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I�EAkTHCONV 5.0 CONCLUSIONS AND RECOMMENDATIONS The following is a summary of the findings for the Hazardous Waste Tank System and the associated piping and ancillary equipment: • The hazardous waste tanks are compliant with the regulations identified in 22 CCR 66265. However, based on manufacturer specifications, permeation of the tank contents into polyethylene may occur depending on each chemical. Ethylene glycol (antifreeze)does not attack or permeate high density crosslinkable polyethylene (XLPE) resins up to 100° F. Petroleum hydrocarbons (such as fuel oil, diesel, etc) does not attack XLPE resins; however, they will be absorbed into the wall of the tank and permeation and loss will occur. It is not recommended for XLPE tanks containing Used Oil to be stored at room temperatures above 100° F. In addition, the manufacturer states that the general life expectancy of the crosslink XLPE tanks is 10+ years with 15 to 20 years being common depending on chemical, concentration, temperature, installation and piping, and venting. The serial numbers on the Used Oil tanks and the Waste Antifreeze tanks indicate manufacture dates of 1995 or earlier (with the exception of 02 with an approximate manufacture date of 2009). In addition, the Customer Drop-off tank does not have a serial number on the tank but according to Site representatives, it is approximately 10-15 years old. The tanks appeared to be in good condition; however, several of the tanks appeared to have discoloration due to possible permeation of the tank contents over time. Based on the fact that the tanks are at the upper end of their life expectancy it is recommended that replacement of tanks be evaluated on a case-by-case basis. As noted above, the earliest tank was installed in 1999 and associated tank tightness testing data is not available. However, when tanks are replaced on-Site tank tightness testing is required. In addition, the tanks should be inspected daily for leaks and/or damage by site personnel using the inspection form provided in Appendix E or an equivalent Pick-N-Pull document. • Tank clips and/or bolts were not observed. However, installation of tank clips and/or seismic cables is not recommended. After discussions with a representative from Poly Processing (manufacturer), and as evaluated by our Civil P.E., it was concluded that significant movement of these types of tanks are unlikely given their stable construction. The tank height and width ratio make them unlikely to tip over during a seismic event. • Secondary containment associated with the hazardous waste tank systems are compliant with the regulations identified in 22 CCR 66265. It is in good condition with no apparent Hazardous Waste Tank Assessment Stockton,CA Auto Parts Group—Pick-N-Pull 9 Project No.04.20160002