25. Suspended-solids concentrations for selected waterquality zones, by year: A. Chowan River zone CH7, B. Perquimans River zone PQ1, and C. Pasquotank River zone PS1 .

Water and bottom-sediment samples were collected from April 1986 to September 1987 at 19 sites in Guilford County and the City of Greensboro, North Carolina. Sampling locations included 13 stream sites, two lakes that supply City of Greensboro drinking water, two City of Greensboro finished drinking-water filtration plants, and two municipal wastewater plants where effluents were sampled prior to outfall into the receiving streams. Water sampling consisted of six routine samplings during various stages of steady flow at all sites, and rainfall-event sampling during two storms at six sites. Bottom-sediment samples were collected at three sites during two routine samplings.Samples were analyzed for trace-element, major ion, and nutrient concentrations, as well as general water-quality indicators, such as pH, dissolved oxygen, and specific conductivity. Concentrations of acid and base/neutral extractable, volatile organic compounds, and organochlorine and organophosphorus constituents were also determined. Chromatographs from organic analyses were submitted to computerized library searches, the results of which are included in this report. Results from all analyses are presented in tabular form in the appendices.

AAS-atomic absorption spectrometry AE-atomic emission EOT MAT-bottom material CFSM-cubic foot per second per square mile COD-chemical oxygen demand DC-direct current DEG C-degrees Celsius DIS-dissolved FET-fixed end point titration FIB-fibers FLD-field GC/FID-gas chromatograph/flame ionization detector GC/MS-gas chromatograph/mass spectrometer HPLC-high-performance liquid chromatography 1C-ion chromatography ICP-inductively coupled plasma INST-instantaneous IT-incremental titration MAX-maximum MG/L (mg/L)-milligram per liter MG/KG (mg/kg)-milligram per kilogram MIN (min)-minimum ML (mL)-milliliter MM (mm)-millimeter MM OF HG (mm of hg)-millimeters of mercury NA-not available NBS-National Bureau of Standards NONCARB-noncarbonate NTU-nephelometric turbidity unit PCB-polychlorinated biphenyl pCi/L-picocurie per liter PCN-polychlorinated naphthalene SQ. MI.-square mile THMFP-trihalomethane formation potential TOT-total TOC-total organic carbon M-g/g-microgram per gram jig/kg-microgram per kilogram M-g/L-microgram per liter \i.m-micrometer |a.S/cm-microsiemen per centimeter USGS-U.S. Geological Survey VOC-volatile organic compound WAT-water WATSTORE-Water Data Storage and Retrieval System WH-whole WY-water year (determined by the calendar year in which the period October 1 through September 30 ends) IX Any use of trade, product/ or firm names in this report is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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