Laserfiche WebLink
<br />-..-----~-_.._-_.__.--_._--------~-------....--.--~._,....-.....---.- <br /> <br />TrecKMelI&RoIIo <br /> <br />.10 June 2005 <br />Project 4186.01 <br /> <br />Mr. Jonathan Schamnan <br />Silver Stone Communities <br />1733 Woodside Road, Suite 125 <br />Redwood City, California 94061 <br /> <br />DUU - 4q t'<DM-"':f- <br />[fJ~~~DW~[Q) <br /> <br />Subject: Geotechnical Review <br />3909 Vineyard Avenue <br />P1easanton, California <br /> <br />SEP 2 0 2005 <br /> <br />CITY OF PLEASANTON <br />PLP.NNlNG DEPT. <br /> <br />Dear Mr. Scharfinan: <br /> <br />This letter presents the results of our geotechnical review ofthe site at 3909 Vineyard Avenue in <br />Pleasanton. The site is north of Vineyard Avenue and west of Birch Creek Drive as shown in <br />Figure 1. The site is currently vacant. It is our understanding that plans are to construct a <br />condominium complex consisting of 45 units, each ranging in size from 1702 to 1867 square <br />feet. No basements are planned, and site preparation will require minor grading to level the <br />building pads and prepare subgrade for flatwork. <br /> <br />Our scope of services included a site reconnaissance and review of geotechnical reports for other <br />projects in the vicinity. The documents we reviewed are listed in the attached reference list. The <br />purpose of our study was to evaluate subsurface conditions at the site and present preliminary <br />geotechnical conclusions and recommendations for evaluating the geotechnical-related feasibility <br />of the proposed project. We researched reports for projects in the vicinity, and were able to <br />review geotechnical reports for Vineyard Avenue at Amador Court (MeniI & Seeley, 1983) <br />located east of the project site, and 3851 Vineyard Avenue (JCP Geologists, 1981) located west <br />of the project site. <br /> <br />SITE CONDITIONS <br /> <br />The site is bound by Vineyard Avenue to the south, Birch Creek Drive and 1- to 2-story <br />condominiums to the east, Arroyo Del Valle Creek to the north, and 2-story condominiums to the <br />west. The site is approximately 5 acres and consists of a vacant lot with several large trees and <br />grass that gently slopes down towards the north. <br /> <br />A steep bank is located north ofthe northern property line. The Arroyo Del Valle Creek is <br />located several hundred feet to the north. The bank slopes steeply, downward to the stream <br />channel north of the site. <br /> <br />SUBSURFACE CONDITIONS <br /> <br />. Borings from the previous investigations we reviewed encountered alluvial deposits consisting <br />primarily of silts and clays with varying amounts of sand and gravel and interbedded sand lenses. <br />Although the soil types encountered were very consistent, the strength ofthe upper material <br />varied. Some borings encountered stiffto hard silt throughout. Other encountered soft, wet silt <br /> <br />Treadwell & ROllo,' Inc. Environmental & Geotechnical Consultants <br />555 Montgomery Street. Suite 1300. San Francisco, CA 94111 <br />Telephone (415) 955-9040 Facsimile (415) 955.9041 <br />