Documentation for County Point Source File
 U.S. Geological Survey

 Contact:  Richard Alexander (email: ralex@usgs.gov)
           U.S. Geological Survey
           Reston, VA  20192

 Documentation Last Updated:  02/05/98

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   Resources for the Future (RFF) Point-Source Data Inventory:
         
         Gianessi, L.P. and H.M. Peskin, An Overview of the RFF
         Environmental Data Inventory:  Methods, Sources, and
         Preliminary Results, Vol. 1, September, 1984,
         Resources for the Future, Washington, D.C., 111 p.

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   Method Summary: 

         Point-source estimates are based on a national inventory 
         of discharges from 32,000 facilities, including
         industries, municipal wastewater treatment plants, and
         small sanitary waste dischargers for the years 1977-1981.
         This inventory represents the most recent nationally
         comprehensive compilation of point-source discharges
         for the reported chemicals.

         The original units of the RFF data were converted from
         daily to annual estimates.  The number of days of
         discharge were assumed to be 365 for municipal treatment
         plants and 260 for industries.

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   Constituents (variable name):

         Flow (FLOW), 5-day biochemical oxygen demand (BOD5),
         total suspended solids (TSS), chemical oxygen demand
         (COD), total kjeldahl nitrogen (TKN), total phosphorus
         (TOT-P), trace elements (CADMIUM, CHROMIUM, COPPER,
         LEAD, ARSENIC, IRON, MERCURY, ZINC), oil and grease
         (OIL), polychlorinated biphenyls (PCB), chlorinated
         hydrocarbons (CHLORINATED-HC), and fecal coliforms
         (FECAL-COLIFORM)

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   Geographic Identifiers:

         All records are identified by the state-county FIPS
         code.  State abbreviations and county names corresponding
         to this code are provided in the file 'fips_nam.txt'.


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   File Layout:
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 Municipal point source discharges
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 File Name:  POINTM1.TXT     (3,134 county records)
 Contents: (each field is separated by a blank)
   Item                 Width Type N.Dec. Units

   FIPS                5    5  I    -
   FLOW                4   14  F    2    billion gal./yr
   BOD5                4   14  F    2    1,000 lbs/year
   TSS                 4   14  F    2       "
   COD                 4   14  F    2       "
   TKN                 4   14  F    2       "
   TOT-P               4   14  F    2       "
   CADMIUM             4   14  F    2       "
   CHROMIUM            4   14  F    2       "
   COPPER              4   14  F    2       "

 File Name:  POINTM2.TXT
 Contents: (each field is separated by a blank)
   Item                 Width Type N.Dec.

   FIPS                5    5  I    -
   LEAD                4   14  F    2    1,000 lbs/year
   ARSENIC             4   14  F    2       "
   IRON                4   14  F    2       "
   MERCURY             4   14  F    2       "
   ZINC                4   14  F    2       "
   OIL                 4   14  F    2       "
   PCB                 4   14  F    2       "
   CHLORINATED-HC      4   14  F    2       "
   FECAL-COLIFORM      4   14  F    2  1.0 e+12 coliform counts/yr


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 Industrial point source discharges
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 File Name:  POINTI1.TXT     (3,134 county records)
 Contents: (each field is separated by a blank)
   Item                 Width Type N.Dec. Units

   FIPS                5    5  I    -
   FLOW                4   16  F    4    billion gal./yr
   BOD5                4   16  F    4    1,000 lbs/year
   TSS                 4   16  F    4       "
   COD                 4   16  F    4       "
   TKN                 4   16  F    4       "
   TOT-P               4   16  F    4       "
   CADMIUM             4   16  F    4       "
   CHROMIUM            4   16  F    4       "
   COPPER              4   16  F    4       "

 File Name:  POINTI2.TXT
 Contents: (each field is separated by a blank)
   Item                 Width Type N.Dec.

   FIPS                5    5  I    -
   LEAD                4   16  F    4    1,000 lbs/year
   ARSENIC             4   16  F    4       "
   IRON                4   16  F    4       "
   MERCURY             4   16  F    4       "
   ZINC                4   16  F    4       "
   OIL                 4   16  F    4       "
   PCB                 4   16  F    4       "
   CHLORINATED-HC      4   16  F    4       "
   FECAL-COLIFORM      4   16  F    4  1.0 e+12 coliform counts/yr
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