Prepared in cooperation with the Water Conference Manhasset-Lakeville Water District Nassau County Department of Public Works Nassau Suffolk Water Commissioners Association City Department of Environmental Protection New York State Department of Environmental Conservation U.S. Department of the Interior Port Washington Water District Sands Point Water Department Scientific Investigations Map 3326 U.S. Geological Survey Suffolk County Department of Health Services Suffolk County Water Authority Potentiometric surface in the Magothy and Jameco aquifers—SHEET 2 of 4 Towns of North Hempstead and Shelter Island Water Authority of Great Neck North Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifers of Long Island, New York, April–May 2013

-74° -73°30' -73° NEW HAVEN COUNTY -72°30' -72° SUFFOLK COUNTY

CONNECTICUT NEW YORK 84.0 54.0 USGS 404818073293101 N 114541 USGS 404932073055902 S 33380

82.0 52.0 NO DATA d WESTCHESTER in R Ma 80.0 50.0 C COUNTY O N N E N W E C ORIENT Y T O IC HARBOR R U 78.0 K T 48.0 T CONNECTICU LON RK G NEW YO I BLOCK ISLAND SLA M TY EXPLANATION N a EXPLANATION D COUN D i EL 76.0 FAIRFI 46.0 S n 41°10' NTY O U COU Daily mean altitude (NGVD 1929) U S Daily mean altitude (NGVD 1929) NASSA N D t

Daily altitude (NGVD 29), in feet Water level shown on map (NGVD 1929) Water level shown on map (NGVD 1929) NEW YORK Daily altitude (NGVD 29), in feet SOUND CONNECTICUT 74.0 D 44.0 N S N U U A F F Oct. 2012 Feb. 2013 Apr. 2013May 2013 July 2013 Oct. 2012 Feb. 2013 Apr. 2013May 2013 S Nov. 2012 Dec. 2012 Jan. 2013 Mar. 2013 June 2013 Aug. 2013 Nov. 2012 Dec. 2012 Jan. 2013 Mar. 2013 June 2013July 2013Aug. 2013 O Sept. 2013 40°50' O S Sept. 2013 L A S K U

C GARDINERS

TY C O O Date N U Date U O U C N R N Y D T TE T BAY W ES UN T Y E H O N Y ST TC C CH ES AU A BR ES W SS O TE NA L N R X C CO S OU UN I NT TY SOUTHOLD Y

BAY F

e

r r

G y

d

R R

N n d i O Ma L HUNTINGTON OYSTER NORTHPORT COLD BAY BAY BAY SPRING HARBOR HARBOR SMITHTOWN SHELTER ISLAND SOUND S 81831 HOG d 20 NECK BAY 22.17 R P y BAY ort tr M S 64023 W d BRONX COUNTY as n a Long Island h u i R ing o n to C y n S 25.13 r t r B th 30

l r e

v F o So ?

d und Ave

N h

Y t

T HEMPSTEAD u N o

U TY NOYACK NORTHWEST O HARBOR S C UN S 57980 LITTLE NAPEAGUE X O HARBOR N C BAY O U n Blvd d Ave R A rther 20 39.45 oun CUTCHOGUE PECONIC BAY B S No S AS und Avenue HARBOR N So BAY 40 S 122477 THREE

R S 71576

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N 2528 o t

N 12522 S 120188 y HARBOR S e

BAY n 8.56

s P 10 d P u n

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n c o r

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B s k n

70.81 k i

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15.96 l 35.82 n e r w S 15622 a

VER S 23998 r N a R o R I t

R n 40 o M

Blvd o t H

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ern N c a a rth N o o M r d

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a k

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NS COUNTY d

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o

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60.85 t S h

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NEW JERSEY lvd o w

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er p t o f S 117758 d s

N 12152 h e s f R a

t O e r e g

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NEW YORK k J o r

k

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t t 56.91 C e r 12.04 e S 105711 o w o n e r

R N 3475 S 117439 l r

r P d T y

S 122348 - D d y d R p B t i se M r k FLUSHING w d

RIVER COUNTY Y LITTLE a S 19057 con S 82939 GREAT 11.27 e Montauk Hwy

T p 77.06 y 27.57 es t

20 0 20 MILES x 49.13 50 N BAY R N S

G E C NECK 40 U Y r 20 d 57.30 a y n 3.61 10 O T n r W i d kw e o C N C al P n BAY S 70488 es a K U entr o s k t Y t s Jericho Tp e ntry Rd M M Y R O s u a t PECONIC T C e 70 Co in St s T O it I N 1155 60 le a N Y S h s N 11732 Midd 56.81 E S 59992 N l U N a U W E W S 53360 30 O E n ericho Tpke S 74585 S 89534 O E N 7554 70.01 J V C N U d 60.81 e 20 Montauk Hwy C t FLANDERS 5.39 Q N e 20 0 20 KILOMETERS N o 70 r P BAY K rt N 11454 a 49.76 try Rd hern 71.64 n d Coun Y 24.02 O Blvd iddle R C k 35.54 orthern s M a BAY V N S S 76673 R

S w ta M p

l I O U g sla t a e n n e e e u

D Y o d E m h N gent Dr t y L x g

n 80.00

a p P a U o w NASSAU o u

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p r 61.77 ia a H W W w T v l k y i

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N l y u k r P No A B

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r p e 41° k H

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w COUNTY S 95965 n d

E y 38.38 a S 59793 w

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E P 80 e M 80 th S d y n or tate

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COUNTY s i

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Q p d t p F

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a n Q d 10.86 e w

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B y x E A a

l v E S 74284 i

SUFFOLK COUNTY g

E U I L d P 70 l o d s N l n 45.06 u R n C i

l a S k l a e

N g Is O S 45638 d iv w S 60123 g I on C U n R e s R L y 72.99 W O l O d r a N d a h y n w U y ke e d e Montauk S a d k T N 11659 npi 69.15 rh a sw W P N Y Tur S 22577 ve d 7.50 D s Exp l T richo S 38491 Ri - H re wy o a Y 60 Je P - am U r S o

p 52.46 N p x o t rt es to E U J n d H n N 845 A 42.26 y e h B S 77436

s e F f c

h e 39.43 R w f i a n k S y p e r y

C p F x s

a W S w r e T sland Exp d E s o S ng I 40°40' e v d ion O Lo d on R n n e n S 109074 e U a A S 120717 la M d u a 71.13 L s - 8.66

n r a S 33380 I W K Q n U g 10 Y G W n e

t f o Y B S s

QUEENS L - 50 o 50

E a C t

T l C h Lon H 21.98 S a g v r 41.47 g I

O s

N n O e land E a

R d d xpwy 49.63 K g m

Y y h S 24773 U e

E R U l Ave U

e p

T sid t Long Island Hwy ill l Expw e

J O k H - 70 y is N t

i e

O S N S 43641 o r N k n Y C o r u

O n 10

T S

t T U COUNTYe o W o k R

K p a 45.74 R

T Y

Y E O y r on s W R Uni M d d

C t s N E 42.48

O B e t S N Y S e y

e k e w Tp t H P

G ho D k

a Jeric a au W r nt

e MECOX

N M k o F y rt t

E I le Ave 40 d S 47453 M The general configuration of the potentiometric surface in the Magothy aquifer is similar l B e e N w K a ve N 3934 o

A r Q 1812 t

de a BAY b i w H P y lls N 7650 y w i P F H u H b

r i y ise o a r s r ok c a 43.78 n

S u

M a t E S h 53.19 a k r

B yr 26.16 30 te r S 30230 (Hill St) to that of the water table, rising gradually from the western part of Long Island to form an

n k

r t s k P x

A o le C

A 45.99 O

k v

v a k w v p A d e r i

e l w

l l

i w o S 122349 Q 2300 l w v d n

a n e a Ve 11.29 u Y y e d

s t

y

e R

T y S 94489 y r e N 7493 A R an R east-west-trending mound in Nassau and western Suffolk Counties. The surface of the mound

N V s s M i

v d d k U e v a 37.47 m

O C n 32.05 I o e

C Y ca Ave 20 ria R S 84806 e T i s

Jama n l a a H r L

S N N 11396 w d h 14.87

l 60

N U 36.48 S 76016 h e r y KINGS a r

E O W p

l

E o e w TIANA C e a then gradually declines toward the eastern end of Long Island. In areas where deep channels

U n f S Y 23.76 a i

Q M t 40

G y d d s N 54.27 o - d

I e 42.63 e

c R BAY

r n

K S R P Hem e k r p d s

M u

t m A UPPER i e d

COUNTY k a P c d have been eroded into the Magothy aquifer and filled with glacial deposits, the potentiometric-

E T g v w

r pk i k o

o e S 66138 t E e a x

st L S 67074 h

N s er i Hemp h n y stea EW NEW YORK n P p B d Tp p a d Q 2443 ke t JE r e c RS y e kw n d o EY c ay R w l Blv t o v w NE w t c N 11168 42.94 a surface contours were drawn from water levels measured in wells screened in these upper

W p k y d 38.07 A a N P YO 50 n

RK BAY x v 10 wa 25.98 N 11577

E N BAY

y e

s e B A l w v e

u d 33.49 v M

w e

an 26.51 b Sunrise on glacial aquifer deposits, which are laterally contiguous and hydraulically connected to the r

Hwy t Y a SHINNECOCK

w Q 3589 i outhern Sta

d S t u

o o e Pkw k

g

G Q 2955 r y H

k

e w

A y y Magothy aquifer. The inferred northern limit of the Magothy aquifer, the inferred extent of the

7.13 R 40 w

d v k Montauk v d P H

Bl 14.16 e n State S 50546 30 wy Linden (Sho uther S 46713 re Pk Southern S So S 51298 W Jameco aquifer, and the aquifer in which each well is screened are indicated on this map.

O wy) tate 27.37 y

P w i B c k

w e H l

y S 66145 is S 60812 l 13.08 e

36.11 S 63618 r i

e n

ern H Su a

a h S

l t t a m

t u t e

n e Public-supply pumping and elevated chloride levels have lowered the potentiometric surface

y o P c P k S wy 26.20 25.59

P N 9

kw B 19.69 k F

k y N 11166 e s l

k P lt w

P o w y lt k

w Q 3112 c

a e

B Q 3109 M 30 y h

y y ATLANTIC OCEAN below NGVD 29 in southern Nassau County (Lusczynski and Swarzenski, 1966). 19.06 d

w Su er

h n r S 37681 e

Q 1187 r ic 17.95 g is k P

i 6.10 e R r Mo Mon S 69364

H 4.26* H d N 8214 n ta k

S uk s t w g w 28.38 a Hwy 9.12 t The altitude of the potentiometric surface in the Magothy aquifer on Long Island during

in y u BAY RICHMOND K a k 18.91 y N 3867 26.82 t H e S 66156 w 20

P y COUNTY R April–May 2013 ranged from about 5 ft below NGVD 29 in extreme southwestern Nassau County 5.08 k I K S 42762 C w I 13.17 MORICHES H N wy Magothy and Jameco Aquifers R 20 H y M G o e PATCHOGUE y) A B c N 180 nris 18.80 BELLPORT S u to more than 80 ft above NGVD 29 in northeastern Nassau County. In Kings County, 2 measure- O w A k N 11579 S k C a N C BAY P I Y w BAY

O D The Magothy aquifer of upper Cretaceous age is the most extensive unit in Long F e A a 14.03 l U r y ( a 14.52 C S y ments ranged from 2.77 to 6.58 ft; in County, 8 measurements ranged from 4.26 to 32.05 t o N h w b M B O o 0 r k u h l T e P v U s A y EXPLANATION S Hw Y d y d e Island’s groundwater system. This aquifer underlies most of Long Island and the offshore P h lv ris ( N k a J a B Sun NICOLL w B A ul T s ft; in Nassau County, 29 measurements ranged from -4.90 to 80.00 ft; and in Suffolk County, 55 v Y in Y y T ) e UN n BAY C S CO Pe waters, except in parts of western and northern Kings and Queens Counties, northern r EN TYN 11634 R o E N M d QU OU o s U C errick R measurements ranged from 3.61 to 75.90 ft above NGVD 29. s SA 10 b S -4.90 B NA wy e Inferred extent of the Magothy aquifer Nassau County, and northwestern and northeastern Suffolk County, where it has been a H r S 52163 uk t y Monta K 3407 M B

l o 15.40 v S 79408 removed by erosion and glacial scour. The altitude of its upper surface ranges from more LOWER 2.77* d s e

s W 6.65 T Inferred extent of the Jameco aquifer

a ? than 200 feet (ft) above the National Geodetic Vertical Datum of 1929 (NGVD 29) in parts of w N

B S

n

e M U

lt y A i References Cited NEW YORK P w n

k N 3862 t F

S K 3414 e a

F C

g S a

O north-central Nassau County and west-central Suffolk County to more than 600 ft below

h a A

d N 6510 L

6.84* u 18.0 S U o

6.58* EAST K Lusczynski, N.J., and Swarzenski, W.V., 1966, Salt-water encroachment in southern Nassau

s

w t

GREAT SOUTH BAY Line of equal potentiometric-surface altitude—

C C e

BAY a

O

b 4.65* O BAY w

t USGS 404030073293703 N 180 NGVD 29 in north-central Suffolk County (Smolensky and others, 1989). Aquifer thickness e

U r SOUTH 20 U a Shows altitude at which the water level would have stood in

o N and southeastern Queens Counties, Long Island, New York: U.S. Geological Survey P

TY N y

N o OYSTER T

k U T

2.0 O k C Y

w

S TY Y tightly cased wells, April–May 2013. ranges from zero in northern and western Kings and Queens Counties, northern Nassau NG UN S BAY

I y K CO t Water-Supply Paper 1613−F, 76 p. NS a 16.0 USGS 403517073430702 N 6702 EE t Solid where approximately known; dashed where inferred. QU e County, and parts of northern Suffolk County to more than 1,000 ft in south-central Suffolk 40°50' P k Contour interval 10 feet. Datum is NGVD 29. Schubert, C.E., Bova, R.G., and Misut, P.E., 2004, Hydrogeologic framework of the North Fork N 6702 w y County (Soren and Simmons, 1987). The Magothy aquifer is the principal source of water 0.0 -2.60* and surrounding areas, Long Island, New York: U.S. Geological Survey Water- p Pkwy Pkwy 14.0 Monitoring well—Red circle indicates observation well screened NO DATA Lido Loo Ocean supply in Nassau and Suffolk Counties. Blvd N 6850 in the Magothy aquifer; Red circle with thick border indicates Resources Investigations Report 2002−4284, 23 p., 4 pl., scale 1:120,000. 3.95 NO DATA S 58922 This map depicts water levels during April–May 2013 in wells screened in the -2.0 supply well screened in the Magothy aquifer; Orange circle Smolensky, D.A., Buxton, H.T., and Shernoff, P.K., 1989, Hydrologic framework of Long Island, N 11109 2.55 indicates observation well screened in the Jameco aquifer. Upper number 40°30' S 21311 12.0 Magothy aquifer and the hydraulically connected Jameco aquifer. Most water-level -1.46* Ocean Pkwy is well number assigned by the New York State Department of New York: U.S. Geological Survey Hydrologic Investigations Atlas HA–709, 3 sheets, 10.00 measurements used to prepare this map were made in wells screened near the middle Environmental Conservation; lower number is potentiometric-surface scale 1:250,000. -4.0 EXPLANATION altitude in feet, NGVD 29. Asterisk (*) indicates water level influenced of the aquifer and were supplemented by some measurements from the basal zone. Only Daily altitude (NGVD 29), feet 10.0 Daily mean altitude (NGVD 1929) by elevated chloride values. Soren, Julian, and Simmons, D.L., 1987, Thickness and hydrogeology of aquifers and confining Water level shown on map (NGVD 1929) a few water-level measurements made in the upper part of the aquifer were used. Mea- EXPLANATION units below the upper glacial aquifer on Long Island, New York: U.S. Geological -6.0 NEWD YaOilRyK mean altitude (NGVD 1929) 10 0 10 MILES 400 feet Land surface topography—Shows land surface altitude in feet, NAVD 88. sured potentiometric heads at a given location can vary depending on the depth of the well NEWWater JERSE levelY shown on map (NGVD 1929) ? 8.0 Survey Water-Resources Investigations Report 86–4175, 3 sheets, scale 1:125,000. N Daily altitude (NGVD 29), in feet EW screen, because vertical hydraulic gradients in the Magothy Aquifer can be large. NE Y 300 W OR JE K -8.0 RS Oct. 2012Nov. 2012 Dec. 2012 Jan. 2013Feb. 2013Mar. 2013 Apr. 2013May 2013June 2013July 2013Aug. 2013 EY 10 0 10 KILOMETERS Sept. 2013 200 ATLANTIC OCEAN Date Oct. 2012 Feb. 2013 Apr. 2013May 2013 July 2013 Nov. 2012 Dec. 2012 Jan. 2013 Mar. 2013 June 2013 Aug. 2013Sept. 2013 100 Date SCALE=1:125,000 0 feet

Base from U.S. Geological Survey digital data 1:100,000 series -74° -73°30' -73° -72°30' -72° Hydrology by Michael Como Lambert Conformal Conic projection For additional information write to: Standard parallels 40° 40' N and 41° 2' N, central meridian 74° 00' W Director, U.S. Geological Survey, 2045 Route 112, Coram, NY 11727 North American Datum of 1983 Water-Table and Potentiometric-Surface Altitudes in the Upper Glacial, Magothy, and Lloyd Aquifers of Long Island, New York, April–May 2013 Copies of this report are available on-line at http://ny.water.usgs.gov Suggested citation: Como, M.D., Noll, M.L., Finkelstein, J.S., Monti, Jack, Jr., and Busciolano, Ronald, 2015, Water-table and potentiometric-surface altitudes in the Upper Glacial, Magothy, and Lloyd aquifers of By Long Island, New York, April–May 2013: U.S. Geological Survey Scientific Investigations Map 3326, 4 sh., Michael D. Como, Michael L. Noll, Jason S. Finkelstein, Jack Monti, Jr., and Ronald Busciolano http://dx.doi.org/10.3133/sim3326. ISSN 2329-132X (online) 2015 http://dx.doi.org/10.3133/sim3326