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HomeMy WebLinkAboutThe Premium Marsh Summer 1980 The Demise of an Estuary 7/1/1980 4 i THE PREMIUM MARSH SUMMER 1980 . 4 ( O 1 THE DEMISE OF AN ESTUARY BY ROBERT P. HOHBERG B.S. , M.A. , P.D. 0 INTRODUCTION The purpose of this study is four-fold: 1.) To review the data of previous studies of the Premium Marsh including: RECENT TRENDS OF SEDIMENT ACCUMULATION IN THE PREMIUM SALT MARSH, LARCHMONT, NEW YORK by Morein Cohen THE PREMIUM - AN ENDANGERED WATERWAY by Robert E. White, P.E. PREMIUM RIVER DREDGING FEASABILITY STUDY by James B. Cropper ADDENDUM TO REPORT BY ROBERT WHITE by Mary Anne Johnson LARCHMONT HARBOR SALT MARSH ECOSYSTEMS by Dr. James M. Utter LOCAL COASTAL MANAGEMENT PROGRAM NEW ROCHELLE, NEW YORK Prepared by Raymond, Parish, Pine & Weiner Inc. CORING STUDY OF THE PREMIUM MARSH - Author Unknown 2.) To analyze and condense the data of the above mentioned reports in order to provide direction for obtaining additional pertinate data. 3.) To execute the additional field work and analysis to obtain this data. 4.) To provide recommendations, on the basis of the data collected, for further management of the Premium Marsh area. -1- Introduction: (Continued) 1.) A series of reports and studies on the Premium have been prepared over the last several years. The following list of problems of the Premium, while not exhaustive, can serve as a good indication of the complexity of the matter: A.) Sedimentation caused by sand and other materials delivered by the various storm drains, some of which originate in New Rochelle and emptied into the river which is contained entirely in the Town of Mamaroneck and the Village of Larchmont. B.) Sedimentation caused by construction activities on prop- erties rop-erties near the river. C.) Sedimentation contributed by incoming tides. D.) Growth of algae induced by shallower, and often, warmer, waters. E.) Pollution that may be caused by broken sewer lines or inoperative septic systems, mostly in New Rochelle. These are likely to be at least partially responsible for the high Coliform counts. F.) Pollution that may be caused by incoming tides. G.) Presence of manmade and natural objects in the river, from logs to shopping carts which, besides being unsightly, are also silt catchers. The fact is that the priceless resource represented by the Premium Marsh is gradually being lost as a result of these highly complex causes that are inter-municipal in nature (Raymond, Parish, Pine & Weiner Inc.) Ecologic succession of a salt marsh ordinarily follows a pattern of gradual succession from mud or sand flat to intertidal marsh to high marsh associations through sediment and organic matter accumulation. This is called the Shaler Theory of marsh formation and is hypothesized to be the type that pertains to Premium River Salt Marsh. In most New England salt marshes it takes two hundred years or more for the intertidal sections to fill in beyond the mean high water level where high marsh vegetation could take root and survive (Morein Cohen) . Manmade intervention dates back to 1741 as noted in the Robert E. White report stating "An even older dam had existed since prior to 1741 at the site of the present Red Bridge when the Palmer family which owned a large manor in the vicinity, used the impounded tidal waters to provide power for the first Premium Grist Mill". 4 -2- 4 Introduction: (Continued) 4110 We may conclude that thanks to manmade intervention dating beyond 1741, the Shaler Theory has had adequate time to fulfill its predictions for the Premium Marsh. 2.) A potential wetland site's evaluation must include studies of salinity, tidal range, hydraulic patterns, exposure to wind or wave action, elevation and depths of H2O the area to be converted to wetland, and presence or absence of suitable surrounding habitat. I. would also recommend that you get an expert in the field of saltwater biology, who could give you advice on what depth of dredging should be contemplated that would be best from the standpoint of improving the habitat for waterfowl and the fishery of the Premium River. (James B. • Cropper) . Since I have been trained in both Marine Biology and Biological Oceanography, I decided that a study of salinity would be most appropriate even to the point of indicating tidal range in an estuarine. The latter parameter would be approached in a search for the presence of a Halocline within the estuary. All of the reports mentioned in section one (1.) have alluded in some respects to the problem of sedimentation. The waters which are blamed for such sedimentation range from the Premium River, Pinebrook River to the tidal waters of the sound itself. In order to resolve the problem of which of these waters are most responsible for delivering these sediments, I decided to include measurements of Turbidity which would pinpoint those waters carrying the largest number of particles. Should a pattern in concentration gradient occur, this might also indicate those areas of unloading. 3.) Measurements of salinity weretaken with a Yellow Springs Industry (YSI) model 33 S C T salinometer. This meter is a portable electronic device which .provides near instant read out on conductivity, temperature and salinity (reported as parts per thousand = 0/00) . The instrument makes use of a fifty foot (50') probe which I marked at intervals of half a meter (0.5m) . Data-on turbidity were collected by means of a Hach Portalab Turbidimeter which is a portable nephelometer complete with a 10 N T U turbidity standard. All measurements are reported as Nephelometric Turbidity Units (NTU) . 4110 —3— 4.) Water samples were collected by means of a five (5) flush (Lamotte) sampling bottle with the temperature measured by a Celsius alcohol field thermometer. Each sample was analyzed within minutes after its col- lection . A metric marked line attached to the sampling bottle afforded measurement of the depth at which the sample was taken. Three (3) sampling series were undertaken with most of the measure- ments taken at high tide. Some additional samples were collected at low tide. The first two (2) series employed measurements of both turbidity and salinity. The third and last series concerns itself with a search for a Halocline within the estuary. The first two (2) series includes analysis of thirty three (33) samples. The Halocline series includes forty one (41) measurements of salinity. All pertinent data are recorded in the appendix of this report. Sampling stations were selected with an eye to remain in mid-channel and to record physical landmarks in order to identify each sampling station for reliability. Each station is coded and described in the record of this report found in the appendix. The coded stations are indicated on a map (by Mary Anne Johnson) designated as Figure 1 also included in the appendix of this report. The first series indicates that the incurrent waters of Long Island Sound carries a small amount of particles (3.6 N.T.U.) , at station one (1) at the Weir, by comparison to an immediate rise in particle carrying 410 at station two (2) , Red Bridge, (8.6 N.T.U.) with subsequent higher readings as you proceed upstream from Red Bridge. At station twelve (12) midway between the second turn in the channel from Woodbine Ave. and the foot of Willow Park (Oak Ave.) , tested out at 32.0 N.T.U. , which is the highest suspended particle reading of this series. The following upstream station which is thirteen (13) , at the foot of Willow Park (Oak Ave.) ,drops to 16. 0 N.T.U. indicating that half the suspended particles carried by the incoming tide is unloaded at or about the confluence of the Pinebrook and Premium Rivers. The continuance of this phenomenon can only lead to a marshy mud flat which will eventually block the excurrent waters of both rivers. Turbidity data upstream from station thirteen (13) along the Premium River, indicates more unloading at station fourteen (14)b. with an in- crease in carrying capacity to station fifteen (15) b. Upstream from this station (15b) further unloading occurs at station sixteen (16) b. This indicates that more particle pollution is picked up at the drainage ditch and then is unloaded at the outfall of the Premium River behind the Larchmont Diner. -4- .4 A low tide reading at station one (1) , at the Weir, records 4.2 N.T.U. ( a. 6 N.T.U. difference from high tide) which shows little or no discharge of particles into the sound. A low tide reading at station two (2) , at Red Bridge, records 24.0 N.T.U. (a 15.4 N.T.U. difference from high tide) shows considerable discharge of particles into the Premium Mill Pond. These readings tend to convince me that the sus- pended particles from Red Bridge towards the confluence of Premium and Pinebrook Rivers slosh back and forth from the Premium Mill Pond and back again to the mud flats of the river beds with no purging action into the Sound. At station sixteen (16)a. , the Pinebrook outfall at the Post Road, suspended particle readings were at the highest, 20.0 N.T.U. , at neap high tide with considerable discharge from the outfall. The lowest reading was 5.5 N.T.U. with a spring high tide and low discharge from the outfall. Neap low tide and spring low tide readings at this station were 10.0 N.T.U. and 15.0 N.T.U. respectively. These data indicate that the Pinebrook River adds particles to the marsh system at high discharge and low tide conditions with only slight carrying capacity at spring high tide with low discharge. Inaddition salinity readings of 2.0 0/00 to 0.5 0/00 reveal that it is river water and not tidal sound waters that are carrying these particles. Station sixteen (16) b. , at the Premium River behind the Larchmont Diner, reads 20.0 N.T.U. with a salinity of 23.0 0/00 at spring high tide. This same station analyzes 7.5 N.T.U. with a salinity of 1.9 0/00 at neap high tide. The former set of data shows the particle carrying capacity of tidal waters while the latter indicates the small carrying capacity of the Premium River at its outfall. Analysis of station fifteen (15) b. , Premium River at the foot of the drainage ditch, ind- icates 21.0 N.T.U. with a salinity of 21.5 0/00 at High Tide. This station shows the highest carrying capacity of the Premium River under the influence of tidal waters. The second series was run with an eye to discover the carrying capacity of the waters within the Premium Mill Pond. Again the reading at station one (1) at the Weir, was 6.2 N.T.U. ( a difference of 2.6 N.T.U. from the first reading) indicating small particle contribution from the Sound. Since this reading was taken a month later, algae bloom organic matter could easily account for the 2.6 N.T.U. difference. Slight increases in particle carrying occur upstream toward Red Bridge with some small unloading at station one (1) c. , Premium Pond opposite Everett's Island. A larger increase to 9.4 N.T.U. is found at station one (1) d. opposite the edge of the wall at Trinity House. a reading of 8.3 N.T.U. at station two (2) , at Red Bridge, reliably compares to the first reading of 8.6 N.T.U. -5- The second series data bolsters the conclusion that the highest particle carrying waters are those upstream from Red Bridge. The third and last series concerns itself with a search for a Halocline within the Premium estuary. Consistant sampling was taken at surface, 0.5m, and 1.0m depths (excepting stations 15b, 13, and 10 where a 0.5m depth was reached) . The salinity reported in this series was only slightly higher than that recorded in the first two series which indicates good reliability. The slight rise in salinity readings could well be the result of later sampling in the summer months with a small amount of rainfall in the watershed, consolidating the salinity readings from the Halocline series and the first two series, I may conclude that the Halocline, when present, must exist upstream from station fifteen (15) a. , foot of Elm Ave. , in the Pinebrook River and upstream from station fifteen (15) b, at the foot of the Drainage Ditch, in the Premium River. Salinity for the Halocline series has a mean of 26.6 0/00, highest 28.0 0/00 to the lowest 25.3 0/00 (range) . Salinity for the second series has a mean of 16.9 0/00, highest 26.9 0/00 to the lowest 0.5 0/00 (range) . Salinity for the first series has a mean of 19.6 0/00, highest 27.0 0/00 to the lowest 0.5 0/00 (range) . The mean salinity for all three series is 21.0 0/00, highest .26.6 0/00 to the lowest 16.9 0/00 (range) . In perusing these salinity statistics one should be mindful of the fact that the first two (2) series include the fresh water 110 station readings at or about the outfalls of both the Pinebrook and Premium Rivers. Comparing the mean salinity of all three series (including "fresh water" data) of 21.0 0/00 to the mean salinity of 16.8 0/00 reported by James M. Utter (January 1975) , I find a 4.2 0/00 rise in salinity . Since the 1975 data does not include any salinity readings approaching that of fresh water, a more accurate comparison would have to be on the basis of 11.9 0/00 salinity and higher. On this basis I would compare the mean salinity of all three series as 25.2 0/00 to the mean salinity of 16.8 0/00 reported by James M. Utter (January 1975) . This comparison indicates an 8.4 0/00 rise in salinity since 7/30/75. e -6- The significance of the above comparison becomes much more meaning- ful when one ponders the following statement: "When a bay or part of a river mouth is temporarily cut off from the sea by a sand bar, the salinity may actually increase beyond that of the open ocean due to evaporation"- Fundamentals of Ecology by Eugene P. Odum. Therefore, I conclude that the sediment deposits in mud flat configurations, especially at the confluence of the Pinebrook and Premium Rivers, are acting like a sand bar configuration and are well in the process of cutting off the rivers from the sound outlet. If one further considers, "recall that fresh water usually has a salinity of less than 0.5 0/00" - Fundamentals of Ecology - by Eugene P. Odum, then the tidal range of Long Island Sound extends to the outfall of the Pinebrook River at the Post Road (16a) and the Premium River behind the Larchmont Diner (16b) . Coupling this with the turbidty data, I conclude that the force to reckon with in the management of the Premium Marsh is the tidal waters of the Long Island Sound which dominates the system. The rivers, them- selves, are reld gated to nothing more than storm drain outlets. This last statement is further born out by the position of a possible Halocline existing upstream of Elm Ave. (Pinebrook River) and upstream of the drainage ditch (Premium River) 4. Conclusions: 1.) The dominant force in the Premium Marsh is the tidal waters of the Long Island Sound 2.) The Sound contributes very little particle carrying waters into the system. 3.) The most turbid (particle carrying) waters are those upstream from Red Bridge. 4.) Particulate pollution occurs in the greatest part from the environ- ment around the system upstream from Red Bridge. 5.) Salinity data indicates: A.) A river system well on its way to being blocked up by mud flat deposition. B.) The end of the system remaining an estuary as revealed by the absence of a clearly defined Halocline and increased Salinity. 6.) The Pinebrook and Premium Rivers will back up, under flood conditions, should the prevaioing factors be allowed to continue unchecked. -7- • Recommendations: 1.) The Premium Marsh system must be restored toward the following objectives: A.) Restoration of free flowing river channels by: 1.) Removing the mud flat blockage in the channel at the foot of Willow Park (Oak Ave.) - station 13 2.) Improvement of tidal flow through Red Bridge (station 2) and at the Weir (station 1 ) 3.) Restoration and installation of retaining walls and • wooden bulwarks along the Mamaroneck and New Rochelle shorelines (stations 5, 6, and 7 ) . B.) Initiation and periodic repetition of the following studies: 1.) bottom contour 2.) channel velocities 3.) coliform counts 4.) bottom sediment chemical analysis 5.)mean high tide and low tide levels 6.) analysis of dominant vegetation 411 2.) Investigation and Research for sources of possible funding for the above recommendations. • • 0 -8- • t • •• • • • • • • • • • APPENDIX • • • C • • I cw Station: Date: Time: 1.) At the Weir 7/9/80 10:00 A.M. Conditions: Water Temperature: 200C Bright Sun Air Temperature: 23°C High Tide Depth: Sample Description: 2.0 m Slightly Cloudy No Odor Tests: Note: Turbidity 3.6 N.T.U. Striped Bass caught at site as reported by fisherman First Series Station: Date: Time: 410 2.) At Red Bridge 7/10/80 10:54 A.M. Conditions: Water Temperature: 23°C Overcast Air Temperature: 24°C Occasional Sun High Tide Depth: Sample Description: 1.5 m Cloudy No Odor Tests: Note: Small fish activity Turbidity 8.6 N.T.V. C -1- Station: Date: Time: 3.) First turn in Channel 7/11/80 12:38 P.M. upstream from Red Bridge Conditions: Water Temperature: 25°C Hazy Sun Air Temperature: 23°C High Tide Depth: Sample Description: 1.0 m Cloudy No Odor Tests: Turbidity 9.9 N.T.V. First Series Station: Date: Time: 4.) Second turn in Channel 7/12/80 12:31 P.M. upstream from Red Bridge Conditions: Water Temperature: 25°C Bright Sun Air Temperature: 30°C High Tide Depth: Sample Description: 1.0 m Cloudy No Odor Tests: Note: Turbidity 10. 1 N.T.U. Dead Raccoon in water First Series Omilt -2- Station: Date: Time: 5.) First house upstream from 7/13/80 12:40 P.M. second turn in Channel after Red Bridge Conditions: Water Temperature: 24°C Cloudy Air Temperature: 29°C High Tide Depth: Sample Description: 0.5 m Cloudy No Odor Tests: Turbidity 18.0 N.T.U. First Series ISO Station: Date: Time: 6.) At the foot of 7/14/80 1:31 P.M. Hazel Lane Conditions: Water Temperature: 26°C Bright Sun Air Temperature: 33°C High Tide Depth: Sample Description: 0.25 m Cloudy No Odor Tests: Turbidity 12.0 N.T.U. First Series -3- Station: Date: Time: 7.) At the foot of 7/15/80 2:48 P.M. Guion Lane Conditions: Water Temperature: 27°C Overcast Air Temperature: 31°C High Tide Depth: Sample Description: 0.25 m Cloudy No Odor Tests: Turbidity 15.0 N.T.U. First Series Att Station: Date: Time: 8.) First landing upstream 7/16/80 3:17 P.M. Guion Lane Conditions: Water Temperature: 27°C Hazy Sun Air Temperature: 37°C High Tide Depth: Sample Description: 0.25 m Cloudy Foul Odor Tests: Turbidity 20.0 N.T.U. Salinity 26.5 0/00 First Series -4- Station: Date: Time: 9.) Foot of 7/18/80 4: 35 P.M. Woodbine Ave. Conditions: Water Temperature: 29°C Bright Sun Air Temperature: 32°C High Tide Depth: Sample Description: 0.25 m Cloudy No Odor Tests: Note: Turbidity 16.N.T.U. Oil slicks on Salinity 26.0 0/00 the water surface First Series 41) Station: Date: Time: 10.) First turn in Channel 7/19/80 5:45 P.M. upstream from Woodbine Ave. Conditions: Water Temperature: 28°C Sunny Air Temperature: 30°C High Tide Depth: Sample Description: 0.5 m Cloudy Slight Odor Tests: Turbidity 15.0 N.T.U. Salinity 26.5 0/00 First Series -5- Station: Date: Time: 3 11.) Second turn in Channel 7/25/80 10:28 A.M. upstream from Woodbine Ave. Conditions: Water Temperature: 25°C Sunny Air Temperature: 30°C High Tide Depth: Sample Description: 0.5 m Cloudy Rotten egg odor Tests: Turbidity 26.0 N.T.U. Salinity 27.0 0/00 First Series Station: Date: Time: 12.) Midway between second turn 7/26/80 11:15 A.M. in Channel from Woodbine Ave. and the foot of Willow Park ( Oak Ave.) Conditions: Water Temperature: 28°C Sunny Air Temperature: 32°C High Tide Depth: Sample Description: 0.25 m Cloudy No Odor Tests: Turbidity 32.0 N.T.U. Salinity 25.0 0/00 First Series -6- Station: Date: Time: 410 13.) Foot of Willow Park 8/3/80 6:15 P.M. (Oak Ave.) Conditions:. Water Temperature: 30°C Bright Sun Air Temperature: 33°C High Tide Depth: Sample Description: 0.25 m Cloudy No Odor Tests: Turbidity 16.0 N.T.U. Salinity 25.0 0/00 First Series Station: Date: Time: 14. a.) Corner of the retaining 8/4/80 7:19 A.M. wall at Tony's Nursery Conditions: Water Temperature: 26°C Hazy Sun Air Temperature: 29°C High Tide Depth: Sample Description: 0.1 m Cloudy Slight Odor Tests: Turbidity 19.0 N.T.U. Salinity 18.5 0/00 First Series C -7- sr Station: Date: Time: 3 15. a.) Foot of Elm Ave. 8/5/80 8:15 A.M. Conditions: Water Temperature: 23°C Sunny Air Temperature: 25°C High Tide Depth: Sample Description: 0. 1 m Cloudy Oily Odor Tests: Turbidity 14.0 N.T.U. Salinity 11.5 0/00 First Series Auk .4110, Station: Date: Time: 16. a.) Pinebrook outfall at the 7/21/80 5:45 A.M. Post Road Conditions: Water Temperature: 22°C Hazy Sunrise Air Temperature: 28°C High Tide (neap) Considerable Discharge from the Outfall Depth: Sample Description: 0. 1 m Cloudy Slight Odor Tests: Turbidity 20.0 N.T.U. Salinity 0.5 0/00 First Series mok -8- Station: Date: Time: 16. a. ) Pinebrook outfall at 8/9/80 12:11 P.M. the Post Road Conditions: Water Temperature: 22°C Sunny Air Temperature: 31°C High Tide (Spring) Depth: Sample Description: 0.1 m Clear Oily Odor Tests: Turbidity 5.5 N.T.U. Salinity 2.0 0/00 First Series 411 Station: Date: Time: 14 b. ) Premium River 8/10/80 1:05 P.M. at Lorenzen Park Conditions: Water Temperature: 29° C Sunny Air Temperature: 29°C High Tide Depth: Sample Description: 0.25 m Cloudy Odor of rotten eggs Tests: Turbidity 14.0 N.T.U. Salinity 25.2 0/00 First Series -9- Station: Date: Time: 3 15 b. ) Premium River, foot of 8/11/80 1:35 P.M. Drainage Ditch Conditions: Water Temperature: 28°C Sunny Air Temperature: 32°C High Tide Depth: Sample Description: 0.3 m - Cloudy No Odor Tests: Turbidity 21.0 N.T.U. Salinity 21.5 0/00 First Series 3 Station: Date: Time: 16 b. ) Premium River, behind 8/7/80 9:15 A.M. chmont Diner Condition: Water Temperature: 22°C Sunny Air Temperature: 260C High Tide (neap) Depth: Sample Description: Surface Clear Oily Odor Tests: Turbidity 7.5 N.T.U. Salinity 1.9 0/00 First Series -10- • Station: Date: Time: 16. b) Premium River, behind 8/28/80 2:15 P.M. Larchmont Diner Conditions: Water Temperature: 28°C Sunny Air Temperature: 31°C High Tide(Spring) Depth: Description: Surface Slight Amber Color No Odor Tests: Turbidity 20.0 N.T.U. Salinity 23.) 0/00 First Series Station: Date: Time: 2.) Red Bridge 7/22/80 7:45 P.M. Conditions: Water Temperature: 31°C ' Cloudy Air Temperature: 26° High Tide (neap) Depth: Sample Description: 1.5 m Cloudy Slight Odor Tests: Turbidity 20.0 N.T.U. Salinity 27.0 0/00 First Series -11- Station: Date: Time: 1.) At the Weir 8/28/80 7:35 A.M. Conditions: Water Temperature: 25°C Hazy Sun Air Temperature: 25°C Low Tide Depth: Sample Description: 0.25 m Slightly Cloudy No Odor Tests: Turbidity 4.2 N.T.U. Salinity 26.5 0/00 Low Tide Series Station: Date: Time: 2.) Red Bridge 7/24/80 3:18 P.M. Conditions: Water Temperature: 26°C Sunny Air Temperature: 31°C Low Tide (Spring) Depth: Sample Description: 0.5 m Cloudy Slight Musty Odor Tests: Turbidity 24.0 N.T.U. Salinity 25.0 0/00 Low Tide Series -12- OStation: Date: Time: 16 a) Pinebrook outfall at 8/6/80 3:13 P.M. the Post Road Conditions: Water Temperature: .20°C Sunny Air Temperature: 30°C Low Tide (neap) Depth: Sample Description: 0.1 m Clear No Odor Tests: Turbidity 10.0 N.T.U. Salinity 0.5 0/00 Low Tide Series 411 Station: Date: Time: 16 a.) Pinebrook outfall at 7/17/80 10:23 A.M. the Post Road Conditions: Water Temperature: 20°C Overcast with drizzle Air Temperature: 28°C Low Tide (Spring) Depth: Sample Description: 0. 1 m Cloudy No Odor Tests: Turbidity 15.0 N.T.U. Salinity 0.5 0/00 Low Tide Series 0 -13- iStation: Date: Time: 1.) At the Weir 8/12/80 12:11 P.M. Conditions: Water Temperature: 25°C Sunny Air Temperature: 29°C High Tide Depth: Sample Description: 1.0 m Clear No Odor Tests: Turbidity 6.2 N.T.U. Salinity 25.0 0/00 Second Series Station: Date: Time: 1 a.) Premium Pond at White 8/15/80 2:45 P.M. House on island Conditions: Water Temperature: 24°C Partly Cloudy Air Temperature: 28°C High Tide • Depth: Sample Description: 3.5 m Clear No Odor Tests: Turbidity 6.3 N.T.U. Salinity 24.5 0/00 Second Series -14- CStation: Date: Time: 1 b) Premium Pond at the 8/16/80 3:04 P.M. second house upstream from the white island house Conditions: Water Temperature: 23°C Cloudy Air Temperature: 24°C High Tide (neap) High Wind Depth: Sample Description: 2.5 m Clear No Odor Tests: Turbidity 6.7 N.T.U. Salinity 24.25 0/00 • Second Series Station: Date: Time: 1 c) Premium Pond opposite 8/13/80 2:05 P.M. Everett's Island Conditions: Water Temperature: 25°C Sunny Air Temperature: 30°C High Tide Depth: Sample Description: 1.0 m Clear No Odor Tests: Turbidity 5.5 N.T.U. Salinity 24.0 0/00 Second Series -15- Station: Date: Time: 3 1 d) Opposite the edge of 8/20/80 6:10 P.M. the wall at Trinity House Conditions: Water Temperature: 24°C Overcast Air Temperature: 24°C High Tide Depth: Sample Description: 0.5 m Clear No Odor Tests: Turbidity 9.4 N.T.U. Salinity 21.0 0/00 Second Series Adms Station: Date: Time: 2.) At Red Bridge 8/23/80 10:24 A.M. Conditions: Water Temperature: 22°C Sunny Air Temperature: 25°C Crest of High Tide Depth: Sample Description: 1.6 m Clear No Odor Tests: Turbidity 8.3 N.T.U. Salinity 26.9 0/00 Second Series -16- Station: Date: Time: 16 a) Pinebrook outfall at 8/14/80 3:00 P.M. the Post Road Conditions: Water Temperature: 22°C Overcast Air Temperature: 27°C High Tide (Spring) Depth: Sample Description: 0.3 m Clear Odor of Oil Tests: Turbidity 9.0 N.T.U. Salinity 5.5 0/00 Second Series 411 • -17- .. - Station: Date: Time: 2. ) At Red Bridge 8/27/80 7:19 P.M. Conditions: Hazy Sun Low Tide (neap) Salinity: Depth: Temperature: 25.0 0/00 Surface 28.5°C 26.0 0/00 0.5 m 28.0°C 26.2 0/00 1.0 m 28.0°C Halocline Series Station: Date: Time: 3 1.) At Weir 8/28/80 7:35 A.M. Conditions: Hazy Sun Low Tide Salinity: Depth: Temperature: 26.5 0/00 Surface 24.5°C 26.9 0/00 0.5 m 24.5°C 26.9 0/00 1.0 m 25.0°C Halocline Series -18- Station: Date: Time: 1. 5 b) Premium River at 8/25/80 12:11 P.M. foot of Drainage Ditch Conditions:. Sunny High Tide Salinity: Depth: Temperature: 24.0 0/00 Surface 29.0°C 26.0 0/00 0.5 m 26.0°C Halocline Series Station: Date: Time: s 1. 5 a) Foot of Elm Ave. 8/25/80 11:56 A.M. Conditions: Sunny High Tide Salinity: Depth: Temperature: 23.0 0/00 Surface 26°C 26.0 0/00 0.5 m 26°C • 27.0 0/00 1.0 m 26°C Halocline Series -19- Station: Date: Time: 13.) Foot of Oak Ave. at 8/25/80 12:21 P.M. Willow Park Conditions: Sunny High Tide Salinity: Depth: Temperature: 25.0 0/00 Surface 29°C 26.9 0/00 0.5 m 26°C Halocline Series e"• Station: Date: Time: 12) Midway between second 8/26/80 12:34 P.M. turn in channel from Woodbine Ave. and the foot of Willow Park Conditions: Sunny High Tide Salinity: Depth: Temperature: 25.0 0/00 Surface 28.5°C 25.0 0/00 0.5 m 28.0°C 27.0 0/00 1.0 m 26.0°C Halocline Series -20- • Station: Date: Time: 11.) Second turn in channel 8/26/80 12:45 P.M. upstream from Woodbine Ave. Conditions: Sunny High Tide Salinity: Depth: Temperature: 27.0 0/00 Surface 26°C 27.5 0/00 0.5 m 25.5°C,' 27.5 0/00 1.0 m 25.0°C Halocline Series liore Station: Date: Time: 10. ) First turn in channel 8/26/80 12:50 P.M. upstream from Woodbine Ave. Conditions: Sunny High Tide Salinity: Depth: Temperature: 27.0 0/00 Surface 26°C 27.0 0/00 0.5 m 26°C Halocline Series -21- CStation: Date: Time: 9. ) Foot of Woodbine Ave. 8/26/80 12:58 P.M. Conditions: Sunny High Tide Salinity: Depth: Temperature: 26.5 0/00 Surface " 26.5°C 27.0 0/00 0.5 m 25°C 27.2 0/00 1.0 m 25°C Halocline Series Station: Date: Time: 8.) First landing upstream 8/26/80 1:04 P.M. from Guion Lane Conditions: Sunny High Tide Salinity: Depth: Temperature: 26.9 0/00 Surface 26.5°C 27.0 0/00 0.5 m 26°C 27.2 0/00 1.0 m 25°C Halocline Series -22- Station: Date: Time: 7.) At the foot of Guion Lane 8/24/80 11:16 A.M. Conditions: Sunny Crest of High Tide Salinity: Depth: Temperature: 27.0 0/00 Surface 24.5°C 27.0 0/00 0.5 m . 24.0°C 27.0 0/00 1.0 m 23.0°C Halocline Series 111 Station: Date: Time: 6.) At foot of Hazel Lane 8/26/80 1:08 P.M. Conditions: Sunny High Tide Salinity: Depth: Temperature: 26.5 0/00 Surface 27°C 27.0 0/00 0.5 m 26°C 27.0 0/00 1.0 m 26°C Halocline Series C -23- Station: Date: Time: (10 3.) First turn in channel 8/26/80 1:19 P.M. from Red Bridge Conditions: Sunny High Tide Salinity: Depth: Temperature: 26.2 0/00 Surface 27°C 27.0 0/00 0.5 m 26.5°C 27.0 0/00 1.0 m 26.0°C Halocline Series 3 Station: Date: Time: 2) Red Bridge 8/22/80 8:59 P.M. Conditions: Overcast High Tide Salinity: Depth: Temperature: 27.5 0/00 Surface 20°C 27.0 0/00 0.5 m 20.5°C 27.0 0/00 1.0 m 20.5°C Halocline Series -24- ® Station: Date: Time: 1 b) Second house from Island 8/23/80 9:30 A.M. House in Premium Pond Conditions: Sunny High Tide Salinity: Depth: Temperature: 28.0 0/00 Surface 22°C 28.0 0/00 0.5 m 22°C 28.0 0/00 1.0 m 22°C 28.5 0/00 1.5 m 21.5°C Station: Date: Time: 1.) At Weir 8/21/80 • 7:53 A.M. Conditions: Overcast • High Tide Salinity: Depth Temperature: 26.5 0/00 Surface 22°C 27.0 0/00 0.5 m 21.5°C 26.9 0/00 1.0 m 22.2°C 27.9 0/00 1.5 m 21.5°C Halocline Series -25- • �0�1R: N.Y. r_. •r ^` ipi . '4 1.... ::' ..--;-----------7. \ 1 i ci -t . II1Wr _..ajIIIIIII 1.S11 ArAIF-Ar•-•W".. Na-3 of State Designated Tidal Wetlands .._.t� f z H.M. - High Marsh or Salt Meadow • 'V I' - S.M. - Coastal Shoals, Bars and Mudflats Y, 3 II L.Z. Inshore Waters. (Littoral Zone) ! a . F.C. - Formerly Connected Tidal Wetlands - Zoning: Pryer Manor - • City of New Rochelle - R-1A w 1 ` • m' :fiddle Reach Town of Mamaroneck - R-10 - Low Density - r-` . �t of Zoning: Praiui.um Waterway Premium SII' ' C ,,•` River ••'/ N a-7 Town of Mamaroneck R-6 .2 ` •. R-10 - LowDensity `'.40 '-,, R-30 - Low Dens• • �, � '� 1 . . Lower Reach Si City of New Rochelle - R-1A �t • ; Village of Larchmont - R-5 �r C, - y . of • R-7.5 Z t _�i.; - ' :Premium River R-12.5 1-1-' r•,- - • R-30 . - - • - '\ 4/ - i: • -"Red" Bridge • • • ! f. • Premium - ,A%�� - � - / Causeway I1;- stili acrdaF/? 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