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<br /> <br />N <br />~ <br />00 <br />,0 <br /> <br /> <br />report. These sources of information may vary from ambient water quality <br /> <br />monitoring of streams, to specific source monitoring, to "best professional <br /> <br />judgment" expressed by individuals or agencies. <br /> <br />S.P.A. in their gUidance to preparation of thenonpoint source assessment <br />(July 1987) recognizes this situation and defines two levels of assessment as <br /> <br />follow: <br /> <br />n... two levels of'assessment reflecting conclusions based on. ambient <br /> <br />monitoring data and conclusions based on ~ information. One level in <br /> <br />"monitored" waters in whicb. the assessment is based on current <br /> <br />site-spec1f1c ambient data. The other level 1s "evaluated" waters in <br /> <br />which the assessment is based on information other than current <br /> <br />site-spec1fic ambient data, such as data on sources of pollution, <br /> <br />predictive modeling, fishery Surveys, cit1zen complaints and ambient data <br /> <br />whicb. is older than five years. In the NPS area, ~professional <br />judgment and various evaluation techniques, will play an important r9Ie." <br /> <br />Much of the water quality monitoring data used for nonpoint source analysis <br /> <br />was obtained from State and USGS water quality monitoring stations. These <br /> <br />stations are commonly located on second to seventh order stream segments <br /> <br />(larger streams). . The most severe nonpoint source impacts, however,are often <br /> <br />19calized in nature and are most pronounced on smaller first order or higb.er <br /> <br />-42- <br /> <br /> <br />f: <br />~ <br /> <br />;~~ <br />~~~ <br />~;;; <br /> <br />~l1 <br />,{.: <br /> <br />~~ <br />'$ <br />t~ <br /> <br />"$ <br />", <br />1(, <br />?}{: <br /> <br />~ <br />::J:~ <br /> <br />~~ <br /> <br />