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EPA's Vessel General Permit and Small Vessel General

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Table 17. Estimated Fish Hold <strong>and</strong> Fish Hold Cleaning Effluent Pollutant Concentrations used in EPAs Biological Evaluation.<br />

Fish Hold Effluent Fish Hold Cleaning Effluent<br />

Pollutant BE Point<br />

Estimate<br />

Detection<br />

Frequency Mean (range) 50th /75 th /90 th<br />

Percentile b<br />

BE Point<br />

Estimate<br />

Detection<br />

Frequency Mean (range) 50th /75 th /90 th<br />

Percentile<br />

Ammonia Nitrogen 12 25/26 12 (nd a -160) 2.1/6.7/160 16 7/9 16 (nd-97) 4.8/18/97<br />

Total Phosphorous 13 25/26 13 (nd-76) 9.7/17/76 8.5 7/9 8.5 (nd-20) 11/17/20<br />

Total Residual Chlorine 0.096 10/26 0.096 (nd-0.3) nc c /0.13/0.3 0.29 6/9 0.29 (nd-1.5) 0.11/0.29/1.5<br />

Total Suspended Solids<br />

(TSS)<br />

210 26/26 210 (10-1100) 130/190/1100 190 9/9 190 (16-460) 84/400/460<br />

Biochemical Oxygen<br />

Dem<strong>and</strong> (BOD)<br />

840 24/26 840 (nd-5100) 440/830/5100 470 6/9 470 (nd-1800) 300/770/1800<br />

Hexane Extractable Oil<br />

<strong>and</strong> Grease (HEM)<br />

Silica Gel Treated-Hexane<br />

3.2 18/26 3.2 (nd-16) 1.5/2.9/16 5.4 6/9 5.4 (nd-28) 1.4/4.2/28<br />

Extractable Oil <strong>and</strong> Grease<br />

(SGT-HEM)<br />

3.4 15/26 3.4 (nd-4.4) 0.98/2.2/4.4 4.9 4/9 4.9 (nd-12) nc/2.8/12<br />

Aluminum (total) 827 24/26 490 (nd-1000) 670/850/1000 1100 9/9<br />

1100 (850-<br />

1700)<br />

930/1500/1700<br />

Arsenic (dissolved) 31 10/26 31 (nd-350) nc/5.7/350 22 5/9 22 (nd-97) 5.3/38/97<br />

Arsenic (total) 40 16/26 40 (nd-380) 4.8/13/380 35 5/9 35 (nd-150) 8.7/64/150<br />

Cadmium (dissolved) 0.77 1/26 0.77 (nd-1.4) nc/nc/1.4<br />

Copper (dissolved) 96 23/26 96 (nd-920) 15/38/920 34 8/9 34 (nd-180) 12/32/180<br />

Lead (dissolved) 0 3/26 2.3 (nd-8) nc/nc/8 2.7 1/9 2.7 (nd-8.7) nc/nc/8.7<br />

Selenium (dissolved) 9.2 6/26 9.2 (nd-61) nc/2.5/61 6 1/9 6 (nd-14) nc/nc/14<br />

Zinc (dissolved) 180 26/26 180 (24-790) 120/240/790 190 8/9 190 (nd-640) 53/420/640<br />

a<br />

Nondetect (censored) concentrations were replaced with ½ of the reporting limit for calculating average concentrations.<br />

b<br />

Percentiles are the concentration below which that percentage of the values fall. So 75 percent of observations occur below the 75th percentile.<br />

c<br />

Distribution statistics were only calculated when analytes were detected at a sufficient frequency.<br />

253

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