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v <br /> 1988. The Plan allows for steamcleaning the tanks should the <br /> samples detected contamination above hazardous waste criteria. - The <br /> tanks will be dismantled and sent to a metal recycler. The <br /> underground tank' and piping will 'be steamcleaned, sampled, and <br /> disposed as scrap metal. Some pumps and piping may be reused if <br /> they can be successfully decontaminated. <br /> Up to approximately 10, 000 gallons of wastewater and 14 drums <br /> of solid material could be generated should repeated <br /> decontamination :procedures be required. All washwater will be <br /> managed as hazardous waste and transported to a treatment and <br /> disposal facility.' The washwater will be stored in drums and <br /> stored in a temporary plastic lined contaminant area. The drums <br /> will be emptied into a vacuum truck for transportation. <br /> Environmental samples will be collected at or near all <br /> equipment which handled hazardous waste. The containment area <br /> surrounding the aboveground tanks and sumps will be cleaned and <br /> sampled. If decontamination of sumps or the containment area is <br /> unsuccessful or if soil contamination is detected, the Plan <br /> provides for removal of up to 50 cubic yards of material for <br /> disposal as hazardous waste. <br /> In the event that sampling indicates that more than 50 yards <br /> would require removal, the Plan identifies steps that the facility <br /> must take. These steps include notification of. DTSC, preparation <br /> of a workplan to investigate, mitigate, or take other appropriate <br /> . action, and submittal of workplans, reports, specifications and <br /> schedules to DTSC. DTSC must approve the documents prior to any <br /> action by the facility. Future actions- will require CEQA analysis <br /> of the environmental impact of the proposed actions. The goal of <br /> closure is to ensure natural- background concentrations for soil by <br /> comparison to samples from uninfluenced areas. The goal for <br /> closure of the equipment is to ensure the equipment has been <br /> cleaned to a level that will not pose a health risk. <br /> Field activities are scheduled to last eight weeks with <br /> disposal of wastewater and solids (soils, disposable clothing, etc. ) <br /> occurring within 90 days. Scrap metal will be removed within four <br /> months exceppt one aboveground tank will not be removed until <br /> mid-1996: An estimate of 20 truck trips will be required for <br /> removal of the hazardous wastes generated during this closure. <br /> Environmental Setting <br /> The Simplot facility is located on approximately 100 acres of <br /> land in an area zoned by the City of Lathrop for industrial use. <br /> Surrounding properties are large industrial complexes, business <br /> parks, . and agricultural land. The project is in the central <br /> portion of the facility called the Ag Chem area. The Ag Chem area <br /> is approximately five acres and includes warehouse buildings, <br /> offices, a tank farm, and a rail car loading area. The area is <br />