THIS TABLE SUMMARIZES THE DESCRIPTION OF THE FIELDS IN THE PARAMETER CODE FILE.
                                 STORET
   CHARACTER
POSITION COLUMN      FIELD      FIELD NAME         NUMBER OF CHARACTERS
________________________________________________________________________

      1-2              01      GROUP CODE                   2
       3               02      SAMPLE MEDIA                 1
       4               03      ANALYSIS TYPE                1
       5               04      REPORTING UNITS              1
       6               05      PRIORITY POLLUTANT           1
       7               19      TOXIC EXTRACTION             1
       8               06      PUBLISH OR TOXIC             1
       9               20      SUB GROUP CODE               1
     10-14             21      PARAMETER NO.                5
      15               07      DECIMAL POINT                1
     16-39             08      SHORT NAME                  24
     40-89             09      FULL NAME                   50
     90-93             10      ENTRY DATE                   4
     94-101            11      ORIGIN OF REQUEST            8
    102-105            12      REVISION DATE                4
      106              13      TRACKING CODE                1
    107-115            14      CAS NO.                      9
    116-122 *          15      TOTAL OBSERVATIONS           7
    124-126 *          16      PERCENTS 1972-77             3
    127-129 *          17      PERCENTS 1967-71             3
    130-132 *          18      PERCENTS PRE 1967            3


 * These fields should be ignored. The information is obsolete.
________________________________________________________________________

     GROUP FIELD (FIELD 01) HAS TWO CHARACTERS. THE TWO DIGIT
GROUP CODES ARE AS FOLLOWS:

     GROUP CODE 01 - ADMINISTRATIVE
     GROUP CODE 02 - BACTERIOLOGICAL
     GROUP CODE 03 - BIOLOGICAL
     GROUP CODE 04 - DISSOLVED OXYGEN
     GROUP CODE 05 - FLOW
     GROUP CODE 06 - GENERAL INORGANIC
     GROUP CODE 07 - GENERAL ORGANIC
     GROUP CODE 08 - METAL
     GROUP CODE 09 - NITROGEN
     GROUP CODE 10 - OXYGEN DEMAND
     GROUP CODE 11 - PESTICIDE
     GROUP CODE 12 - PHOSPHORUS
     GROUP CODE 13 - PHYSICAL
     GROUP CODE 14 - RADIOLOGICAL
     GROUP CODE 15 - SOLID
     GROUP CODE 16 - TEMPERATURE
     GROUP CODE 17 - MISCELLANEOUS
     GROUP CODE 18 - OTHER

     GROUP CODE 15 - SOLIDS WILL CONTAIN SEDIMENTS, STREET DEBRIS,
AND DRY DEPOSITION.  THOSE WILL BE FURTHER DIFFERENTIATED ON THEIR
SAMPLE MEDIA CODES, S AND D, RESPECTIVELY.

     GROUP CODE 18 - MEASUREMENTS ON THE DEPTH, WIDTH, AND HEIGHT OF
A SAMPLE LOCATION, AS IN A RIVER, RESERVOIR, STREAM BED, AIR COLUMN,
WILL BE PLACED IN THIS GROUP.

     SAMPLE MEDIA FIELD (FIELD 02) HAS ONE CHARACTER. THE ONE DIGIT
SAMPLE MEDIA CODES ARE AS FOLLOWS:

     W - WATER
     T - TISSUE
     S - SEDIMENT
     A - AIR
     D - SLUDGE
     M - METEOROLOGICAL
     E - EFFLUENT AND INFLUENT
     L - LAND
     F - FOOD
     O - OTHER

     ANALYSIS TYPE FIELD (FIELD 03) HAS ONE CHARACTER.  THE ONE DIGIT
ANALYSIS TYPE CODES ARE AS FOLLOWS:

     1 - TOTAL      =
     2 - DISSOLVED  =                  WATER (W) MEDIA RELATED
     3 - SUSPENDED  =

     4 - WET        =
     5 - DRY        =                  TISSUE (T) MEDIA RELATED
     6 - FAT        =

     1-9 - SEE EXPLANATION FOLLOWING   SEDIMENT (S) MEDIA RELATED

     1 - TOTAL      =
     2 - DISSOLVED  =                  AIR (A) MEDIA RELATED
     3 - SUSPENDED  =

     1 - TOTAL      =
     2 - LIQUID     =                  SLUDGE (D) MEDIA RELATED
     3 - SOLID      =





     THE FOLLOWING IS A DETAILED EXPLANATION OF SAMPLE MEDIA AND ITS
RELATED ANALYSIS TYPE CODE:

     WATER (W) MEDIA AND RELATED ANALYSIS TYPE:

     1 - TOTAL (MEASURES BOTH DISSOLVED AND SUSPENDED)
     2 - DISSOLVED (MEASURES ONLY DISSOLVED PORTION)
     3 - SUSPENDED (MEASURES ONLY SUSPENDED PORTION)

     TISSUE (T) MEDIA AND RELATED ANALYSIS TYPE:

     4 - WET (PARAMETERS ARE REFERRED TO AS WET WEIGHT)
     5 - DRY (PARAMETERS ARE REFERRED TO AS DRY WEIGHT)
     6 - FAT (SOME POLLUTANTS ARE SOLUBLE ONLY IN FATS)

     SEDIMENT (S) MEDIA CONTAINS MANY TYPES OF ANALYSES DESCRIBED AS
     FOLLOWS:

     1.  TOTAL SEDIMENT, PARTICLE SIZE
     2.  BEDLOAD SEDIMENT, SIEVE DIAMETER
     3.  SUSPENDED SEDIMENT, SIEVE DIAMETER
     4.  TOTAL SEDIMENT, SIEVE DIAMETER/OR WET WEIGHT ANALYSES
     5.  TOTAL SEDIMENT, FALL DIAMETER (DISTILLED WATER)/OR DRY
         WEIGHT ANALYSES
     6.  TOTAL SEDIMENT, FALL DIAMETER (NATIVE WATER)
     7.  SUSPENDED SEDIMENT, FALL DIAMETER (DISTILLED WATER)
     8.  SUSPENDED SEDIMENT, FALL DIAMETER (NATIVE WATER)
     9.  BED MATERIAL, FALL DIAMETER

     ALL OF THESE CODES WILL BE FOUND WITH A GROUP CODE OF 15 (SOLIDS).

     NOTE:  THERE SHOULD BE NO CONFUSION AS TO THE SAME NUMERAL BEING
USED FOR DIFFERENT ANALYSIS TYPES (FIELD 03) BECAUSE EACH ANALYSIS TYPE
IS TO BE READ WITH RESPECT TO THE SAMPLE MEDIA ALPHA CHARACTER THAT
ACCOMPANIES IT.

     AIR (A) MEDIA AND RELATED ANALYSIS TYPE:

     1 - TOTAL (MEASURES DISSOLVED AND SUSPENDED)
     2 - DISSOLVED (MEASURES ONLY DISSOLVED PORTION)
     3 - SUSPENDED (MEASURES ONLY SUSPENDED PORTION)

     SLUDGE (D) MEDIA AND RELATED ANALYSIS TYPE:

     1 - TOTAL (MEASURES SOLID AND LIQUID FRACTIONS)
     2 - LIQUID FRACTION ONLY
     3 - SOLID FRACTION ONLY

     NOTE:  SLUDGE (D) AND SEDIMENT (S) ARE TO BE TREATED SEPARATELY
AS MEDIA TYPES; SEDIMENT USUALLY REFERS TO PARTICULATE MATTER (SANDS,
SILTS, CLAYS) SETTLED IN A RIVER OR STREAM BED OR SUSPENDED IN THE RIVER
OR STREAM.

     METEOROLOGICAL (M) SAMPLE MEDIA REFERS TO WEATHER RELATED
PARAMETERS; EXAMPLES ARE BELOW:

     CLOUD COVER
     WIND SPEED
     HUMIDITY
     BAROMETRIC PRESSURE

     NOTE THAT AIR (A) IS RESERVED FOR MEASUREMENTS TAKEN ON POLLUTANTS
IN THE ATMOSPHERE.

     EFFLUENT AND INFLUENT (E) SAMPLE MEDIA REFERS TO POLLUTANT
MEASUREMENTS TAKEN ON INDUSTRIAL AND MUNICIPAL WASTE STREAMS.

     LAND (L) REFERS TO POLLUTANT ANALYSES ON SOILS, ET AL.

     FOOD (F) REFERS TO POLLUTANT ANALYSES OF FOODS.

     OTHER (O)


Reporting Units Field (Field 04) has no character.  The one digit
reporting units codes are as follows:

A - mg/l                            O - %, percent
B - ug/l                            P - no units, code, ratio, etc.
C - mg/kg (ug/g)                    Q - time: day, mo, yr, sec, min, hr
D - ug/kg                           R - mmHg
E - #/100ml (no./100ml)             S - pH
    (cells/100ml)                   T - pc/gm
F - #/ml (no./ml)                   U - no/sq ft
    (cells/ml)                      V - #/day (lb/day), lb/yr
G - #/liter (cell/liter)            W - #/effort
H - degrees C                       X - production: ton, ton/day
I - distance                            Kg/1000gal
J - degrees F                       Y - wt. measurement
K - CFS                             Z - "catch all"
L - gpm, gpd, or mgd
M - pc/1
N - MPN

PRIORITY POLLUTANT FIELD (FIELD 05) HAS ONE CHARACTER.  THE ONE DIGIT
PPL CODE IS:

I - INDICATES THAT THE PARAMETER WAS IDENTIFIED AS A
    PRIORITY POLLUTANT.

PUBLISH FIELD (FIELD 06) HAS ONE CHARACTER.  THE ONE DIGIT PUBLISH
CODES ARE:

     T - DESIGNATED TOXIC PARAMETER
     X - RESTRICTED USE

DECIMAL POINT FIELD (FIELD 07) HAS ONE CHARACTER.  THE ONE DIGIT
DECIMAL POINT CODES ARE:

     1 - XXXXXXX.
     2 - XXXXXX.X
     3 - XXXXX.XX
     4 - XXXX.XXX
     5 - XXX.XXXX
     6 - XX.XXXXX
     7 - X.XXXXXX

SHORT NAME FIELD (FIELD 08) HAS TWENTY-FOUR CHARACTERS.  (SEE ITEM
VII A).

FULL NAME FIELD (FIELD 09) HAS FIFTY CHARACTERS.  (SEE ITEM VII B).

ENTRY DATE FIELD (FIELD 10) HAS FOUR CHARACTERS.  THIS FIELD CONTAINS
INFORMATION THAT PERTAINS TO WHEN THE PARAMETER WAS ENTERED INTO THE
STORET SYSTEM.  FOR EXAMPLE, IF THE PARAMETER WAS ENTERED INTO STORET
IN JUNE OF 1978 THE CODING WOULD BE 7806 (I.E.. YYMM).

ORIGIN OF REQUEST FIELD (FIELD 11) HAS EIGHT CHARACTERS, AND THE
INFORMATION IS CODED IN WITH LEFT JUSTIFICATION.  THE ORIGIN LOCATION
FIELD HAS TWO PORTIONS:  MAJOR CATEGORY AND MINOR CATEGORY. THE TWO
CATEGORIES ARE SEPARATED BY A HYPHEN.

MAJOR CATEGORY

S - STATE AGENCY
F - FEDERAL AGENCY OR DEPARTMENT OTHER THAN EPA
I - INTERSTATE AGENCY
E - ENVIRONMENTAL PROTECTION AGENCY, INCLUDING ITS PREDECESSOR
    AGENCIES, SUCH AS PUBLIC HEALTH SERVICE, FEDERAL POLLUTION CONTROL
    ADMINISTRATION, FEDERAL WATER QUALITY ADMINISTRATION.

MINOR CATEGORY

ABBREVIATIONS FOLLOWING THE MAJOR CATEGORY INDICATES THE SPECIFIC USER.

STATES - BY STATE ABBREVIATION (I.E., S - VA INDICATES STATE OF
         VIRGINIA)
FEDERAL - BY SPECIFIC AGENCY SUCH AS:

     FS  - FOREST SERVICE
     GS  - U.S. GEOLOGICAL SURVEY
     COE - CORPS OF ENGINEERS
     BR  - BUREAU OF RECLAMATION
     TVA - TENNESSEE VALLEY AUTHORITY
     AF  - AIR FORCE
     BM  - BUREAU OF MINES

INTERSTATE - BY ACRONYM

     INCOPOT - INTERSTATE COMMISSION FOR THE POTOMAC RIVER BASIN
     ORSANCO - OHIO RIVER VALLEY SANITATION COMMISSION
     DRBC    - DELAWARE RIVER BASIN COMMISSION

EPA - BY THE SPECIFIC PART OF THE ENVIRONMENT PROTECTION AGENCY.

     R01 - REGION I
     R02 - REGION II
     R03 - REGION III
     R04 - REGION IV
     R05 - REGION V
     R06 - REGION VI
     R07 - REGION VII
     R08 - REGION VIII
     R09 - REGION IX
     R10 - REGION X
     ENF - OFFICE OF ENFORCEMENT
     ORD - OFFICE OF RESEARCH AND DEVELOPMENT
     HQ  - HEADQUARTERS

     E   - STORET INDICATES THE PARAMETER WAS IN THE ORIGINAL GROUP
           USED TO START THE STORET DATA STORAGE FILE.


REVISION DATE FIELD (FIELD 12) HAS FOUR CHARACTERS.  THIS FIELD
CONTAINS INFORMATION THAT PERTAINS TO WHEN THE PARAMETER WAS REVISED.
FOR EXAMPLE, IF A REVISION WAS MADE TO A PARAMETER IN STORET IN JULY
OF 1978, THE CODING WOULD BE 7807 (I.E., YYMM).

TRACKING CODE FIELD (FIELD 13) HAS ONE CHARACTER.  THE ONE DIGIT
TRACKING CODES ARE AS FOLLOWS:

* - CORRECT PARAMETER - ADDITIONS AND/OR CORRECTIONS HAVE BEEN MADE TO
THE PARAMETER AND IT IS IN NEED OF NO FURTHER ACTION.

+ - A CORRECT PARAMETER THAT WAS PLACED IN STORET AS ONE OF THE
ORIGINAL ENTRIES PRIOR TO JULY 1966, USUALLY ASSIGNED AN ENTRY DATE
(FIELD 10) OF 6507, AND AN ORIGIN OF REQUEST CODE (FIELD 11) OF
E-STORET.  THIS PARAMETER NEEDS NO FURTHER ACTION.

CAS NUMBER FIELD (FIELD 14) HAS NINE CHARACTERS, AND THE INFORMATION
IS CODED IN WITH RIGHT JUSTIFICATION.  THE CHEMICAL ABSTRACTS SERVICE
REGISTRY NUMBER (CAS NUMBER) IS A UNIQUE NUMBER THAT EXISTS FOR EVERY
ELEMENT AND COMPOUND.  THE CAS NUMBER CAN HAVE UP TO NINE DIGITS.

TOXIC EXTRACTION CODE (FIELD 19) HAS ONE CHARACTER.  THIS CODE
INDICATES THE TYPE OF EXTRACTION THAT THE TOXIC PARAMETERS ARE
DETECTED IN, SUCH AS:

     V - VOLATILES
     A - SEMI-VOLATILES - ACID EXTRACTABLE
     B - SEMI-VOLATILES - BASE - NEUTRAL EXTRACTABLE
     O - ORGANOHALIDES - HEXANE EXTRACTION

SUB GROUP CODE FIELD (FIELD 20) HAS ONE CHARACTER.  THIS CODE INDI-
CATES THE SUBGROUP TO WHICH THE TOXIC PARAMETERS BELONG, SUCH AS:

     P - PCB'S AND RELATED COMPOUNDS
     H - HALOGENATED ALIPHATICS
     E - ETHERS
     M - MONOCYCLIC AROMATICS (EXCLUDING PHENOLS, CRESOLS, AND
         PHTHALATES)
     C - PHENOLS AND CRESOLS
     T - PHTHALATE ESTERS
     L - PLOYCYCLIC AROMATIC HYDROCARBONS
     N - NITROSAMINES AND OTHER NITROGEN CONTAINING COMPOUNDS

