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I'l5EAkTHCON9 5.0 CONCLUSIONS AND RECOMMENDATIONS The following is a summary of the findings for the Hazardous Waste Tank System: • The hazardous waste tanks are compliant with the regulations identified in 22 CCR 66265. Based on manufacturer specifications provided in Appendix C, permeation of the tank contents into polyethylene may occur depending on the type of chemical being stored. 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) also does not attack XLPE resins but can be absorbed into the wall of the tank over time. Permeation and loss can slowly occur. Manufacturers design XLPE tanks to withstand 100°F and recommend that stored liquids should not exceed 10011F. Outdoor temperatures in Stockton occasionally exceed 100°F during the summer months; however,temperatures do not typically sustain over 100° F throughout the entire day and temperatures cool overnight. The temperature of the used oil stored within the tanks are not likely to exceed 100°F. In addition, the tanks are located under roofing and are not directly exposed to the elements. Some of the used oil storage tanks did appear to have discoloration, which may be due to possible permeation of the tank contents overtime. However, the tanks appeared to remain in good condition and replacement is not recommended at this time. Determining the need for replacing the tanks should continue to be evaluated on a case-by-case basis. This evaluation should continue to be conducted by continuing to perform daily visual inspections of the hazardous waste tank system. • 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). According to Site representatives, the Customer Drop Off tank is approximately 10-15 years old. All of the tanks of the hazardous waste tank system were observed to be in good condition. During the Site visit, evidence of damage and/or leaks with the tanks of the hazardous waste tank system was not observed. However, based on the fact that these tanks are at the upper end of their life expectancy, it is recommended that replacement of the tanks continue to be evaluated on a case-by-case basis. This evaluation should continue to be conducted by daily visual inspections of the hazardous waste tank system. • Discussions with the manufacturer indicated that tanks are tested for tightness prior to distribution to the client. As noted above, the earliest tank was installed in 1999 and Hazardous Waste Tank Assessment Stockton,CA Schnitzer Steel—Pick-n-Pull 8 Project No.04.20160002