# 1540 FP- PB- eA) 

# Orange and Rockland Utilities, Incorporated Pearl River. New York

. J 

### . .



# Effectiveness Evaluation of 

# Fine Mesh Barrier Net Located at 

# the Cooling 

# Water 

# Intake of the Bowline Point 

# Generating Station 

# 1994 Barrier Net Evaluation Program Report



# January 1996

~ Lawler , Matusky & Skelly Engineers LLP



### One Blue Hill Plaza' Pearl River 

### , New York 10965 ENVIRONMENTAL SCIENCE & ENGINEERING CONSULTANTS

## ORANGE AND ROCKLAND UTILITIES, 

## INCORPORATED Pearl River, New York

EFFECTIVENESS EV 

## ALVATION OF A FINE MESH 

## BARRIER NET LOCATED AT THE COOLING WATER INTAKE OF THE BOWLINE POINT GENERATING STATION 1994 BARRIER NET EV 

## ALVA TION PROGRAM REPORT

January 1996



## LMSE- 96/0081 & 169/318



## LA WLER, MA TUSKY & 

## SKELLY ENGINEERS LLP 

## Environmental Science & Engineering Consultants



## One Blue Hill Plaza Pearl River 

## , New York 10965

mbll- 2.S-96 11:SOamIH24618/169-318/coycr/

## T ABLE OF CONTENTS
Page No.



## LIST OF FIGURES AND PHOTOGRAPHS LIST OF TABLES Program Summary 

## Introduction 

## Description of 1994 Fine Mesh Barrier Net Program

3.4 

## Ichthyoplankton Monitoring Program 

## Barrier Net Effectiveness MonitOring Program 

## Ichthyoplankton Sample Analysis Schedule of Events 

## 3-4 3-4 

## Program Results

4.3



## 4.4 Water Quality Information



## Ichthyoplankton Abundance MonitOring Program 

## Barrier Net Evaluation Program Bowline Point Generating Station Unit Operation Ichthyoplankton Abundance MonitOring Program 

## Inventory and Abundance of Taxa Collected Ichthyoplankton Abundance and Concentration 3.3 Length- 

### Frequency Information 

## 4-4 

## Fine Mesh Barrier Net Effectiveness Monitoring Program 4-4 

## 4.4. 

## Inventory and Abundance of Taxa Collected 4.4. Ichthyoplankton Abundance and Concentration 4.4. 3 Length- 

### Frequency Information 

# 4.4.4 Inside Barrier Net Velocity Profiles 

## 4-4


## 4-6 

## Bay Anchovy Body Length to Body Depth Relationship Discussion and Conclusions 

### General Program Description 

## Discussion of Program Results

MB/1- 22- 96 S:3SamlH2461S/169- 31srr-o-c/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

## T ABLE OF CONTENTS



## Ichthyoplankton Abundance Monitoring Program 

## Fine Mesh Barrier Net Effectiveness Evaluation 

## Program


## 5.4 Conclusions Recommendations References Cited 

## IT ACHMENTS Attachment A - Water Quality Information Attachment B - Ichthyoplankton Collection Information 

## Attachment C - Length Frequency Information by Location arid Date 

## Attachment D - Bay Anchovy Body Length - Body Depth Measurements 1994 Page No.



## 5-6



# Lawler, Matusky & Skelly Engineers LLP MB/1- 22- 96 S:3SamlH2461S/169-31srr-o-c/

### Figure/Photograph No.

Figure 3- Figure 3- Figure 3- 

### Photograph 3- Photograph 3- 

## PhotOgraph 3- PhotOgraph 3-4
Figure 3-4 

### PhotOgraph 3- 

### Photograph 3-6 Photograph 3- 

### Photograph 3-

Figure 5- Figure 5- Figure 5- 

## LIST OF FIGURES AND 

## PHOTOGRAPHS
Title 

## Page No. Location of Bowline Point Generating Station Fine Mesh Barrier Net 

## Ichthyoplankton Monitoring Stations Fine Mesh Barrier Net Evaluation 

## Program: 

## 5m Plankton Net Sample Transects Fine Mesh Barrier Net 

## Support Piles 3-4A 

## Deploying the Fine Mesh Barrier Net 3-4A 

### Deployed Fine Mesh Barrier Net 3-4B 

## Cooling Water Intake Pump Sampling Set-up 3-4B 

## Fine Mesh Barrier Net Deployment 3-4C 

## Top of Net Submerged Along North Side Near Apex Section of Fine Mesh Barrier Net Showing Biofouling and 

## Area Cleaned by High Pressure Spray Wash System Fine Mesh Barrier Net Being 

## Removed from the Water 

## Fine Mesh Barrier Net Piled on Deck of Work Barge Following Removal 

## Bay Anchovy Concentration - Inside Barrier Net Stations 5-4A 

## Bay Anchovy Concentration - Outside Barrier Net Stations 5-4B

Bay Anchovy Average Concentration - Inside vs 

## Outside 5-4C

mb/l- 22- 96 l:O6pmIH2461S/169-31SII-o-f-p 

## iii 

# Lawler 

# , Matusky & Skelly Engineers LLP

## LIST TABLES

Table No. 

## Title Page No.



## Ichthyoplankton Abundance Monitoring Program: Sample 

## Collection Dates and Stations Sampled 

## Barrier Net Effectiveness Monitoring Program: Sample Collection Dates and Locations Sampled Ichthyoplankton Abundance Monitoring Program: Water Quality Information 

## Fine Mesh Barrier Net Evaluation Program: Water Quality Information 

## Bowline Point Generating Station 

## , Circulating Water Pump Operation and Cooling Water Flow , Fine Mesh Barrier Net Evaluation Study: 

### 1994 

## 4-4 

## Ichthyoplankton Abundance MonitOring Program:



## Species Inventory and Abundance 22 June- 8 July 1994 

## Ichthyoplankton Abundance MonitOring Program:

Abundance and Concentration of Morone 

## spp. 

## 4-6 

## Ichthyoplankton Abundance Monitoring Program:



## Abundance and Concentration of Bay Anchovy 4-4A 

## Ichthyoplankton Abundance Monitoring Program: 

## Abundance and Concentration of Hogchoker 4-4B 

## Ichthyoplankton Abundance Monitoring Program: 

## Abundance and Concentration of Clupeidae 4-4C 

## Ichthyoplankton Abundance MonitOring Program: 

## Bay Anchovy Length Frequency Information 4-4D 

## Fine Mesh Barrier Net Evaluation Program: Species 

## InventOry and Abundance By Location 4-4E Fine Mesh Barrier Net Evaluation Program: Abundance and Concentration of Bay Anchovy 

## Fine Mesh Barrier Net Evaluation Program: Abundance and Concentration of Hogchoker

mbll- 22- 96 l:04pmIH246181l69-318/L'()-T 

# Lawler , Matusky & Skelly Engineers LLP

## LIST OF TABLES (Continued)
Table No. 

## Title

Bay Anchovy Length Frequency Information: Pump S~mples 

## and Plankton Net Samples Collected Inside the Barrier Net - 1994 

## Bay Anchovy Length Frequency Information: Plankton Net 

## Samples Collected Outside the Barrier Net - 1994 

## Fine Mesh Barrier Net Evaluation Program - 1994 

## Inside Barrier Net Velocity Profiles Page No.

mbll- 22- 96 S:38amIH2461S/169-31S/L'()-T 

# Lawler, Matusky & Skelly Engineers LLP

## CHAPTER PROGRAM SUMMARY
Orange and Rockland Utilities , Inc. 

## (ORU) contracted Lawler , Matusky 

## Skelly 

## Engineers LLP (LMS) to conduct a program to determine the effectiveness of a fine mesh barrier net (3. 

## 0 mm mesh opening) at limiting ichthyoplankton entrainment at the Bowline 

## Point Generating Station (BPGS). The evaluation program was conducted in two separate phases: Phase 

# I was an ichthyoplankton abundance monitoring program designed to determine abundance levels of the target species (bay anchovy (Anchoa mitchU/z1) 

### and to 

## time the deployment of the fine mesh barrier net; and Phase II was an ichthyoplankton 

## sampling program with samples collected at stations inside and outside of the fine mesh 

## barrier net to determine the exclusion effectiveness of the net. The ichthyoplankton abundance monitoring program was conducted between 22 June and 

# 8 July 1994. 

# The results of the abundance monitoring program indicated that the
dominant ichthyoplanktonspecies present were Morone 

## spp. (striped bass , white perch), 

# with bay anchovy larvae the second most abundant species. 

## Two general areas were sampled Haverstraw Bay and Bowline Pond 

## , with greater numbers of larvae collected at 

## Haverstraw Bay sampling stations. Based on the results of the ichthyoplankton abundance monitoring program , the fine mesh 

## barrier net was deployed during the second week of July with deployment complete on 

# 13 July 

# 1994. Ichthyoplankton sampling to determine barrier net effectiveness 

## commenced on 12 July and continued through 5 August 1994 when the net was removed. 

## The 1994 fine 

# mesh barrier net evaluation period was limited due to extensive net biofouling which resulted in snapping of two of the support piles. 

## Underwater cleaning 

## which was relatively successful during 1993 when the net was fouled by fine sediment 

# was not successful during 1994 when the net was fouled by the algae Ectocarpus 

## sp. 

## Successful cleaning of the net was achieved by removing the net from the water prior to 

## spraying with a high pressure wash system. Overall there was no difference recorded in 

## the concentration of bay anchovy larvae between inside and outside net locations during the 1994 study period.

MB/l- 23- 96 3:4OpmIh24618/169-318/chap-1I 

# Lawler, Matusky & Skelly Engineers LLP

## The following 

# conclusions are based on the fine 

# mesh barrier net evaluation studies



## conducted by LMS during 1992 through 1994:


## . A 

## fine mesh barrier net (3. 0 mm mesh) can be deployed around the BPGS 

## cooling water intake structure without limiting use of 

## Bowline Pond or imposing operating restrictions on BPGS cooling water pump operation. Fine sediment colgging of the 

## mesh can be cleaned using a high pressure wash system with the net fully deployed. however , the underwater cleaning 

# requires divers and is very inefficient as to time and areal coverage. 

## Biofouling growth is not effectively removed underwater , but can be 

## effectively removed using a high pressure spray system with the net out of . the water. 

### . Bay 

## anchovy abundance levels were low during both 1993 and 1994 when 

## the fine mesh barrier net was deployed. In addition 

## , the period when the 

# bay anchovy larvae are present in the vicinity of the plant was of short duration. The low abundance 

# levels and short time frame to evaluate barrier net effectiveness has limited the 

## ability of a biological monitoring program to effectively 

## determine the effectiveness of the fine mesh barrier net.

MB/l-4-96 3:47pmlh24618/169-318/chap-l/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

## CHAPTER 2 

## INTRODUCTION BACKGROUND 

## Since 1977 Orange and Rockland Utilities, Incorporated (ORU) has seasonally deployed (midOctober through mid- 

## May) a barrier net around the Bowline Point Generating Station (BPGS) 

## cooling water intake, a shoreline intake located on Bowline Pond, to limit fish impingement on 

## the intake traveling screens (Hutchison and Matousek 1988). During t.':1e 

### spring-summer period 

## fishery investigations demonstrated that impingement is not a problem at the plant , therefore no barrier net is installed. The net with 

## nominal 9.5 mm mesh has been shown to be very effective at mitigating fish 

## impingement (NAI 1995). 

## As part of the Hudson River Utilities Settlement Agreement (1980) during the spring-summer period 

# , the Hudson River Utilities agreed to reduce water withdrawal rates at the four lower 

## Hudson River power plants subject to the agreement 

# , as a means of reducing ichthyoplankton entrainment impacts. Reduction in water withdrawal can 

## be accomplished through either reducing 

## cooling water pump flow rates , or through unit outages. The Bowline Point Generating Station in order to meet the requirements of the Settlement 

## Agreement related to reduction in cooling water withdrawal , mainly employs unit 

## outages coupled with some flow reduction achieved 

## through reduced circulating water pump operation. The reduction in cooling water withdrawal from Bowline Pond has been shown to have a 

# direct relationship on the number of ichthyoplankton entrained (EA 1989). 

## ORU contracted Lawler , Matusky & Skelly Engineers LLP (LMS) to determine the feasibility 

## deploying a fine mesh barrier net at the Bowline Pond intake to the BPGS during the springsummer months as a means of reducing ichthyoplankton entrainment. Work accomplished under 

## the initial study phase included; (1) summarizing ichthyoplankton information from the Hudson River (Haverstraw Bay), and Bowline Pond (including entrainment), (2) obtaining information on 

## water velocities in Bowline Pond concentrating on the inlet to the Pond 

## , and the 9. 5 mm mesh barrier net deployment area , and (3) monitoring net mesh panels made of nylon and polyethylene for biofouling 

## potential and loss of filtration efficiency due to clogging and biofouling. In 

## general 

## , the results of the initial phase indicated that a fine mesh barrier net could potentially be deployed at the cooling water intake over the summer months; however 

## , there were several areas 

## of concern related to barrier net deployment (LMS 1992).

MB/l- 23- 96 3:42pmlb2461S/169-31S/chap- 

## Lawler 

# , Matusky & Skelly Engineers LLP

## LMS was subsequently contracted by ORU (Phase II) to design a 

## fine mesh barrier net

(configuration mesh size), deploy the net 

## , monitor the net for clogging and biofollling, and determine the effectiveness of the net at limiting ichthyoplankton entrainment. 

## The evaluation of 

## the fine mesh barrier net was conducted during the summer of 1993. Prior to the initiation of the 

## study, LMS evaluated the available ichthyoplankton data to use in determining the period of net deployment, optimum size of the net mesh opening, and ichthyoplankton abundance and size. 

## The
bay anchovy (Anchoa mitchillz) 

## was determined to be the dominant ichthyoplankton in the study area 

## , with the period of abundance extending from early July through August. Based on the 

## dominance of the bay anchovy, it was selected as the target species for the determination of barrier net effectiveness. Following the 

## selection of the bay anchovy as the target species 

## , a net 

## mesh size of 3. 0 mm (0. 125- in. 

## ) was selected. 

## The results of the fine mesh barrier net evaluation study was summarized in a report submitted 

## to ORU in April 1994 (LMS 1994). During the 1993 study 

## period, ichthyoplankton abundance 

## in Bowline Pond was very low , and fine mesh barrier net effectiveness based on larval exclusion could not be determined. 

## A second year of fine mesh barrier net effectiveness testing at the BPGS cooling water intake was 

## scheduled for the summer of 1994. The 1994 study consisted of two biological components; the 

## first was an ichthyoplankton monitoring program utilizing 0. 5m mouth diameter plankton nets in 

## Bowline Pond and Haverstraw Bay to document the presence and abundance of fish larvae in the area , and the second 

## was the determination of the effectiveness of a fine mesh barrier net at limiting ichthyoplankton entrainment. 

## The same net deployed and tested during 1993 was deployed during 1994 , with the same deployment method used. The sampling 

## and analytical techniques employed in the 1994 study 

## were the same techniques 

## employed by LMS in conducting the 1993 barrier net effectiveness 

## evaluation study (LMS 1994). 

## PROGRAM OBJECTIVES The primary objective of the 

## 1994 fine mesh barrier net evaluation study is to determine the effectiveness of the net at excluding fish larvae from the immediate vicinity of the Bowline Point cooling water intake structure. Specific program objectives are outlined below: 

## Conduct a bay anchovy monitoring program at Bowline Pond and Haverstraw Bay 

## stations in order to insure that the net effectiveness study is performed during the

MB/I-Io-96 10:48amIh246IS/169-31S/chap- 

# Lawler, Matusky & Skelly Engineers LLPpeak abundance period. 

## A weekly sample will be collected at a Haverstraw Bay 

## station throughout the barrier net evaluation study period. 

## Deploy the fine mesh barrier net as per techniques outlined in LMS 1994. 

# (NOTE: Fine mesh barrier net deployment will be determined based on bay 

## anchovy abundance by the ORU project biologist. 

## Conduct underwater diver observations to determine the 

## integrity of the net following deployment , document organism impingement (or behavior near the mesh), and record net clogging and/or biofouling. 

## Determine barrier net effectiveness through a direct comparison between samples 

## collected at locations outside of the barrier net to samples collected at inside net 

## locations.

MB/I- Io-96 10:49amlh2461S/169-31S/chap- 

# Lawler, Matusky & Skelly Engineers LLP

## CHAPTER 3
DESCRIPTION OF 

## 1994 FINE MESH BARRIER NET PROGRAM 

## 1 ICHTHYOPLANKTON MONITORING PROGRAM An ichthyoplankton abundance monitoring program was conducted in the vicinity of the Bowline 

## Point Generating Station during the period 22 June through 8 July 1994 (Figure 3- 1). Results of 

## the abundance monitoring program were used to determine the presence and abundance of bay anchovy larvae in the Bowline Point vicinity, and if the abundance levels were sufficiently high 

## enough to deploy and initiate effectiveness monitoring of the fine mesh barrier net. 

## Ichthyoplankton samples were collected using a plankton net with a 0. 5 m (1. 64 it) diameter 

## mouth opening and 0. 5 mm (500 JLm) 

### mesh. Plankton net tows were conducted for 10 minutes 

## against the prevailing tidal current at a speed of 120 cm/sec (3. 9 fps) with velocity through the water monitored using a General Oceanics velocity meter (Model No. 2031) with on-deck readout 

## (Model No. 2035). The volume of water filtered through the net was calculated using the start 

## and end readings from a TSK velocity meter mounted in the center of the net mouth. 

## Surface and bottom net samples were collected along three transects (stations) on Monday, Wednesday, and Friday of each week. The surface plankton net was rigged to sample 1.0 m (3 

## it) below the waters surface , and the bottom plankton net was rigged to sample 2. 

## 0 m (6 it) above the bottom. Surface and bottom samples were 

## combined at each station (following crew chief examination to 

# obtain instantaneous estimates of larval abundance) prior to 

## laboratory 

## examination. The sampling dates and 

## stations sampled for the ichthyoplankton abundance 

## monitoring program are presented in Table 3- Sampling was conducted on a diurnal schedule with the surface and bottom tows done at the same 

## time at each station. The three sampling transects are described below and shown on Figure 3- 

## Bowline Pond in the vicinity of the Bowline Point cooling water intake structure and the area indicated for barrier net deployment. 

## In the Hudson River along a transect parallel to shore just off the inlet to Bowline 

# Pond. Station water depth approximately 6 m (20 it). 

## In Haverstraw Bay along a transect that is representative of the Hudson River at 

# Bowline Point.

MB/I- Io-96 11 :04amIh2461S/169-31S/chap-3/ 

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### Figure 3- 

## Location of Bowline Point Generating Station
. Map source: NOAA Chart No. 12343, 

### 1984 ORANGE & ROCKLAND UTILITIES, INC, ICHTHYOPLANKTON MONITORING PROGRAM LAWLER , MATUSKY & SKELLY ENGINEERS LLP

Peart River, New Yorit

## TABLE 3- 

## ICIITHYOPLANKTON 

## ABUNDANCE MONITORING PROGRAM SAMPLE COLLECTION DATES AND 

## STATIONS SAMPLED BOWLINE POND 

## BOWLINE POND INLET HA VERSTRA W BAY 

## DATE 

# SURFACE BOTTOM 

# SURFACE BOTTOM SURFACE BOTTOM

22 June 1994 24 June 1994 27 June 1994 29 June 1994 1 July 1994 6 July 1994 8 July 1994 13 July 1994 20 July 1994 27 July 1994

# 60 120 m LJ-oI.....J--oI 

## SCALE IN METERS ORANGE & ROCKLAND UTILITIES, INC, ICHTHYOPLANKTON MONITORING PROGRAM LAWLER, MA TUSKY & SKELL V ENGINEERS LLP \100\169\318, 

# ds4 Pearl RIver , New Vorl( DIFFUSER

FLOOD

FLOW 

# i . tow

! = i DIRECTION

EBB

Map source: EA (1989). 

# HUDSON RIVER

10 MINUTE TOW RIVER SITE 22' 28" DEEP

10 MINUTE TOW INLET SITE 21' 26" DEEP


## HA VERSTRA SA Y

Figure 3- 

## Sampling Stations

## All samples were examined on the boat immediately following net retrieval by the crew chief



## (person qualified to identify bay anchovy larvae) for the presence or absence of bay 

## anchovy larvae. The presence and 

## identification (field) of any larvae in each sample 

## was noted and a general abundance level was recorded. 

## Laboratory analysis of the ichthyoplankton abundance samples consisted of species identification 

## and enumeration. Up to 100 bay anchovy larvae per life stage per week (from all samples 

## combined) were measured for total length. All larvae in the abundance samples were preserved with the larvae actually measured preserved separately. Following deployment of the fine mesh 

## barrier net, and the 

# start of the net effectiveness 

## monitoring program 

## , a modified ichthyoplankton abundance monitoring program was conducted at the Bowline Pond inlet station. One 

## sample per week comprised of combined surface and bottom sample tows was collected using a 0. 5 m mouth 

## diameter plankton net with 0. 5 mm mesh. The tows were conducted for 10 minutes (mins) at 120 cm/sec. 

## A representative sample of each species identified was measured for total length.
2 BARRIER NET EFFECTIVENESS 

## MONITORING PROGRAM The major focus of the 1994 fine 

## mesh barrier net evaluation program was the determination of 

## barrier net effectiveness at mitigating bay anchovy (ichthyoplankton) larval entrainment. 

## determine barrier net effectiveness 

## , a direct comparison was made between samples collected at 

## locations outside of the barrier net to samples collected at inside net locations. The sampling 

## schedule and samples actually collected for the barrier 

## net effectiveness monitoring program is presented in Table 3- 2. The sampling 

## locations used in the barrier net effectiveness monitoring 

## program are presented in Figure 3-

1 Inside Barrier Net 

## Sampling Methods A four- 

## inch trash pump was the primary technique used to collect ichthyoplankton samples inside the barrier net. Ichthyoplankton 

## sampling was conducted at the BPGS cooling water intake 

## , with 

## pump samples collected from each unit with operating cooling water pumps. Sample water was 

## withdrawn from three separate depths corresponding to the top, mid-depth , and bottom of the 

## operating unit's central trash rack opening, and combined by discharging the entire pump flow into a water buffered plankton net with 0. 5 mm (5ooJLm) mesh. 

## The pumping rate was adjusted 

## to 1.1 m /min (300 gpm), with a sample duration of 30-min resulting in a total sample volume of 34 m 3 (9, 

### 000 gals). Equal volumes of water were withdrawn from 

## each depth by sampling for 

## 10 min at each depth out of the 30 min sample period. Total sample volume was determined

MBl1- 10-96 3:O2pmlh24618/169-318/cbap- 

# Lawler, Matusky & Skelly Engineers LLPV,)TABLE 3-BARRIER NET EFFECTIVENESS MONITORING PROGRAMSAMPLE COLLECTION DATES AND LOCATIONS SAMPLEDINSIDE BARRIER NET COLLECTIONSOUTSIDE BARRIER NET COLLECTIONS!NT AKE PUMP SAMPLESINSIDEPLANKTON NET SAMPLESUNIT No.UNIT No.PLANKTON NETNORTH SIDESOUTH SIDETOPMIDBOITOMTOPMIDBOITOMSURFACEBOITOMSURFACEBOITOMSURFACEBOITOM12 July 199413 July 199415 July 199418 July 199420 July 199422 July 199425 July 199427 July 199429 July 19945 August 1994

# HUDSON RIVER

DIFFUSER



## HA VERSTRA W
SA



### Figure 3- 5-m Plankton Net 

## Sample Transects 120m 

### L....J--LJ--.I SCALE IN METERS ORANGE & ROCKLAND l1T1LITIES, INC. ICHTHYOPLANKTON MONITORING PROGRAM LAWLER , MATUSKY & SKELLY ENGINEERS Ll. '1001169131S. 

# ds4 I Pearl RIver, New York Map source: EA (1989).

## through the direct timed measurement of discharge volume into the plankton net holding collection



## tank. 

## A total of three 30-min pump samples were collected in front of each operating unit during a 

## diurnal period. Pump sampling was conducted on Monday, Wednesday and Friday of each week 

## during which the barrier net was deployed (alternate days), with the first sample day conducted 

## prior to the completion of fine mesh barrier net installation. The collection of the three 

### pump 

## samples was evenly spaced over the diurnal evaluation period. In addition to the intake pump samples , a single plankton net tow was conducted inside the barrier net during each pump sampling date. 

## Two 0.5 m mouth diameter plankton nets with 0. 5 nun (500JLm) 

## mesh (one net deployed to sample the upper half of the water column , and the second net deployed to sample the lower half of the water column) were towed simultaneously across the face of the intake structure 

## , with the contents of the two nets combined prior to analysis.
2 Outside 

## Barrier Net Ichthyoplankton Sampling Plankton nets with a mouth opening diameter of 0.5 m and 0.5 nun mesh were used to collect ichthyoplankton samples outside the barrier net. 

## Two transects 

## , one along each side of the fine 

## mesh barrier net , were sampled with plankton nets towed between surface and mid-depth 

## , and between mid-depth and bottom. 

## The contents of each depth sample along each side of the net were combined prior to sample analysis. Nets were towed at 120 cm/s (3. 

## 9 ips) for two minutes 

## resulting in a sample volume of approximately 28 m 3 (7 400 gals). Sample tows 

### started at the 

## bulkhead and proceeded toward the apex of the net , with the two min sample duration ensuring 

## complete coverage of each side of the net. 

## Two sets of net samples (set=surface and bottom collections from the north and south net transects) were collected during a diurnal period , with the sample day corresponding to the pump sample day. One set of net 

## samples were collected during the morning hours , and the second set 

## were collected during the afternoon. 

# At the conclusion of each 

## outside sampling effort , the following physical and chemical 

## measurements were recorded at surface , mid-depth 

## , and bottom at a point near the apex of the barrier net: Water temperature (CO ), dissolved 

## oxygen (mg/l) , salinity (ppt) , and specific conductance (p.mhos/cm (if) 

## 250 C). In addition 

## , a measurement of water clarity was recorded 

## through the use of a 22. 9 cm (9. 

### in. 

## ) diameter Secchi disk

MBl1- 1o-96 1l:21amlh2461SI169-31S/cb.ap- 

## Lawler 

# , Matusky & Skelly Engineers LLP

## 3 ICHTHYOPLANKTON SAMPLE ANALYSIS



## Inside and outside barrier net samples were analyzed separately. All ichthyoplankton (larvae) were identified to the lowest practicable taxonomic level and counted. The life stage of the larvae 

## collected was designated 

## , and a representative sample of each identified taxon and life stage was 

## measured for total length. Bay anchovy body depth measurements recorded initially for the 1993 

## net evaluation program were continued for the 1994 study period. 

## 3.4 SCHEDULE OF EVENTS 

## The major events related to the deployment and evaluation of the BPGS fine mesh barrier net are listed in chronological order below:
. 21- 22 June: Nine wooden 

## piles were installed around the BPGS cooling water intake structure for attachment of the fine mesh barrier net. 

## Installed piles are shown in photograph 3-
. 22 June: Received 

## NYSDEC collectors permit.
. 22 

# June: Initiated the 

## Ichthyoplankton Monitoring Program which included 

## plankton net sampling at two Haverstraw Bay stations and one Bowline Pond station on a three time per week sampling 

## schedule.
. 8 July: Four inch 

## trash pump brought to the site and the intake sampling system set-up.
. 11- 13 July: Deployment of 

## the fine mesh barrier net. Divers used to attach the 

## cable between the pilings along the bottom and to attach the bottom of the net and support lines. Net installation complete at 1300 hours on 13 July. Net 

## deployment shown in photograph 3- 2. Deployed net 

## shown in photograph 3- 3. Schematic of 

## deployed net is given in Figure 3-4.
12 July: 

## Initiated trash pump sampling at the 

## BPGS cooling water intake and plankton net sampling at stations located inside and outside the fine mesh barrier 

# net as part of the net evaluation program. The cooling water 

## intake pump sampling set-up is shown in photograph 3-4.

3-4 MB/1- 11- 96 1:0Spmlb2461S/169-31S/cbap- 

## Lawler 

# , Matusky & Skelly Engineers LLP

### Photo 3- 

## 1. Fine mesh barrier net support piles. Photograph shows four piles located on the south side 

## , the apex pile 

## , and one pile on the north side. Debris boom is located around the outside of the piles.

Photo 3- 2. Deploying the 

## fine mesh barrier net.15 It

BOWLINE POINT SCREEN HOUSE



### PLAN VIEW ,.. ... ...... .... ....

NET SECTION ,,; 

# , / / ... 

# / "" 

# , /

.,,' 

# " . / / -



# 1,. ./ 

# ---

f ' :,:". .., 

# j'"'-

Chain SIDE

VIEW Figure 3-4 

## Fine Mesh 

## Barrier Net Deployment ORANGE & ROCKLAND UTILITIES, INC, FINE MESH BARRIER NET STUDY LAWLER, MATUSKY & SKEllY ENGINEERS UP

Pearl River , New York BAR. Ner dol 

### 3-4C

### 25 July: First time that net sections 

## were observed below the waters surface. Biofouling growth (filamentous brown algae) noted on the net. 

### Photograph 3- 

## shows submerged net along north side near apex.

. 28 July: Divers were brought in 

## to clean the net in place with high pressure water jets. Cleaning was not successful 

## , fine sediment was removed from the net , but the filamentous algae could not be cleaned from the net. 

## Divers indicated that the 

## algal growth covered approximately 90% of the net, 

## with equal coverage from surface to bottom.


### . 29 

# July: Following the unsuccessful attempt to clean the net in place , high , pressure jet sprays were secured and placed on the work raft. 

### The net section 

## between the south bulkhead and pile S 

## 1 was released from the bottom and brought 

## to the surface for cleaning. Cleaning of the algae from the net was successful 

### (Photograph 3- 6) when the net was clear of the water. 

## During cleaning of the net section 

## , piles S3 and S4 snapped at or near the bottom. The net section between pile S 1 and the south bulkhead was immediately released to reduce stress on the remaining piles and to pass adequate cooling 

### water. Adequate water 

## passed 

## through the open net between pile S 

## 1 and the south bulkhead that the remaining sections of the net floated to the surface.


### . 4 August: Fine mesh 

### barrier net removed. Net removal is shown in photograph 

## 7 and the biofouled net is shown piled on the work barge in photograph 3-
. 5 August: One 

### set of ichthyoplankton samples 

## (intake pump and plankton net samples) were collected following complete removal of the fine mesh barrier net.
21 September: Divers removed 

## the underwater cable and the wooden piles were removed.

MB/l-lo-96 3:1Opm/h2461S/169-31S/cbap- 

## Lawler 

# , Matusky & Skelly Engineers LLP

### Photo 3- 

## 5. Top of 

## net submerged along north side near apex.

Photo 3- 

## Section of fine mesh barrier net showing biofouling and area cleaned by high- pressure spray-wash system.

### Photo 3- 7. Fine 

## mesh barrier net being removed from the water.

Photo 3- 

## 8. Fine mesh barrier net piled on deck of work barge following removal.

Photograph shows extensive level of biofouling.

## CHAPTER 4 

## PROGRAM RESULTS

1 WATER QUALITY INFORMATION
1 IchthyopIankton Monitoring 

# Program Plankton net sampling was conducted at two Haverstraw Bay stations (Haverstraw Bay and Bowline Pond Inlet) and at a 

# Bowline Pond station (Bowline Pond) to assist in determining the presence and relative abundance of ichthyoplankton in the vicinity of the 

## Bowline Point Generating Station. Sampling under 

## the Ichthyoplankton Abundance Monitoring Program commenced on 22 June 1994. Water samples for the determination of water temperature (D 

## C), dissolved oxygen (mg/I), specific conductance ~mhos/cm (if) 25 D 

## C), and salinity (parts per thousand 

## , ppt) were collected from the surface , mid-depth 

## and bottom water strata at the Bowline 

# Pond and one of the Haverstraw Bay stations during each survey. In addition 

## , water transparency readings using a 22. 9 cm (9. 

## in. 

## Secchi disk were recorded at the time the water quality samples were collected. 

## Date average values for the water quality parameters recorded from the ichthyoplankton 

## abundance monitoring program are presented in Table 4- 1. All water quality values 

## recorded during the survey are presented in Attachment A.

In general 

### , over the two and one- 

# half week monitoring period , water temperature 

## gradually increased from an average daily value of 24. 3 D 

## C recorded during 24 June to 26. 6 D 

### recorded during 8 July. 

# Dissolved oxygen exhibiting the typical inverse 

## relationship to water temperature 

## , decreased gradually over the same time period going 

## from 8. 

## 1 mg/l recorded during 22 June to 7. 1 mg/l recorded during 8 July. 

## Specific 

## conductance and salinity decreased initially reaching the lowest values during 1 July, and 

# then increased to the sampling period high recorded during 8 July. 

# The two values 

## indicate that some marine water was in the vicinity of the plant during the entire sampling period. Water transparency was 

## relatively good over the sampling period averaging 70. 

## , with a range of 48. 3 cm (29 June) to 95. 0 cm (6 July).

MB/l- 10-96 11:26am/h24618/169- 318/chap-4/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

## TABLE 4- 

# ICHTHYPLANKTON ABUNDANCE MONITORING PROGRAM

WATER QUALITY INFORMATION

WATER QUALITY PARAMETER SAMPLE 

### WATER DISSOLVED 

### SPECIFIC DATE TEMPERA TURE 

### OXYGEN 

### CONDUCTANCE 

### SALINITY TRANSPARENCY



### (C') (mg/I) (umbos/em (fP 

### 25 Co ) 

### (ppt) (em)

22 JuDe 94 

### 24. 3783 

### 2.4 62.

24 June 94 

### 24. 3597 

### 65.4 

### 27 June 94 25. 3474 

### 62. 

### 29 June 94 25. 2937 1.7 

### 48. 1 July 94 

### 25.4 2297 

### 1.0 76. 

### 6 July 94 26. 2297 1.3 95. 

### 8 July 94 26. 

### 4617 85.

### 1.2 Barrier Net Evaluation 

# Program

The fine mesh barrier net evaluation program commenced with ichthyoplankton sampling on 12 July and ended on 5 August. 

## Water temperature , dissolved oxygen , specific 

## conductance 

## , salinity, and water transparency data were recorded from the surface , mid

## depth 

## , and bottom water strata near the apex of the net twice during each plankton net sampling date. Date average water 

## quality information is presented in Table 4- , with 

## the complete listing of data presented in Attachment A. Water temperature gradually increased during the study period with the highest value of 28. 6 o 

# C recorded during 25 July, and the lowest value of 26. 6 o 

# C recorded during July. Dissolved 

## oxygen exhibited the inverse relationship to water temperature with the highest value recorded on 13 July (8. 3 mg/I), and the lowest 

## value recorded on 29 July (6. 2 mg/l). Specific 

## conductance and salinity were relatively stable over the four weeks 

# of evaluation sampling, with conductivity averaging 5380 JLmhos/cm (lJ) 

### 25 o 

### C and 

## ranging from 3775 to 6183 JLmhos/cm (jj)

25 o 

## C, and salinity averaging 3. 

## 1 ppt with a range from 2. 

## 3 ppt recorded during 29 July to 3. 

## 6 ppt recorded during 22 July. Water transparency varied slightly over the study period ranging from 62. 5 cm (13 July) to 93. 

## cm (20 July) and averaging 80. 0 cm.


## 2 BOWLINE POINT 

## GENERATING STATION UNIT OPERATION BPGS circulating water pump operation and associated flow for the period 1 June through 

## 31 August 1994 is presented in Table 4- 3. During the 

## period of fine mesh barrier net deployment (11 July - 4 August), Bowline Point operated one generating unit (Unit No. 

## 1) with two circulating water pumps. Daily plant flow was approximately 1.72 x1O6 m 

## (704. 2 cfs) during the net evaluation period. 

## Assuming a fine mesh barrier net mesh open area of 1 

## 068 m 2 (11 

## 500 fr2), the average through mesh velocity (for a clean net) at the start of the study period was calculated to be 1.87 cm/s (0. 

## 06 fps).


## 3 ICHTIIYOPLANKTON ABUNDANCE MONITORING PROGRAM
1 Inventory and 

## Abundance of Taxa Collected 

## The taxonomic listing and number of ichthyoplankton collected during the seven dates 

## when sampling was conducted at the two Haverstraw Bay stations and at the Bowline

MB/I- 10-96 11:26am/h24618/169- 318/chap-4/ 

# Lawler, Matusky & Skelly Engineers LLP

## TABLE 4- 

## FINE MESH BARRIER NET EV ALUA TION PROGRAM



## WATER QUALITY INFORMATION

WATER QUALITY PARAMETER 

### WATER DISSOLVED 

### SPECIFIC 

### SAMPLE 

### TEMPERATURE OXYGEN 

### CONDUCTANCE SALINITY 

### TRANSPARENCY 

### DATE (CO 

### (mg/I) 

### (umbos/em ~ 25 CO 

### (ppt) (em) 

### 12 July 94 26. 

### 6000 

### 3.4 70. 13 July . 

### 27. 

### 6050 62. 

### 15 July 94 26. 

### 7.4 5583 

### 83. 

### 18 July 94 

### 27.4 4872 75. 

### 20 July 94 28. 

### 7.4 5883 

### 93. 

### 22 July 94 28.4 6183 

### 81.0 

### 25 July 94 28. 

### 5200 77. 

### 27 July 94 28.4 

### 6.4 4925 72. 

### 29 July 94 28. 3775 

### 93. 

### 5 August 94 28. 5327 

### 92. 

## Date average of surface , mid- depth 

## , and bottom values.x = Operating circulating water pump TABLE 4-3 BOWLINE POINT GENERATING STATION CIRCULATING WATER PUMP OPERATION AND COOliNG WATER FLOW FINE MESH BARRIER NET EVALUATION STUDY: 1994 OPERATING CIRCULATING WATER PUMP COOLING WATER FLOW DATE Cubic Meters x 1D-'6) Gallonslx 1D-'6 1 June 94 722 455. 040 2 June 94 562 412. 560 3 June 94 567 414. 035 4 June 94 611 161. 330 5 June 94 570 1SO. 516 6 June 94 102 291. 019 7 June 94 401 370. 080 8 June 94 401 370. 080 9 June 94 401 370. 080 10 June 94 816 215. 598 11 June 94 440 118. 324 12June94 0.477 126. 115 13 June 94 209 563. 498 14 June 94 852 753. 569 15June94 802 740. 160 18 June 94 871 758. 4SO 17 June 94 937 776. 032 18 June 94 988 789. 365 19 June 94 606 741. 260 20 June 94 778 734. 073 21 June 94 920 771. 516 22 June 94 291 605. 275 23 June 94 651 438. 298 24 June 94 709 451. 475 25 June 94 587 419. 407 26 June 94 999 528. 148 27 June 94 394 696. 720 28 June 94 383 893. 898 29 June 94 381 687. 948 30 June 94 3.422 904. 035 1 July 94 076 612. 550 2 July 94 012 531. 575 3 July 94 722 455. 040 4 July 94 999 528. 054 5 July 94 961 782. 414 6 July 94 052 606. 210 7 July 94 224 85 1 . 898 8July 94 417 902. 764 9 July 94 445 910. 080 10 Julv 94 554 674. 720 11 July 94 722 455. 040 12July94 898 448. 530 13 July 94 708 451. 320 14 July 94 722 455. 040 15 July 94 722 455. 040 18 July 94 722 455. 040 17 July 94 722 455. 040 18July94 722 455. 040 19 July 94 722 455. 040 20 July 94 722 455. 040 21 July 94 722 455. 040 22 July 94 722 455. 040 23 July 94 748 481. 681 24 July 94 722 455. 040 25 July 94 722 455. 040 26 July 94 722 455. 040 27 July 94 722 455. 040 28 July 94 722 455. 040 29 July 94 722 455. 040 30 July 94 722 455. 040 31 July 94 722 455. 040 1 August 94 722 455. 040 2 August 94 722 455. 040 3 August 94 722 455. 040 4 Auoust 94 722 455. 040 5 August 94 722 455. 040 6 August 94 722 455. 040 7 August 94 297 606. 960 8 August 94 369 690. 168 9 August 94 832 484. 065 10 August 94 722 455. 040 11 August 94 722 455. 040 12 August 94 722 455. 040 13 August 94 722 455. 040 14 August 94 722 455. 040 15 August 94 722 455. 040 16 August 94 722 455. 040 17 August 94 722 455. 040 18 August 94 722 455. 040 19 August 94 722 455. 040 20 August 94 645 487.415 21 August 94 404 699. 489 22 August 94 001 792. 659 23 August 94 932 774. 505 24 August 94 394 896. 716 25 August 94 293 605. 615 26 August 94 722 455. 040 27 August 94 722 455. 040 28 August 94 722 455. 040 29 August 94 722 455. 040 30 August 94 722 455. 040 31 August 94 722 455. 040

## Pond station under the ichthyoplankton 

## abundance monitoring program stage of the fine mesh barrier net evaluation program are presented in Table 4-4. 

## Collection infonnation for each sample is presented in Attachment B. total of six families 

### and 2402 

## individuals were represented in the ichthyoplankton 

### abundance monitoring program 

## samples. The greatest number of larvae were 

## collected at the Bowline Pond Inlet station (1657 individuals 

## , 69. 

## 0% of the total), and the fewest number of larvae were collected 

## at the Bowline Pond station (214 individuals , 8. 

# 9% of the total). A total of 531 larvae 

## were identified from the 

## Haverstraw Bay station accounting for 22. 1 % of the 

## total 

## number of larvae collected. 

# 3~2 Ichthyoplankton Abundance and Concentration The dominant taxonomic group identified was Morone spp. consisting of striped bass
(Morone saxatilis) and white perch (Morone americana). 

## Striped bass larvae dominated

the Morone 

## collections accounting for greater than 

# 90% of the 1406 Morone 

## larvae 

## collected. The greatest percentage of the Morone 

## spp. larvae (1098 individuals 

## , 78. 1 % 

## of the total) were collected during the first date (22 June) of the monitoring program 

# with the highest concentrations noted at the 

# two Haverstraw Bay stations (1090 

## individuals 

## , 99. 3 % of date total) (Table 4- 5). Following the 

### abundance peak recorded during 22 June , the number of Morone 

## spp. larvae declined dramatically, with only one 

## larvae identified from the last collection date - 8 July.

Bay anchovy (Anchoa mitchilli) (the target species for the barrier net evaluation 

# program), with 825 individuals (34. 

# 3% of the total), was the second most abundant 

## ichthyoplankton taxon collected during the ichthyoplankton 

## abundance monitoring 

# program (Table 4- 

## 4). The abundance of bay anchovy larvae increased over the 

## monitoring period with the highest numbers generally collected during the last sampling date - 8 July (Table 4- 

### 6). Overall 

# , higher concentrations were recorded from the Haverstraw Bay stations (698 individuals 

## , 84. 

## 6% of the total) especially the Bowline Pond Inlet station where 447 individuals or 54. 2 % of the total were collected.

Hogchoker (Trinectes macula/us) 

## (53 individuals , 2. 

## 2 % of the total), and river herring 

## (Clupeidae) (29 individuals , 1. 

## 2 % of the total) larvae ranked third and fourth in total abundance 

# , respectively. The relative abundance of hogchoker and river herring larvae was low , with the greatest 

# number of both taxa collected from Bowline Pond. The greatest number of hogchoker (Table 4- 

## 7) larvae was collected during the last date of the

MB/I- IO-96 11:27am1h24618/169- 318/cbap-4/ 

## Lawler 

# , Matusky & Skelly Engineers LLP...TABLE 4-4ICHTHYOPLANKTON ABUNDANCE MONITORING PROGRAMSPECIES INVENTORY AND ABUNDANCE22 JUNE- 8JULY 1994ICHTHYOPLANKTON SPECIES INVENTORYNUMBER COLLECTED BY SAMPLING LOCATIONBOWLINE PONDTOTALFAMILYSCIENTIFIC NAMECOMMON NAMEBOWLINE PONDINLETHA VERSTRA W BAYCOLLECTEDAlherinidaeMenidialLabideuthesspp.SilversidesClupeidaeAlosa/Brevoortiaspp.HerringsCyprinidaeNotropisspp.MinnowsEngraulidaeAnchoa mitchilliBay anchovy127447251825PercichthyidaeMorone americanaWhile perchMorone sa:catilisStriped bass10591931272Moronespp.Perch/BassSoleidaeTrinectes maculatusHogchokerIchlhyoplanklOnUnidentifiedTotal IchlhyoplanklOn21416575312402Total TaxaMonilOring program conducled using am moulh diameler planklOn nel wilh 500 pm mesh.

## TABLE 4- 

## ICHTHYOPLANKTON ABUNDANCE MONITORING PROGRAM ABUNDANCE AND CONCENTRA nON OF MORONE 

## SPP.

SAMPlE STATION 

### HAVERSTRAW BAY BOWLINE POND INLET BOWLINE POND SAMPLE 

### NUMBER ICONCENTRATION 

### NUMBER I CONCENTRATION NUMBER I I CONCENTRATION DATE COLLECTED No. 1000 m 

### COLLECTED No. 1000 m COLLECTED No. 1000 m


### 22 June 94 

## 139 

## 617. 951 41 97. 

## 32.43

24 June 94 

## 115. 163. 

## 33.

27 June 94 

## 68. 

## 40.

29 June 94 

## 119. 

## 201.45 25. 

## 1 July 94 209. 

## 386. 

## 6 July 94 16. 

## 8 July 94 13 July 94 

## 20 July 94 27 July 94

NS = No Sample

## ichthyoplankton monitoring program while river herring (Table 4- 

## 8) larvae were more



## abundant during the first sampling date.
3 Length- 

# Frequency Information Length- frequency information for the ichthyoplankton abundance monitoring program was 

## recorded for each sampling week based on a 

## composite sample. In addition 

## , for each week of the barrier net evaluation program , length frequency information for the Bowline 

## Pond Inlet station was maintained separately. Length- frequency information for bay 

# anchovy 

# larvae from the ichthyoplankton 

## monitoring program is presented in Table 4- 

### 9. The 

## length frequency data 

## indicates 

## continuous recruitment of young larvae in the Haverstraw Bay section of the Hudson River especially during the period 1- 

## 20 July. The length data also suggests two separate 

## spawning events in Haverstraw Bay or the passage of two separate cohorts through the area during the 1994 evaluation period. 

## 4.4 FINE MESH BARRIER NET EFFECTIVENESS MONITORING PROGRAM 4.4. 1 Inventory and 

## Abundance of Taxa Collected 

## The listing of the ichthyoplankton taxa identified and their abundance by station for the 

# fine mesh barrier net evaluation program is presented in Table 4- 

# 10. Collection 

## information by sample location and date is presented in Attachment B. 

## A total of five families were identified in the ichthyoplankton samples. The 

## greatest number of larvae 

## were collected by the four- inch trash pump at the cooling water intake , and the lowest 

## number were collected by the 0. 

## 5 m plankton net at the inside barrier net station. Similar 

## numbers of larvae and taxa were recorded at the two stations located outside the barrier net. The 

## taxa and abundance collected at the Bowline Pond Inlet station during the barrier net evaluation sampling period 

# is presented in Table 4- 10 for comparison 

## purposes.

4-4 MB/I- IO-96 11:28am/h246181169- 318/ch.ap4/ 

# Lawler, Matusky & Skelly Engineers LLP

## TABLE 4- 

## ICHTHYOPLANKTON ABUNDANCE MONITORING PROGRAM ABUNDANCE AND CONCENTRATION OF BAY ANCHOVY

SAMPlE STATION 

### HAVERSTRAW BAY BOWLINE POND INLET BOWLINE POND SAMPLE NUMBER I I CONCENTRATION 

### NUMBER I CONCENTRATION NUMBER ) I CONCENTRATION DATE COLLECTED No. 1000 m 

### COLLECTED No. 1000 m COLLECTED No. 1000 m 

## 22 June 94 

## 288. 123. 

## 36. 24 June 94 

## 43. 

## 356. 

## 8.48 27 June 94 18. 

## 150. 15. 29 June 94 

## 419. 107. 

## 30. 

## 1 July 94 

## 6 July 94 45. 34. 

## 38. 

## 8 July 94 245. 

## 266 

## 1031.90 386. 

## 13 July 94 741 

## 2717. 

## 20 July 94 139 

## 548. 

## 27 July 94

NS = No Sample



### 4-4A

## TABLE 4- 

## ICHTIlYOPLANKTON ABUNDANCE MONITORING PROGRAM ABUNDANCE AND CONCENTRATION OF HOGCHOKER

SAMPlE STATION 

### HAVERSTRAW BAY BOWLINE POND INLET BOWLINE POND SAMPlE 

### NUMBER I CONCENTRATION 

### NUMBER I CONCENTRATION 

### NUMBER I CONCENTRATION DATE 

## COLLECTED No. /1000 m 

### COLLECTED No. /1000 m 

### COLLECTED No. /1000 m
22 June


## 24 June
27 June
29 June 1 July 94 

## 6 July 94 8 July 94 18. 

## 42. 

## 139.40 13 July 

## 117. 20 July 

## 27 July

NS = No Sample



### 4-4B

## TABLE 4- 

## ICHTHYOPLANKTON ABUNDANCE MONITORING PROGRAM ABUNDANCE AND CONCENTRATION OF CLUPEIDAE

SAMPlE STATION 

### HAVERSTRAW BAY BOWLINE POND INLET BOWLINE POND SAMPlE NUMBER I I CONCENTRATION 

### NUMBER I CONCENTRATION NUMBER I CONCENTRATION DATE COLLECTED No, 1000 m 

### COLLECTED No. 1000 m COLLECTED No. 1000 m 

### 22 June 94 

## 26. 

## 32. 24 June 94 15. 12. 

## 16. 27 June 94 29 June 94 

## 4.48 1 July 94 

## 6 July 94 8 July 94 13 July 94 

## 20 July 94 27 July 94

NS = No Sample



## 4-4C

### Table 4- 

### ICHTHYOPLANKTON ABUNDANCE MONITORING PROGRAM BAY ANCHOVY LENGTH FREQUENCY INFORMATION
LENGTH 

### SAMPLE DATE INTERVAL 

### (mm) 24 JUN 

### 1 JUL 

## 8JUL 13 JUL 20 JUL 

### 27 JUL

10. 10, 

### 10. 10. 

### 11, 11. 

### 11. 11. 

### 12. 12, 12. 12. 

### 13. 13. 

### 13. 13. 

### 14. 14. 

### 14. 14, 15, 15. 

### 15, 15. 

### 16. 16, 

### 16. 16. 

### 17. 17. 

### 17. 17, 

### 18. 18. 

### 18. 18, 19. 19. 

### 19. 19. 

### 20, 20. 

### 20. 20. 

## 21.
TOTAL ANALYZED 

### 100 

### 100 TOTAL CAUGHT 

## 200 168 

## 457 741 

## 139 MINIMUM LENGTH 

### MAXIMUM LENGTH 16. 

### 20. 18. 16. 

### 13. 11, MEAN LENGTH 13. 

### 10.



### 4-4D+--.t:..t'11TABLE 4-FINE MESH BARRIER NET EV ALVATION PROGRAMSPECIES INVENTORY AND ABVNDANCEBY LOCATIONNUMBER COLLECTED BY LOCATIONOUTSIDE BARRIER NET SAMPLINGINSIDE BARRIER NET SAMPLING STATIONSST ATIQNSINSIDENORTHSOUTHBOWLINECOOLING WATERPLANKTONPLANKTONPLANKTONPONDICHTHYOPLANKTON SPECIES INVENTORYINTAKE PUMPNETNETNETINLETAtherinidaeMenidialLabideslhessppSilversidesMenidia menidiaAtlantic silversideEngraulidaeAnchoa milchilliBay anchovy509335300882GobiidaeGobiosomasppGobyPerichlhyidaeMorone saxalilisSlriped bassSeleidaeTrinecles maculalusHogchokerIchthyoplanklonUnidentifiedTotal Larvae578395339927Total Taxa

## 4.4. 

# Ichthyoplankton Abundance and Concentration

The dominant taxon collected during the period of the fine 

# mesh barrier evaluation 

## program was the bay anchovy with 1213 individuals accounting for 86. 

## 3% of the total larvae (1406 individuals) collected (Table 4- 10). Abundance and 

## concentration of bay anchovy larvae by sampling location is presented in Table 4- 11. The 

## greatest number 

## and highest concentrations of bay anchovy larvae for the period prior 

## to the deployment of the fine mesh barrier net (12- 

## 13 July) and for the deployment period (15- 

## 29 July) were 

## noted at the BPGS Unit 1 cooling water intake location. 

### A total of 

## (509 individuals 

## 42. 

## 0% of bay anchovy total). Similar numbers and concentrations of bay anchovy larvae were recorded at the two stations located outside of the barrier net both prior to and after barrier net 

## deployment. 

## The second most abundant taxon identified under the barrier net evaluation program was the hogchoker 

## (Table 4- 

# 10) with 146 individuals collected or 

## 10.4 % of the 

## total 

# ichthyoplankton. Abundance and concentration by 

## sampling location is presented in Table 4- 

# 12. Similar numbers and concentrations were collected at the BPGS intake 

## station and at the two stations located along the outside of the barrier net. Collection 

## similarities at the intake and outside stations were consistent prior to net deployment and 

## after the net deployment was complete. 

## 4.4. 3 Length- 

# Frequency Information Length frequency infonnation for bay anchovy larvae collected inside barrier net (pump and plankton net samples combined) sampling locations is presented in Table 4- 

## , and the length frequency information for bay anchovy larvae collected at sampling locations outside of the barrier net (outside 

# nonh and south stations combined) is presented in Table 4- 

# 14. Length frequency information from each sampling location and date is presented in Attachment C. 

## Generally very few larvae were collected by the plankton net sampling inside the barrier net. There was no 

## difference noted between the length of bay anchovy larvae collected by the inside plankton net and by the intake pump sampler (Table 4- 

# 13). Mean length 

## of larvae consistently increased over the study period. Very few individuals collected were categorized as post yolk-sac larvae or were in the length range where the fine mesh 

## barrier net would have the greatest exclusion potential.

MB/I- IO-96 11 :29am1h24618/169- 318/chap-4/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

## TABLE 4- 

## FINE MESH BARRIER NET EV ALUA 

## TION PROGRAM ABUNDANCE AND CONCENTRATION OF BAY 

## ANCHOVY
BARRIER NEI' OUI'SIDE BARRIER NEI' OUTSIDE BOWLINE POINT INT AXE BARRIER NEI' INSIDE 

### NORm so UfH 

### NUMBER I CONCENTRATION 

### . NUMBER I CONCENTRATION 

### NUMBER I CONCENTRATION NUMBER , ~CONCENTRATION DATE 

## COlLECTED No./l000 m 

## COlLECTED No./l000 m3 

## COlLECTED No./l000 m3 

### COlLECTED No.llOOO m3
12 July 94 106 3111.37 1974. 152 2774. 1231.03
13 July 94 1937. 105. S80. 90 1318.

111 . 3258. 852. 1416. 117.
15 July 94 1350. 36. 292. en 61.23 1144. 420. 406. 763.
18 July 94 675. 20. 43. 205. 100. 78. 146.
20 July 94 117.41 61.42 335. 560. 99 58. 182. 270. 29.
22 July 94 440 . 29 39. 37. 123. 264. 76. 55. 88.
25 July 94 205.47 70. 35. 410. 57. 49. 58.

rT July 94 58. 39. 37. 95. 117. 36.

29 July 94 29. 40. 17. 88. 79. 19. 29.
Augmt 94 234.

## TABLE 4- 

## FINE MESH BARRIER NET EV ALUA 

## TION PROGRAM ABUNDANCE AND CONCENTRATION OF HOGCHOKER
BOWLINE POINT INT AXE BARRIDt NET INSIDE BARRIDt NET OUI'SIDE BARRIDt NET OUTSIDE 

### NORm 

## soum DATE 

### NUMBER I CONCE'lTIlATION 

### NUMBER I CONCE'lTIlATION 

### NUMBER I CONCE'lTIlATION NUMBER I CONCE'lTIlATION 

## COLLECTED No. /1000 m3 

### COLLECTED No. /1000 m3 

### COLLECTED No. 1000 m3 

### COLLECTED No. 1000 m3
12 July 94 264. 582. 474. 144. 13 July 94 146. 175. 123. 19. 117. 89. 1 77. 08 29. 15 July 94 117. 36. 18. 88. 95. 73. 58. 18 July 94 43. 60. 87. 58. 20. 58.

20 July 94 58. 20. 29. 20. 41.59

22 July 94 18.88 29. 18.

25 July 94 35. 29.

ZI July 94

29 July 94 34.

5 AlJ8U!t 94

### Table 4-13 BAY ANCHOVY LENGTH INTERVAL INFORMATION PUMP SAMPLES AND PLANKTON NET SAMPLES COLLECTED INSIDE THE BARRIER NET - 

### 1994

LENGTH SAMPLE DATE INTERVAL (MM) 

### 12 JUL 13 JUL 15 JUL 18 JUL 20 JUL 22 JUL 25 JUL 27 JUL 29 JUL 

### 5AUG 5-4. 1-4. 6-5. 6-6. 1-6. 6-7. 6-8. 1-8. 6-9. 6-10. 10. 10. 10. 6-11. 11. 11. 11. 

### 6-12. 12. 12. 12. 6-13. 13. 13. 13. 

### 6-14. 14. 14. 14. 

### 6-15. 15. 15. 15. 6-16. 16. 16. 16. 

### 6-17. 17. 17. 17. 

### 6-18. TOTAL ANALYZED TOTAL CAUGHT 167 184 112 MINIMUM LENGTH 

### MAXIMUM LENGTH 12. 12. 15. 12. 13. 13. 15. 12. 16. 14. MEAN LENGTH 

### 10.4 11. 11.Table 4- BAY ANCHOVY LENGTH INTERVAL INFORMATION PLANKTON NET SAMPLES COLLECTED OUTSIDE THE BARRIER NET - 1994

LENGTH 

### SAMPLE DATE INTERVAL (MM\ 

### 12 JUL 13 JUL 15 JUL 18 JUL 20 JUL 22 JUL 25 JUL 27 JUL 29 JUL 

### 5-4. 1-4.

6-B. 1-B.

10. 10. 10. 10. 11. 11. 11. 11. 12. 12. 12. 12. 13. 13. 13. 13. 14. 14. 14. 14. 15. 15. 15. 15. 16. 16. 16. 16. 17. 17. 17. 17. 18. TOTAL ANALYZED 

### 120 TOTAL CAUGHT 

### 220 227 MINIMUM LENGTH 

### 5.4 MAXIMUM LENGTH 12. 12. 10. 11. 13. 12. 12. 14. MEAN LENGTH 

### 7.4

## Similar numbers and lengths of bay anchovy larvae were recorded at the two outside



# barrier net plankton net sampling stations (Table 4- 

# 14). Mean lengths were consistent among sampling dates ranging from 6.4 mm on 13 July to 9. 

## 3 mm on 27 July. Yolk-sac 

## recruitment was noted fairly continuously over the two week study period.

The date average length of bay 

## anchovy larvae collected outside of the deployed barrier 

## net were smaller than those collected inside the barrier net. 

## The minimum lengths of 

## larvae collected inside and outside the fine mesh barrier net during the same sampling 

## date were similar , however 

## , generally larvae with a larger maximum size were collected at the inside locations compared to the outside 

## locations on the same date.

4.4.4 Inside Barrier Net 

## Velocity PronIes Velocity profiles were conducted inside the deployed fine mesh barrier net on three dates 

## during the net evaluation program. The velocity profiles were scheduled at regular 

## intervals over the net 

## deployment period to determine if 

## decreasing net filtration as a result of sediment clogging or biofouling could be determined. Velocity monitoring was 

## conducted during three dates with velocity recorded at one meter intervals from surface to bottom at two locations; along the north side of the net between piles N- 2 nd N- 

## , and 

## along the south side of the net between piles S- 2 and S- 3. Velocity 

## profile information 

## is presented in Table 4- 15. 

## The first monitoring date was 15 July which was two days following the completion of fine mesh barrier net deployment. Velocities were similar by location averaging 2. 

## 31 and

04 cm/s 

## (0. 

## 076 and 0. 

# 067 fps) on the north and south sides respectively, with an overall average of 2. 17 cm/s 

## (0. 

# 07 fps). No substantial depth difference in velocity was noted at 

# either 

# location. Velocity profiles were 

# next recorded on 20 July at approximately the same locations and water depths. The average water velocity for the two locations was 2. 91 cm/s 

## (0. 

## 095 fps), with north and south location averages of 3.

cm/s 

## (0. 

## 104 fps) and 2. 65 cmls 

## (0. 

# 087 fps), respectively. The difference in velocity noted between the two 

# locations was primarily the result of lower surface velocities 

## recorded at the south side location possibly due to net clogging. By the third velocity 

## recording date 27 July the difference between the north and south side locations was more 

## pronounced; averaging 2. 36 cm/s 

## (0. 

## 077 fps) on the north side , and 1.45 cm/s 

## (0. 

## 048 

## fps) on the south side. The overall average velocity was 1.94 cm/s (0. 064 fps). During

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### ll- 96 3:34pm1h246181169- 318/cbap-4/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

### 4-6A TABLE 4-15 FINE MESH BARRIER NET EVALUATION PROGRAM - 1994 INSIDE BARRIER NET VELOCITY PROFILES 

### DATE 15 J I 1994

UIV Station Recording Depth Depth Velocity Location Time (m) (m) (cmls) Between Piles N- 2 and N- 

### 0915-0925 

### 823 164 164 

### 408 408 871 

### Between Piles S- 2 and S- 

### 0936-0945 164 164 164 621 

### 164 

### 975


### DATE: 20 July 1994 Station Recording Depth Depth Velocity Location Time (m) (m) (cmls) Between Piles N- 2 and N- 1422- 1432 

### 597 871 

### 408 597 621 

### 896 Between Piles S- 2 and S- 1412- 1419 

### 164 

### 890 139 

### 408 383 896
DATE: 27 July 1994 Station Recording Depth Depth Velocity Location Time (m) (m) (cmls) Between Piles N- 2 and N- 1553-1605 

### 189 139 

### 408 267 164 164 189 

### Between Piles S- 2 and S- 1540-1551 

### 164 

### 433 164 

### 975 975 975

## monitoring on 27 July the lowest velocities were recorded at the bottom on the south side



## with relatively high values recorded on the north side. It should be noted that the Unit No. 1 circulating water pumps were operating during the 

## study period and these are located on the north side of the intake building, and that the barrier net is slightly closer to the intake building on the north side compared to the south side. The other 

## interesting observation is that the field crew noted heavier biofouling between the apex and the south bulkhead compared to between the apex and the north 

## bulkhead. 

## 5 . BAY ANCHOVY BODY LENGTH TO BODY 

## DEPTH RELATIONSHIP 

# Total body length and body depth measurements were recorded on 612 bay anchovy 

# larvae collected during the period 22 June through 5 August. 

# The results of the 

## measurements is presented in Attachment D. The linear regression of total body length versus body depth for bay 

## anchovy collected during the 1994 fine mesh barrier net evaluation program was determined to be:

Body Depth (BD) 

# = 0. 05021L1. 2OO89 

## The R squared value for the equation is 0. 85674. The 

## regression equation developed for bay anchovy 

# larvae collected during 1994 from Haverstraw Bay and Bowline Pond 

## predicts that a larvae measuring 13. 

## 0 mm in total length would have a body depth of 1. , and a larvae measuring 17. 

## 0 mm in total length would have a body depth of 1.5 

# mm. For bay anchovy larvae of the same length , a smaller body depth value is predicted 

## based on the 1994 study data compared to the predicted body depth value based on the 

## 1993 study data.

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### ll- 96 3:34pmlh24618/169- 318/cbap-4/ 

## Lawler, Matusky & Skelly Engineers LLP

## CHAPTER 5 DISCUSSION AND CONCLUSIONS



## 1 GENERAL PROGRAM DESCRIPTION Orange and Rockland Utilities 

## , Incorporated (ORU) contracted Uiwler , Matusky & Skelly 

## Engineers LLP (LMS) to conduct a seasonal ichthyoplankton monitoring program which 

## would be used to evaluate the effectiveness of a fine mesh barrier net deployed at the 

## cooling water intake of the 

## Bowline Point 

# Generating Station (BPGS). Barrier net 

## effectiveness would be determined by comparing bay anchovy larval abundances between sampling stations located inside and outside of the deployed barrier net. 

## The seasonal 

## monitoring program consisted of two study phases; Phase I termed the Ichthyoplankton 

## Abundance Monitoring Program , and Phase 

# II termed the Barrier Net Evaluation 

## Program. 

# Under Phase I , plankton net sampling was conducted 

# at two stations located in 

## Haverstraw Bay (Haverstraw Bay (HBJ and Bowline Pond Inlet (BPI)) offshore of the BPGS 

## , and at a station located in Bowline Pond (BP) - the source of 

## BPGS condenser 

## cooling water - to determine the presence and general abundance of bay anchovy larvae in the vicinity of 

# BPGS. The ichthyoplankton abundance monitoring program was incorporated into the barrier net 

## evaluation program to assist in determining the period of greatest bay anchovy abundance in the BPGS vicinity which would be used to initiate the deployment of the fine mesh barrier net and the ichthyoplankton monitoring program 

# designed to determine barrier net 

# effectiveness. During the abundance monitoring 

## program piles were 

## installed in Bowline Pond around the BPGS cooling water intake 

# structure in preparation for the rapid deployment of the fine mesh barrier net when 

## ichthyoplankton abundance levels indicated. Phase II incorporated ichthyoplankton sampling using 0. 5 m mouth diameter plankton nets 

## and a four inch trash pump, with the sampling designed to yield information useful in 

## determining the effectiveness of the fine mesh barrier net at limiting the movement of ichthyoplankton in the immediate vicinity of the BPGS cooling water intake structure. In general 

## , following deployment of the fine mesh barrier net , plankton samples were
collected at two stations located outside of the barrier net and at 

## two stations located

MB/I- IO-96 11:43am1b24618/169- 318/cbAp-5/ 

## Lawler 

# , Matusky & Skelly Engineers LLPinside of the barrier net , with net effectiveness related to 

## comparing the collection



## information between the two locations.
2 DISCUSSION OF 

## PROGRAM RESULTS

1 Ichthyoplankton 

## Abundance Monitoring Program 

## The ichthyoplankton abundance monitoring program commenced on 22 June 1994 

## , the 

# date when LMS received its collection permit from the 

# NYSDEC. Abundance monitoring was conducted during seven dates with a 

# total of 27 composite samples 

## collected (composite of surface and bottom lO-min plankton net tows). A total of 2402 larvae were collected , with Morone spp. (white perch , striped bass) the 

## major taxa identified accounting for 58. 5 % (1406 individuals) of the total. 

## The greatest percentage

of the Morone 

## spp. larvae were collected during the first few sampling dates 

## , with very few recorded during the final days of sampling. Bay anchovy - the target species for the fine mesh barrier net evaluation program - was the second most abundant taxon identified 

## in the monitoring program samples with 825 individuals or 34. 3 % of the total.
Overall 

## , the abundance level of all larvae including bay anchovy was lower in Bowline 

## Pond compared to Haverstraw Bay, with the highest Haverstraw Bay ichthyoplankton 

## abundances recorded at the Bowline Pond Inlet station. For the bay anchovy larvae 

## similar trends in increasing abundance levels with time were recorded at both Haverstraw 

## Bay and the Bowline Pond stations. The average length of bay anchovy larvae during the first week of abundance monitoring (22- 

## 24 June) was 9.4 mm (range 5. 3 - 16. 

## 6 mm), the average length increased to 13. 

## 6 mm (range 5. 

## 8 - 20.4 mm) during the second week (27 June- 

## l July) of abundance monitoring, and during the third week of monitoring, the week immediately prior to deployment of the fine mesh barrier net, the average length decreased to 6. 

## 8 mm (range 3.4 - 18. 2 mm) (5- 8 July). 

## Water temperature gradually increased during the ichthyoplankton abundance monitoring 

## program ranging from 24. 3 to 26. 6 o 

### c. Water 

## temperature values were similar between Bowline Pond and Haverstraw Bay during the first five sampling dates , however 

## , during 

## the last two dates higher water temperatures were recorded in Bowline Pond compared to Haverstraw Bay. Specific 

## conductance and salinity readings indicated the presence of 

## marine waters in the study area during the entire monitoring program period. During the first five days of the ichthyoplankton abundance monitoring program specific conductance

MB/I- IO-96 11 :49am1h24618/169- 318/clap-S/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

## Ichthyoplankton sampling related to the 

# fine mesh barrier net evaluation study



## commenced on 12 July and continued through 5 August. Samples collected on 12 and 13 July were collected prior to the completion of barrier net installation 

## , and the samples 

# collected on 5 August were 

# collected the day following barrier net removal. 

## Ichthyoplankton samples were collected during a total of seven diurnal periods when the fine mesh barrier net was in place. 

## Over the ten sampling dates, a total of 72 composite 

## samples were collected - 26 intake pump samples, 10 inside barrier net plankton net 

## samples , and 36 outside barrier net plankton net 

# samples. A total of 1406 larvae were collected during the ten sampling dates , the dominant taxon collected was bay anchovy, 

## with ' 1213 individuals representing 86. 

## 3% of the total. 

## The average daily concentration of bay anchovy larvae inside the barrier net based on pump and net samples were plotted (Figure 5- 

## 1) to establish comparability. In general 

## the same trend in bay anchovy concentrations is indicated by the two sampling methods however , the pump consistently indicates higher concentrations of larvae. 

## Overall when 

## bay anchovy larval concentrations were relatively high - 

## as noted during the first sampling date - there was less difference between the two collection techniques , however 

## when larval concentrations were low the pump sampler was the more efficient sampling 

# device. No difference was noted in the daily average 

### bay anchovy 

## concentrations 

## determined for the outside barrier net north and south stations (Figure 5- 2). 

## The greater concentration of bay anchovy larvae based on the pump samples could be related to the difference in number of samples collected, but is more likely the result 

## greater sampling efficiency associated with the pump. During the sampling dates when 

## the barrier net was not fully deployed (12 

## 13 July and 5 August) similar concentrations 

# of bay anchovy larvae were noted at inside and outside locations 

## , however , as noted 

## previously, the pump resulted in consistently higher values. The average daily concentration of bay anchovy larvae collected outside of the barrier net 

## based on plankton net samples was compared to the average daily concentration of bay anchovy larvae collected by the pump inside of the barrier net (Figure 5- 3). Given 

## the short duration of the 

# 1994 study period and 

# the relatively low abundance of ichthyoplankton in the vicinity of BPGS , the following conclusions can be made with 

## respect to the effectiveness of the fine mesh barrier net:

5-4 MB/I- IO-96 11:49am1h24618/169- 318/chap-5/ 

# Lawler, Matusky & Skelly Engineers LLP~ 3000 ...................................................................................................,................................................................................,............................................

g 2500 ................... ...............................................................,...................................................................................................,..........................................

or- 

## ~ 2000
~ 1500 a:: 

## 1000 

## 500 

# 3500 Figure 5-



# BAY ANCHOVY CONCENTRATION

INSIDE BARRIER NET STATIONS ...... ................ ........................ ,...............................-..........................................................._ ........................................-........................................ ............'. ......................... ............................................................................................",......................................................................................." .................... ...........,........................ ...................................-.............................................................,.............".......................................................



### 12 Jul 13 Jul 

### 15 Jul 18 Jul 

### 20 Jul 

### 22 Jul 25 Jul 

### 27 Jul 29 Jul 

## 5 Aug 

# SAMPLING DATE 

# ---

PUMP---- NET



### 5-4A

## 3000 .......

('f) -=:



## ~ 2500

-r

## 0 2000 '-'"



## 1500
oe:( 

## 000
() 500 

# Figure 5- 

# BAY ANCHOVY CONCENTRATION OUTSIDE BARRIER NET STATIONS .."""" """"""""""""...............................",.................................. 

### """""""""""""""""""""""""""""""""""""""""""""""""" ............... .............................................................................................................................."""""""""""""""""""""""""""""'" 

### """""""""'" ..............................................................................................................-....................................................................... .......................... ....... ......---....................................................""""""""""""""""""""""""""""""""'""""""""""""""""""""'-



### 12 Jul 13 

### Jul 15 

### Jul 18 Jul 20 Jul 22 Jul 25 

### Jul 27 Jul 29 

### Jul 5 Aug



# SAMPLING DATE 

# ---

NORTH ---- SOUTH



### 5-4B

## 3500 Figure 5-



# BAY ANCHOVY AVERAGE CONCENTRATION

~ 3000 .......... .......................................................................................................................................................................................................................

g 2500 ................... ..................................................... .........................................................................................................................................................

T"" 

## ~ 2000


## 1500 0::

rEi 1 

## 000
500 ...... ................ ......................................................................................................................................................................................................



### 12 Jul 

### 13 Jul 15 Jul 18 Jul 

### 20 Jul 

### 22 Jul 25 Jul 

### 27 Jul 

### 29 Jul 

## 5 Aug 

# SAMPLING DATE

--- INSIDE 

# ---

OUTSIDE



### 5-4C

## There was no difference in 

## concentration of bay anchovy larvae between inside and outside locations when the barrier net was not deployed or when the deployment was not complete. . The 

## average daily concentration of bay anchovy larvae collected inside the deployed barrier net was not significantly different from the 

## average daily 

## concentration of bay anchovy larvae collected outside the barrier net. 

### . The 

## relationship between bay anchovy larval concentrations based on intake 

## pump samples did not change over the duration of the barrier net evaluation 

## program to the concentration based on outside plankton net samples. 

## In general 

## , the number of bay anchovy larvae present in the study area at the end of the 

## ichthyoplankton abundance monitoring program and during the first 

# few days of the barrier net evaluation program study period were sufficient to determine the effectiveness 

## of the fine mesh barrier net , however 

## , the abundance of bay anchovy larvae decreased rapidly following barrier net 

## deployment severely limiting the ability to determine net effectiveness. Net biofouling during 1994 

## , which limited the duration of the study 

## period, may also have contributed to the limited ability to detect barrier net effectiveness 

## since more larvae may have entered the study area following the first week of August.


## 3 CONCLUSIONS The following conclusions can be reached with respect to the deployment of a fine mesh 

# barrier net in Bowline Pond and evaluation of the net as 

### a means of 

## limiting 

## ichthyoplankton entrainment in the Bowline Point Generating Station cooling water:


# . A 

# fine mesh barrier net (3. 

# mm mesh) can be deployed around the 

## Bowline Point Generating Station cooling water intake structure without limiting use of Bowline Pond and with no operating restrictions on BPGS cooling water pump operation. 

## Fine sediment clogging and biofouling growth over time limit the water filtration capacity of the net which effectively limits the duration the net can be deployed without maintenance.


### Fine sediment clogging of the 

## mesh can be cleaned using high pressure 

# water jets with the net fully deployed. (NOTE: Underwater cleaning of

MB/l-4-96 3:37pmlh24618/169- 318/chap-5/ 

## Lawler 

# , Matusky & Skelly Engineers LLP

# the net requires divers and is very inefficient as to 

# time and areal 

## coverage. 

## Biofouling growth is not 

# effectively cleaned with the net deployed , but can be effectively 

## removed with the net out of the water.

. The 

## bay anchovy, based on dominance of the ichthyoplankton in the vicinity 

## of BPGS 

# , was selected as the target species for the determination of the effectiveness of the fine mesh barrier net. 

## Overall bay anchovy abundance 

## levels recorded during 1993 and 1994 have been very low 

## , and the period 

## during which the population is present in the 

## BPGS vicinity has been of . short duration. The low abundance levels and short period of presence in the study area have limited the ability to determine the effectiveness of the 

## fine mesh barrier net. 

# 5.4 RECOMMENDATIONS


# . A regularly scheduled net maintenance 

# program should be instituted 

## incorporating net removal and cleaning using high pressure water sprays. Net maintenance should occur at approximately two week intervals.
Barrier net deployment should occur early during the ichthyoplankton 

## season in order to have sufficient numbers of ichthyoplankton upon which to determine 

# barrier net effectiveness. In addition 

### , a comprehensive 

## sampling program should be undertaken , with similar sampling techniques 

# at inside and outside net locations 

### , to 

# adequately determine net effectiveness.
Consideration should be given to 

### dipping or 

## treating the barrier net. 

## Dipping would result in greater protection from clogging and biofouling and 

## would also result in some reduction in the size of the mesh opening.

MB/l-4-96 3:37pm1h24618/169- 318/chap-5/ 

# Lawler, Matusky & Skelly Engineers LLP

## REFERENCES



# EA Science and Technology. 1989. 1987 

## annual report - entrainment abundance and 

# unit outage evaluation for Bowline Point Generating Station (Final). Report 

## prepared for Orange and Rockland Utilities 

# , Inc. April 1989. 

## Hutchison , J. 

# B. Jr. 

# , and J. 

# A. Matousek. 

# 1988. Evaluation of a barrier net used to 

## mitigate fish impingement at a Hudson River power plant intake. 

## Pages 200- 285. IN: Barnthouse , C. , R. 

### J. Klauda , D. 

### S. Vaughan and R. C. Kendall , eds. 

## American Fisheries 

# Society Monograph 4: Science , Law 

# , and Hudson River 

## Power Plants. Lawler 

## , Matusky & Skelly 

# Engineers (LMS). 1992. Bowline 

## Point fine mesh barrier 

## net evaluation study, progress report: June- September 1992. 

## Progress report 

## submitted to Orange and Rockland Utilities 

# , Inc. 7 October 1992. 

## Lawler 

## , Matusky & Skelly Engineers (LMS). 

# 1994. Effectiveness evaluation of a fine 

# mesh barrier net located at the cooling wa~er intake of the 

## Bowline Point Generating Station. Report prepared for 

## Orange and Rockland Utilities , Inc. April 1994. 

## Normandeau Associates. 1995. Bowline 

## Point Generating Station 1994 impingement

studies. Report prepared for 

## Orange and Rockland Utilities 

# , Inc. June 1995.

MB/I- IO-96 1:09pmIh2461S/169-31S/Refs 

## Lawler 

# , Matusky & Skelly Engineers LLP

## ATTACHMENT A WATER QUALITY INFORMATIONBOWLINE POINT GENERATING STATIONFine Mesh Barrier Net Evaluation Study - Water Quality Information - 1994TEMPERATUREDisaolved OxygenCONDUCTIVITYSAUNITYTRANSSTATION(degC)(mgII)(umhOll/cm!B!25 deg C)(wi)PARENCYLOCATIONDATETIMEDEPTH(em)1301Bowtlne Pond6/22J9415:2926.25.24.6 24.4100420044002.52.72.975.1302Bowtlne Pond Inlet6/22J9417:0025.25.24.7 24.3400330033002.02.02.150.1303Haveratraw Bay6/22/9417:1628.1304Bowtlne Pond6/24/9409:2830.24.5 24.24.3800400041002.42.52.766.1305Haverstraw Bay6/2419410:0229.1306Bowtlne Pond Inlet6/2419410:3024.24.24.24.3200328032002.02.02.064.1307Bowtine Pond6/2719410:0822.24.24.6 24.3620365039002.22.562.21308Bowtine Pond Inlet6/2719411:1724.25.25.6 25.3080332034502.01309Haverstraw Bay6/2719411:5524.25.25.6 25.3080332034502.52.01310Bowtlne Pond6/2919409:2830.25.25.24.3100320039502.02.445.1311Bowtine Pond Inlet6/2919410:0725.1312Haverstraw Bay6/2919410:4425.25.25.0 24.24002450252050.1313Bowtine Pond7/0119409:2520.25.25.24.21402190250076.1314Bowtlne Pond Inlet7/0119411:0223.1315Haverstraw Bay7/0119411:3625.25.26.0 24.1190127013101316Haverstraw Bay7/0619410:0930.1317Bowtlne Pond Inlet7/06/9410:2425.26.0 25.9 25.219023002350106.1318Bowtlne Pond7/0619412:3425.26.26.3 25.20902350250064.1319Haverstraw Bay7/0819408:1730.1320Bowtlne Pond Inlet7/0819408:4828.26.26.3 25.48005100620079.1321Bowtlne Pond7/08/9409:5036.27.26.9 26.3600369041102.32.891.1322Bowtlne as Unit 17/12/9408:5225.1323Barrier Net Outside/SOuth7/12/9413:4630.1324BarrIer Net Outside/North7/12/9414:0224.27.3 26.5 26.60006000600070.1325Barrier Net Inalde7/12/9414:4025.1326Bowtlne as Unit 17/1319408:2525.1327BarrIer Net Inalde7/13/9409:3923.1328Barrier Net Outalde/North7/1319409:5625.1329BarrIer Net Outalde/SOuth7/1319410:0927.0 26.5 26.60006000610062.01330Bowtlne Pond Inlet7/1319410:4327.1331Bowtlne as Unit 17/1319412:5730.1332Barrier Net OutsIde/North7/1319414:3525.1333BarrIer Net Outslde/South7/1319414:4930.28.27.27.56008100630063.1334Bowtlne as Unit 17/1319416:0736.1335Bowtine as Unit 17/1519408:5026.1336BarrIer Net Inalde7/1519410:1424.1337BarrIer Net Outside/North7/1519410:3123.1338BarrIer Net OutaIde/South7/1519411:1920.26.5 26.5 26.59005500560092.1339Bowtlne as Unit 17/15/9412:241340Barrier Net Outside/North7/1519413:3925.1341BarrIer Net OutsIde/SOuth7/1519413:5224.26.26.6 26.55005500550074.1342Bowtlne as Unit 17/1519414:371343Bowtlne as Unit 17/1819410:0530.1344BarrIer Net Inside7/1819411:0626.1345Barrier Net Outside/North7/1819411:2324.1346Barrier Net Outslde/South7/1819411:3928.27.27.5 27.7.44650498052002.077.1347Bowtlne as Unit 17/1819412:511348BarrIer Net Outslde/SOuth7/1819413:4924.BOWLINE POINT GENERATING STATIONFine Mesh Barrier Net Evaluation Study - Water Quality Information - 1994TEMPERATUREDIssolved OxygenCONDUCTIVITYSALINITYTRANSSTATION(dug C)(mg/I)(umhoslcm(S)25 dug C)(wi)PARENCYLOCATIONDATETIMEDEPTH1349BarrIer Net Outside/North7/18/9414:0126.27.27.27.4700478047202.92.974.1350Bowtlne OS Unit 17/18/9414:3824.1351Bowtlne OS Unit 17/20/9409:2728.1352BarrIer Net Inside7/20/9410:1228.1353BarrIer Net Outside/North7/20/9410:2426.1354BarrIer Net Outslde/South7/20/9410:3930.28.27.27.62006500580098.1355Bowtlne Pond Inlet7/20/9410:5227.1356Bowline OS Unit 17/20/9412:2525.1357BarrIer Net Outslde/South7/20/9413:2625.1358BarrIer Net Outside/North7/20/9413:3723.28.27.27.55005500580089.1359Bowtlne OS Unit 17/20/9415:1022.1360Bowtine OS Unit 17/22J9409:1128.1361Barrier Net Inside7/22J9410:0128.1362BarrIer Net Outside/North7/22J9410:1225.1363BarrIer Net Outside/South7/22J9410:2431.28.28.28.58006200650080.1364Bowtine OS Unit 17/22J9411:4828.1365BarrIer Net Outslde/South7/22J9412:3427.1366BarrIer Net Outside/North7/2219412:4529.28.28.59006100660082.01367Bowtlne OS Unit 17/22J9414:0525.1368Bowtine OS Unit 17/25/9409:2624.1369BarrIer Net Outside/North7/25/9410:2326.28.28.27.5000500053002.92.975.1370BarrIer Net OutsIde/South7/25/9410:3826.1371Bowtlne OS Unit 17/25/9411:4926.1372Barrier Net OutsIde/South7/25/9413:3828.1373BarrIer Net OutsIde/North7/25/9413:5225.29.29.28.4900510059002.72.979.1374BarrIer Net Inside7/25/9414:1426.1375Bowtlne OS Unit 17/25/9415:3125.1376Bowtlne OS Unit 17/27/9410:2635.1377BarrIer Net Outside/South7/27/9411:2224.28.28.27.4800490050002.62.82.968.1378BarrIer Net Outside/North7/27/9411:3524.1379Bowtlne Pond Inlet7/27/9411:5025.1380Bowtlne OS Unit 17/27/9412:4926.1381BarrIer Net OutsIde/South7/27/9414:4530.1382Barrier Net Outside/North7/27/9414:5826.29.29.27.4800495051002.977.01383BarrIer Net Inside7/27/9415:1928.1384Bowtlne OS Unit 17/27/9416:1434.1385Bowtlne OS Unit 17/29/9409:1123.1386BarrIer Net Inside7/29/9409:3123.1387BarrIer Net OutsIde/North7/29/9411:0824.1386Barrier Net OutsIde/South7/29/9411:2023.28.27.27.3680372039802.291.1389Bowtlne OS Unit 17/29/9411:2524.1390BarrIer Net Outslde/South7/29/9412:5529.1391Barrier Net OutsIde/North7/29/9413:0626.29.28.27.3800362040502.02.12.595.1392Bowtlne OS Unit 17/29/9413:5026.1393Bowtlne OS Unit 18/05/9411:0528.1394BarrIer Net Inside8/05/9412:0428.1395BarrIer Net Outslde/South8/0519412:1330.1396BarrIer Net Outside/North8/05/9412:2325.28.28.28.48805500560092.0

## ATTACHMENT B ICHTHYOPLANKTON COLLECTION INFORMATION FINE MESH BARRIER NET EV ALUA 

## TION PROGRAM 1994

## ATTACHMENT Bl ICHTHYOPLANKTON ABUNDANCE MONITORING PROGRAM ...

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## ----------- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

## --------- ------------

6/22/94 Bowl ine Pond 1301 

### 15:29 

### 246.

BAY ANCHOVY 

### 36. CLUPEIDAE 

### 32. STRIPED BASS 

### 28. UNIDENTIFIED 12. I4ORONE SPP. 

### . 6/22/94 Bowl ine Pond 

## Inlet 1302 

### 17:00 

### 226.

STRIPED BASS 924 

### 077. BAY ANCHOVY 123. WHITE PERCH 61. 79 I4ORONE SPP. 57. CLUPEIDAE 

### S/22/94 Haverstraw Bay 1303 

### 17:16 

### 225.

STRIPED BASS 115 

### 510. BAY ANCHOVY 288. I4ORONE SPP. 

### 57. WH I TE PERCH 

### 48. CLUPEIDAE 26. 

### 6/24/94 Bowl ine Pond 1304 

### 09:28 235.

CLUPEIDAE 16. STR I PED BASS 16. I4ORONE SPP. 12. BAY ANCHOVY WH I TE PERCH SILVERSIDES UNIDENTIFIED 

### 6/24/94 Bowl ine Pond 

## Inlet 1306 10:30 

### 238.

BAY ANCHOVY 

### 356. UNIDENTIFIED 184. STRIPED BASS 104. I4ORONE SPP. 

### 41. WHITE PERCH 16. CLUPEIDAE 12. CYPRINIDAE 

### ~/24/94 HBverstraw Bay 1305 

### 10:02 

### 251.4
STR I PED BASS 

### 75. BAY ANCHOVY 

### 43. UNIDENTIFIED 

### 31.

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'/24/94 Haverstraw Bay 1305 

### 10:02 251.
MORONE SPP. 27. CLUPEIDAE 15. WH ITE PERCH 11. 

### ~/27/94 Bowl ine Pond 1307 

### 10:08 197.

STRIPED BASS 25. BAY ANCHOVY 15. WH I TE PERCH 15. UNIDENTIFIED 

### 6/27194 Bowl ine Pond Inlet 1308 11: 17 

### 233.

BAY ANCHOVY 150. STRIPED BASS 38. UNIDENTIFIED 

### 30. WHITE PERCH 25. MORONE SPP. 

### 6/27/94 Haverstraw Bay 1309 11 :55 

### 270.

BAY ANCHOVY 18. UNIDENTIFIED MORONE SPP. 

### 6/29/94 Bowl ine Pond 1310 

### 09:28 231.3

BAY ANCHOVY 30. STRIPED BASS 17. WH I TE PERCH 

### 6/29/94 Bowl;ne Pond Inlet 1311 

### 10:07 223.

STRIPED BASS 170. BAY ANCHOVY 107. WH I TE PERCH 

### 31. UNIDENTIFIED CLUPE I DAE SILVERSIDES 

### 6/29/94 Haverstraw Bay 1312 

### 10:44 

### 217.

BAY ANCHOVY 419. STR I PED BASS 101.38 UNIDENTIFIED 23. WHITE PERCH 13. HORONE SPP.

### 1/10/96 B~LINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM ICHTHYOPLANKTON MONITORING PROGRAM Page

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## ----------- - - - - --- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 

## --------- ------------

6129/94 Haverstraw Bay 1312 

### 10:44 

### 211.



### 1/01/94 Bowl ine Pond 1313 

### 09:25 212.

BAY ANCHOVY 

### 1/01/94 Bowl ine pond Inlet 1314 11 :02 

### 204.

STRIPED BASS 

### 303. MORONE SPP. 58. \lH lYE PERCH 24. UNIDENTIFIED BAY ANCHOVY 

### 7/01/94 Haverstraw Bay 1315 11 :38 

### 219.

STRIPED BASS 150. MORONE SPP. 

### 50. UNIDENTI F I ED \lH I TE PERCH BAY ANCHOVY CLUPEIDAE 

### 7/06/94 Bowl ine Pond 1318 

### 12:34 208.

BAY ANCHOVY 

### 38.


### 1/06/94 Bowl ine Pond 

## Inlet 1317 

### 10:24 233.

BAY ANCHOVY 

### 34. HOGCHOKER 

### 1/06/94 Haverstraw Bay 1316 

### 10:09 239.

BAY ANCHOVY 

### 45. STRIPED BASS 16. UNIDENTIFIED 

### 7/08/94 Bowl ine Pond 1321 

### 09:50 251.

BAY ANCHOVY 

### 386. HOGCHOKER 139. UNIDENTIFIED 15.


### 7/08/94 Bowl ine Pond 

## Inlet 1320 

### 08:48 251.

BAY ANCHOVY 266 

### 031.90 HOGCHOKER 

### 42.- /10/96 BOWLINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM ICHTHYOPLAN~TON MONITORING PROGRAM Page

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## ----------- - - - - -- - - - - - - - - - - - - -- - - - - - - - - - - - - - - - - 

## --------- 

## ------------

7/08/94 Bowl ine Pond Inlet 1320 

### 08:48 257.
UNIDENTIFIED STRI PED BASS 

### /08/94 Haverstraw Bay 1319 

### 08:17 272.

BAY ANCHOVY HOGCHOICER SILVERSIDES 

### /13/94 Bowl ine Pond 

## Inlet 1330 

### 10:43 272.

BAY ANCHOVY 741 HOGCHOICER UNIDENTIFIED 

### 7/20/94 Bowl ine Pond Inlet 1355 

### 10:52 

### 253.

BAY ANCHOVY 139 HOGCHOICER 

### /27/94 Bowl ine Pond Inlet 1379 11 :50 

### 274.

BAY ANCHOVY

## ATTACHMENT B2 FINE MESH BARRIER NET EV ALVA 

## TION PROGRAM

### /11/96 BOJLlNE POINT FINE MESH BARRIER NET EVALUATION PROGRAM ICHTHYOPLAN~TON MONITORING PROGRAM Page

VOLUME INVENTORY START SAMPLD NO. CONC. LOCATION NUMBER TIME COMMON NAME COLLECTED (#/1000 . 

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## ---------

-------_u-- 7/12/94 Bowl ine GS Unit 1 1322 

### 08:52 

### 34.

BAY ANCHOVY 106 

### 111.37 HOGCHOKER 264. 

### (13/94 Bowl ine GS Unit 1 1326 

### 08:25 

### 34.

BAY ANCHOVY 937. UNIDENTIFIED 146. HOGCHOKER 146. 

### 7/13/94 Bowl ine GS Unit 1 1331 

### 12:57 34.

BAY ANCHOVY 111 258. HOGCHOKER 117. 

### '13/94 Bowl ine GS Uni t 1 1334 

### 16:07 

### 34.

BAY ANCHOVY 117. UNIDENTIFIED 58. HOGCHOKER 29. 

### 7/15/94 Bowl ine GS Unit 1 1335 

### 08:50 34.

BAY ANCHOVY 350. HOGCHOKER 117. UNIDENTIFIED 88. GOBIIDAE 

### 1/15/94 Bowl ine GS Unit 1 1339 

### 12:24 

### 34.

BAY ANCHOVY 144. HOGCHOKER 88. UNIDENTIFIED 58. 

### /15/94 Bowl ine GS Unit 1 1342 

### 14:37 

### 34.

BAY ANCHOVY 763. UNIDENTIFIED 58. HOGCHO~ER 58. 

### 7/18/94 Bowl ine GS Unit 1 1343 

### 10:05 

### 34.

BAY ANCHOVY 675. UN I DENTI F I ED 205. 

### /18/94 Bowl ine GS Uni t 1 1347 12 :51 

### 34.

BAY ANCHOVY 205. UNIDENTIFIED 58. HOGCHOKER 58. 

### :/18/94 Bowl ine GS Unit 1 1350 

### 14:38 

### 34.

BAY ANCHOVY 146.

### '11/96 B~LINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM ICHTHYOPLANKTON MONITORING PROGRAM Page

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LOCATION NUMBER TIME CCM4ON NAME COLLECTED ('/1000 

## ----- ---- - 

## -------- - --- - --- - 

## ----- 

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## --------- ------------

/18/94 Bowl ine GS Uni t 1 1350 

### 14:38 

### 34.
UNIDENTIFIED 

### 29.


### 20/94 Bowl ine GS Unit 1 1351 

### 09:27 34.

BAY ANCHOVY 117.
HOGCHOICER 

### 58. GOBIIDAE 

### 58. 

### :20/94 Bowline GS Unit 1 1356 

### 12:25 

### 34.

BAY ANCHOVY 

### 58. HOGCHOKER 29. 

### /20/94 Bowl ine GS Unit 1 1359 15: 10 

### 34.

BAY ANCHOVY 29.


### /22/94 Bowl ine GS Uni t 1 1360 09: 1 1 

### 34.

BAY ANCHOVY 

### 440. 

### 7/22/94 Bowline GS Unit 1 1364 11 :48 

### 34.

BAY ANCHOVY 264. 17 HOGCHOKER 

### 29. r 122/94 Bowline GS Unit 1 1367 

### 14:05 

### 34.

BAY ANCHOVY 

### 88. UNIDENTIFIED 

### 29.


### 25/94 Bowl ine GS Unit 1 1368 

### 09:26 

### 34.

BAY ANCHOVY 

### 205. 

### '25/94 Bowl ine GS Unit 1 1371 11 :49 

### 34.

BAY ANCHOVY 

### 410. HOGCHOKER 

### 29. 

### /25/94 Bowline GS Unit 1 1375 15 :31 

### 34.

BAY ANCHOVY 

### 58.
7/27194 Bowl ine GS Unit 1 1376 

### 10:26 

### 34.

BAY ANCHOVY 

### 58. 1/27194 Bowl ine GS Unit 1 1380 

### 12:49 

### 34.

BAY ANCHOVY 117. 

### (27194 Bowl ine GS Unit 1 1384 16: 14 

### 34.
UNIDENTIFIED 

### 58.

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7/27/94 Bowline GS Unit 1 1384 16: 14 

### 34.

1/29/94 Bowl ine GS Uni t 1 1385 09: 11 

### 34.

STRIPED BASS 

### 58. BAY ANCHOVY 29. 

### 7/29/94 Bowline GS Unit 1 1389 11 :25 

### 34.

BAY ANCHOVY 88. 

### 7/29/94 Bowl ine GS Uni t 1 1392 

### 13:50 

### 34.

BAY ANCHOVY 29. UN I DENTI F I ED 29. 

### i/05/94 Bowline GS Unit 1 1393 11 :05 

### 34.

BAY ANCHOVY 234. UNIDENTIFIED 29.

### /11/96 

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## --------- ------------

7/12/94 Barrier Net Inside 1325 

### 14:40 

### 30.

BAY ANCHOVY 

### 974. HOGCHOKER 

### 582. 

### /12/94 Berrier Net OUtside/North 1324 

### 14:02 

### 54.

BAY ANCHOVY 152 

### 774. HOGCHOKER 

### 474.


### 7/12/94 Barrier Net OUtside/South 1323 

### 13:46 

### 55.

BAY ANCHOVY 

### 231.03 HOGCHOKER 144. 

### /13/94 Barrier Net Inside 1327 

### 09:39 28.

HOGCHOKER 175. BAY ANCHOVY 105.


### 7/13/94 Barrier Net OUtside/North 1328 

### 09:56 56.

BAY ANCHOVY 880. HOGCHOKER 123. 

### 7/13/94 Barrier Net OUtside/North 1332 

### 14:35 

### 44.

BAY ANCHOVY 852. HOGCHOKER 

### 89. 

### /13/94 Barrier Net OUtside/South 1329 

### 10:09 

### 50.

BAY ANCHOVY 

### 318. HOGCHOKER 19. 

### 7113/94 Barrier Net OUtside/South 1333 

### 14:49 

### 50.

BAY ANCHOVY 

### 416. HOGCHOKER 177 . UNIDENTIFIED 

### 39.
'115/94 Barrier Net Inside 1336 10: 14 

### 27.

BAY ANCHOVY 

### 36. HOGCHOKER 

### 36. 

### 7l15/94 Barrier Net OUtsidelNorth 1337 

### 10:31 

### 54.

BAY ANCHOVY 292. UNIDENTIFIED 

### 54. HOGCHOKER 18.

### i/11/96 

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## ---------

---------_u '/15/94 

### Barri er Net Outside/North 1340 

### 13:39 

### 52.

BAY ANCHOVY 

### 420. HOGCHOKER 

### 95. SI LVERSIDES 

### 38. 

### (/15/94 Barr i er Net Outs ide/South 1338 

### 11:19 

### 49.

BAY ANCHOVY 

### 61.23 "/15/94 Barrier Net OUtside/South 1341 

### 13:52 

### 54.

BAY ANCHOVY 

### 406. HOGCHOKER 

### 73. UNIDENTIFIED 

### 36.


### /18/94 Barrier Net Inside 1344 11 :06 

### 23.

HOGCHOKER 

### 43.


### /18/94 Barrier Net Outside/North 1345 

### 11:23 

### 49.

HOGCHOKER 

### 60. BAY ANCHOVY 

### 20. 

### 7/18/94 Barrier Net OUtside/North 1349 14:01 

### 49.

BAY ANCHOVY 100. HOGCHOKER 

### 20.


### '/18/94 Barrier Net Outside/South 1346 11 :39 

### 45.

HOGCHOKER 

### 87. BAY ANCHOVY 

### 43. 

### /18/94 Barrier Net Outside/South 1348 

### 13:49 

### 51.

BAY ANCHOVY 78. HOGCHOKER 58.


### 7/20/94 Barrier Net Inside 1352 10: 12 

### 32.

BAY ANCHOVY 

### 61.42


### /20/94 Barrier Net Outside/North 1353 

### 10:24 

### 56.

BAY ANCHOVY 

### 335. ATLANTIC SILVERSIDE 17. 

### /20/94 Barrier Net Outside/North 1358 

### 13:37 

### 49.

BAY ANCHOVY 182. HOGCHOKER 20.

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## ---------



## ..-------_u 7/20/94 Barr i er Net Outs ide/North 1358 

### 13:37 

### 49.



### 7/20/94 Barrier Net Outside/South 1354 

### 10:39 

### 49.

BAY ANCHOVY 

### 560.
HOGC H OKE R 

### 20. 

### 7/20/94 Barrier Net Outside/South 1357 

### 13:26 

### 48.

BAY ANCHOVY 270. HOGCHOKER 

### 41. 

### 7/22/94 Barrier Net Inside 1361 10:01 

### 25.

BAY ANCHOVY 

### 39. 

### 7/22/94 Barrier Net Outside/North 1362 10: 12 

### 53.

BAY ANCHOVY 

### 37. HOGCHOKER 18. 

### 7/22/94 Barrier Net OUtside/North 1366 

### 12:45 

### 52.

BAY ANCHOVY 76. UNIDENTI FlED 19. 

### 7/22/94 Barrier Net OUtside/South 1363 

### 10:24 

### 48.

BAY ANCHOVY 123. 

### 7/22/94 Barrier Net OUtside/South 1365 

### 12:34 

### 53.

BAY ANCHOVY 

### 55. HOGCHOKER 18. 

### 7/25/94 Barrier Net Inside 1374 14: 14 

### 24.

NO CATCH 

### 7/25/94 Barrier Net OUtsidelNorth 1369 

### 10:23 

### 56.

BAY ANCHOVY 70. HOGCHOKER 

### 35. ATLANTIC SILVERSIDE 

### 35. 

### 7125/94 

### Barr i er Net OUts ide/North 1373 

### 13:52 

### 51.9

BAY ANCHOVY 

### 57. 

### 7/25/94 Barrier Net Outside/South 1370 

### 10:38 

### 56.

BAY ANCHOVY 

### 35.

### 1/11/96 BOWLINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM ICHTHYOPLANKTON MONITORING PROGRAM Page

VOLUME INVENTORY START SAMP LD NO. CONt.

ATE LOCATION NUMBER TIME (11 CCM4ON NAME COLLECTED ('/1000 11 

## ------------ - - - - -------- --- 

## ----------- - - - - - -- - - - - - - - - - - -- - - - - - - - - - - - - - - - - 

## --------- ------------

7125/94 Barrier Net OUtside/South 1372 

### 13:38 

### 60.

BAY ANCHOVY 

### 49.

7127/94 Barrier Net Inside 1383 

### 15:19 25.

BAY ANCHOVY 

### 39.

7127194 Barrier Net OUtside/North 1378 11 :35 

### 54.

BAY ANCHOVY 

### 37. 7127/94 

### Barr i er Net OUts ide/North 13g2 

### 14:58 

### 55.

BAY ANCHOVY 

### 36.


### 7/27/94 Barrier Net Outside/South 1377 11 :22 

### 52.

BAY ANCHOVY 

### 95. 

### 7127/94 Barrier Net OUtside/South 1381 

### 14:45 

### 53.

NO CATCH 

### 7/29/94 

### Barri er Net Ins ide 1386 09:31 

### 28.

NO CATCH


### 7129/94 Barrier Net OUtside/North 1387 

### 11:08 

### 49.

BAY ANCHOVY 

### 40. 

### 7/29/94 Barrier Net Outside/North 1391 

### 13:06 

### 50.

BAY ANCHOVY 

### 79.


### 7/29/94 Barrier Net OUtside/South 1388 11 :20 

### 58.

HOGCHOKER 

### 34.
BAY ANCHOVY 17. 

### 7/29/94 Barrier Net Outside/South 1390 

### 12:55 

### 52.

BAY ANCHOVY 19.


### 8/05/94 Barrier Net Inside 1394 

### 12:04 

### 33.

NO CATCH 

### 8/05/94 Barrier Net OUtside/North 1396 

### 12:23 

### 53.

NO CATCH

### 1/11/96 

## ~LINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM ICHTHYOPLANKTON MONITORING PROGRAM

INVENTORY START lATE LOCATION NlJ4BER TIME 

## .------- - - - - - - -- - - - - - - - - - -- 

### -- -- -- - - 

## -----------

8/05/94 Barrier Net Outside/South 1395 

### 12:13 VOLlJ4E SAMP LD (11 W4MON NAME

- -- - - -- - - - -- -- - - -- - - - - - - -- - - - - - - - - --



### 52.

NO CATCH NO. COLLECTED Page

CONC. ('/1000 . 

# --------- ------------

## ATTACHMENT C LENGTH FREQUENCY INFORMATION BY LOCATION AND DATEBO'JLlNE POINT FINE MESH BARR I ER NET EVALUA T I ON PROGRAM
Bowl ine Pond Inlet LENGTH FREQUENCY ANAL YSI S

BA Y ANCHOVY 

# S~le Date 

### Length (11m) 

### 6/24/94 7/01/94 7/08/94 7113/94 

### 7120/94 

### 7/27/94 

## --------------- -------- -------- -------- -------- -------- --------

0(1.5 

### 1.5 - 

### 0 - 

### 5 - 0 - 

### 5 - 0 - 5 - 0 - 

### 5 - 0 - 5 - 

### 0 - 5 - 0 - 5 - 

### 0 - 5 - 10. 

### 10. 

### 0 - 10. 10. 

### 5 - 11.0 11. 

### 0 - 11.5 

### 11.5 - 12. 

### 12. 

### 0 - 12. 12. 

### 5 - 13. 13. 

### 0 - 13. 13. 

### 5 - 14. 14. 

### 0 - 14. 14. 

### 5 - 15. 15. 

### 0 - 15. 15. 

### 5 - 16. 16. 

### 0 - 16. 16. 

### 5 - 17. 

### 17. 

### 0 - 17. 17. 

### 5 - 18. 

### 18. 

### 0 - 18. 18. 

### 5 - 19. 19. 

### 0 - 19. 

### 19. 

### 5 - 20. 

### 20. 

### 0 - 20.
Min Max 16. 

### 20. 18. 16. 13. 

### 11.5 Avg 13. 

### 10.

100 100 . "BOYLINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM Barrier Net Outside/North LENGTH FREQUENCY ANAL YS I S

BA Y ANCHOVY 

# s~le Date 

### Length (11m) 

### 7112/94 7113/94 

### 7/15/94 7/18/94 7/20/94 7/22/94 

### 7/25/94 

### 7/27/94 

### 7/29/94 

## --------------- -------- -------- -------- -------- -------- -------- -------- -------- --------

0(1. 

### 1.5 - 

### 0 - 

### 5 - 0 - 5 - 1.. 1.. 1.. 

### 0 - 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 

### 5 - 10. 10. 

### 0 - 10. 10. 

### 5 - 11.0 

### 11.0 - 11.5 

### 11.5 - 12. 12. 

### 0 - 12. 12. 

### 5 - 13.
Min Max 12. 10. 10. 12. 

### 11.6 11.1. Avg ...BO~LINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM Barr i er Net Outs ide/South LENGTH FREQUENCY ANAL YS I S

BAY ANCHOVY
SarlfJle Date Length (nm) 

### 7/12/94 7/13/94 7/15/94 7/18/94 

### 7/20/94 7/22/94 7125/94 

### 7/27/94 

### 7/29/94 

## --------------- -------- -------- -------- -------- -------- -------- -------- -------- --------

0(1. 

### 1.5 - 

### 0 - 5 - 0 - 5 - 0 - 5 - 0 - 5 - 0 - 5 - 0 - 

### 5 - 0 - 5 - 0 - 5 - 10. 10. 

### 0 - 10. 10. 

### 5 - 11.0 11. 

### 0 - 11.5 

## 11.5. 12. 12. 

### 0 - 12. 12. 

### 5 - 13. 13. 

### 0 - 13. 13. 

### 5 - 14. 14. 

### 0 - 14. 14. 

### 5 - 15.
Min Max 

### 12. 

### 11.5 11.6 13. 12. 12. 14. AvgBO\.Il1NE POINT FINE MESH BARR I ER NET EVALUA T ION PROGRAM

Bowl ;ne Pond Inlet LENGTH FREQUENCY ANAL YSI S

BA Y ANCHOVY

Sa~le Date 

### Length (rnn) 

### 6/24/94 7/01/94 7/08/94 

### 7/13/94 7/20/94 7/27/94 

## --------------- -------- -------- -------- -------- -------- --------



### .:1.5 

### 5 - 0 - 

### 5 - 0 - 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 5 - 10. 

### 10. 

### 0 - 10. 10. 

### 5 - 11. 

### 11. 11. 

### 11.5 - 12. 

### 12. 

### 0 - 12. 12. 

### 5 - 13. 13. 

### 0 - 13. 13. 

### 5 - 14. 14. 

### 0 - 14. 14. 

### 5 - 15. 

### 15. 

### 0 - 15. 15. 

### 5 - 16. 16. 

### 0 - 16. 

### 16. 

### 5 - 17. 17. 

### 0 - 17. 17. 

### 5 - 18. 

### 18. 

### 0 - 18. 18. 

### 5 - 19. 

### 19. 

### 0 - 19. 19. 

### 5 - 20. 

### 20. 

### 0 - 20. M;n Max 

### 16. 

### 20. 18. 16. 13. 

### 11.5 Avg 13. 10.

100 100BO\JLlNE POINT FINE MESH BARRIER NET EVALUATION PROGRAM
Bowline GS Unit 1 LENGT H FREQUENCY ANAL YS IS

BA Y ANCHOVY 

# S~le Date 

### Length (11m) 

### 7/12/94 7/13/94 7115/94 

### 7/18/94 7120/94 

### 7/22/94 

### 7/25/94 7127194 

### 7129/94 

### 8/05/94 

## --------------- -------- -------- -------- -------- -------- -------- -------- -------- -------- --------

.:1. 

### 5 - 0 - 0 -


### 5 - 5 - 0 - 5 - 5 - 0 - 

### 5 - 10. 

### 10. 10. 

### 10. 

### 5 - 11. 11 . 

### 0 - 11.5 

### 11.5 - 12. 

### 12. 

### 0 - 12. 

### 12. 

### 5 - 13. 

### 13. 

### 0 - 13. 

### 13. 14. 

### 14. 

### 0 - 14. 14. 15. 15. 

### 0 - 15. 15. 

### 5 - 16. 16. 

### 0 - 16. 

### 16. 17.
Min Max 

### 12. 12. 15. 12. 13. 13. 

### 15. 12. 16. 14. Avg 10. 11. 11.Barrier Net Inside LENGTH FREQUENCY ANAL YS I S

BA Y ANCHOVY BOYLINE POINT FINE MESH BARRIER NET EVALUATION PROGRAM



### Length (II1II) -----.--------- -------- -------- -------- -------- --------

Sall'pl e Date 

## 7/12/94 7/13/94 7/15/94 

## 7/20/94 7/27194
-:1. 

### 1.5 - 

### 0 - 5 - 

### 0 - 5 - 0 - 

### 5 - 0 - 

### 5 - 0 - 5 - 

### 0 - 0 - 

### 5 - 5 - 10. 10. 10.
Min Max 10. Avg

## ATTACHMENTD FINE MESH BARRIER NET EV ALUA 

## TION PROGRAM BAY ANCHOVY BODY LENGTH - BODY DEPTH MEASUREMENTS 1994B8y erd't:Nf. body IengIh - body dep1h relaUonsHp

BoMne Point Fme Mesh BarTler Net EVIW81ion Progam: 1994
LENGTH DEPTH LENGTH DEPTH LENGTH DEPTH LENGTH DEPTH LENGTH DEPTH LENGTH DEPTH
11. 10. 10. 10. 11. 10.

11. 12. 10.
12. 14. 10.
11. 10. 11. 1.2 11.

12. 11. 11. 16.

10. 11. 11. 14. 11. 10. 13. 16. 12. 14. 10. 11. 13. 16. 11. 10. 10. 10. 12. 10. 10. 10.
11. 10. 12. 10. 10. 11. 11. 11. 13. 11. 10. 12. 11.4 15. 1.6 13. 12. 11.
11.

10. 10. 12. 12. 10. 10. 11. 10. 12. 12. 10.

10. 10. 12. 11. 12. 10. 13. 11. 12. 11. 10. 13. 11. 12. 11. 10. 12. 10. 10. 11. 13. 10. 13. 11. 13. 13. 11. 12. 13. 10. 11. 12. 1.2 11. 11. 10.4 11.