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Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

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Non-mining MSGP 2010 General Permit<br />

Benchmark values based on hardness and receiving waterbody<br />

Water Hardness Range<br />

(mg/L)<br />

For discharges to<br />

perennial and<br />

intermittent<br />

waterbodies<br />

Zinc<br />

(mg/L)<br />

For discharges<br />

to ephemeral<br />

waterbodies<br />

Zinc<br />

(mg/L)<br />

0-25 0.0362 0.344<br />

25-50 0.0651 0.618<br />

50-75 0.0918 0.871<br />

75-100 0.1170 1.112<br />

100-125 0.1417 1.343<br />

125-150 0.1652 1.568<br />

150-175 0.1883 1.787<br />

175-200 0.2108 2.001<br />

200-225 0.2329 2.211<br />

225-250 0.2547 2.417<br />

250-275 0.2761 2.620<br />

275-300 0.2972 2.821<br />

300-325 0.3181 3.019<br />

325-350 0.3387 3.214<br />

350-375 0.3591 3.408<br />

375-400 0.3793 3.599<br />

<strong>Stormwater</strong> Discharges Associated with Industrial Activity – Sector AA 92

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