I
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CDM -mwnenlal eng._., tclentlsts,
...... '~ CGniiAilltlll
October 4, 1984
Ms. Susan Santos u.s. Environmental Protection AgencyJFK BuildingBoston, MA 02203
Dear Ms. Santos:
I I I
)
CAMP DRESSER &McKEE INC.
One Center Plaza Bolton. MIUfCIIIIeltl 02108 1117 742·5151
Document Control No. 111-WPl-RT-AKFC-1 Western Sand and Gravel Site Water Supply Alternatives ScreeningWork Assignment No. ll-1L04
This letter and the accompanying attachments are to provide you with our preliminary screening of the nine alternatives which have been developed and our recommendations regarding the development of a water supply system for the affected residential properties downgradient of the Western Sand and Gravel site in Rhode Island. At this time, we believe that there is sufficient information on all of the alternatives to warrant selecting the alternatives for more detailed evaluation.
The u.s. Environmental Protection Agency, through its contractors and public hearing process, has generated nine different public water supply alternatives for the affected Western Sand and Gravel residents. Table 1 lists the nine alternatives and includes four general areas of consideration which influence whether or not the alternative should be considered further: cost, public health, technical considerations, an~ other considerations. We have tabulated existing c01nents and costs pertaining to the alternatives from existing information (Draft Record of Decision, ADL report, EPA report, GZA report). Although some of the specific details of the alternatives are not co~pletely defined, this .atrix provides a good relative evaluation of the various alternatives. The following represents an alternative by alternative discussion of the overall acceptability of each one:
1. Connection to Slatersville System. The c.apacity of the Slatersville syste., based on data generated by EPA and confirMed by COM (10/2/84), appears to be inadequate to .eet the additional needs of the affected area. To supply water to the affected residences, the Slatersville syste. ..Y require new water supply sources, storage and/or booster pu.ping facilities. Also, recently collected Rhode Island Dtpart.ent of Environ~ental Managa.ent (RIDEM) data indicates that in the past, volatile organic c011p0unds were detected fn one of the three Slatersville wells. This syst is approxf..tely three •11es (shortest distance) froM the affected area.
I. I I I
~- )
CAMP DRESSER & McKEE INC.
Ms. Susan Santos October 4, 1984 Page 2
2. Connection to Slatersville/Industrial System. This alternative consists of connecting a small system used for industrial water supply near Slatersville and the Slatersville muntctpal system. Based on extsttng information and recent confirmation by COM (10/1/84), thts combined system would require a booster statton, new well, tnterconnecttng piptng, and other factltttes to be able to serve the affected area. Also, the owners report high iron concentrations in the wells. In the long run, it w6uld appear to be more instttuttonallyacceptable to consider the Slatersville system only and avotd the potential problems of a Slater~vtlle/Industrtal interconnection.
3. Connection to Masonville System. Based on extsttng data, this systemconsists of one well, whtch ct_oes. not appear to have adequate capacityfor the existing residences. The system ts approximately 1.1 mtles from the affected area.
4. Connection to Turex Well. As per COM's recent dtscusstons wtth Turex (9/26/84). this industry has only one well, which ts barely adequatefor Turex needs. Based on this, the system ts judged to have inadequate capacity to serve the affected area.
5-8 New Wellfteld Construction at Sttes A-D. See Table 2 and the following · discussion.
9. Connection to Glendale Association System. Based on extsttng data as well as recent COM discussions (9/12/84) with the Glendale Assocatton •anager; th1s systa. appears to be old and barely adequate to .aet present Glendale needs. Based on thts infonaation, the system ts judged inadequate to supply the affected area.
In summary, it appears that none of the existing systems are adequate to supply the affected area. Consequently, to supply the affected area exclusively fro. an extsttng water supply system, a stgntftcant investment tn one of the existing syst..s -.y be necessary. The costs associated wtth renovating one of the supplier systeiS, including long tran~ission Matns,and necessary booster stations, do not appear to warrant additional tnvesttgation to evaluate the feastbtltty of havtng one of the existing syst..s entirely responsible for the supply of the affected area.
For the above reasons, we have generated Table 2, which SUIIIrtzes the geologtc and geohydrologtc tnfor.atton regarding each of the four identified groundwater sttes. Three of these four sites are ..pped on Ft gure 6-3 of the ~ 1984 ADL report.
Revtew of the data presented in Table 2 indicates that stt s B and C are closest to known hazardous ..stes sites and, consequently, have th
I. I I I
() )
CAMP DRESSER & McKEE INC.
Ms. Susan Santos October 4, 1984 Page 3
greatest risk of future groundwater contamination from the two known contaminant sources in the area. Therefore, the site B and C costs reported on Table 1 include costs for moving the wellfield (reconstructing the wellfield 2,500 feet from the mapped location) sometime after the wellfield is in use. As Table 1 shows. if sites B or C become contaminated in the future. the eventual cost of using the site becomes more than the original cost of developing either site Aor D (Tarkiln Pond). which we have assumed would not require relocation. The reason that sites B anc C become more expensive is that either water treatment or moving the wellfield could become necessary.
We recommend that sites A and Dbe evaluated because none of the existing systems presently appear to have the capacity to supply the affected area. It appears that a new water source will be necessary. regardless of the location. Any new source development should probably be close to the affected service area. At this time, both Aand Dappear to have the adequate supply for the affected area; however, site Amay be capable of supplying more water than site D. due to more favorable aquifer thickness and transmissivity. Consequently, all of the alternatives reconnended for evaluation consist of a new stand alone well supply system with the possibility of a physical connection to an existing system for both physical back-up and institutional reasons (as appropriate).
In s~~~~~~ary. we recommend that the fo11 owing tasks be perforn~ed:
1. Conduct exploratory well drilling on sites Aand D.
2. Conduct extended pump tests on sites Aand Das appropriate based on No. 1 above.
3. Evaluate a new (site A or D) well supply system with possible connection to an existing system.
Evaluation of the results of the task will be the selection of one of three possible long-ten. water supply alternatives: new well system - site A. new well syste.- site o. new well syste. (A or D) with connection to an existing systa.. The selected alternative will be the basis of the Focussed Feasibility Study.
We believe that the above reco.~ended progra. is the only realistic option. Therefore. we request your approval of the groundwater testing progra. as outlined in our work plan. We suggest that extended pu.ping tests be conducted s11Ultaneously at sites A and D (1f appropriate) to expedite data
I I I I
CAMP DRESSER & McKEE INC.
Ms. Susan Santos October 4, 1984 Page 4
collection. Therefore, we will conduct simultaneous extended duration pumping test unless you inform us otherwise. Please contact one of us or Mr. Paul Williams of this office, if you have any questions pertaining to this recommendation.
VerY, truly yours,
.CAMP DRESSER &McKEE INC. Approved by:
1/..~f~~~~ William R. SWanson 51 te f·1anager
Dr. Richard J. HughtoREM II Region I Manager
WRS/PMW/mhd
Enclosures
cc: Mr. David F. Doyle, COM Mr. William DiTullio, COM Mr. John Hartley, RIDEH
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sftutto
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sJStM
.
o lllld IC(J
IIf tton
o tile
publfc Ills suggested tilts stte
for lo
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ell field
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tll be n
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lfsh .. fn
stftutfo
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ater ~tatton S
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o The extsttng wn
1s
located about 1.5 !Iiles W
1l1 fra.
affected IaR
S.
o The existtng wll
blrely has the c:apactty (about 30 !Jill) to
satisfy
dBunds o
f A
ssoctatton. o A
ssociation's dts
tr1button syste
l is old
(1932) and conststs o
f 2-in
. d
1..e
ter ca
st iron
.ain
s; it .auld
n
ot be ~
to
convey wter ~
ly
to B
urr111vtlle.
All cost _
. d
iUtn
m fra. &
M.......U
l Resource
~tetes, tit. report to
EM
, Ap-tl 9
, 191M, except llle
re noted.
(l)Ottler canstd!rlttons tnelud! tnstttuttonal canstclerations, w
tl11191!'SS of en
tities imolvat and land at(JIS
1tton.
OTlER ailS IID
AT
IOG
(1)
o it .auld
be necessary to construct a new w
ll, rennovate th
e extsting llll"'ing
and distrib
utio
n
SysteiiS
, and construct a
bo
ut 1.5 •ile
s of new
wte
r trans.issio
n
.ain
s. T
he resultirig costs o
f tilts alternative .au
ld be
exorbitant.
< 2>rou1 casts lined
en unit pr1ees, percentages, and prablble footages estt.ated by E
nvi~al R
esource Associates (E
M), A
pr11 9
, 191M.
Does not
tnclude
stor191 tn
ani ~ costs.
(l)Co
st •ttlllte lin
ed en p
on
tble c:anta.tM
tion at ftrst wllfte
ld and need to II!V
e w11f1eld iP
P"'X
illltely 2500 feet. C
osts of IIIV
fng w11f1eld (E
M, 191M
-
dollars ba
ed
en EM u
rrtt pr1
ca arw ~ to
be less thin
or equal to
a vo
latile organic treat.ent facility
.
( 4)A11
costs based en EM e
ti-..s
for Site A
.
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RA
TIDII SIT
£ SELECTIDII
WE
smtl SA
il» All» liRA Y
Et SIT
£ IU
Rit IllY
Ill£ • RHOOE
ISLAII»
Present and E
xpected future S
urffcfll Geology
Grourldlflter 9!!! 11 ~
flood platn -stlty
W
ell .auld
tnduce tnffltratto
n
allu.tu
. underla1n(2 ) fra1 S
llterSv
tlle Resen
otr.
bJ sand and grevel S
fte ts located up-grldtent fra~
cont..tnated site; no future
water qualtty p
rob
l.s are ant f ct p
ated.
ec.. d!lta -
tfltn W
ell .auld
tndUCII! tnffltratto
n
~well-sorted
fn11 SllterS
vtlle R
esenot,.. gravel
Oft!" 1 xt ng
Stte ts
loe~ted cbln-grldtent COI~)or ftne
,,. cont..tnated sfte lnd
Sind aJU
id possfbly fnten:ept con
t.-tnatton.
ec.. d!l ta wfth
SO
le W
ell .au
ld induce fn
ffltratfon
E
sker -pebble to
fl'lll Slatersv
ille Resen
ofr.
cobble gravel ln
d
(2 ) S
tte could posstbly tntercept S
ind. p
oo
l' ly sorted conta.tftlttan fn11 U
RR
llnd
ftll stte
.
ec.. d!l tl wfth
SO
le W
ell .auld
fnduce inffltratto
n
Crev
iS• ftlltn
g -
pebble fn11 T
ritln P
ond. and stte ts
to cobble gravel lnd
up-grldtent fn11 any k1101111 sand.
po
ol' ly sorted.
sources of cont..tftltfon; no
lOC
il tflfn 1~ o
f future M
iter CJJ~ltty pro
bl.s
stlt and cl~
are ant f cf pated
.
locltfo
n A
elatfve To A
ffected Area
(Un
gth
tn feet or T
rans.tssfon Mlfnl
Accessfb111ty
3.200 E
astly Accesstble
450 E
astly Accessible
2.850 Poorly A
ccessible
2.600 E
asfly Accessible .-( --
(l)Oitl cM
.Itned fra1 ~logic._ o
l tile lrln
dl R
her B
astn. Rhode
Island. found fn Anfllbfl!~ of G
round 111ter fn the Brlnch R
fver Basfn. Provfdence
Cclur(y • .
._
Island. bJ H.£ • .Jenison M
d D.C
. Dtc
ar-t. USGS. w
ater Resources
Investt!iif1ons is-4. D
!liilii!r 1974.
(Z)O
btafned fral G
eolagfc ... ol tile
Georgtw
flle C)lld
rqle. R
hode Island. found fn 1lle G
eology and &roun1141ater R
esources or the Gl!c!rgfw
flle !)!ldrangle. Jlttodl
blan
d bJ &
.M. R
fdlm
ld M
d W.l. A
llen. 1951.
miO
::>a
ll aA
IJ.Y
liJ.S
INIH
aY
'l:iA
YliD
am
c a
me
s Nll~.r.saM
pewnJ. uu1eq
~uewn:»op "I~ J.O ~~1renb ear~ o~ 'enp 11 ~I 'e:»1~ou lllf~
UVlf~ JVII:» 1881 II
IBVWI W
IJJ. llf~ J.l =3:>UON
_____ ._._
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