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A rain gauge is located at the Yankee Gulch Lease site. The rain gauge is located clear of <br />overhead obstnlction. Data from the gauge is stored on a data logger and downloaded <br />periodically. <br />4.3 Post-~9ining Surface ~~'ater 1~Ionitoring <br />At such time as the Yankee; Gulch Project may pcrn~anently suspend commercial operations, <br />there may be a need for continued monitoring of the surface water system beyond shut-down of <br />the plant and well field. In the event that the project pcrn~anently suspends commercial <br />operations, American Soda will continue to provide support to the t1SGS to monitor the surface <br />water system For a time period as required to complete monitoring. American Soda will consult <br />with the BLM and CDMG to detern~ine the extent and time frame for post closure hydrologic <br />monitoring. <br />5.0 Process Monitoring <br />The solution mining process will be monitored according to the schedule and criteria presented in <br />this section. All process monitoring data will he included in monitoring reports that will be <br />submitted monthly to the regulatory agencies (described in Section G.0). Details of the process <br />monitoring schedule and criteria are presented in Table ~. <br /> <br />Parameter Munuurin~ Recording Frequency <br />In ectiun Pressure All[Omatii -Per \\'cll I (l minute <br />Injectiun 1'em ~eraturc .Autumatic -Pcr Well I11 minute <br />Injection [)cnsity Automatic -Pcr Well 111 nunute <br />In cction Flo~~ Rate Autumatic -Pcr \\'cll l 11 minute <br />Production Pressure Automatic -Per \\"rll 10 minute <br />Prvduction Tcm erature Automatic -Pcr Well It) minute <br />Production [)ensity Automatic -Pcr Well I11 minute <br />Production hloN Rate Automatic -Per well 10 minute <br /> <br />I~itros;en Consum bon Manual -Per \I'cll [)wily <br />Nitros;cn Pressure Automatic Per Well Itt minute <br /> <br />l! per and F,o~yer Production Stream and In ection Stream <br />Water Quality ('P List Manual Quarterly <br />Carbvn Diuxidc Mamral Monthly when a eratin <br />htethanc Manual Monthly when v cratink <br />BTFX Manual Monthly when o erann~ <br />Oil and Grease Manual Monthly when o eratin~ <br />T('LP Paramctcr~ and PIi Manual ARcr Srm-uP ur ~~hen ;~Lnr(irant <br />~~~~~~,. ~un.liti~m ~i1,ui~.ic ~~ccur~ <br />5.1 Solution M1lining Wells <br />SInCe n0 5olullon nlllling wells will he in operation during a temporary suspension period, it will <br />not he possible to monitor pertinent parameters in association with the mining. Observations will <br />he made of production flow and pressure monitors periodically to confirm temporary suspension <br />status for regulatory compliance and reporting. Once commercial production resumes, solution <br />FINAL: Modification No. 9, i_1IC Area Pern~it No. 0030858-00000 <br />Page 34 of 4G <br />