Half Moon Bay - Coastside County Water District · Purisima Watershed 92 1 ... 20 30 40 50 60 1940...

Purisima Creek

Canada Verde

Frenchm

ans

Cre

ek

Apanolio

Creek

Cori nda

LosTrancos

Nuff

Creek

MadonnaC

reek

PilarcitosC

reek

Arroyo Leon

Mill

sC

reek

Arroyo Leon

Denniston Creek

Figure 1Study Area

MapTODD ENGINEERSEmeryville, California

June 2003

Scale in Feet

80000

N

UpperPilarcitos

Watershed

LowerPilarcitos

Watershed

PurisimaWatershed

92

1

PilarcitosLake

Gauge11162620

Gauge11162030

Gauge11162600

Half Moon Bay

Pa

ci f i c

Oc

ea

n

Pilarc

itos

Ck.

LEGEND

Proposed Pilarcitos well field

Watershed

Groundwater basin

Gauging station

NunesWTP

~

TODD ENGINEERSEmeryville, California

June 2003 Figure 2Precipitation

at Half Moon BayAirport

0

10

20

30

40

50

60

1940

1942

1944

1946

1948

1950

1952

1954

1956

1958

1960

1962

1964

1966

1968

1970

1972

1974

1976

1978

1980

1982

1984

1986

1988

1990

1992

1994

1996

1998

2000

2002

Average = 26.40 inches

M

M

M

M

M

Water Year

Pre

cipi

tatio

n (in

ches

)

M Missing data

Legend


June 2003 Figure 3Average

Monthly Precipitationfor Half Moon Bay

1.66

3.19

4.39

5.41

4.40

3.81

1.96

0.74

0.29

0.110.19

0.40

0

1

2

3

4

5

6

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

Average Annual Precipitation = 26.40 inches

Mon

thly

Pre

cipi

tatio

n (in

ches

)

Month


June 2003 Figure 4Areal Distributionof Mean Annual

Precipitation

N

1

92

Pa

ci f i c

Oc

ea

n

280

36

38

40

34

32

4240

3836

3432

30

2624

22

20

18

4240

38

36

34

3028

28

26

24

32

30

28

3028

26

26

UpperPilarcitos

Watershed

LowerPilarcitos

Watershed

PurisimaWatershed

Scale in Feet

10,0000


June 2003Figure 5

Groundwater BasinLand Use

1977 1987 2002

Legend

Urban

Irrigated agriculture

Open space

Pila

rcito

sCk

.

92

1

Pila

rcito

sCk

.

92

1

Pila

rcito

sCk

.

92

1


June 2003Figure 6

Half Moon BayLand Use Plan

LEGEND

Source: EMC Planning Group Inc.

Canada VerdeCreek

Arroyo LeonCreek

PilarcitosCreek

Frenchmen’sCreek

Residential, Very Low Density (R-VLD) - 0 to 1 units per acreResidential, Low Density (R-LD) - 1.1 to 2 units per acreResidential, Medium Density (R-MD) - 2.1 to 8 units per acreResidential, High Density (R-HD) - 8.1 to 25 units per acreMobile Home park (MHP)Mixed Use, Commercial/Office (MU-C/O)Mixed Use, Light Industrial/Residential (MU-LI)Downtown Mixed Use, Residential/Commercial (DMU-R/C)Industrial, Light (I)Commercial, Visitor Serving (C-VS)Agriculture Business (AB)Urban Reserve (UR)Open Space, Active (OS-A)Open Space, Passive (OS-P)Public Service (PS)

Transfer of Development Rights Donor SiteTransfer of Development Rights Receiver SiteVisually Sensitive Site

Areas managed as open space conservationare not shown on this overlay. Please see theResource LCP map. Biotic resources shownare schematic. Areas of actual jurisdiction aredetermined in the field.

NOTE:

100

110

120

130

140


June 2003 Figure 7Annual Wells Drilled

and CCWDNew Connections

500

600

700

400

300

200

100

0

Legend

New WellsN = 612; no dates on 2 wells

New Connections

0

10

20

30

40

50

60

70

80

90

Num

ber

of W

ells

1952 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000Year

Num

ber

of N

ew C

onne

ctio

ns


June 2003 Figure 8Areal Distribution ofWater Well Drillers

Reports,Half Moon Bay

280

6181245

6 15

7

21118433 1

11191028 4

03561 06

01119 154

1

3

0

000 000

0

0 0

00 0

0

Pa

ci f i c

Oc

ea

n

T5ST6S

T4ST5S

R6W R5W R5W R4W

N

1

92

UpperPilarcitos

Watershed

LowerPilarcitos

Watershed

PurisimaWatershed

Scale in Feet

10,0000

18

LEGEND

Number of Wells


June 2003Figure 9

Streamflow nearHalf Moon Bay

1

10

100

1,000

10,000

100,000

Jan-59 Jan-64 Jan-69 Jan-74 Jan-79 Jan-84 Jan-89 Jan-94 Jan-99

Date

Dis

char

ge (A

cre

Feet

)

Purisima Creek Pilarcitos Creek at HMB Pilarcitos Creek below Stone Dam


June 2003 Figure 10Streamflow for

Pilarcitos Creek belowStone Dam (1997-2001)

Pilarcitos Creek at Half Moon Bay

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

Jan-97 Jan-98 Jan-99 Jan-00 Jan-01Date

Mon

thly

Dis

char

ge (L

og A

F)Pilarcitos Creek below Stone Dam

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

Jan-97 Jan-98 Jan-99 Jan-00 Jan-01Date

Mon

thly

Dis

char

ge (L

og A

F)

Average Discharge = 2,339 AF



June 2003

Purisima Creek near Half Moon Bay

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

Jan-66 Jan-67 Jan-68 Jan-69Date

Mon

thly

Dis

char

ge (L

og A

F)

Pilarcitos Creek at Half Moon Bay

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

Jan-66 Jan-67 Jan-68 Jan-69Date

Mon

thly

Dis

char

ge (L

og A

F)

Figure 11Streamflow for

Purisima Creek nearHalf Moon Bay

(1966-1969)




June 2003 Figure 12Average

Monthly Discharge atStreamflow Stations

Pilarcitos Creekbelow Stone Dam

11 20 20

484

1470

213

48 26 16 14 10 80

500

1000

1500

2000

2500

3000

3500

Mon

thly

Dis

char

ge (A

F)

Purisima Creeknear Half Moon Bay

86 70194

471 475

330 362

156 109 69 51 46

0

500

1000

1500

2000

2500

3000

3500

Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug SepMonth

Mon

thly

Dis

char

ge (A

F)

Pilarcitos Creekat Half Moon Bay

76

329

956

2925

3051

2412

1126

382

15069 42 26

0

500

1000

1500

2000

2500

3000

3500

Mon

thly

Dis

char

ge (A

F)

Average Annual Discharge = 2,339 Acre-feet




June 2003 Figure 14Lower Pilarcitos

Creek GroundwaterStudy Cross Section

400

200

0

-200

-400

-600

West

400

200

0

-200

-400

-600

East

-800 -800

PotentiometricSurface

5S/5W-30HBalboa

Well Field

Lower PilarcitosCreek Test Wells

Highway 1Main Street

Sea Level

78

1031

Purisima Formation

Scale in Feet

0

200

10000

Exaggeration1:5


June 2003 Figure 16Cross Section A - A’

near CCWDTest Wells

80

ANorth

60

40

20

0

-20

-40

-60

A’South

-60

Ele

vatio

n (fe

et)

80

60

40

20

0

-20

-40

Ele

vatio

n (fe

et)

Sea Level

85

85

100

8582

85

6490

110

1991

1997

TB4

aban

done

d(p

roje

cted

)

TW3 TW

5 TW2

TW6 TW

1

Hol

iday

Inn

(pro

ject

ed)

Pila

rcito

sC

reek

Cor

pora

tion

Yard

(pro

ject

ed)

Cun

ha

Purisima Formation

Sands andGravels

Sandy Clay

Silts andClays

Scale in Feet

0

20

5000

Exaggeration1:33

Sands andGravels

PredominantlySilts and Clays

88

Pet

roni

and

Son

s


June 2003 Figure 17Cross Section B - B’

nearBalboa Well Field

80

BNorth

60

40

20

0

-20

-40

-60

B’South

-60

Ele

vatio

n (fe

et)

80

60

40

20

0

-20

-40

Ele

vatio

n (fe

et)

Sea Level

80

Mic

kels

on

Purisima Formation

Sands andGravels

And

reot

ti (p

roje

cted

)

Kel

ly A

ve.

1957

Qui

llici

Dut

ra

Wel

l 4

Exp

lora

tion

hole

2

Pila

rcito

s C

reek

Wel

l 3

Ben

d in

Sec

tion

N1

H1

80

95

95 90102

1031

80

100

82

?

?

Coz

zolin

i (el

ev. e

st.)

Scale in Feet500

Exaggeration1:33

0

20

0

Predominantly Silts and Clays

80

CWest

60

40

20

0

-20

-40

-60

C’East

-60

Ele

vatio

n (fe

et)


June 2003Figure 18

Cross Section C - C’

80

60

40

20

0

-20

-40

Ele

vatio

n (fe

et)

Sea Level

Sto

ne P

ine

Roa

dC

ente

r

Purisima Formation

Sands and Gravels

Low

er P

ilarc

itos

Cre

ekTe

st W

ells

(com

posi

te)

Nur

sery

men

s E

xcha

nge

89

84

Our

Lad

y of

the

Pill

ar 1

977

1973

Hig

hway

1

Ben

d in

Sec

tion

Bal

boa

Wel

l Fie

ld (c

ompo

site

)20

7 to

347

AFY

PacificOcean

?

100

8485

95

70

60

Exaggeration1:50

FreshWater

SaltWater

PredominantlySilts and Clays

} }

Coarsening grain size observed in logs

Winter

Summer


June 2003 Figure 19Water Level

Hydrographs ofWells 29F04 and 32K

0

10

20

30

40

50

60

70

80

Jan-50 Jan-55 Jan-60 Jan-65 Jan-70 Jan-75 Jan-80 Jan-85 Jan-90 Jan-95 Jan-00 Jan-05

Date

Gro

undw

ater

Ele

vatio

n (fe

et)

5S5W29F04 5S5W32K

Scale in Feet

40000

Canada Verde

Frenc

hman

sC

reek

Apanolio

Creek

Corinda

LosTrancos

Nuff

Creek

Madonna Ck.

Arroyo Leon

Figure 20Water

Quality AssessmentTODD ENGINEERSEmeryville, California

June 2003

Ox MountainSanitary Landfill

1

92

Nurserymens

Holiday

Stone PineCenter

Corp. YardCunha

AmesportP

ac

i f i cO

ce

an

Pila

rcito

sCk.

N

LEGEND

Proposed Pilarcitos Well Field

LUFT sites

Book 56 area~


June 2003Figure 21

Water QualityAnalysis

B. Calcium - Sulfate Diagram

0

20

40

60

80

100

0 10 20 30 40 50 60 70 80 90 100

Sulfate (mg/L)

Cal

cium

(mg/

L)

Test Wells

Other Wells

C. Groundwater Source Diagram

1

10

100

1000

Ca MgNa+

K ClSO4

HCO3

Ions

mg/

L

TW1TW2TW3TW5TW6NerhanAmesport 1Amesport 2NM3NM1SP CTR4SP CTR6SP CTR1

A. Water Differentiation Diagram

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Na/(Na+Cl) in mmoles/L

Ca/

(Ca+

SO

4) in

mm

oles

/L

Test Wells

Other Wells


June 2003Figure 22

Groundwater SupplyEvaluation Site Map

TW-1

TW-6

TW-2

TW-5

TW-3

Pilarcitos

Creek

Buried ConduitCrossing

CarterHill

NunesWTP

14” PilarcitosSurface Water

Supply

TW-2 Potential wellPipeline sizeFlow direction

4”

6”

8”

6”4”

8”

8”

N

Scale in Feet

5000

Figure 23Groundwater Supply

EvaluationSchematic Diagram

June 2003


Figure 25Groundwater Supply

EvaluationTypical Well Equipment

June 2003


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Half Moon Bay - Coastside County Water District · Purisima Watershed 92 1 ... 20 30 40 50 60 1940...

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