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(h) dissolved chloride; <br />(i) dissolved boron; <br />(j} dissolved barium; <br />(k) dissolved calcium; <br />(1) dissolved magnesium; <br />(m) dissolved sulfate; <br />(n) dissolved fluoride; and <br />(o) dissolved potassium. <br />After the first yeaz of injection, samples maybe taken twice a year except when there is a <br />change of source. If the data collected in the first yeaz demonstrate that some constituents are a[ <br />insignificant levels (below or close to detection level) or are at consistent levels (less than 10% <br />variation between samples), the operator may request a minor modification to modify the sampling <br />requirements to eliminate or reduce the sampling for specific items. <br />For measuring fluid volume and rate, the instrumentation shall be capable of recording at <br />least one value for each of the parameters above every one minute. Initially, recordings shall be <br />made once every 10 minutes. Monitoring must be carried out whether or not fluids are being <br />injected. This information shall be analyzed in the first annual report to determine if this <br />frequency is representative of the injection activity. A minor modification to the Permit shall be <br />made to increase the frequency of recording if the variability of the injection volume and rate (as <br />warranted by the data results) affects the representative nature of the data. A minor modification - <br />to the Permit may be made to decrease the frequency of recording if the Director detemunes that <br />the fluctuation of the parameters is such that Less frequent data collection would not significantly <br />affect the representative nature of the reported data. <br />For continuous monitoring of the injection and tubing/casing annulus pressure, the <br />instrumentation shall be capable of recording at least one value for each of the pazameters above <br />every 15 seconds. Initially, recordings should be made once every ten minutes. Monitoring must <br />be carried out whether or not fluids are being injected. This information shall be analyzed in the <br />first annual report to determine if this frequency is representative of the injection activity. A minor <br />modification to the Permit shall be made to increase the frequency of recording if the variability of <br />the injection pressure and annulus (as warranted by the data results) affects the representative <br />nature of the data. A minor modification to the Permit may be made to decrease the frequency of <br />recording if the Director determines that the fluctuation of the pazameters is such that less frequent <br />data collection would not significantly affect the representative nature of the reported data. <br />Statement of Basis for EPA Permit No. CO 1O93Z-04664 Page 14 of 18 <br />