PUBLIC WORKS ENGINEERING DEPARTMENT
- Signature and professional registration number of project Geotechnical
Engineer (G.E.) or Registered Civil Engineer (R.C.E.);
- Job Address.
- Location description and/or location index map with north arrow, bar
- Description of
site conditions including topography, relief, vegetation index
map with north arrow, ban, man-made features, drainage and watershed;
- Proposed grading including general scope, amount, special equipment
and/or methods if applicable;
- Planned construction including type of structure and use, type of
construction and foundation/floor system, number of stories.
B. FIELD INVESTIGATION
- Scope of work including date of work, investigative methods, logs
of exploratory excavations, and real or assumed elevation of exploratory
excavations for reference of soil materials and samples to finished
grade or footing elevations.
- Plan with legend including site limits, terrain features, man-made
features, locations of exploratory excavations, soil of formational
contacts, proposed improvements (including slopes with ratios, daylight
lines, paving areas, retaining/crib walls, subdrains, over-excavation/cleanout/uncompacted
- Location of all
surface and subsurface soil samples collected.
- Ground water conditions and potential for future natural or artificial
ENGINEERING/MATERIAL CHARACTERISTICS AND TESTING
- Test methods used, type or condition of samples, applicable engineering
graphics, results of all tests, and locations of all test samples.
- Unified soil classification of materials.
- Material competency and strength
- Field densities and moisture content, as well as relative compactions
- Shear strength parameters of foundation material (drained or undrained
conditions, effective stress or total stress analysis). In-situ or
remolded samples must be identified.
- Consolidation or settlement potential.
- Maximum dry density/optimum moisture parameters as determined by ASTM
FOUNDATION DESIGN CRITERIA
(Contact Building Department for additional requirements.)
- Footing depth,
width, design and placement;
- Criteria for foundation
- Allowable bearing
values based on testing;
- Lateral pressures
(active, passive, or at-rest conditions) and coefficient or friction;
- Settlement - total,
differential and rate of settlement;
- Footing design
and placement criteria;
All general and site-specific
materials reviewed in conjunction with the report preparation should be
referenced in the report.
CONCLUSIONS AND RECOMMENDATIONS
- Ground preparation, including recommendations regarding clearing unsuitable
material removal, scarification and moisture conditioning.
- Suitability of in-situ soil materials to support fill and/or structures.
Describe requirements to be used to determine soil suitability. Also
describe densification and moisturization or dewatering measures, including
equipment, surcharge, settlement monitoring, etc., as appropriate.
- Placement of structural fill:
- Suitability of on site and imported soils for use in compacted fill.
- Methods of ASTM standards to be used in fill compaction.
- Testing methods and procedures to be used, including frequency of
field density testing b vertical intervals and/or volume of fill.
- Minimum recommended percent relative compaction for mass graded
- Recommendations for treatment of cut/fill lines or other differential
transitions beneath improvements.
- Backfill specifications and specific recommendations for compaction
of utility trenches, slope faces, landscape areas, and other structural
and nonstructural areas.
- Provisions for final observations and necessary testing during and
subsequent to grading.
- Assessment as to the adequacy of the site for the proposed development.
- Any other geotechnical information pertinent to the development of
soils report shall include the following information and any additional
information or investigation required by the City Engineer.
- Signature and professional number of the Certified Engineering Geologist
(C.E.G.) under which the work was performed, date report was signed,
company name, mailing address and phone number.
- The Tentative Map number, street address or any information to help
locate the project area, as available.
- Site description, which should include comments addressing the following:
- Topography vegetation and size of the subject area.
- General setting with respect to geologic, geomorphic and geographic
features present in the surrounding area.
- Location map and site map with scale and north arrow.
- Location and condition of any existing structures and/or improvements,
including drainage controls.
- Purpose of the report, i.e., development proposed (including the
proposed land use), sale of real estate, required by City Engineer,
- A review of pertinent site specific and general geotechnical literature
should be performed, as should a review of site specific aerial photographs.
A listing of references reviewed should be included with the report.
(when applicable) should be on a topographic base and should include:
- Location map,bar
scale, north arrow, legend, any geographic features which can be identified
in the field, etc.;
- Geographic features
that may be present such as; formational contacts, faults, folds, anticlines,
synclines, domes, joints, fractures, lineaments, terraces, etc. The
accompanying report should include an evaluation of how these features
may impact the anticipated use;
- General limited of existing fields, as indicated by visual observation.
should address significant factors which could affect the site. Items
to consider are the following:
- Geologic description
of all units observed on the site.
- Relative age, and
correlation with named formations.
- Attitudes and distribution of the units as they are exposed in the
area (not necessarily confined to the report area if significant geologic
features are present nearby).
- Structural features
affecting the report area.
- Surficial (unconsolidated) deposits, both artificial and naturals.
Distribution, relative age, identification and description of these
- Landslides and
- Sufficient geologic mapping of the area to comment on anticipated
ground water conditions that may affect the sit and/or project.
- Location of any
observed seeps or springs.
- Effects of grading
on infiltration of water into cut and fill areas.
- Discussion of the
effects of possible subsurface flow along the natural drainage courses
proposed for filling.
conditions should be stated and a general overview of the site geology
as it correlates to the feasibility of the proposed project should be
presented. An assessment of the degree of hazard present, based on existing
information, should be given. If there are suspected geologic problems
that cannot be evaluated except through in depth investigation, then this
should be clearly stated in the report. No engineering design recommendations
for the proposed development should appear in this type of report. Please
note that if the geological reconnaissance report recommends further investigation,
the recommended investigation must be performed before the City will accept
to the Preliminary Report, as As-Graded Soils Report is always required
for hillside grading. It shall be the responsibility of the Civil Engineer
who prepares the grading plans to incorporate all recommendations of the
preliminary report into the grading plans. The Civil Engineer shall also
be responsible for the preparations of revised grading plans and for as-graded
grading plans upon completion of the work. Further, the Civil Engineer
shall have the responsibility for certifying the finished grading with
respect to line and grade.
operations undertaken pursuant to the approved grading plan shall be subject
to geotechnical observation and testing by the Geotechnical Engineer or
a Registered Civil Engineer and, when geologic conditions so dictate,
by a Certified Geologist, who shall have the responsibility to report
whether, in their professional opinion, the grading operations were performed
in compliance with the geotechnical requirements of the grading plans
and specification. After completion of the grading operations, the Registered
Civil Engineer or Geotechnical Engineer and/or Engineering Geologist shall
submit his reports, compaction test data, and the geotechnical engineering/geology
recommendations of the Civil Engineer in the form of As-Graded report.
The report shall include the following information:
- Signature(s) and
professional number (s) of person of the same level of registration
or certification as the parties signing the preliminary report.
- Job address, lot
and map number.
- Grading plan number.
PLACEMENT OF FILL
- Purpose for which
fill was place.
- Preparation of
natural grade to receive fill.
- Placement of fill
(depth of fill, watering, etc.).
- Equipment used
- Method of compaction
for outer slope area.
- Test procedure (field and laboratory).
- Plot plan graphically depicting the location of all density tests.
The plan should be of sufficient size to be reviewable.
- Summary of test results:
- Test identification number;
- Date test performed;
- Maximum dry density test;
- Optimum moisture;
- Field dry density;
- Field moisture;
- Relative compaction;
- Approximate elevation of test;
- Approximate finish grade elevation at test site.
TESTING (UTILITY TRENCH COMPACTION)
- Location of test;
- Depth of test;
- Method of backfill
- Summary of test
- Summary of expansion
test results (identify lots or areas with swelling potential);
- Summary of chemical
test results, as required;
- Summary of corrosion
test results, as required.
- Fertility reports:
Results of agricultural suitability and fertility analysis to support
plant life. (for slope areas only)
- Plot plan showing limits of the compacted area (approximate pad elevation,
depth of fill, areas of over-excavation, keys and subdrains). If slope
failures occurred during construction, the limits of these failed areas
should be shown on the plan;
- Treatment of "daylight"
or cut/fill transition zones (extent of over-excavation outside of footing);
- Type of soil encountered during grading (fill, in-situ, imported borrow);
- Ground water conditions
identified and subdrains or other methods used to mitigate adverse effects.
- Geologic conditions encountered, including geologic contacts, structural
attitudes, marker beds, faults, and bedding plan shears. Geologic data
should be included in areas mapped as fill and in buttress excavations;
- Comments on changes made during grading and their effect on the recommendations
and in the geotechnical report;
- Exploratory borings
and trenches performed during grading should be located on the maps
attached to the report, and logs of these excavations should be included
in the report;
- Locations of instrumentation at the site, including settlement monuments,
extensometers, piezometers, inclinometer, etc., should be plotted on
the maps attached to the report. Results of instrument readings should
be included in the report;
- Elevations at the
bottoms of cleanouts, keyways, or other excavations.
RECOMMENDATIONS AND OPINIONS
- Footing recommendations
and bearing value on compacted fill;
- Footing and floor
slab recommendations (Contact Buidling Department for their requirements);
- Statement as to
the suitability of natural soil to support the fill or structure;
- Statement as to the adequacy of the sit for the intended use,, as
affected by soil engendering and/or geologic factors;
- Statement as to the gross and surficial stability of all slopes.
Cross sections prepared during grading for stability calculations should
be included in the report, as well as a description of the calculations
method, summary of calculation results, and conclusions;
- A statement addressing whether the soil engineering and engineering
geologic aspects of the grading are in compliance with the applicable
conditions of the grading permit and the geotechnical engineer's and
engineering geologist's recommendations;
- Statement as to
the plant life over the slopes.
- Statement as to
the approval and the field inspection during the construction of all
crib walls, and the stability of overall slopes with the crib wall in
operations for which a permit is required shall be subject to periodic
inspection by the City Engineer. The City engineer shall inspect the project
at the various stages of work requiring approval and at more frequent
intervals as necessary to determine that adequate control of the earthwork
operations is being provided by the Geotehcnical Engineer/Engineering
the course of fulfilling their responsibilities under Title 17.06, the
Geotechnical Engineer/Engineering geologist or the civil Engineer find
that the grading work is not being done in conformance with the approved
grading plans, discrepancies shall be reported immediately in writing
to the owner, the contractor and the City Engineer. Recommendations by
the Geotechnical Engineer/Engineering Geologist for corrective measures,
along with a report of findings, shall be submitted as construction change
drawings to the owner and to the City Engineer. All changes from the originally
approved grading plan shall be reflected in the As-Graded Report and on
the As-Graded Grading Plan.