve Low 0 52 31 17 0.013
44-47 16 Very Low 0 46 33 21 0.011
4.0 UTILITY TRENCH EXCAVATION & BACKFILL
All utility trenches should be shored or laid back in accordance with applicable OSHA
~ standards. Mainline and lateral utility trench backfill should be compacted to at least 90
percent of maximum laboratory dry density as determined by AST'M Test Method: D-
1557. On-site soils may not be suitable for use as bedding material but will be suitable
s 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 inigation. 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 terraces, down drains and
~ other devices that have been installed to promote structwe and slope stability.
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PACIFIC SOILS ENGINEERING, INC.
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Work Order 700007-G Page 7
October 27, 2004
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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
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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.
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Design fine grade elevations should be maintained through the life of ttte structure. If
design fine grade elevations are altered, adequate azea drains should be installed in order
to provide rapid discharge of water, away from the structure.
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The resident or owner is responsible for proper irrigation and for maintenance and repair
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 aze 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 chazacteristics and soluble sulfate concentrations.
In addition, certain lots contain manufactured slopes within or adjacent to the building
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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
• information to educate the homeowners regazding 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.
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PACIFIC SOILB ENGINEERING, INC.
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Work Order700007-G
October 27, 2004
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Page 8
This report presents information and data relative to the mass grading and/or
placement of compacted fill at the subject site. A representative(s) of this firm
conducted periodic tests and observations during the progress of the construction in
au effort to determine whether compliance with the project drawings, specifications,
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.
Techuical advice and suggestions were provided to the owuer and/or his
representative based upon the results of the tests and observations. Completed
work under the purview of this report is considered suitable for the intended use.
Conditions of the reference reports remain applicable unless speciTically superseded
herein.
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.
Respectfully submitted,
PACIFIC OILS EN INE ,RING, INC. Reviewed by:
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By: -
SC A. GRAY 9 A ES B. C S/RGE 192
Reg. Exp.: 12-31-04 ~m
QEtOFESSlp RC 30280/Reg. Exp.: 3-31-06
Registered Civil Engi oSj A ~~ C ie peratio s Off r
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W No.87391 m
Distribution: (6) Addressee ~ ~, ~ m
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SAG:IBC:DCA:bjb-700007-G * ~ z~, zooa T~~~ -* EAN C. ARMSTRONG/CEG
T9~~~L~OQ~P Reg. Exp.: 9-30-06
~ Vice President
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6~p.3/31/06
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PAGIFIC SOILS ENGINEERING, ING.
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APPENDIX A
References
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PACIFIC SOILS ENOINEERING, ING.
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Work Order700007-G
October 27, 2004
APPENDIX A
Page A-1
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 Pazameters, Tract No. 29798, Wolf
~ Creek Specific Plan, City of Temecula, California, dated December l, 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 Mazch 21, 2003 (Work
Order 400622).
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PACIFIC SOILS ENGINEERING, INC.
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APPENDIX B
Tables I and II
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PACIFIG SOIlS ENGINEERING, ING.
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Work Order 700007-G
October 27, 2004
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TABLEI
Page B-1
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' Optimum Maximum Laboratory
Moisture Content Dry Density
Soil Tvae & Description (%) (acfl
C 1 Dark Brown Silty Sand 9.4 129.2
C2 Brown Silty Sand 10.1 126.5
~ L1 Brown Silty Sand 10.0 128.4
U1 Light Brown Silty Sand 8.0 129.9
V1 Brown Silty Sand 8.2 129.2
Leaend
Non-designated test indicates test in compacted fill
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-FG indicates finish grade test
-R, -R2, etc. indicates Retest of failed azeas
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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PACIFIC BOILS ENGINEERING, INC.
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Work Order 700007-G
October 27, 2004
Page B-8
. , TABLE'II ~
-_ Maximum Depth of Fill and Seismic Soil Profile Type
Tract
Number
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Number Approaimate
~aximum
Depth ot Fill
Seismic Soil
profle Type
Tract
Number
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Number Approximate
Maximum
Depth oiFill Seismic Soil
Profile
Type
29798-9 1 6.0 Sp 29798-9 25 7.0 Sp
29798-9 2 6.5 Sp 29798-9 26 7.0 So
29798-9 3 7.5 Sp 29798-9 27 7.5 So
29798-9 4 7.5 SD 29798-9 28 7.5 Sp
29798-9 5 8.5 SD 29798-9 29 7.5 Sp
29798-9 6 8.5 So 29798-9 30 7.0 Sp
29798-9 7 8.5 Sp 29798-9 31 7.5 Sp
29798-9 8 8.5 Sp 29798-9 32 8.0 SD
29798-9 9 9.0 Sp 29798-9 33 8.0 Sp
29798-9 10 9.0 SD 29798-9 34 8.5 Sp
29798-9 11 9.0 So 29798-9 35 9.0 Sp
29798-9 12 5.5 Sp 29798-9 36 8.5 Sp
29798-9 13 6.5 Sp 29798-9 37 9.0 So
29798-9 14 7.0 Sp 29798-9 38 6.0 Sp
29798-9 15 7.0 Sp 29798-9 39 5.5 Sp
29798-9 16 6.5 So 29798-9 40 6.0 Sp
29798-9 17 6.5 So 29798-9 41 6.0 Sp
29798-9 18 6.0 Sp 29798-9 42 6.5 Sp
29798-9 19 6.0 Sp 29798-9 43 6.5 So
29798-9 20 6.0 Sp 29798-9 44 7.5 Sp
29798-9 21 6.0 So 29798-9 45 7.0 So
29798-9 22 5.5 Sp 29798-9 46 5.5 Sp
29798-9 23 5.5 Sp 29798-9 47 5.0 Sp
29798-9 24 7.0 Sp
V~ V
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APPENDIX C
Homeowner Maintenance &
Improvement Considerations
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Work Order 700007-G Page C-1
October 27, 2004
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I HOMEOWNER MAINTENANCE AND IMPROVEMENT CONSIDERATIONS
General
~ Homeowners purchasing property must assume a certain degree of responsibility for homeowner
improvements and for maintaining conditions azound 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 homeow~er 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 hazdscape 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 azeas.
~ - Sealing and maintaining construction/controljoints 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 "moist" 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 azeas.
~ - Avoiding the placement of trees closer to the proposed struchues than a distance of one-half
the mahue height of the tree.
- Observation of the soil conditions around the perimeter of the structure during extremely
hot/dry or unusually wet weather conditions so that modifications can be made in irrigation
programs to maintain relatively uniform moishxre conditions.
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Sulfates
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
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PACIFIC SOILS ENGINEERING, INC.
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Work Order 700007-G
October 27, 2004
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Page G2
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 Draina¢e
- The homeowners should be made aware of the potential problems that may develop when
drainage is altered thtough construction of retaining walls, swimming pools, paved
walkways, patios or other hardscape 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
azeas.
• - As part of site maintenance by the resident, all roof and pad drainage shou~d be directed
away from slopes and around struchues to approved disposal azeas. All berms were
constructed and compacted as part of fine grading and should be maintained by the resident.
Drainage patterns have been established at the time of the fine grading should be maintained
throughout the life of the structure. No alterations to these drainage pattems should be made
~ unless designed by qualified professionals in compliance with local code requirements and
site-specific soils conditions.
Slope Draiuaee
~ - Residents should be made aware of the importance of maintaining and cleaning all
interceptor ditches, drainage terraces, 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, aze essential to slope and wall stability
• and must be protected in-place. They should not be altered or damaged in any way.
Plantin¢ and Irrieatiou of Slopes
- 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.
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PACIFIC SOILS ENGINEERING, INC.
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Work Order700007-G
October 27, 2004
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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 resident's
risk.
II ~ - The resident is responsible for proper irrigation and for maintenance and repair of properly
installed irrigation systems. Leaks should be fixed immediately.
- Sprinklers should be adjusted to provide maacimum 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.
Burrowine 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 chazacteristics. Design considerations on any given lot may need to include provisions
~ for differential bearing materials, ascending/descending slope conditions, bedrock structure,
I perched (inigation) water, special geologic surcharge loading conditions, expansive soil stresses,
and long-term creep/settlement.
~ 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 ma~cimum 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 are 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 ENGINEERING, INC.
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Work Order 700007-G
October 27, 2004
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Page C-4
This zone is intended to locate and support the residential structures away from these slopes and
onto soils that aze not subject to the potential adverse effects of these natural phenomena.
I~ The homeowner may wish to consUuct 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 familiaz with hillside grading ordinances and design and
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construction requirements associated with hillside conditions design plans for such
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 soi] comprised
predominantly of silty sand with some clay and gravel. Minor amounts of cobbles up to 4-inches
in diameter were also encountered.
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PACIFIC SOILS ENGINEELi1NG. INC.