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§ 146.33 (c) Where the injection zone is a formaion which is naturally wafer-beanng the following in- fonnauon concerning the injection zone shall be determined or calwlated (or new Class III wells or pro)eas (1) Fluid pressure: f2) Fracture pressure; and (3) Physical and chemical characteristics of the (onnation fluids (d) Where the in)ection fonnmion is not a water-bearing formation, the information m para- graph (c)(?) of this section muv br wbmitted. (e) Where injenion is mm a formation which contains wafer with less than 10.000 mg/I TDS monitonng wills shall be completed into the injec- tmn zone and into any underground sources of drinking water above the injection zone which could bt affected by the mining operaion. These wells shall be located in such a fashion as Io de- Iecl any excursion of injection Ruids, process by- products, or (onnation Ruids outside the mining area or zone. If the opemlion may be affected by subsidence or catastrophic collapse the monitoring wells shall be located so that they will not be physically affected. (U Where injection is into a (onnalion which does not contain water wish less than 10,000 mg/ I TDS, no monitoring wells are necessary in the injection stratum. (g) Where the injection wills pecelmle an USDW in an area subject to subsidence or cata- strophic collapse an adequate number a( moniror- mg wells shall be completed inro the USDW to detect any movemem of injected Ruids, process by-products or formation Ruids into the USDW. Tht monuonng wills shall be located outside the physical m0uentt of the subsidence or cma- strophic collapse. (h1 In determining the number, location, con- struction and frequency of monitoring of [he mon- itoring wells the following criteria shall be consid- ered: (U Tht population relying on the USDW a(- (ened or pottmially affected by the injection oper- ation: (?) The proximity of the injection operation to points of withdrawal of drinking wmer; (3) The local geology and hydrology: (J) The operating pressures and whether a nega- tive pressure gradient is being maintained; (5) The nature and volume of the injeaed Iluid, the formation water, and the process by-products: and (6) The injection well density. IJS FR J2500, June 2J, IYBO. as amended at 46 FR J3163. Aug 27, 1981. J7 FR 5000. Feb. 3. 19821 4146.33 Operating, monitoring, and re- porting requlremen[s. (a) Operating requirements. Operating rcquire- ments prcsenbed shall, at a minimum, specify Ihm: (I) Except during well stimulation injection pressure ai the wellhead shall be calculated so as to assure that the pressure m the injenion zone during in)ection does not initiate new fractures or propagate existing fractures in the injection zone. In no case, shall injection pressure initiate (rac- lures in tht confining zone or cause the migration of mjecuon or formation fluids into an under- ground source of drinking water. (2) Injection between the owennosl casing pro- tecting underground sources of drinking wafer and the well bore is prohibited. (b) hfanimring requirementr. Monitoring re- quirements shall, al a minimum, specify: (I) Monitoring of the nature of mjened Rinds with sufficient frequency to yield representative dam on its characteristics. Whenever the injection Ruid is modified to the extent that Iht analysis re- yuircd by § 146.34(a)(7)pii) a incortect or incom- phtt, a new analysis as required by ¢ 146.34(a)(7)(iii) shall be provided to Iht Direc- tor. (?) Monitoring of injection pressure and either Row tine ur volume semrmonihly, or metering and daily recording o(injecled and produced Ruid volumes as appropriate. (3) Demonstration of mechancal mtegnty pur- suant to § 146.08 al least once every five years during the life of the well (or salt solution mining. (4) Monitoring o(Ihe Fluid level in the injection zone semi~momhly, where appropriate and mon- itonng of the paramemrs chosen to measure water quality in the monitoring wells required by § 1x6.3?(e), semi-monthly. (5) Quarterly monitoring of wells required by } 146 3?(g). (6) All Class III wills may be monitored on a held or project basis rasher Than an individual well basis by manifold monitoring. Manifold monitor- ing may be used in Lasts of facilities consisting of more Ihan one infenion welh apemting with a common manifold. Separate monitoring systems for each will art not required provided the owner/ operator demonstrates thin moot (old monitoring is comparable to individual well monitonng. (c) Reporting requirements. Reporting rcquirc~ meets shalh m a minimum, include: (I) Quarterly reporting to the Director on re- quired monitoring: (2) Resuhs of mechanical integrity and any other periodic test required by the Director re- ported wuh the lost regular quarterly report oiler the completion of the lest; and 14