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r ~ ias.~ hit; Obstrved original hydrosimic head M injection zone (length) measured from the but of the lowermost underground source o(ddnking water h.=Hydrosmoc hrad of undtrground sourr< of drinking water (length) measured from the base of the lowtsl underground source o(dnnking wmer SvGn=Specilit gravity of Owd in the injemm~ zone (dimensionless) n=J 142 (dimensionless) The above equation is based on the (ollowing as- sumptions: (i) The injection zone is homogenous and iso- tropic: (ii) The mlection zone has infinite area exltnC (iii) Tht injection well penelintes the entire thickness of Iht injection zone; (iv) The will diameter is infiniresmal compared to "r" when injection lime is longer Than a few minutes; and (v) The emplacemem of fluid into the injection zone creates mstantantous increase m pressure. (b) Fized radius. (I) In the case of application(s) (or will pemtil(s) under § 1??.38 a fixed radius around Iht will aF not less Than ont- lounh ('/,) mile may be used. f2) In the case of an application (or an area per- mit under § I?^_.39 a fixed width of not less Than one-fourth ('/Q mile for the circumscribing area may be used. In determining the fixed radius, the (ollowing (ac- tors shall bt taken into consideration: Chtmistry of injected and formation fluids: hydrogtology, population and ground-water ust and dependence, and historical practices in the area. (c) 1( the area of revitw is demnnintd by a mathematical model pursuant to paragraph (a) of Ihts section. the permissible radius is the result of such calculation even if it is less Than out-lounh ('/~) mile. 145 FR 425p0, lone 24. 1980, as amendtd m 46 FR 4x161. Aug. 27. 1981: 47 FR 4999, Feb. 3. 19821 ~ 146.7 Corrective action. In detertnmmg the adequacy of corrective action proposed by the applicant under 10 CFR 114.55 and in deiemrining Iht additional steps needed to prtvem fluid movement into underground sources of drinking water, the (ollowing enteric and (ac- tors shall be considered by the Direcor: (a) Nature and volume of mjecttd Hind; (b) Nature of native Huids or by-products of in- jection: (c) Potemially affected population: (d) Geology; (t) Hydrology: (q History of the in)ecimn operation; (g) Completion and plueeing records; (h) Abandonment procedures m t((tcl ai the time the will was abandoned; and r 0) Hydraulic connections wish underground sources a(drinking water. (Clean Watrr An, Sak Drinking Winer Act, Clean Air Acl. Resouae Consrrvation and Recovtry An: 42 U S.C. 6905, 691?. 6925. 69'_7, 6974) 145 FR 42500. June 24. 1980. as amended at 46 FR 4J I6'_, Aug 27, 1981:48 FR 14291, Apr. I. 19871 § 146.8 Mechanical integrity (a) An mjenion well has mechanical integrity i f: (I) There is nu significant leak in Iht razing. tubing or packer; and (2) There is no sigm Ocant Hwd movemem into an underground source of dunking water through vrnraal channels adjacem to Iht injection well bore (b) One of the following methods must be used m evalume the absence of signd¢ant leaks under paragraph (a)(I) of this srnion: (I) Following an initial pressure Iesh manitonng of the tubing-casing annulus pressure with suffi- cient (requtncy to be reprcsemmivt, az deternunrd by the Director, while maintaining an annulus pressure ddferrm from atmospheric prcssurc meas- urtd al the surface: (?) Pressure lest with liquid or gas: or (3) Records of monitoring showing the absence of significant changes in Iht relationship bt[wten injection pressure and injection ^ow rate for the following Class II enhanced recovery wells: (i) Existing wells completed without a packer provided That a prcssurc test has bten performed and the data is avadable and provided further That one pressure Iesl shall be pedonned al a lime w'htn the well is shut down and i( flit running of such a lest will not cause (usher loss of signifi- cant amounu of oil ar gas, or (ii) Existing wells consimcted without a long wring rasing, bui with surface casing which lermi- nalts m the bast of fresh water pmvidtd that local geological and hydrological (taturcs allow such construction and provided (usher that the annular space shall bt visually inspecltd. For These wills, Iht Director shall prescribe a monitoring program which will vtri(y the absence of signif¢ant Fluid movement from the injection zone into an USDW. (c) One of the (ollowing methods must be used to determine the absence of significam Hwd move- mrnt under paragraph (a)('_) o(ihis section: (I) The resuhs of a temperature or none log, or (?) For Class II only, cementing records deny onstmting the presence of adequate cement to pre- vem such migration: or (?) For Class III wells where the nature of the casing precludes the use of the logging techniques prescribed at paragraph (c)(U of this section, ce- menting records demonstrating Iht prcsenct u( adequate cemem to prevem such migration;