ML20149F075

Intervenor Exhibit I-COMM-6,consisting of from Util to G Derman of Avis Airmap Re Analysis of Aerial Photographs Flown on 870718

ML20149F075
Person / Time
Site:	Seabrook
Issue date:	11/18/1987
From:	Macdonald J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Derman G AVIS AIRMAP
References
OL-I-COMM-006, OL-I-COMM-6, NUDOCS 8802110408
Download: ML20149F075 (4)

Text

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August 12, 1987 Gordon Derman Avis Airmap 454 Washington Street Braintree, MA 02184 Dear Gordon.

Thank you for your presentation to our staff last Thursday. Your ideas and pro-posed methodology were well received and appear to be sufficient to complete our study of the New Hampshire beach area. Your firm's ability to complete the task within our stringent schedule, as well as your qualifications and those of your staff have resulted in New Hampshire Yankee's awarding Avis the job.

The analysis of the aerial photographs that were flown on July 18, 1987 is to be performed by your firm Avis Airmap of Braintree, Massachusetts. Phase 1 of the analysis is to include the "Priority 1" photos and is to be completed by August 28 vith interim data available throughout the process.

Enlargements from the contact prints at an enlargement ratio of 12.5x will be used as the base "map" for the study and printed on photographic paper 30" x 50". In order to replicate previous analyses in which vehicle counts were obtained and aggregated by town beach (Seabrook) and smaller beaches (Wallis Sands), town boundaries will be inked on to the photo enlargements. Treated acetate will be used to overlay all of the photographic enlargements. The actual physical recording of all vehicle and people counts will be marked directly un the acetate overlays using different colors for each category of vehicles, and for each category of population.

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• Seobrcok. NH 03874 . Telephone (603)474-9521 J

The following methodology is to be implesented during the study to ensure thorough accounting of people and vehicles in the beach area.

The area to be counted within the "Priority 1" set of photos extends con-tinuously along the New Hampshire coast from Route 286 on the south, to Odiornes

- Point on the north, including but not limited to:

Seabrook Beach Hampton Beach North of NH 51, including North Beach Plalce Cove, Little Boars Head, Bass Beach, North Hampton Beach Rye and Jenness Beaches and Straw Point Wallis Sands, Odiornes Point This area extends from the shoreline, west to the marsh boundary, or west for a distance of one-half mile where from the shoreline there is development in the absence of the marsh.

People People on tne beach (on the send and in the water), and on the boardwalks will be counted. We have defined the following category of people:

o people on the beach (sand and water) o people occupying both sidewalks and parking lots abutting Route 1A or the beaches

. A grid pattern with uniform grid spacing which forms sampling sub-areas will be drawn on an overlay to be positioned over each photo enlargement, This post-tioning will be defined so that if the overlay is detached from the photo, it will be able to be repositioned exactly as when the data was recorded, To ensure consistency and accuracy, a stereoscope will be utilized to review the densely populated beach areas before any counting is done on the acetate overlays. A permanent ink marking pen will be used to draw a set of continuous 2 _

O O lines, within each sub-area: each line will connect persons within that sub-

. area. These lines will be drawn systematically from (left to right)/(top to botton) and the count of persons covered by each line will be tallied on data sheets. The number of these connecting lines in each sub-area will vary according to the density of persons within the sub-area. Each sub-area will have an identifying number, keyed to the individual photo enlargement The method of continuous lines that you have recommended has been selected, as it ensures that all "outlier" persons who have not been counted will be obvious during visual inspection, and therefore not excluded in the final count. A count of persons will be tabulated for each sub-area. then summed over all sub-areas on each photo enlargement, stratified by category.

Vehicles Vehicular counts will also be performed using separate acetate overlays from those used to count people. Four categories of vehicles / vehicle space will be counted and include:

- filled parking spaces (i.e. parked vehicles) # )

- unfilled delineated parking spaces #

- unfilled non-delineated parking spaces *(1.e. no pavement marking)

- vehicles in transit on the roadways A separate color marker will be used to indicate each of the four vehicle cate-gories (on the same acetate overlay), and a line will be drawn over each vehicle directly on the overlay. A grid pattern form _ng sub-areas will be used to count vehicles. The grid lines forming the boundaries of each sub-area will be drawn down the middle of selected streets. These sub-areas should contain no more than 500 cars approximately. Each sub-area will enclose a more-or-less uniform land use, e.g., residential, parking lots, beach front, motels, etc. A count of vehicles, stratified by category, will be tabulated for each sub-area, then summed over all sub-areas on each photo enlargerent.

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Deliverables The deliverables from the an& lysis by Avis will be as follows:

o all acetate overlays, properly keyed to the photo enlargements, with the color-coded markings thereon o all informal interim data forms, tabulations, etc o interim data reports on a town by town basis The deliverables from the previous purchase order are as follows:

o all photo enlargements (Priorities 1 and 2) with the time of the photo-graph noted on the back of 6ach print c 3, .r o all endd' ite contact prints o an index map Congratulations on receipt of the job. We look forward to working with you and 3

completing our anaiysis of tne parking and population study of the beach areas ir. New Hampshire. Please p,* ovide us with a copy of your fee schedule and cost estimate for this additional scope of work at your earliest convenience.

Yours Sincerely, tTb '

//

v' James A. MacDonald cc: T. Harpster G. Hill P. Frechette J. Hart G. Willant K. Larson E. L !eberman C. Cessinger S. Peck L. Tilston A. Callendrello

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