HomeMy WebLinkAboutWATERMAN FARM ROAD 0 1 7-4��VI l�� ��IR m-j)� I v&
BSC GROUP
Providing solutions that create value 349 Main Street
(Route 28), Unit D
West Yarmouth
MA o2673
gay 221, k6
v Tel: 508-778-89i9
�{ ,� _ =
Town of Barnstable Boo-z68-8tz3
Board of Health Fax. 5o8-778-8966
200 Main Street
Hyannis,Massachusetts 02601 www.bsegroup.com
SUBJECT: Proposed Sewage Disposal System
40 Waterman Farm Road
)3st�bk, Massachusetts
Assessors Map 207, Parcel 91-2, Lot 1 (11.7 Acres) �<
r
On behalf of Dr. Nathan and Dr. Kathryn Rudman and in direct response to th ! -v 71a
comments of the Board at our meeting on March 21s BSC has modified the plans with
the
specific goal of having the septic system components located a minimum of 75 feetCD-
P
from all wetland resource areas.
Further, we have completed additional soil testing confirming the soil characteristics and
depths to groundwater in the specific locations of the proposed soil adsorption system.
This task has eliminated the need for a variance requested in the initial filing.
The plans now indicate:
• A 60 scale plot showing the entire 11.7-acre parcel. (This was included as an 8
/1/2 x 11 in the original application as figure 3).
• The elimination of one bedroom reducing the design from 6 to 5 bedrooms.
This reduces the nitrate loading of the original design by 15 percent from 1.5 to
1.3 mg./I. (See attached spread sheet for detail).
• Additional soil test pit information confirming prior testing.
•, Modification of the septic system configuration has increased the setbacks to
wetlands as follows:
Engineers
Setback to Setback to
Environmental
Wetlands Wetlands Scientists
Original Design Revised Design
GIS Consultants
Primary 67 feet 91 feet
Landscape
SAS
Architects
Reserve 58 feet 75 feet Planners
SAS
Surveyors
q
F
f Health Variance Request
I� y Board o40 Waterman Farm Road
Barnstable,MA
May 21,2007Page 2
• Modification of the septic system configuration has modified the setbacks to
Local Coastal Banks as follows:
Setback to Setback to
Town Coastal Town Coastal
Bank Bank
Original Design Revised Design s
Primary 71 feet >100 feet
SAS
Reserve 81 feet 77 feet
SAS
• The hydraulic setback to wetlands, based on ground water flow directions, is
calculated at:
o 110 feet for the primary Soil Adsorption System,and,
o Over 250 feet for the reserve area.
• All system components are 100-foot minimum from the extreme high water
mark.
• Installation of 3 additional piesometers to define the groundwater flow direction.
On September 11, 2006, BSC visited the Site and observed water levels in
thirteen (13) piezometers at locations as indicated on the Existing Conditions
Plan (provided in Attachment 1). The piezometers are two (2) inch diameter
PVC casings and were screened in the groundwater in order to determine the
elevation of the groundwater table. It is noted that the original water level
readings were generally somewhat higher than this latest round of readings
because the piezometers were originally measured during an extreme high tide
I event in order to characterize tidally influenced groundwater conditions during a
"worst case scenario'. BSC measured groundwater elevations at the piezometer
locations at the time of high tide on May 16, 2007 during a 10.6-foot tide,
somewhat above normal, using a Solinst water meter probe. Specific
groundwater elevations were then calculated by using instrument survey
elevation data for the tops of each piezometer casing and then subtracting the
depth to groundwater measurement. The elevations of the groundwater at the
Site range from EL 6.5 to EL 3.5 NGVD throughout the Site. (Groundwater
elevations observed are noted on the existing conditions plan). Review of the
groundwater elevation data and flow direction indicates an existing groundwater
gradient of approximately 2 % in the vicinity of the proposed primary septic
system with a southeasterly groundwater flow direction. This latest round of
readings confirms the direction of groundwater flow as being consistent with that
measured in the initial round although the area of the primary soil adsorption
system, a slight seasonal shift was observed where the flow direction moved from
more southerly to a south-easterly direction.
• The proposed septic system design remains fully compliant with the State
Environmental Code "Title 5" (310 CMR 15.00) including Section 2.11
Minimum Setbacks.
LJ
Town of Barnstable P#t /3�0
Department of Regulatory Services
KAM H Public Health Division Date
d 2W Main street Hyannis MA 02601
Date Scheduled. f `� � [ Time Fee Pd. /&+tl, DZ)
Soil Suitability Assessment for Sewage D posal
Perfomted By:15 t c I I i Vitir(r FPy)�C ee'i-if', in C. Witnessed By: A
'90 r7 A P-E
LOCATION&GENERAL INFORMATION
Location Address Owner's Name
fi,&Ma J 1(,
G en tars 11 p; iGt it p Address /7o,
Assessor's MaPT—L•AP o2o 7 B s NaCmev
�u.l ii ru.,. ���•Sh C
NEW CONSSTRUCTION �ii_ REPAIR Telephone# 5 0�-'lad'-3 3 y y
Lead Use R(T 'A4'I4�tc, \ Slopes NO. 0—1070 Surf=Stones
Distances from Open Water Body Z l O l+ ft Possible Wet Area S l ft Drinking Water Well /V ft
Drainage Way /✓ ft Property Line 3 , $ Other J(f ft
SKETCH:(Street name,dimensions of lot,exact locations of test holes 6t perc test,locate wetlands in proximity to holes)
.. • .Y:...i:.:.�.:::: ?.•�•'i:'i
r t :
,a r
s.
31
Parent material(geolo&) 04L4-Si`\
Depth to Bedrock '"—
t ,A
Depth to Groundwater Standing Water in Hole: Weeping fom Pit Face .M
Estimated Seasonal High Groundwater
DEP&RWATION FOR SEASONAL HIGH WATER TABLE
Method Used: cam. a.t J P-tt+/1'jm-wl t`Ai 5
Depth Observed staff in obs.bole: in. "Depth to soil mottles: in.
Depth to Warping Tom 41&of obs hole: in. Groundwater Adjustment ft
Index well# Reading Date: Index well level Adj.fuxor Adj.Groundwater Level_
PERCOLATION TEST nave `31Il TIM tt!
Observation
Hole# Tim at V
Depth ofPerc .���- Time.at 6"
Start Pre-soak Time @ Z5 tt9��av5 , J Tmre M-61
�h
FM Pre-soak
Rate MkAnch
Site Suitability Assessment Site Passed "� Site Failed: Additional Testins Needed(Y/N)
DEEP OBSERVATION HOLE LOG Hole#
Depth from Soil Horizon Soil Texture Soil color Soil Oilier
i Surface(in.) (USDA) (Mtmsell) Mowing (Structure,Stones,Boulders.
EC 15 Consistency,%Gravel).
� 5 -11A i/ _
e-y,. C
DEEP OBSERVATION HOLE LOG Hole#
Depth from Soil Horizon Soil Todure Soil Color Soil other
Surface(in.) (USDA) (mu sell) Mowing (Structure,Stones,Boulders.
Consbtencv_%Gravel)
0-5
-13 3�
F,
13'
zb to
DEEP OBSERVATION HOLE LOG Hole#
Depth from Soil Horizon Soil Texture Soil Color Soil Othet
Surface 010 (USDA) (Mansell) Mottling (StrucAve,Stones,Boulders.
_. Consistenev.%Gmveb
DEEP OBSERVATION HOLE LOG Hole#
Depth from Soil Hod= Soil Texture Soil color Soil other
surface ono (USDA) (Munsell) Mowing (Structme.Stones,Boulders.
Cortsistencv %Gravel)
Flood Insumnee Rate Man:
Above 500 year flood botmdary No— Yes
Within 500 year boundary No_ Yes_ x v;
Within 100 year flood boundary No_____ Yes_
Depth of hiaturally Occurtane PenIOUS Material
Does at least four feet of naturMlly occulting pervious material exist in all Mas observed throughout the
area proposed for the soil absorption system? YG-S
If not,What is the depth of naWrally occurring pervious material?
Certification
I Certification
that on ( U`f (date)I have passed the soil evaluator examination approved by the
fY --
Departmertt of Environmental Protection and that the above analysis was performed by me consistent with
I -
1
' z
• Board of Health Variance Request
40 Waterman Farm Road
Barnstable,MA
May 21, 2007Page 3
• The SAS has been converted from a galley system to the trench system preferred
by 310 CMR 240(6).
• The site has been re-graded to eliminate several hundred cubic yards of fill.
• The site has been revised to eliminate several hundred linear feet of retaining
wall.
• The beat storage barn has been reduced in size by 30%
VARIANCES REQUESTED.
The.Applicant. requests plan approval by the Board of Health with variances from the
_Code of the Town of Barnstable Massachusetts. Part III Board of Health Regulations,
Chapter 360 On-Site Sewage Disposal Systems for the above referenced Site.
The design compliant liant with the Code of the Town of Barnstable Regulat
ions for On
-Site
Sewage Disposal Systems excepting the Article I-Setback Requirements of Chapter 360-1
that requires a 100-foot setback from vegetated wetlands and top of a local coastal bank.
Setbacks are summarized as follows:
Setback to Up- Setback to Setback to Town
j gradient BVW Down- Defined Coastal
gradient BVW Bank.
The primary SAS 91 feet (9 foot 102 feet NA
variance)
The reserve SAS 75 feet (25 93 feet (7 foot 77 feet
foot variance) variance) (23 foot variance
required)
Septic Tank 84 feet (14 108 feet NA
foot variance)
OPINION ON EQUIVALENT DEGREE OF ENVIRONMENTAL
PROTECTION
The same degree of environmental protection is proposed based on-site specific
hydrogeologic conditions as summarized below.
Based on:
1. Full compliance with Title 5, and,
2.. The I I0-foot minimum hydro-geologic flow path of from the primary
soil adsorption system to the BVW,and,
3. The 250 foot minimum hydro-geologic flow path of from the reserve soil
adsorption system to the BVW,and,
ji
fi Board of Health Variance Request
40 Waterman Farm Road
Barnstable,MA
May 21, 2007Page 4
- 4. The 120-foot minimum setback between the primary soil adsorption
system and the extreme high water mark,and
5. The 100-foot minimum setback between the reserve soil adsorption
system and the extreme high water mark, and
6. The fact that Title 5 breakout standards will not be violated by the
existence of coastal banks,
7. The fact that all coastal banks are tree covered and non-eroding,
8. The low nitrate loading(1.3 mg/1).
BSC is of the professional opinion that these findings(especially the hydrologic distance
from the soil adsorption system to the wetlands)will provide the-same degree of
environmental protection as that offered by full compliance with said regulation.
MANIFESTLY UNJUST
The denial of the requested variance would result in the denial of use of the subject
property for its residential use as a use by right under the Zoning Bylaw. BSC is of the
professional opinion that the proposed system as designed provides an equivalent level of
protection as is provided by Section 360 of the Barnstable Code of Regulations. As such,
any denial would create a manifestly unjust condition and corresponding severe financial
hardship for the applicant, Dr. Nathan and Dr. Kathryn.Rudman.
Sincerely,
BSC Group, Inc.
David). Crispin,PE,PIS
Senior Associate
cc:
Dr. Nathan Rudman
P:\PRJ\4606900\Board of Health Variance\Board of Health Variance summary Letter-MAY 15-2007.doc
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LOCATITNO 40 Wate0 Bsc Viu.JVl
LOCATION 40 Waterman Road,f3arnaleble•Lot 1 �/...1■
DATE tulsy 15,2007
NITROGEN LOADING CALCULATIONS WITHOUT TREATMENT
APPLICAMONIUSE: PROPOSED SINGLE FAMILY
Proposed @ of Bedrooms
EKtS N'TI G_ PROPOSED
LOT 1 SIZE: 509 652 sl. ILOT 1 sm I. 509.652 sf.
IMPERVIOUS SURFACES: IMPERVIOUS SURFACES:
Roof Area 1 G 8.1, ROOAMa-I 4550 sf.
PavedAreal1 PavedAreal 10689 st
MTURAL AREA 1 SMS52 S.L NATURAL AREA: 494403 sf.
I lawn dal lawni 6956181
TM.E V FLOW": 1
Eking l Oigpd
Proposed) 55016pd
RECHARGE
16 ndyr 1.5 fVyr Natural area,
40 Wyr 3.31t/yr Impar iou58rea
EXISTING
WASTEWATER
DO Wd x 3.785 UgaL= Ltd x 35 MWL = mg/d
IMPERVIOUS SURFACES:
Roof
�sf. x 40 Win x IV12in x 28.32 UV3 x tyrf365d= Ud
0 mgud x 0.75 mg/L. mgtd
Paved
0s1. x 40 in/yr x 0/12in x 28.32 UI03 x lyrrAW- Ud
0 mg/d x 1.5 mg/L= mg/d
LAWN
�a.l, x 3lbs/1 OWsf W x 1 yr/365d x 454,000 mgfb x 025= Omgld
NATURAL
509652 sl. x 1.5 0/yr x 28.32 UIN3 x tyr/365d. Ud
0 + 0 + 0 + 0
0 + 0 + 0 + 5 3316
'AOPQSt�WIT110UiTREATMENT
WASTEWATER
550 gpd x 3.785 Ugal.= Ud x 69 ffg. mdd
IMPERVIOUS SURFACES:
Roof
4560 s.f. x 40 In/yr x WIZA x 28.32 L/fM3 x tyd365d a -:xy.1 Ud
1179 mgfd x 0.75 mg&= mgfd
Paved
10669 s.L x 40 iW x 1V121n x 28.32 LM9 x 1yr/365d- �379A Ud
2764 mgfd x 1.5 mgA.= '147 mgfd
"_AWN
6956 a,[ x 3lbs/1000styr x 1 yr/36M x 454,000 mg/lb x 0.25= - B69 mgfd
NATURAL
4944A1 sf. x 1.5"x 20.32 LIR^3 x tyr1365d= Ud
72861 + e85 + 4147 + 6489 = 1.3 ppm
2082 - +- 1179 + 2764 + 57640
11511812007 3:44 PM Nitrogen loading worksheet-5 bedroom.xls Max NO3 Loading w•o treatment
ann/ Nr'�Y�87wv�a "n:a•�unn� mnm.e
8c e[xna s W ra usacroxaTnNuc m na 4 am
SOIL TEST PIT DATA (5-1-07): Maaa4°o a., v.. •� Win" A °• w
l-fL wi an.JL •.n v0art.MvaIIIItN� 1ITT
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fe SrA f•,��s„• „,,,;s� SOIL EVALUATOR
om,n
a..rn 280A8C
CERTIFICATION
a=Ee M,an iof(.Wlfx '� DESIGN OF SEWAGE
INVERT FVATIONS OF SYSTEM' �a a;� J"�" °'; DISPOSAL SYSTEM
n, A_..mvTBx ,6 - A.(111) -)J.W-. 6 a ~ 40 WATFRMAN FARM ROAD
w,"AT savnc iANI!On) _lZEZ_ a I LOT 1
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ui:cr.WMsl. -QZ,tyr.ortan. i-FSrorAlEt fAOUnONAtEP
¢vsTEM PRDFlLE nrvA,nrr '" LEACHIN�CH Derails
DECEMRR 11.20M
SOIL TEST PIT DATA (8-3-05}
k _E Tsr. c.._ss_ ay..°mm.+lma. .a .. T. LxT u Ne�nSET�nr srnT�ic�waeAnan
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178 CAPTAIN SANADRAS'ROAD -
_ umn..�aAss FM ulwin i COt(8T•AIASSACHUSErts
02635
BSC GROUP
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k i SCHEMATIC FLOOR PLANS ISSUED FOR PERMITTING
j `y ¢nomn yixyrP/brt.
+wG� NOT FOR CONSTRUCTION ';Nn.wa:._atab.ao snrrY s: av
1 —
�I NETQy. DATE: 2
r7 �+ FEE: tS
• EAltNS[ABt$ •'
�a 'IM REC. By TCF
Town of Barnstable
SCHED. DATE:�:�t 7 0-7
Board of Health
2
_00 Matn Sheet,Hyannis MA 0-601
Office: 508-862-4644 Susan G.Rask,R.S.
FAX: 508-790-6304 Sumner Kaufman,M.S.P.H.
Wayne A.Miller,M.D.
VARIANCE REQUEST F01Uti1
LOCATION
Property Address: 40 Waterman Farm Road, Centerville (Barnstable) , MA
Assessor's?vTap and Parcel Number: 2 0 7—9 1—2 ("Lot. 1") Size of Lot: 11 .7 t AC
Wetlands Within 300 Ft. Yes x Business Name:
No Subdivision Name:
APPLTCANT•'SNAME: Dr. Nathan Rudman Phone 508- 9Zs- S/5`F7
Did the owner of the property authorize you to represent him or her? Yes x No
PROPERTY OWNER'S NA:'VIE CONTACT PERSON
1 Name: Name: David J. Crispin
BSC Group
Address: 178 Captain Samadras Rd. Address: 384 Washington St.
Cotuit, MA Norwell, MA
02061
Phone: Phone:
617-896-4451
VARIANCE FROM REGUTLATTON(List Reg.) REASON FOR VARIANCE(May attach if more space needed)
Article 1360-1 Setback Req. See attached letter
NATURE OF WORK House Addition C ????? House Renovation 'I Repair of Failed Septic System
hecklis (to be completed by office staff-person receiving variance request application)
Please submit copies in d separate completed sets.
_ Four(4)copies of the completed variance request form
,1 Four(4)copies of engineered plan submitted(ex.septic sysrem ptars)
Four(4)copies of labeled dimensional floor plans submired(ex.house plans or restaurant kitcher,plans)
#. Signed letter staring that the property owner authorized you to represent himiher for this request
.Applicant understands that the abutters must be notitied by certified mail at least ten days prior ro mectin_date at applicant's expense
(for Tide V ardior local sewage regulation variances only)
Full menu submitted(for grease trap variance requests only)
y5 .''.9C..___k S2_=_..^.y-5 =2at�. :_:a5 ....f3 9?.2:�=:�.�'�C
Page 2 of 5
IV. Variance Request (New):
CONTINUED A. David Crispin, P.E., P.L.S., BSC Group representing Dr. Nathan
UNTIL Rudman, 40 Waterman Farm Road, Centerville, 18.2 acre lot, new
MAY 22, 2007 BOH construction, six bedrooms proposed, multiple variances
requested in regards to setbacks to wetlands and coastal bank.
Unless it was totally impossible, the Board has never allowed less than 75 feet to
wetlands. Here there appears to be a number of locations for the septic (even if it limits
site to a 3-bedroom system instead'of a 6-bedrooms.)
The presentation stated the location to west is best due to water flow carrying it through
more soil before reaching wetlands even though it appears closer to wetlands. Their
information states the flow will be in a southeasterly direction. Sue Rask will run the
information passed the hydro-geologist at the County as a free service to evaluate the
presentation.
Dr. Miller wants a walk-through (preferably, after any changes in plans have been
submitted.) The Board voted to continue until the May 22, 2006, Board of Health
meeting.
BSC R
'GROUP
384 Washington St.
Norwell, MA 02o6i
Tel:781-659-7981
Fax: 67-345-8627
December 11, 2006
Town of Barnstable
Board of Health
200 Main Street
Hyannis, Massachusetts 02601
-;" SUBJECT: Proposed Sewage Disposal System
- 40 Waterman Farm Road
Barnstable, Massachusetts
Assessors Map 207,Parcel 91-2, Lot 1 (11.7 Acres)
Dear Members of the Board of Health,
On behalf of the applicant, Dr. Nathan and Dr.Katherine Rudman this letter is to request
plan approval with variances from the Code of the Town-of Barnstable. Massachusetts,
Part III Board of Health Regulations Chapter 360 On-Site Sewage Disposal Systems for
the above referenced Site.
I The proposed septic stem is designed for proposed six (6) bedroom single-family
P F P � Y Zm P P g Y
dwelling is compliant with the State Environmental Code"Title 5"(310 CMR 15.00). The
design is compliant with the Code of the Town of Barnstable Regulations for On-Site
Sewage Disposal Systems excepting the Article I-Setback Requirements of Chapter 360-1
f that requires a 100-foot setback from vegetated wetlands and top of a local coastal bank.
The proposed septic system design, shown in Attachment# 1, provides the same degree
of environmental protection as that afforded by the Town of Barnstable Code Regulations
for On-Site Sewage Disposal Systems for setbacks to bordering vegetated wetlands(BVW)
and coastal bank(CB)because:
1. A leaching area that uses Cultec Recharger units as approved by the DEP
f for general use.
2. The horizontal setback from the extreme high tide line as observed on Engineers
September. 11, 2006,.(the location where sewage effluent would first Environmental
meet surface water) is 108 feet at its closest point. This location is Scientists
hydro-geologically cross gradient to the setback line.
3. The hydrogeologic Flow path of groundwater as it passes under the Soil GIS Consultants
Adsorption System is 150 feet from the SAS to the BVW, exceeding that Landscape
required by the Town of Barnstable Code Regulations for On-Site Architects
Sewage Disposal Systems.
Planners
t
Surveyors
r01
Board of Health Variance Request
40 Waterman Farm Road
Barnstable,,MA
December 11, 2006
Page 2
+ the Septic System complies with the Title 5 setback to both state and
' locally defined coastal banks. The 100-foot local setback can only be
applied to the locally defined coastal bank under the Town of Barnstable
Code.Rem lations for On-Site Sewage Disposal Systems because the local
regulation supercedes the State regulation. Also; and more-importantly,
the coastal banks are non-eroding and tree covered such that there'is
minimal potential for retreat of the coastal banks and the banks
themselves are well above the seasonal high water level such no liquid
seeps from the banks. Further, 310 CM.R 15.255 allows for septic
systems to be 15 feet from 3:1 slopes. The proposed design is 71 feet at
its closest point to the local coastal bank such that by 310 CMR 15.255,
sewage will not break out onto the banks.
1.0 GENERAL SITE DESCRIPTION
The subject Site is located on the larg 18.2-acre Barnstable Assessors Map 207 parcel
91-2 and is identified as "Lot 1" on "Plan, 'a 0 Waterman Farm Road (Lot 3 LCC
32290D) .in Centerville, Massachusetts (Barnstable County)".dated August 30, 2604
prepared by BSC Group. Lot 1 is an 11.7-acre undeveloped irregular shaped parcel, of
which 6.3 acres are upland and the remaining 5.4 acres are wetlands bordering the
Centerville River. Lot 1 was created by a November 1.1, 2004 Barnstable Planning Board
endorsement of an Approval Not Required Plan (ANR) Form A. Figure 1 provides a
USGS Site locus. Figure 2 provides an Assessors GIS Map indicating the Site. Figure 3
provides a reduced copy of the ANR Plan.
The portion of the Site where the dwelling and septic system are proposed is mounded.
The high point elevations of the mounded areas are 19 feet NGVD and,16 feet NGVD.
Ground cover at the Site consists of medium dense tree cover with a small open
grass/brush area with wetlands located along the western, eastern and southern sections
of the Site. The wetlands located along the western boundary of the Site are shrub
swamp and the wetlands along the eastern and southern boundaries of the Site are salt
marsh that border along the Centerville River. Figure 4 provides a.copy of the Site on
the MASS/GIS wetlands map.,
The Barnstable Conservation Commission issued a Determination of Applicability on
June 15, 2005 for soil testing and access clearing at the Site (reference # DA-05045).
Later in October 2005, the Conservation Commission issued Resource Area Delineation
of the Site. The following jurisdictional resource areas were identified and their locations
were confirmed in this delineation: Bordering Vegetated Wetland (BVW); Town Coastal
Bank (TCB) and State Coastal,Bank'(SCB); Riverfrom area (to the Centerville River); and
" Land Subject to Coastal Storm Flowage. Attachment 2 provides a copy of BSC's July
2005 Abbreviated Notice of Resource Area Delineation submittal and,the ORAD issued
by the Conservation Commission. Additional permitting xvill—b wired with the
Conservation Commission for the construction of th,e (6) bedroord single-family
house and septic system.
i
CIO
` Board of Health Variance Request
40 Waterman Farm Road
Barnstable,MA
December 11, 2006
Page 3
2.0 SOILS
Review of the Barnstable County SCS soils map (Figure 5) based on a 1977 aerial
photograph and mapping indicates soil groups present at the Site include Carver coarse
sand (CdC and CdB) in the upland areas of the Site and Ipswich, Pawcatuck and
Matunuck(ImA)peat along the wetland sections of the Site.
On August 3, 2005, BSC conducted two(2) soil test pits on Site. Mr. Donald Desmarack
of the Barnstable Board of Health observed the testing.. Soil Test Pit Logs are presented in
Attachment 3. Soil conditions were observed to consist of:
Loamy Sand(10YR 3/6)to 10"below grade;
Fill-Medium Sand(10YR 6/6) to 33"below grade;and
Medium Coarse Sand(10YR 7/4) to 120".
` No water or soil mottling were observed in the test pits at depths of 10 feet. The
percolation rates were 2 minutes per inch in both soil test pits. As pan of the hydro-
geologic assessment 9 other borings were completed by hand auger all of them
confirming course clean sand under the entire area. The..proposed sewage disposal system
is located in an area that has four (4) feet of naturally occurring pervious soil below the
entire area of the leaching facility.
3.0 GROUNDWATER ELEVATION DATA
On September 11, 2006, .BSC visited the Site and installed nine (9) piezometers at
a locations as indicated on the Existing Conditions Plan (provided in Attachment 1). The
r piezometers are two (2) inch diameter PVC casings and were screened in the
i groundwater in order to determine the elevation of the groundwater table. It is noted
that the piezometers were measured during an extreme high tide event in order to
characterize tidally influenced groundwater conditions during a "worst case scenario".
BSC measured groundwater elevations at the nine (9)piezometer locations using a Soli fist
water meter probe. Specific groundwater elevations were then calculated by using
instrument.survey elevation data for the_ tops of each piezometer casing and.then
subtracting the depth to groundwater measurement.
The elevations of the groundwater at the Site range from EL 6.64 to EL 4.10 NGVD
throughout the Site (refer to Figure 6 for groundwater elevations). Review of the
groundwater elevation data and apparent direction indicates an existing groundwater
gradient of approximately 0.9% in the vicinity of the proposed septic system with a
{ southeasterly groundwater flow direction. It is noted that the Site hydrogeologic
information corresponds favorably to the 1992 Barnstable Groundwater Contour Map,
which indicates a regional southeasterly groundwater flow direction in the vicinity of the
Site. Figure 7 provides a copy of the 1992 Barnstable Groundwater Contour Map
Y indicating the Site locus.
s
i �.t
Board of Health Variance Request
40 Waterman Farm Road
Barnstable,MA
December 11, 2006
Page 4
4.0 NITRATE LOADING
Review of the Town of Barnstable Zoning Map indicates that the Site is located within an
Aquifer Protection Overlay District(kPOD)..BSC calculated the nitrate-nitrogen loading,
for the subject property in the existing and proposed conditions.
-Based on the information and data contained and previously dct nented-hereut, BSC is
of the conclusion that the proposed septic system designwfor'six (6) bedro"ms will
for
r, k result in Groundwater concentrations below 1.5-mg/L nfi�q&nitrogen. Attachment 4
provides a nitrate-nitrogen loading spreadsheet for existing and\pioposed conditions.
5.0 OPINION ON EQUIVALENT DEGREE OF ENVIRONMENTAL PROTECTION
Based on:
1. Full compliance with Title 5,and,
2. The use of,the Cultec Recharger SAS snit. (See DEP General Use
approval in Attachment 5),and,
3. The 150-foot hydro-geologic flow path of from the SAS to the MV,and,
4. The 100-foot minimum setback between the septic system and the
i ) extreme high water mark,and
>'l
5. The fact that the coastal banks do not violate the breakout standards of
Title 5, and,
6. The fact that the Local coastal banks are tree covered and non-eroding,
BSC is of the professional opinion that this will provide the same degree of environmental
protection as that offered by full compliance with said regulation.
}
1
f
s Board of Health Variance Request
40 Waterman Farm.Road
Barnstable,MA
December 11, 2006
Page 5
i
6.0 VARIANCE REQUEST
On behalf of the applicant,variance is requested from the Code of the Town of
Barnstable. Massachusetts Part III Board of Health Regulations and Chapter 360 On-Site
Sewage Disposal Systems for setbacks to local coastal bank and bordering vegetated
wetlands per the table below:
Attachment 6 provides a list of abutters as required per Section 385-5 of the Barnstable
Code.
Minimum Setback Distances as per Barnstable Section 360-1
Septic System Required Proposed Proposed Setback to
Component Setback per. Setback(ft) Setback(ft) Extreme
36.0-1.(ft).to BVW Local Coastal High Water
Coastal Bank Bank Line 9/11/06
(CB)and
BVW
1,500 gallon 100 62 113 136
Se tic Tank
SAS 100 67 71 108
SAS Reserve 100 58 81 107
` Distribution 100 69 107 129
BOX
Buildin .Sewer 100 65 125 142
7.0 CONDITIONAL APPROVAL UNDER 15.104(2)
It is requested that the Board condition the approval under 310 CMR 15.000 for the
completion of two(2)test pits prior to the start of construction. It is fully expected that
soil conditions will be consistent witif soil testing completed on August 3,2005 and the
0 conditions observed in the nine piezometers installed in September 2006. The soil test
pits completed on August 3, 2005 were 100 feet south of the currently proposed SAS.
Based on the information included herein, the location of the testing completed in August
2005 would not site the septic system in a less environmentally protective location than
now proposed and would actually be hydro-geologically closer to the wetland than that
proposed.
0
tU
ej
Board of Health Variance Request
40 Waterman Farm Road
Barnstable,MA
December 14 2006
Page 6
8.0 MANIFESTLY UNJUST
i
The denial of the requested variance would result in the denial of use of the subject
property for its residential use as a use by right under the Zoning Bylaw. BSC is of the
professional opinion that the proposed system as designed provides an equivalent level of
protection as is provided by Section 360 of the Barnstable Code of Regulations. As such,
rf any denial would create a manifestly unjust condition and corresponding severe financial
hardship for the applicant, Dr. Nathan and Dr. Katherine Rudman.
' Sincerely,
BSC Grou , Ltae.
David j. Crispin, PE, PLS
` Senior Associate
cc:
Dr. Nathan Rudman
PAPRJ\4606900\Board of Health Variance\Board of Health Variance Letter.doc
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DATE: DATE:
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TEST BY: TEST BY:
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WITNESSED BY: WITNESSED BY:
DONALD DESMAI_ACK ,. DONALD DESMARACK NO. DATE DESC.
PERC. RATE PERC. RATE:
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SOIL EVALUATOP SOIL EVALUATOR
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