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Vii <br /> / Kurtz Street <br /> San Woodward-Clyde Consultants <br /> San Diego, California 92110 <br /> (619)224.2911 <br /> January 23, 1987 <br /> Project No. 8753009X <br /> San Joaquin Local Health District <br /> 1801 East Hazleton Avenue <br /> P.O. Box 2009 4 <br /> Stockton, California 95201 4 <br /> Attention: Ms. Laurie Cottula <br /> PIEZOMETER INSTALLATION PERMIT <br /> PORT OF STOCKTON <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Cottula: <br /> Woodward-Clyde Consultants ) ' <br /> Y (WCC) has been retained to assist the a <br /> Stockton Port District by conducting an investigation of <br /> g groundwater <br /> elevations in the petroleum tank terminal area at the Port of Stockton. <br /> This letter is submitted at the request of Ms. Laurie Cottula (San Joaquin <br /> Local Health District) in support of the piezometer installation permit <br /> application. <br /> Our investigation involves the installation of thir17 to piezometers to <br /> monitor fluctuations in groundwater elevation and determine local <br /> groundwater flow directions. Piezometer installation specifications and the <br /> monitoring procedures are discussed below. A site plan and piezometer <br /> construction diagram are included as Figures 1 and 2. <br /> Thirty-two piezometers will be installed in an array surrounding the tank <br /> terminal area (Figure 1) at the Port of Stockton. Installation specifications <br /> and monitoring procedures for the piezometers will be as follows: <br /> ° The piezometers will be constructed of 1-inch diameter Schedule <br /> 80 PVC pipe and installed to a depth of about 10 feet. The <br /> screened interval will be 5 feet in length and a 5-foot length of <br /> blank casing will extend from the screen to the ground surface <br /> (Figure 2). <br /> ° The piezometers will be installed with assistance from a licensed <br /> (C-57) drilling company (Kvilhaug Drilling of Concord, <br /> California). A fence post driver will be used to install the <br /> piezometers to total depths of about 10 feet. The natural soil <br /> materials will provide the filter pack; additional backfill material <br /> should not be necessary. <br /> Consulting Engineers.Geologists <br /> and Environmental Scientists <br /> Offices in Other Principal Cities AdrA <br />