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Total Suspended Solids (TSS) <br />BPT guidelines previously contained limitations of 25/45 mg/1 for the 30 <br />day average and dally maximum respectively. However, these limitations have <br />been remanded and presently no technology based limitations exist. .Numerous <br />permits have been written with the 25/45 limitations and compliance with the <br />limitations has not been a problem. <br />In moat cases settling alone is sufficient to provide compliance, although the <br />practice of adding settling agents !s also practiced and has proven co be very <br />successful, yet economical. <br />The SES limitation !s specified in 10.1.4, the 30/45 as the 30 day average <br />and 7 day average respectively. As previously discussed a yell run operation <br />should have little problems complying with these limitations, however the <br />enforcement cost co the state can be significant in obtaining 3 samples in 7 <br />days or 30 days, which is necessary Co demonstrate a violation. Therefore, a <br />60 mg/1 limitation as a dally maximum will also be required. <br />The monitoring frequency for TSS shall be monthly. This is adequate to <br />protect water quality as properly run operations should have no problem in <br />complying with the limitation. <br />O1I and Grease <br />The state efEluenc standard of 10 mg/1 is applicable to all discharges into <br />state waters unless supereeded by a technology based Limitation. Compliance <br />with this limitation is normally demons traced by a visual inspection of the <br />discharge Eor an oil sheen. Conditions of noncompliance have been very <br />infrequent, and should problems occur they will very likely be the result of <br />poor operation or vandalism. <br />The monitoring Frequency Eor this parameter in the permit will be weekly <br />and a visual analysis will be sufficient. Such a Frequency is warranted as a <br />check on operating conditions. <br />E~ <br />The pH range of 6.5-9.0 for WQS, 1s the effluent Limitation appropriate for <br />this permit. Though some stream segments 1n the.scace have a WQS of 6.0-9.0, a <br />sufficient number of screams have the mare stringent Limitation of 6.5-9.0 thus <br />warranting imposition of this limitation. Waters normally encountered in sand <br />and gravel operations are ac a pH of 7.0-8.0, this is substantiated by data <br />submitted in self monitoring reports for existing permits. Natural <br />groundvaters in a Eev locations in the state will not be within these Limlcs <br />and a facility at such a locatioa will very Likely be considered an abnormal <br />operation and therefore required co obtain an individual permit. <br />The monitoring Frequency will be monthly Eor pH, the basis being co crack <br />potential impacts of internal or external activities. .1n exampLe of an <br />external activity of concern 1s a landfill, of which many exist Ln the area of <br />miaing activities around the large municipalities. Ic is Eelc chat the impacts <br />of such activities would be detected with monthly monitoring. Such monitoring <br />is not excessive as a quality pH meter can be obtained Eor under 4100 and <br />calibration plus monitoring can be accomplished in less than 10 minutes. <br />- 4 - <br />