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arsenic monthly grab <br /> barium monthly grab <br /> cadmium monthly grab <br /> chromium monthly grab <br /> fluoride monthly. grab . <br /> lead monthly grab <br /> mercury monthly grab <br /> nitrate monthly grab <br /> selenium monthly grab <br /> silver monthly grab <br /> sodium monthly grab <br /> calcium monthly grab <br /> magnesium monthly grab <br /> carbonate monthly grab <br /> bicarbonate monthly grab <br /> chloride monthly grab <br /> sulfate monthly grab <br /> sulfite monthly grab <br /> iron monthly grab <br /> potassium monthly grab <br /> endrin monthly* grab <br /> lindane monthly* grab <br /> methoxychlor monthly* grab <br /> toxaphene monthly* grab <br /> 2 , 4 - D monthly* grab <br /> 2 , 4 , 5 - TP silvex monthly* grab <br /> * Compounds designated by an asterisk will be sampled monthly <br /> during the first year of operation. If a compound so designated <br /> is not detected during any of the initial twelve monthly samples, <br /> monitoring frequency may be decreased to once per year. Monitor- <br /> ing will return to monthly frequency if the compound is detected <br /> anytime thereafter, or if so directed in writing by EPA. <br /> Monitoring will continue at monthly intervals for at least <br /> another one year period of nondetectable levels before the per- <br /> mittee may again request a return to yearly monitoring. <br /> 3 . Injection fluid monitoring data <br /> Monitoring <br /> Parameter Frequency Sample Type <br /> injection rate, gpm continuous recorder <br /> injection total volume, gallons continuous totalizer <br /> injection pressure, psig continuous recorder <br /> annular pressure, psig continuous recorder <br /> annular volume, gallons continuous recorder <br /> injection fluid temperature continuous recorder <br /> 4. continuous monitoring devices [§146. 13 (b) (2) ] <br /> 16 <br />