WATER QUALITY SURVEY

                                           OF THE

                                      POTOMAC ESTUARY

                                  EMBAYMENTS AND TRANSECTS


                                            1970
                                         DATA REPORT

                                          Number 28
ATLANTIC REGION- ft?   6th and Walnut Streets. Philadelphia, Pennsylvania 19106

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                                  Annapolis Field  Office

I                                         Region  III

                              Environmental Protection Agency
                                      1970 Data Report




                                         Number 28
                                   WATER QUALITY  SURVEY



                                           OF  THE



                                       POTOMAC ESTUARY



                                 EMBAYMENTS AND TRANSECTS
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                                           Staff:

•                  James W.  Marks, Chief, Analytical Laboratory Section
                  Orterio Villa, Jr., Chief, Development Laboratory Section
I                               Anna R. Favorite, Statistician
                               Evelyn P. McPherson, Technician



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                                      TABLE OF CONTENTS
                                                                   Page
                  I  INTRODUCTION .................................  1
I               II  STATION LOCATIONS ............................  6
m              III  SURVEY  RESULTS ...............................  9
                 IV  MAP .................................. appendix  i

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                                        I INTRODUCTION
                 A.    Purpose  and Scope

  •                   During 1970, water  quality studies were  continued by  the

                 Annapolis  Field  Office,  Region  III,  Environmental  Protection

  B              Agency in  the Potomac  estuary watershed.   Purpose  of  these

  g|              surveys was to determine existing water quality. The results


                 of  these investigations  are presented  in  this report.
                B.   General Remarks


                     Transect  stations were  sampled during February and March.


 |             Mid-channel samples only were  taken using stations that had


 —             previously been transected.  Also included in this report are


 *             selected embayments sampled  from February to July.  Nutrient


 •             as well as dissolved oxygen, carbon and chlorophyll a anal-


                yses were made by the Annapolis Field Office.


 •             C.   Sampling Procedures


 —                  Samples were obtained using a small submersible pump at-


 ™             tached to a wire cable calibrated in feet.  The pump was

 •             lowered to the desired depth and allowed to run for two min-


                utes before receiving samples  in plastic containers. Dissolved


 •             oxygen (DO) samples were obtained directly from the pump out-


                let extending to the bottom  of a conventional 300 ml DO bottle.
               The  sample  was  allowed to  overflow the  bottle  several  times


               and  fixed.  All samples were  immediately stored on ice and

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               analyses started upon return to the laboratory, generally
•             within two hours of sampling.
               D.   Measured Parameters and Analytical Methods
|                  1.   Water temperature was read from a Beckman Salin-
—             ometer.
™                  2.   Light extinction, in inches, was made with a 12"
flj             (30 cm) white secchi disk.
                    3.   Conductivity was read from a calibrated Beckman
•             Salinometer.
                    It.   Salinity was determined with a calibrated Beckman
•             Salinometer.
•                  5.   Total phosphorus
                         Reference:  Menzel, D.W. and Corwin, N. , 1965.  The
•
               Measurement of Total Phosphorus in Seawater Based on the Lib-
               eration of Organically Bound Fractions by Persulfate Oxidation.
               Limonology and Oceanography, 10:  280-282.
                         Murphy, J. and Riley, J.P., 1962.  A Modified Single
               Solution Method for the Determination of Phosphate in Natural
 •             Waters.  Analytica Chimica Acta, 2?:  31-36.
                         Total Phosphorus was determined after persulfate
 f             oxidation of the sample in an autoclave at 15> psi for 30
 —             minutes.  The resultant ortho-phosphate was then determined
 *             colorimetrically as the molybdenum-blue complex with the op-
 fl             tical density measured at 882 iti(j,.

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™                 6.    Inorganic Phosphorus
•                      Reference:  Murphy, J. and Riley, J.P., 1962.  A
              Modified Single Solution Method for the Determination of Phos-
•            phate in Natural Waters.  Analytica Chimica Acta, 27:  31-36.
                        Inorganic Phosphorus was determined by automation
™            of the above procedure using the Technicon "Auto Analyzer."
•            The molybdenum-blue complex formed was determined colorimet-
              rically with the optical density measured at 88f> mp,.
I                 7.    Total Kjeldahl Nitrogen
                        Reference:  Standard Methods for the Examination of
 •            Water and Wastewater, 12 ed., 1965.
 g|                      Total Kjeldahl Nitrogen includes ammonia and organ-
              ic nitrogen and was determined by the standard micro-kjeldahl
 •            procedure.  The sample was digested in the presence of strong
              acid to convert the organic nitrogen to ammonia.  The ammonia
 |            was then distilled, collected in boric acid solution, nessler-
 m            ized and determined colorimetrically.
                   8.    Nitrate + Nitrite
 •                      Reference:  A Practical Handbook of Sea Water Analysis,
              J.D.H. Strickland and T.R. Parsons, Bulletin 167, Fisheries
 0           Research Board of Canada, Ottawa, Canada, 1968.
 M                     Nitrate plus nitrite nitrogen was determined by auto-
              mation of the above procedure using the Technicon "Auto Analป
 •           yzer."  This procedure utilizes cadmium reduction of nitrate

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                 to nitrite  and  subsequent  diazotization with sulfanilamide
•               and N-(l-naphthyl)-ethylenediamine  dihydrochloride with the
                 optical  density measured at  5kO mn.   The  results  were  report-
V               ed as  nitrogen.
m                   9.   Ammonia
                          Reference:   Southeast Water Laboratory, FWQA,
•               Methodology for the  colorimetric  determination of ammonia
                 by the phenol-hypochlorite reaction.
|                        FWPCA Methods for  Chemical  Analysis of  Water and
M               Wastes,  November 1969.
                          Ammonia  nitrogen was determined by automation of
•               the phenol-hypochlorite procedure as  described in the  South-
                 east Water  Laboratory  Methodology and later  adopted  as the
||               official FWPCA  procedure.  The intensity  of  the indophenol
_               blue color,  formed by  the  reaction  of ammonia with alkaline
•               phenol-hypochlorite, was increased  using  sodium nitropruss^de
•               as an  intensifying agent.  The optical density was measured
                 at 630 mn and calculated as  NHo-N.
•                   10.  Dissolved  Oxygen
                          Reference:   FWPCA  Methods for Chemical  Analysis of
•               Water  and Wastes,  November 1969.
•                        Dissolved  Oxygen was determined by the  azide modi-
                 fication of the basic Winkler method  with the titration done
•               potentiometrically with a  Fisher  automatic "titralyzer."

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                     11.   Total Organic Carbon
•                        Reference:   FWPCA Methods for Chemical Analysis of
                Water and Wastes,  November 1969.
•                        Total Organic Carbon was determined with a Dow-
                Beckman Carbonaceous Analyzer after the sample had been purged
•              with nitrogen gas for five minutes.
•                   12.   Total Carbon
                          Reference:   Beckman Instruments, Bulletin lj.059.
•                        Total Carbon was determined with a Dow-Beckman
                Carbonaceous Analyzer using the sample as received.
I                   13.   Chlorophyll a
m                        Reference:   A Practical Handbook of Sea Water Anal-
                ysis, J.D.H. Strickland and T.R.  Parsons, Bulletin 16?, Fish-
•              eries Research Board of Canada, Ottawa, Canada.  1968.
                          Chlorophyll a. was determined by extraction of milli-
|              pore filtered samples in 90$ acetone and read spectrophoto-
ซ              metrically.

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                                    II STATION LOCATIONS

               Transect Station       Location
I                     7              Piscataway  "77"

•                     8              Dogue Creek Fl "67"

g                     8A             Gunston Cove Fl  "6U"

                       9              Hallowing Point  Fl  "59"

                      10              Indian Head N "ฃU"

                      10A             Occoquan Bay Fl  "5l"

•                    11              Possum Point Fl  "iUt"

|                    12              Sandy Point N "UO"


I                    13              Smith Point Fl "27"

•                    lU              Maryland Point Fl "21"

•                    15              Nanjemoy Creek N "10"

                                      Port Tobacco C "3"
—
                      16              301 Bridge
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Embayment Station Location
7 1 Piscataway Creek, headwaters
7 2 It II
73 " " , mouth
7 MC Potomac Fl "77"
8 1 Dogue Creek, above boathouse
82 " " , opposite boathouse
83 " " , midway boathouse and Fl "67"
8 MC Potomac Fl "67"
8A I Gunston Cove
8A 2 " " , Can "3"
8A 3 " " , Nun "2"
8A MC Potomac Fl "6k"
10 MC Indian Head
IDA 0 Occoquan Bay, Fl "12"
IDA 1 " " , Fl "9"
10A 2 " " , Fl "6"
10A 3 " " , Fl "2"
10A 3A " " , Mid bay
10A MC Potomac Fl "ฃl"
10B 0 Mattawoman Creek, near bridge
10B 1 " '< , Bullitt Neck
10B 2 " " , Sweden Point




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10B MC            Potomac Fl "
11  MC            Possum Point
12  MC            Sandy Point
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                  Enibayment Station _ Location _
 fl                    10B  3             Mattawoman Creek,  Deep Point
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                       16
    POTOMAC ESTUARY

EMBAYMENTS  AND TRANSECTS
           1970
                                    10
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