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-OCT -26-93 MON 11:25 • P.03 209-4'77-2440 W. T. WL & CO. i PME 176 PO4 OCT 25,93 00:31 P13se II Fnvironmental Assessment Modified Proposal 152 Frank West Circle • Stockton, CA Page 2 October 21, 1993 Room sump. The majority of these vats were observed to be full and most of them contained labels identifying the chemicals within each of then -L C,K.C, estimates approximately 13,500 gallons of liquid chemicals will require removal and disposal. Liquid chemicals that are determined to be compatible will be pumped from the vats using vacuum trucks. Once the liquid chemicals have been removed from the vats, the vats will be steam cleaned using a high-pressure steam washer. The rinsate generated during the steam cleaning process will also be pumped into the vacuum trucks. Characterization of this fluid and preliminary acceptance for disposal of the fluid will have been completed during Task 1, therefore, C.K.C. anticipates that the fluids will be transported immediately following completion of pumping and steam cleaning activities. Liquid chemicals that are not compatible with the bulk of the liquid chemicals described above will be pumped into DOT approved, 55 -gallon poly drums and will be stored on-site. Once the vats have been pumped and steam cleaned, they will be moved out of the Plating xoom to a staging area lined with 6 -mil visqueen. Task 3 - Steam Clean and Remove Wooden Flooring in Plating Room Once the vats have been removed from the Plating Room, the wooden flooring surrounding the vats will be dcaned using a high pressure steam washer. The rinsate generated during the steam cleaning process will be pumped into vacuum trucks. After steam cleaning the flooring, it will be moved from the Plating Room to a staging area lined with 6 -mil visqueen. Task 4 - Empty and Steam Clean Concrete Sump Areas Visual observations reveal that approximately 6 inches of water and chemicals are present within a 5,000 square -foot concrete -lined sump in the Plating Room. Although the standing water in the Hazardous Waste Treatment Area and Tank Containment Area sumps has evaporated, solidified chemicals do remain, as noted in the Limited Phase II Environmental Assessment report. ASH recommends that the sumps be steam cleaned in a timely manner since they are partially uncovered and Will soon receive storm water runoff which will become contaminated and require disposal as hazardous waste C.KC. proposes to empty the Plating Room sump using vacuum trucks, steam clean the surfaces of all three sumps, and empty the rinsate from the sumps. C.KC. estimates that approximately 18,000 gallons of fluid and rinsate will be removed from the threr sumps. Characterization of this fluid and preliminary acceptance for disposal of the fluid will have been completed during Task 1, therefore, C.K.C. anticipates that the fluids will be transported immediately following completion of the sump cleaning activities. R=95% 10-25-93 11:29AM P003 #45