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- • - - - • h� KLEINFELDER <br /> 6 FIELD SAMPLING AND ANALYSIS PLAN <br /> 6.1. SAMPLING RATIONALE AND APPROACH <br /> The preliminary objective of sampling during the PEA is to provide consistent analytical <br /> data that identifies potential contaminants at the site based upon the available site <br /> information and historical review, The site's 0.56 acres have been used primarily as a <br /> metal plating facility for the last 30 years. In developing our sampling approach for this <br /> project, we assume that groundwater quality is not an issue at this time pending review <br /> of shallow and subsurface soil sampling results. Kleinfelder also understands the City <br /> of Stockton supplies water to the site and surrounding areas. The subject site has been <br /> used for commercial/industrial use for approximately 30 years and assumes that the <br /> site will continue for said use. Based on this assumption, the proposed human health <br /> screening is based on industrial/commercial use of the site. <br /> Our soil sampling approach was developed based on DTSCs request for further <br /> evaluation of two primary areas of concern (AOC) including the Plating Room and <br /> Wastewater Treatment Area and identification of the following constituents of potential <br /> concern: <br /> • Acids and bases (pH values in soil). <br /> • Chromium III (Cr III) <br /> • Chromium VI (Cr+6) <br /> • Nickel (Ni) <br /> • Copper (Cu) <br /> • Cyanide (Cn) <br /> • Aluminum (AI) <br /> Kleinfelder's proposed soil sampling is site specific based on observations of the <br /> Plating Room and Wastewater Treatment Area and site maps and legends of these two <br /> areas supplied by Delta Plating Inc. These maps illustrated facility operations including <br /> tank locations and associated metal or compound used, waste stream piping routes, <br /> rinse and holding tanks, process tanks etc. The two areas both have concrete flooring. <br /> The Plating Room was covered with wood planks but the concrete appeared in poor to <br /> moderate condition. Concrete in the Treatment Plant Area appeared in good condition. <br /> Kleinfelder understands relatively free access will be granted in the Plating Room since <br /> the tanks have reportedly been moved, therefore, sampling locations are proposed <br /> 57252.T02/ST05R999/DH:Iv Page 12 of 29 <br /> ©2005 Kleinfelder, Inc. September 1,2005 <br />