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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). 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. The steel double walled tank was labeled with a manufacture date of June 1999. The Convault double walled steel/concrete Reclaimed Gasoline tank has a manufacturer warranty for 20 years. However, a serial number or manufacture date was not identified on the tank. Therefore, 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. • Secondary containment associated with the hazardous waste tank systems are compliant with the regulations identified in 22 CCR 66265. The Used Oil, Waste Antifreeze, and Reclaimed Gasoline tanks are in good condition with no apparent leaks or other damage. The containment volumes are sufficient to contain the volume of the largest tank and longest piping run within each compartment. The XLPE materials of construction are compatible with the materials stored subject to the exceptions specified above for the tanks. The steel/concrete double walled tank is compatible with the stored Reclaimed Gasoline. In addition, the secondary containment should continue to be periodically inspected by site personnel for evidence of leaks and/or damage. parts, or equipment'observed is, Hazardous Waste Tank AssessmentDEC Os$.2016 Stockton,CA Auto Parts Group—Pick-N-Pull 8 Project No.04.20160002 ENVIRONMENTAL HEALTH Del—%RTMENT