HomeMy WebLinkAboutTract Map 9833-3 Lot 20 Geologic Observations
..I"{ ..-"
,; - -1'-
.
. ~ETRA
.
-]..pm-/63ee
;I? t:ffJj-3
fiT610
I.
COSTA MESA . SAN DIEGO . TEMECULA . LOS ANGELES
July 30, 2001
IN. 355-01
CITY OF TEMECULA
43174 Business Park Drive
Temecula, California 92590
Attention: Mr. Ron Parks
Subject: Geologic Observations of Bedrock Shears and Structure In Footing
and Swimming Pool Excavations, 30623 Jedediah Smith Road,
Temecula, Riverside County, California
At your request Petra Geotechnical, Inc. (Petra) has visited the property located at
30623 Jedediah Smith Road and provided geologic observations of existing
excavations at the subject property. At the time of our visit, the owner Mr. Vince Bean
was at the site. The best exposures of the Pauba Formation bedrock were found in the
swimming-pool excavation, although similar conditions could be seen within other
footings at the site.
We observed moderately dipping bedrock of the Pauba Formation in the excavations.
The moderately dipping beds are anomalous to regional dips found in the Pauba
Formation, except those found in close proximity to faulting. Striated clay beds and
seams were observed as shears both along primary bedding withing the Pauba
Formation and also as a near-vertical clay shear located at the southern end ofthe pool
exyavation.
It is our understanding that a fault investigation for the Wildomar fault was conducted
at the site; however the fault setback zone is located more than 150 feet southwest of
the observed shears. The Wildomar fault is considered active by the State of
California. It is our recommendation that the geologic consultant ofrecord evaluate
the exposed shears with regard to faulting. This evaluation should include a
\
PETRA GEOTECHNICAL, INC.
27620 Oommerce Center Drive. Suite 103 . Temecula . CA 92590 . Tel: (909) 699-6193 . Fax: (909) 699-6197 . petrate@ibm.net
;~~;' "
.
.
CITY OF TEMECULA
30623 Jedediah Smith Rd/Temecula
July 30, 2001
IN. 355-01
Page 2
correlation of the recently exposed shears and bedrock structure to the previous fault
investigation. The consultant should then provide appropriate updated conclusions and
recommendations with regard to faulting at the subject property.
We appreciate this opportunity to be of service. If you have any questions, please
contact this office.
Respectfully,
TLJ/keb
Distribution: (2) Addressee
1/
~
~