4.3.1 Low Slack 



The lort slack isotherm map shown on Figure 10 indicates the 

 thermal plume is fairly well distributed about the discharge 

 point at the quarry cut on Millstone Point. The 4° isotherm 

 extends up to 3500' directly off the quarry cut and continues 

 around to the north into the eastern portion of Jordan Cove. 

 The 6 and 8° isotherms define the edges of the jet itself. 

 The vertical profiles (Figure 14) along the axis of the plume 

 show that the 4° isotherm extends to the bottom up to 500' 

 from the quarry cut (Stations LSI and LS2). At 2,000' feet 

 from the quarry cut (Station LS3), the base of the thermal 

 plume is 10'-15' below the surface as indicated by the 1.5° 

 isotherm. A similar trend is observed on Profiles LS4 and 

 LS5 3500' off the quarry cut. 



The vertical profile located in the western entrance to 

 Jordan Cove (LS6) indicates a relatively high delta-T at the 

 surface which is not supported by horizontal transect data. 

 This station was sampled at the start of the low slack tide 

 mapping session and probably represents a remnant of the 

 previous maximum ebb tide. 



Similarly, the 1.5° delta-T observed throughout the water 

 column at Station LS7 also represents the influence of the 

 preceeding ebb tide. Since horizontal transect data 

 collected just offshore from this station recorded delta-T's 

 of less than 1.5°, Station LS7 was probably located in an 

 isolated remnant of ebb tide waters trapped against the 

 shore. 



4.3.2 



lax i mum Flood 



During the maximum flood tidal stage (Figure 11) strong 

 currents carry the thermal plume to the west. Mixing dilutes 

 the plume so that the 4 isotherm extends a maximum of 2,000' 



- 14 



