3-10 



Science Laboratory, 1974) . Local climatological data to supplement 

 these studies are available from various National Weather Bureau Sta- 

 tions including both New Haven (through 1969) and Bridgeport (through 

 1977) , Connecticut. 



METHODS 



Physical and chemical measurements were taken monthly in New 

 Haven Harbor and adjacent Long Island Sound from May 1971 through 

 October 1977. Station locations are shown in Figure 3-3. Results of 

 these monthly surveys provide a comparison with data collected at the 

 continuous monitoring station located on the New Haven Harbor Station 

 pier. 



Monthly Sicrveys 



Profile measurements of temperature, conductivity, dissolved 

 oxygen, pH, and transparency were obtained during monthly surveys at 17 

 sampling stations (Figure 3-3) at both high and low tides. Measurements 

 were made at 1-m depth intervals from surface to bottom. Temperature, 

 conductivity, dissolved oxygen, and pH values were measured in the field 

 using a Hydrolab Surveyor Model 6D water quality analyzer. Transparency 

 was measured with a Secchi disc. On each given survey date, data were 

 collected during 3-hr periods within 1.5 hrs of high-water slack (data 

 designated as "flood") and low-water slack (data designated as "ebb") . 

 Salinity values were calculated from conductivity observations . 



Prior to each monthly survey, the Hydrolab Surveyor system was 

 calibrated in accordance with procedures recommended by the manufac- 

 turer, as modified by NAI for the purposes of this study. Calibration 

 of the system was checked after each survey to permit evaluation of the 

 acceptability of data. All data were accepted. 



