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x • • <br /> MARLEY COOLING TOWER COMPANY " --s <br /> STOCKTON, CALIFORNIA FACILITY NOV Z 7 1989 <br /> ENVIRONMENTAL PFAI 9i <br /> SOUTH YARD STORM WATER SAMPLING <br /> SCOPE OF WORK <br /> 1.0 INTRODUCTION <br /> South Yard cleanup efforts have been beneficial and effective in reducing <br /> chromium, copper, and arsenic contamination of storm water runoff from <br /> Marley Cooling Tower Company's (MCTC's) South Yard. The reduction of <br /> contaminant concentrations is evidenced by previous sampling activities <br /> as discussed in Section 3.3.3 of Volume I of MCTC's Remedial <br /> Investigation/Feasibility Study (RI/FS) . However, the RI/FS also indicated <br /> that previous South Yard storm water runoff has contaminated offsite ditch <br /> soils in some areas (Volume I, Section 6.1) . The RI/FS identified the <br /> South Yard storm water runoff and any sediment deposits within the South <br /> Yard drainage pipes as the only potential remaining sources of additional <br /> soil contamination. <br /> Volume II of the RI/FS evaluated and recommended surface soil and South <br /> Yard drainage pipe remediation efforts. The recommended remedial actions <br /> included ditch soil removal from contaminated areas and sediment sampling <br /> of South Yard drainage pipes. The sediment sampling results would be used <br /> to plan appropriate drainage pipe cleaning efforts which would mitigate <br /> additional soil contamination. <br /> This proposed sampling plan is designed to confirm or discount the South <br /> Yard storm water runoff as a source of additional soil contamination. The <br /> storm water sampling will be conducted in a manner which indicates storm <br /> water runoff quality prior to interfences by drainage pipe sediments or the <br /> existing ditch soils . As sampling contractor, Slack & Veatch personnel <br /> will conduct storm water sampling in accordance with this scope of work. <br /> 1 <br />