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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 2831 Bentley Way, Lot 30, Tract 47851, Crystal Ridge
Estates, Diamond Bar, California HGEI Project No. 91-02-0109A-30
REFERENCES: 1) Plot Plan and Building Section for the Subject Lot, Dated November
22, 1994, Prepared by R. Gould & Associates, Inc. & Timothy S.
Racisz, A.I.A.
2) Foundation Plan, Sheet 7, for the Subject Lot, Dated April 11, 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 B-2189 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 30 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-30
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:
The cut/fill contact line shown on the plot plan is from the rough grading plan and
due to over -excavation of the cut portion of the lot and capping with compacted fill
no longer applies to this lot.
2. 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 1.5 feet for the driveway.
3. 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. 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).
4. 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.
5. 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.
6. 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.
A a
DIAMOND EAST PARTNERS
Project No. 91-02-0109A-30
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.
Prepared By: Reviewed By:
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J. Stanley Schweitzer,'P ,#Don P. Harrington, Sr., P.E.
Senior Geotechnical Entloee ., President
Distribution: Addressee (2)
R. Gould & Associates (3)
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