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WORKPLAN FOR ADDITIONAL GROUNDWATER INVESTIGATION <br /> at American Moulding and Millwork Facility <br /> 2800 West Lane, Stockton California <br /> 1.0 Introduction <br /> In response to the concerns of the San Joaquin Local Health District, <br /> expressed in their November 3, 1988 letter, Dames & Moore has been retained by <br /> American Forest Products Company (AFPC) to perform an additional groundwater <br /> investigation at their former wood remanufacturing facility located at 2800 <br /> West Lane in Stockton, California. <br /> The objective of the proposed additional investigation at the site is to <br /> further evaluate potential impact on groundwater quality resulting from the <br /> subsurface release of petroleum hydrocarbons from underground storage tanks. <br /> 2.0 Scope of Work <br /> To meet the above objective, Dames & Moore will resample the three (3) <br /> existing groundwater monitoring wells and the one (1) onsite production well. <br /> The following procedure will be followed for well sampling: <br /> • The static water level will be measured in each well using an <br /> electric water detection probe. Measurements will be made, recorded <br /> and repeated until reproducible results are obtained. Water levels <br /> will be recorded to the nearest 0.01 foot from a reference point of <br /> known elevation at the well head, typically at the top of the PVC <br /> well casing. Before and after each use, the measuring device will be <br /> rinsed with deionized water; <br /> • Four to ten casing volumes of water will be removed from the well by <br /> pumping with a centrifugal pump using new dedicated PVC hose. If the <br /> water table is to low to permit pumping, the wells will be bailed <br /> with a clean PVC bailer; <br /> 1 <br /> BS/2637b/71b <br />