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SuDplement to RP 1604 -- p. 4 Add a new major title SECTION 3 -- PERMANENT CLOSURE AND CHANGE OF SERVICE, and insert the following sections : 3 . 1 General Requirements 3 . 1. 1 Applicability Permanent closure of an UST can take place through abandonment in place or removal from the ground. A change of service (that is, conversion of the UST to storage of a non-regulated substance) should also be subject to many of the safeguards that apply to permanent closure. 3 . 1. 2 Notification The implementing agency must be notified at least 30 days before permanent closure or change of service is begun. 3 . 1. 3 Site Assessment Following notification, but before closure or change of service is completed, a site assessment must measure for the presence of a release at those places where contamination is most likely to be found. If the UST has been subject to release detection in the form of vapor monitoring, ground water monitoring, interstitial monitoring (in the form of monitoring between the walls of double wall tanks or observation wells) , and if no release is indicated, then further site assessment is not necessary. 3 . 1. 4 Corrective Action If the site assessment indicates that a release(s) has occurred, then appropriate further evaluation and corrective action must be undertaken. See API Publication 1628 . 3 . 1. 5 Recordkeeping Records demonstrating compliance with closure requirements must be maintained. The results of any site assessment of the excavation must be maintained for at least three years. These records can be kept by the owners and operators who took the tank out of service, by the current owners of the site, or by mailing the records to the implementing agency. Change "SECTION 3 -- DISPOSAL IN PLACE" to "Section 3 . 2 Disposal in Place, " and renumber the subsections accordingly.