HomeMy WebLinkAbout20200909113038027 (14)DIAMOND BAR EAST PARTNERS
HGEI Project No. 91-02-0109a-27
December 18, 1996
Page 2
2. The graded descending slope at the rear of the property is part of a stabilization fill that
was constructed in order to increase the stability of the slope. No significant grading of
this slope is proposed.
3. Tests performed following the completion of rough grading indicted a low expansion
potential and, negligible water-soluble sulfate concentration for the surface/near-surface,
soils as defined by the Uniform Building Code.
4. Foundation and floor slab design criteria for a Type Il system presented in Table A of the
rough grading report (Ref. 2) are 'considered applicable to this lot.
5. Sulfate resistant concrete containing Type V cement is not considered necessary for this
lot (see Ref. 5).
6. A retaining wall is planned ,along the toe of the northerly ascending 2:1 (H:V), slope. The
setback of the residence from the 'retaining wall is at least 11 feet and meets the require-
ment of Section 1806, of the 1994 Uniform Building Code. This retaining wall may be
designed using the soil parameters and recommendations presented in the referenced
geotechnical report of rough grading (Ref. 2) and an equivalent active earth pressure of
45 pounds per square foot.per foot of depth.
7. The homeowner.should be informed that future grading to alter the slopes should not be
performed without review by a geotechnical consultant familiar with rough grading of the
tract. In addition, the homeowner should be informed of the importance of slope land-
scaping, maintenance and erosion control and should be provided with guidelines that
were appended to the referenced rough grading report (Appendix C Ref. 2) and the
standard recommendations (Ref. 4).
We trust that this letter/report is adequate for your current needs. if you have any questions or,
require further assistance, please call.
Very truly yours,
HARRINGTON GEOTECHNICAL ENGINEERING, INC.
Pre ared B Reviewed By: p y: F
st .
tanley Schweitzer, P E i y, Don P. Harrington;'Sr., P
SeniorGeotechnical Engines ` _ President
JSS/DPH:Id
Distribution: , Addressee (1)
R. Gould & Associates (1)
Pfeiler & Associates, Inca (4) Attn: Lynn Mutch
C:IDOCS\DBAR\PLANRV W \LOT27PRE.GRD
flarfincton
lrl8ineerifi& chnical
Inc.
May 12, 1995
Mr. Bernist Mazur
DIAMOND EAST PARTNERS
3480 Torrance Boulevard, Suite 300
Torrance, CA 90503
SUBJECT: Geotechnical Review of Precise Grading, Plot and Foundation Plans and
Building Sections for 2839 Bentley Way, Lot 28, Tract 47851, Crystal Ridge
Estates, Diamond Bar, California HGEI Project No 91-02-0109A-28
REFERENCES: 1) Plot Plan and Building Sections for the Subject Lot, Dated January
15, 1995, Prepared by R. Gould & Associates, Inc. & Timothy S.
Racisz, A.I.A.
2) Foundation Plan, Sheet 7, for the Subject Lot, Dated March 27,
1995, Prepared by R. Gould & Associates, Inc. & Timothy S. Racisz,
A.I.A.
3) "Geotechnical Report of Rough Grading for Lots 1-17 and 20-48,
Vesting Tentative Tract 47851, Diamond Bar, California," Dated
October 11, 1994, Prepared by HGEI, Project No. 91-02-0109A.
4) Rough Grading Plan, Sheets 1 thru 7, Tract 47851, Prepared by
Hunsaker & Associates, Inc.
5) Precise Grading Plan Drawing No. B-2188 for the Subject Lot,
Dated April 17, 1995, by Lanco Engineering.
Dear Mr. Mazur:
In response to a request from R. Gould & Associates, Inc., we have reviewed the
referenced precise grading plan, plot plan, foundation plan and building sections for Lot
28 of Tract 47851.
The referenced plans and sections were reviewed from a geotechnical standpoint for
conformance with our recommendations only. These plans and sections were not
reviewed as to the accuracy of dimensions, measurements, calculations or any non-
geotechnical portion of the design.
Batavia Business Center, 1938 North Batavia Street, Suite N, Orange, CA 92665 (714) 637-3093 - (800) 924-7645 - FAX (714) 637-3096
DIAMOND EAST PARTNERS
Project No. 91-02-0109A-28
May 12, 1995
Page 2
Based upon our review it appears that the referenced plans and sections are in general
conformance with our previous recommendations. During this review the following items
were noted:
Based upon the comparison of the pad elevation shown on the precise grading plan
with the as -graded elevation shown on the rough grading plan it appears that no
significant grading is planned as part of the lot development. Maximum depth of cut
or fill is approximately two feet for grading of the driveway.
2. No significant changes to the on -site or adjacent slopes are currently planned. The
homeowner should be informed that future grading to alter the slopes should not be
performed without review by a geotechnical consultant familiar with rough grading
of the tract. It should be noted that the adjacent westerly off -site slope is part of a
structural stabilization fill. In addition, the homeowner should be informed of the
importance of slope landscaping, maintenance and erosion control and should be
provided with guidelines that were appended to the referenced rough grading report
Appendix C).
3. Preliminary tests performed at the completion of rough grading indicate a low
expansion potential and negligible water-soluble sulfate concentration for the
surface/near-surface soils as defined by the Uniform Building Code.
4. Foundation and floor slab design recommendations for Type II as presented in
Table A of the rough grading report (Ref. 3) are considered applicable to this lot.
5. Sulfate resistant concrete, i.e. concrete containing Type V cement is currently
considered unnecessary for this lot. The concentration of water-soluble sulfate
should be confirmed by additional testing prior to any concrete placement.
Four copies of the precise grading plan have been stamped, signed and returned to R.
Gould & Associates for submittal to the City of Diamond Bar. One copy has been retained
for our records.
9
DIAMOND EAST PARTNERS
Project No. 91-02-0109A-28
May 12, 1995
Page 3
We trust that this letter/report is adequate for your current needs. If you have any
questions or require further assistance, please call.
Very truly yours,
HARRINGTON GEOTECHNICAL ENGINEERING, INC.
Distribution: Addressee (2)
R. Gould & Associates (3)
C:\DOCSIDBAR\PLANRVWILOT28PLN. RVW
