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WEISS ASSOCVITES M(J <br /> 1 INTRODUCTION <br /> This sampling plan is prepared by Weiss Associates (WA) for Diamond Walnut <br /> Growers, Inc. of Stockton, California (DWG). Five concrete underground chemical storage <br /> vaults, located on the DWG property at 1050 South Diamond Street in Stockton, California <br /> (Figure 1), are not currently in compliance with California Administrative Code Title 23: <br /> Waters; Chapter 3: Water Resources Control Board; Subchapter 16: Underground Storage <br /> Tank Regulations (Title 23), because existing vault monitoring procedures would not <br /> adequately detect leaks from the vaults. The purpose of this sampling plan is to <br /> determine how to bring the five storage vaults into compliance with Title 23. <br /> 1.1 OBJECTIVE <br /> According to the San Joaquin Local Health District (SJLHD), the compliance options <br /> described in the Title 23 Underground Storage Tank Regulations are not applicable to the <br /> DWG site due to the construction characteristics of the concrete vaults. Therefore <br /> alternative compliance options for the vaults must be considered. Options presently <br /> considered feasible are: <br /> o Remove the vaults. <br /> o Abandon the vaults in place by filling them with grout. <br /> o Leave the vaults in place and use them as secondary containment for additional <br /> tanks installed inside the vaults. <br /> The vaults cannot be left in place if they are, or have the potential to be, a source for soil <br /> or ground water contamination. The objective of this sampling plan is to determine the <br /> integrity of the vaults by collecting and analyzing soil samples from immediately below <br /> the vaults. <br /> WP1F:\ALL\331DWG\331R1AP8.DOC:74-331-00:V1.035 Page I <br />