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§ i as.s agemeni facilities to dispose of hazardous waste. which cannot be classified under § 146.05(a)(I) or § 14605(d) (I) and (2) (e.g., wells used to dispose of hazardous wasrcs into or above a formation which contains an aquifer which has been exempt- ed pursuant Io § 146.041. (e) Class V Injection wells not included in Class h II, IIh or IV. Class V wells include: (q Air conduioning retum How wells used to remm to the supply aquifer the water used (or healing or cooling in a heat pump; (?) Cesspools including muhiple dwelling, com- munity or regional cesspools, or other devices that emive wastes which have an open bosom and sometimes have perforated sides. The UIC require- ments do not apply to single family residential cesspools nor to non-residential cesspools which receive solely sanitary wastes and have the eapac- ity to strvt kwer than 20 persons a day. (3) Cooling water return How wills usrd to in- jeel water previously used (or cooling. (4) Drainage wells usrd to drain surface Hmd, primarily norm runoff, into a subsurface (orma- lion; (5) Dry wills used (or the injection of wastes Into a subsurface formation; (6) Recharge wells used to replenish the water in an aquifer: (7) Salt N'ater immsion barter wills usrd to in- ject water ism a fresh water aquifer to prevent the imrusion of salt water mto the fresh wmer; IR) Sand backfill and other backfill N'tlls usrd to inject a mixture of water and sand, mill tailings or other solids into mined out portions of sub- surface mines whether what is mjened is a radio- active waste or not. (9) Septic system wells used m in)ect the wore or e(Huent from a multiple dwelling, business es- tablishment, community' or regional business ts- Iabhshment septic tank. The UIC requirements do not apply io single (anuly residemial septic system wells, nor to non-residential septic system wells which are used solely for the disposal a( sanuary waste and have the capacity to serve (ewer than 20 persons a day. (10) Subsidence control wells (oat used (or the purpose of od or nmural gas production) used to mjecl Huids imo a non-oil or gas producing zone to reduce or eliminate subsidtnm associated with the ovtrdmft of fresh water; (I I) Radioactive waste disposal wells other than Class IV; (I') Injection wells associated with the recovery of geothermal energy for heating, aquaculture and production of eltetiic power. (13) Wells useJ (or solution mining of conven- tional mines such as scopes lathing; (14) Wells used to inject spent boot mto the same formation from which it was withdrawn after exvaction of halogens or their salts: (IS) Injection wells usrd in experimental tech- nologies (16) Injection wills used (or in situ recovery of Ilgnitt, coal, tar sands, and ail shale. IJS FR 1251q. June 21. 1980, as amended at J6 FR 43161. Aug. 27. 1981; 47 FR 1999. Feb. 1, 19821 § 146.6 Area of review. The area of review (or each injection well or each field, project or area of the State shall be de- rcrmined according to either paragraph (a) or (b) of this section. Tht Director may solicit input from the owners or operators of injection wells within the State as to which method is most ap~ proprimt for each geographic area or Held. (a) Znne of enrlnngerin,q influence. (1) Tht zone of endangering influence shall be: (q In the case of application(s) for well pennn(s) under § I?2.3R that area the radius of which is the lateral distanm in which the pressures in the injection zone may cause flit migration of the m~eeuon and/or formation ^uid into an under- ground source ofdrinking water, or (ii) In the case of an application (or an area per- mit under ¢ 122.39, the project aria plus a cir- cumscribing area the width of which is the lateral distance from the perimeter of the projtn area, in which the pressures in the in)ection zone may cause the migrmion of the injection and/or forma- tion Hmd into an underground source of drinking water. (21 Computation of the zone of endangering in- Huence may be based upon the parameters listed below and should be calculated (or an injection time period equal m the expected life of the in)te- iion well or pattern. The following modified Theis equation illu.slrJies one (omi which the mathemati- cal model may take. ' 225 KHi ~^- r=* slox where. 4t[KH(h.. ~ hi„xSvGn) X = 23Q r-Radius of endangering influence from m)ecuon well (length) k=Hydraulic condo vvuy of the injection zone (length/ time) H=7Ttickness of the m)ecuon zone (length) wTime of injection fume) S=Anmge coefhcieni (dimensonles9 Q=lnjcnion rate (volumdume)