HomeMy WebLinkAboutCDP 2018-0019; SNYDER RESIDENCE; RESPONSE TO THIRD PARTY GEOTECHNICAL REVIEW PROPOSED SINGLE FAMILY RESIDENCE; 2019-02-26EAST COUNTY SOIL CONSULTATION
AND ENGINEERING, INC.
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APR 2 5 2019
ED
10925 HARTLEY ROAD SUITE I
SANTEE CALIFORNIA 92071
619 258-7901
fax 619 258-7902
James M. Snyder
I 0612 Prospect A venue
Santee. California 92071
Subject: Response to City of Carlsbad Issues of Concern
Proposed Single-Family Residence
1781 Skimmer Court
Carlsbad, California 92011
LAND DE VELOPMENT
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February 26. 20 I 9
Project o. 18-l 127E5
Reference: "Limited Geotechnical Investigation, Proposed Single-Family Residence. 1781
Skimmer Court, Carlsbad, California 92011 ", Project No. I 8-1127E5, Prepared by
East County Soil Consultation and Engineering. Inc., Dated March I, 2018.
Dear Mr. Snyder:
In accordance with your request, we have reviewed the referenced geotechnical report to address
the City of Carlsbad issues of concern in their review of documents for the proposed single-
family residence at the subject site.
1. Based on an estimated R-value of 50 for the on-site soils and the assumed traffic indexes, the
following concrete pavement section is recommended for the proposed driveway, walkways and
patio at the subject site:
Location Traffic Index Pavement Section
Driveway 5.0 6" PCC on Compacted
Subgrade
Walkways and Patio 4.5 4" PCC on Compacted
Subgrade
The upper 12 inches of subgrade should be moisture-conditioned within 2 percent over optimum
and compacted to at least 95 percent relative compaction (ASTM D 1557). PCC pavement
should be a minimum of 3,500 psi concrete. It is recommended that steel reinforcement be
provided for PCC pavements which will be subject to heavy impact loading, such as trash and
fire trucks. Minimum reinforcement should consist of #3 deformed rebar placed at 18-inch
centers each way. Placement of concrete, control/ expansion joints, and any reinforcement
should be conformance with AC! specifications and the Structural Engineer's design.
CDP 2018-0019
James M. Snyder/ 1781 Skimmer Court/ Carlsbad Proj ect No. 18-l / 27£5
2. As presented in the referenced geotechnical report, we recommended overexcavation and
recompaction to a minimum depth of 2 feet below the bottom of the proposed footings (i.e. 3.5
feet) following clearing and grubbing, i.e the removal of vegetation and concrete waste from the
demolition of the remaining foundation and slab. The bottom of the excavation should be
scarified, moisture-conditioned within 2 percent above the optimum moisture content and
compacted to a minimum of 90 percent relative compaction (ASTM Dl 557 test method).
Compacted fills should consist of approved soil material, free of trash debris, roots, vegetation or
other deleterious materials. Fill soils should be compacted by suitable compaction equipment in
uniform loose lifts of 6 to 8 inches. Unless otherwise specified, all soils subjected to recompaction
should be moisture-conditioned within 2 percent over the optimum moisture content and
compacted to at least 90 percent relative compaction per ASTM test method DI 557.
If we can be of further assistance, please do not hesitate to contact our office.
Respectfully submitted,
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Mamadou Saliou Diallo, P.E.
RCE 54071 , GE 2704
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