Section Env-Or 307.10 - AST System Design Standards(a) AST systems installed on or after April 25, 1997 shall be located and spaced as specified in Env-Or 305.01(c).(b) AST systems installed on or after April 25, 1997 shall not be constructed within the floodway portion of the special flood hazard area.(c) AST systems and associated pipes and distribution equipment installed on or after April 25, 1997 shall not be located along highway curves or otherwise exposed to traffic hazards without suitable protection. For the purposes of this rule, suitable protection means a barrier that will protect the AST system against an impact equal to the design speed of the roadway.(d) AST systems installed on or after April 25, 1997 shall be physically protected from vehicular collision by fencing, barriers, or bollards, subject to the following: (1) Bollards shall be spaced no more than 4 feet apart; and(2) All barriers shall be painted with a reflective paint or be partially covered with a reflective tape.(e) At any site that did not have an AST system prior to January 21, 2009 at which construction of an AST system is proposed on or after January 21, 2009, no AST system shall be located closer than the applicable distance specified in Table 307-1: Table 307-1: Minimum Distance from AST System to Water Supply Sources
| Contents of AST | PWS Source | Non-Public Water Supply Well |
| Gasoline | at least 500 feet | at least 250 feet |
| Heating oil used only for on-premise heating | outside of protective radius | at least 75 feet |
| Oil other than gasoline used only for on-premise emergency electrical generation | outside of protective radius | at least 75 feet |
| All other contents | at least 400 feet | at least 75 feet |
(f) No AST system shall be added, substantially modified, or replaced within the sanitary protective area of a public water system source.(g) At any site that did not have an AST system prior to January 21, 2009 at which construction of an AST system is proposed on or after January 21, 2009, no AST system shall be located within 75 feet of surface waters of the state unless it is at a marina, hydro electric facility, or the facility receives oil by way of waterborne transportation.(h) At any site that had an AST system prior to January 21, 2009, if the minimum separation distance specified in (e) or (g), above, are not met, the addition, substantial modification, or replacement of an AST system shall not decrease the separation distance.N.H. Admin. Code § Env-Or 307.10
(See Revision Note at chapter heading for Env-Or 300) #10487, eff 2-7-14