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UniFirst Corporation <br />Self -Monitoring Sample Program <br />Page 2 of 4 <br />Sample <br />irmax <br />Parameter <br />le <br />Sample <br />Sam le <br />P <br />Location <br />(1)Instantaneous maximum <br />Frequency <br />Type <br />diagram <br />(2)Daily maximum <br />attached <br />(3)Monthly maximum <br />Copper <br />1 per month <br />24 hour flow proportional <br />B <br />6.0 mg/L — (2) local limit <br />composite, representative <br />of reporting period <br />Lead <br />1 per month <br />24 hour flow proportional <br />B <br />2.0 mg/L — (2) local limit <br />composite, representative <br />of reporting period <br />Nickel <br />1 per month <br />24 hour flow proportional <br />B <br />5.0 mg/L — (2) local limit <br />composite, representative <br />of reporting period <br />Zinc <br />1 per month <br />24 hour flow proportional <br />B <br />7.0 mg/L — (2) local limit <br />composite, representative <br />of reporting period <br />Cadmium <br />1 per 6 months <br />Grab, well mixed and <br />C <br />2.0 mg/L— (1) local limit <br />representative of sampling <br />day and reporting period. <br />Chromium <br />1 per 6 months <br />Grab, well mixed and <br />C <br />5.0 mg/L— (1) local limit <br />representative of sampling <br />day and reporting period. <br />Copper <br />1 per 6 months <br />Grab, well mixed and <br />C <br />6.0 mg/L— (1) local limit <br />representative of sampling <br />day and reporting period. <br />Lead <br />1 per 6 months <br />Grab, well mixed and <br />C <br />2.0 mg/L — (1) local limit <br />representative of sampling <br />day and reporting period. <br />Nickel <br />1 per 6 months <br />Grab, well mixed and <br />C <br />5.0 mg/L — (1) local limit <br />representative of sampling <br />day and reporting period. <br />Zinc <br />1 per 6 months <br />Grab, well mixed and <br />C <br />7.0 mg/L— (1) local limit <br />representative of sampling <br />day and reporting period. <br />Mercury <br />1 per 6 months <br />Grab, well mixed and <br />C <br />0.1 mg/L — (1) local limit <br />representative of sampling <br />day and reporting period. <br />Silver <br />1 per 6 months <br />Grab, well mixed and <br />C <br />1.5 mg/L — (1) local limit <br />representative of sampling <br />day and reporting period. <br />Arsenic <br />1 per 6 months <br />Grab, well mixed and <br />C <br />6.0 mg/L — (1) local limit <br />representative of sampling <br />day and reporting period. <br />Cyanide, Total <br />1 per 6 months <br />Grab, well mixed and <br />C <br />4.0 mg/L — (1) local limit <br />representative of sampling <br />day and reporting period <br />