HomeMy WebLinkAboutHMP 16-03; MANANTAN RESIDENCE; ADDENDUM #1 LIMITED GEOTECHNICAL INVESTIGATION; 2016-10-21CIVIL ENGINEERS
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ADDENDUM #1
LIMITED GEOTECHNICAL
INVESTIGATION FOR
The Manantan Residence
2667 Cazadero Drive
Calrsbad, California
October 21., 2016
Prepared for:
Mr. Alex Manantan
2667 Cazadero Drive
Calrsbad, California
Prepared by:
Civil Engineering Consulting Services
P.O. Box 2158
Valley Center, California
OCT 2 52016
LAND DEVELOPMENT
ENGINEERING
P.O. Box 2158 Valley Center, CA 92082 Phone: (760) 271-8261 Fax: (866)313-8908
Email: rnarco@engineeringconsulting.us
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DECLARATION OF RESPONSIBLE CHARGE
This Project has been prepared under the direction of the aforementioned Registered Civil
Engineer. The engineer attests to the technical information contained herein and the engineering
data and calculations, if any, upon which recommendations, conclusions and decisions are based.
The engineer is not responsible for any deviations made in the field from these calculations and
or the corresponding project plans.
Et SS
Civil Engineer
P.O. Box 2158 Valley Center, CA 92082 Phone: (760) 271-8261 Fax: (866) 313-8908
Email: marcoengineeringconsulting.us
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Consulting Services
Recommendation for Permeable Pavement
Permeable pavement may be used in lieu of conventional asphalt concrete or concrete as long as
it is not placed over expansive soil. Permeable pavement may be either porous asphalt, pervious
concrete, or permeable concrete payers. We recommend concrete payers be placed over a
minimum 2" sand bedding layer, over a 6" to 9" minimum of rock bedding. This structural
section should be placed over 12" of minimum compacted subgrade to 95% relative compaction.
Due to the slope of the proposed permeable pavement driveway, the suhgrade to receive the
structural section should be benched with equal steps every 10 feet. The steps should be 8"
maximum in height. The 10-foot section should include cutoff walls.
Fill areas shall follow the fill material and compaction provisions of this report.
Expansive Soil Mitigation
Due to encountering a layer of clayey expansive soils in boring B-i in the middle of the lot, there
is the potential of encountering expansive soils in other areas of the lot. The field inspections that
are to be done during the grading work will attempt to make sure that no expansive soil is in the
area below the proposed structure or permeable pavement. In the event expansive soils are
encountered the following steps could be taken in no particular order:
Removal of expansive soil if a small layer is encountered and replacement with
non-expansive soil.
Treatment/Stabilization of expansive soils with time or other chemicals admixtures.
Add a reinforced geogrid below the area of the fill for the driveway.
Removal of the upper expansive layer and backfill with 10 to 12" of 1/4"to 1" gravel.
P.O. Box 2158 Valley Center, CA 92082 Phone: (760) 271-8261 Fax: (866) 313-8908
Eniai I: niarco@engineeringconsultingus