FIELD DOCUMENTS AND WORK PLANS 1988

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POND PREPARATION PLAN The Storm Water Retention Pond at the Marley Cooling Tower Company (MCTC) site in Stockton, California has been drained and is ready for commencement of final closure activities. To allow for gathering and evaluation of additional data to support the selected closure alternative and to allow for efficient completion of closure activities it has been determined that major construction activities in the vicinity of the pond will not commence until the spring of 1989. As stated in the draft Engineering and Environmental Analysis, the pond poses the following potential exposure routes associated with the contaminants available media and migration pathways. 1. Ingestion of contaminated groundwater. 2. Inhalation of contaminated wind borne dust. 3. Direct dermal contract of MCTC employees with contaminated soils or waste residuals. The following pond preparation steps will minimize the potential for additional exposure. 1. Potential for groundwater contamination has been greatly reduced by removal of the liquids from the pond. Accumulated precipitation will be removed from the bottom of the pond through the use of the existing pump used to dewater the pond. The removed water will be treated and discharged in accordance with the NPDES permit. A sump will be created in a low spot in the pond to enhance drainage and to maximize precipitation withdrawal from the pond. 2. The sediments and interior pond soils have not exhibited a tendency to be prone to generation of dust. Dust generation will be further minimized by sprinkling the interior faces of the pond with water. An agricultural sprinkler system will be installed around the perimeter of the pond berm. The pond sediments will be sprinkled intermittently during periods of extended dry weather. Excess water that may accumulate in the bottom of the pond will be pumped out for treatment.