HomeMy WebLinkAboutCT 14-03; BEACHWALK AT MADISON; PRELIMINARY GEOTECHNICAL EVALUATION; 2014-09-19GeoTek, Inc.
1384 Poinsettia Avenue, Suite A Vista. CA 92081-8505
(760) 599-0509 (760) 599-0593' ,, www.geotelcusa.com
Vesta Pacific Development
1818 2nd Street
San Diego, CA 920 I I
Attention: Mr. Geoff McComic
SEP 2 6 2014
Subject: Comments Regarding Tentative Map
Beachwalk at Madison
Carlsbad, California
September 19, 2014
Project Number 3441-SD
Reference: "Preliminary Geotechnical Evaluation, APN 203-100-0 I, Madison Street Project,
Carlsbad, California" by Geo T ek, Inc., dated September, 30 2015
Dear Mr. McComic:
Presented herein are comments regarding the "Tentative Map for Beachwalk at Madison"
prepared by Pasco Laret Suitor, dated September 17, 2014. The Tentative Map includes Sheets I
and 2. Sheet 2 is a Preliminary Grading Plan.
We had not been provided with a grading plan in preparing our referenced report. However, the
proposed overall grading is to lower the site from existing grades which was addressed in our
report and recommendations developed accordingly.
We were requested to address three specific items pertinent to the Tentative Map.
a. Determine the minimum and maximum recommended positive grade away from the foundation
for impervious and pervious surfaces:
Comments: The Preliminary Grading Plan indicates that a minimum fall of 2.0% will be
maintained near the foundations. This is consistent with our opinion for both pervious and
impervious surfaces.
b. Provide recommendations for the pervious pavement and bio-retention (vegetated
swale) design:
Comments: Sheet I of the Tentative Map provides typical sections for both the pervious
pavement and bio-retention designs are provided. Those designs are in general keeping with
industry practice and are as such considered acceptable. Paver manufacturers may have slightly
variant preferred section designs and the final design should consider the manufacturers criteria.
GEOTECHNICAL I ENVIRONMENTAL I MATERIALS
C
Comments on Tentative Map
Beachwalk at Madison
Carlsbad. California
September 19, 2014
3441-SD
Pa~e 2
c. Provide analysis of potential soil contamination caused by a history of dumped vehicles and
other equipment on site which has since been removed.
Comments: As part of a Phase I Environmental Site Assessment, Geo T ek reviewed
environmental data base report and other pertinent data for the site and nearby area. The site
was observed in aerial photographs to have vehicles and possibly storage containers on it starting
in late 2006 and continuing through late 2012 or early 2013. While it seems likely that some oil,
or other petroleum products were spilled during that time period, our experience suggest that
lubricants would be the most significant products. These typically leave obvious soil staining. No
significant staining was noted during site observations. No conditions of recognized
environmental concern were noted that were considered to warrant further assessment.
Closure
Our above findings/recommendations were prepared in conformance with generally accepted
professional engineering practices and no further warranty is implied. This report is subject to
review by the controlling authorities for this project. Geo T ek accepts neither responsibility nor
liability for work, testing, or recommendations performed or provided by others.
If you should have any questions, or if Geo T ek can be of additional service, please do not
hesitate to contact the undersigned.
GeoTek, Inc.
Tim
CEG I 142, Exp. 04/30/ I 6
Principal Geologist
Copies: (I) Addressee via email
(I) Brian Ardolino via email
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RCE 35007, Exp. l\8-1'n:t.
Senior Project En
GEOTEK