CORRESPONDENCE_1984-1989 - Laserfiche WebLink

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Forward Inc. Landfill -2- 17 March 1988 Inspection Report During inspection of the active Class III landfill (WMU D 88), a Stockton Scavenger truck discharged a drop box loaded with black liquid into the landfill. The truck driver, who did not know that the landfill was prohibited from accepting liquid waste, stated that the load originated from a walnut processing plant where nut shells are burned to produce energy. The driver also stated that the load consist- ed of walnut shell ash with excess water. The landfill equipment operators immediately mixed the liquid with soil to absorb the moisture. This event emphasizes the need for improved load checking at the facility and better customer and driver awareness of wastes acceptable for discharge at the landfill. Forward Inc. recently completed construction of a Class II surface impoundment at the landfill. The impoundment is im- mediately west of WMU E (ash pit) in the southwest corner of the facility. At the time of the inspection, rain water covered approximately the southern one-third of the impound- ment to a depth of about 15 cm. In the dry area of the impoundment bottom, the compacted clay liner had 2 to 4 mm wide desiccation cracks spaced at 5 to 10 cm intervals. Rain water had also collected outside of the impoundment to a depth of 10 cm in a low area along the base of the eastern levee. The impoundment levees had a rough, uncompacted surface. Along the top of the levees numerous cracks 1 to 2 cm wide trending parallel to the levees have formed 30 to 40 cm from the hinge point on both the inner and outer edges. This condition suggests minor settlement and/or slope failure is occurring along the top of the levees. Erosion rills 15 to 25 cm deep formed at 10 to 15 locations along the inside of the levee. A 3 -inch PVC leachate discharge line extends from the land- fill WMUs to the southeast corner of the surface impoundment. Gravel rip -rap covers a small area on the bottom where the leachate line discharges into the surface impoundment. Water sample collection from monitoring wells 4, 5A and 8 was also observed during the inspection. For each well, an air - drive pump was used to purge three casing volumes from the well. Samples for general minerals, trace metals, radioactivity and other constituents were collected from the pump's discharge line following the purge period. Then the air compressor was shut down and the pump pulled from the well. The pump design allows for water to remain inside the pump during removal from the well. Water for VOC samples was collected by inserting a tap into the bottom of the pump to lift the check valve and drain water into the VOC vials.