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Marley Cooling Technologies • • 22 July 2002 San Joaquin County Inspection Report The site is divided into two areas,the North Yard and the South Yard. All past wood treatment activities were conducted on the North Yard. In the past, rain falling on the North Yard became contaminated after contact with treated cooling tower components. The North Yard in now essentially empty of processing materials, and Marley is undertaking a study to re-characterize the quality of the stormwater run-off. Currently, rainwater is collected in a storm drain system and is passed through the treatment plant in the northeast portion of the site. Due to the past practice of storing treated wood products on the MCTC South Yard, some wood treating chemicals had been detected in the storm water runoff from the South Yard. The South Yard surface has been cleaned and residual contamination in pipes and ditches removed as part of the remedial actions undertaken by Marley. The groundwater treatment facility is designed to treat a maximum flow up to 0.94 mgd. Groundwater is extracted from a minimum of 17 extraction wells on and off-site. The groundwater extraction system can operate in a cyclical fashion with each of the two cycles lasting 56 hours or on a continuous basis with all extraction wells pumping at rates varying from 10-90 gallons per minute depending on effective capture of the groundwater contamination plume. When cycling,primary groundwater extraction is alternated between the north zone and the area south of the site. Water extracted from the north zone has higher contaminant concentrations. During south zone pumping,the capacity of the treatment plant is not fully utilized unless supplemental waste sources are added. Flushing water may be added to supplement the groundwater contaminant concentrations. Additionally, when sufficient storm water is accumulated on the North Yard to justify treatment, the operator will manually initiate storm water treatment through the Andco system. Groundwater from selected wells is simultaneously delivered to the ion exchange treatment system. After treatment,water from the two systems is combined, and an effluent pump sends water to the soil flushing area and/or to a conveyance pipe which discharges to the Stockton Diverting Canal. t; -„n 111 Electrochemical reduction and precipitation System . Ion exchange treatment system Building on Right 3 Approved: