FIELD INVESTIGATIONS OFUNCONTROLLED HAZARDOUS WASTE SiTES

TASK REPORT TO THEEMVIECMMENTAL FROTECTICM AGENCY

COMTRACT NO. 68-01-6056

A Kvcrolcgic Survey of A—y Creek L.ir.df:;'.TDD No. F3-5-08-11B

r.l'A Kc. r'E-!7dim!

Delaware Sand and Gravel LandfillTDD No. F3-S:OE-16E

EFA No. DE-01

Revision Date: June 8, 1962

to: Linda Y. Roorrfliinr, Ac:ir.r !MYEPA Region III

Prepared by:C. K, Lee

"nr.'.C1!/;"o.'.e;!'n G. McGsvurn', >"!"">. Ill

.onr\'rxr'y •:• "• n on\"i;•>r> v •?•>•• o -T f i ?i n*L 1_ V./ i O :-J f • , k 4 < I X. * A I I 1 \.f I Ik k . ! V. ,^ 1 I « - » i V •

A Kydrolepic Survey of Army Creek L a n d f i l l•••". •:.-. ??-?•.'•=-:''

Fee lien 2

?•.!.-•.,•;r-: fr.r^ crt Kr3v»; '.s-. .'i;!TM No, )'2-c.lCc-16;:

I-PA No. BE-0!

:.-r;.- cr CON?;::;:?

Section ^ Hydrclcjic Description

?oc::;r: f. Vc-v f r c-r.'. of Contsrinrrt s

Pettier. 6 F'..r'.hfr Hyc'rcf f-ologic Invest ijation

Section 7 Attachments

...o A t t a c h e d Tableso Attached Fipuroso List of Reference

fi D •".'• i": • 7 o o" 11 j 1; o / L J

i r( 3 G * 7 21»

A Hydropic Survey c! Arrry Creek LandfillTPP No. F3-B108-11F

EFA No. DE-17;,r-.d

L-r'. iw.-: .- ".,r: ..:•:: G r a v e l °-.i.r«;:':'.!

RKC<W!>:i:DA710NS

Zj.Tjr

o The Ariry CreuV .::•; :•.:•!,-•.;.-.:••; 5?ri and Crav»! f i r e s are ir'.ercrr.ncctedhydrccffclcjic.:!!;.'. Tr.t hy:rc!?;;ic survey cf both site? is presented

v,-;:h;r th:: r-;;::r:.

c Over the majority of the s i t e , the uppradient recharge grciindwater

ncvts benosih the : ^ r o f i : i < , rot thrc^rh the refuse. The sc-lhvesterncorner of :ht Arry Crosr: Larc::!; rr.ay receive scr.e Ul-:-r«! :r:undWBier

flow tr.rcuf'r, tr.c rc:"jj: .!;.•. :. :'...' '. . !:::•;.•:: :r. :: :'• ::r :••: •:•.•.-: =r

levels. This ir dfrrr.s :r r:c: vis a review cr l!??: colours (i.e.

befaro [."-r; ir.L- rf rf:c:very we; I .O .

o :n the sbForro o:' the cor clay layer, the surplus o;' rain wateri n f i l t r a t e s throupr; the pcrr.cablc cover n:s:eria! sni the refuse andconveys cent crir,;;nt5 tc the acuifer.

o Recent a n a l y t i c a l results i n d i c a t e that the piimpajie is effective incollectir.D the contaminated proundwater mipratirj away froir, thel a n d f i l l s .

o I n s t a l l a t i o n cf the- current recovery wolls he? ost the county S3rail lien. Ye:, sursisntis] entities ,-f h.-..-a:T;cuf r^t^riols ere s t i l l

r.rcter^t in the !.-r..-:fii: ard r-jp j cc-: ;>.'.;• r.;- trrt-a: tc the acuifsrand publ-.r r.,-^:h.

1 . 1

A Hydrolofic Survey of Arpy Creek L a n d f i l lTDD'No, F3-8106-11REPA No. DE-17 and?ci:vare F.-,:>d a .id Crr/.:! !.--?:-;i

Grovel site .''or iricrci fyinc the curs: i luorts of contsmir.at :un frore

t'::; Hie. r=::u

o A resair.plir.E (location is the same as those l i s t e d in Tehle 7) is

SMjtosled to verify result:: of recent ar.s'.ysos (Ncveirbor, !9fl).

o Csprinr the lardf:!!?. iirprrvir.? jrsdins tc dr.-ir; the excess rainfall

and t.o prevent the infiltration may be a cost-effective alternative

to the continued rate of prapinj and should be inves: ig;.:»d.

i fl u ij J 7 2 t)

S-CTIO:; 2

l. r, .-. •• •- -/ 0 '/M ft 0 u 0 / L I

A Kyd'/clopic Survey of Arrcv CreeV. LandfillTDD No. F3-810S-11B

EPA No. CE-17

::C No. r2-S!OJ-!B:

TNTR^Pl'CT! ON

Tl'.c Arry Cr-1-!- !.;:.•:']'!! i formerly j'dcirt i;;'<?ii .1? tin; I.Iorjo! Itr. L a n d f i l l ! 1is locste1- appr:>;;ii7,at c-ly two rr.leE southwest of (he City of New Castle,

northern banV. of Arir.v Creel: (See Figure i in Section "/. It tas s i t e - in anexcavated ssr.d and "r.r.c! pit nnd was opcrsr^lSty th« county :r s receptaclefcr -ere :h;n C.C'CC,:?: :^. yd:, of d:r;:ti:, c^:™er:i^:, -rd :r.i.;:?i :\ wastesfrom I960 to 1?C£. D.'.'R£C closed the site in the 1970's. The f i l l area isapproximately i.AOO fcc-t long, 200 tc 900 fc-et wide and 6 to 25 feet deep,covering rc'j;h!y 56 acr»F (:•••:. 1C).

The Delaware Sand and Grove! L.-ndfill is located ir~edisto!y east of theAmy Creek Landfill, along the southeastern barV of Arr-.y Crp»'fi (See ripure 1 inSection 7). The owner of (he l a n d f i l l possess^ about 1C acres of land inwhich 6 acres were operated between 1969 and 19"6, It was estircted thnt avo!u:re of '.fO,OGC cu. yds. of inert wcsscs bed been disposed yearly. A fit 150ft. x 7C ft. x :f. ft. cr, the n:rthcrn -t.r: ;f the rr:r?rty ccnrcirec dr'j-s oflic-'id containing about 375,000 gallons of i n d u s t r i a l chemical waste. Thisl a n d f i l l closed in 1976 after a Delaware State C-.i:rt action w,:r f i l e d (Kef.5) for improper operatiiif procedures.

In the Spring of 1972, a nearby well in the t.'prer Potomas Aquifer becamegrossly polluted. Subseouent investipotion confirmed that leachate percolationfrom the landfill was the cause. A set of leachate recovery wells was theninstalled 'ictween the l a n d f i l l s and the Amoco and Artesian w e l l f i e l d s (SeeTable 1). Tni? untreated va'.er pmped frois the reccvery wells is thendischarged into Army Creek,

The purpose of this study is to understand !'M-- i'r.''urjwatc-r c o n d i t i o n sand to e v a l u a t e the rr i p r a t io;i of contaminants frcr rcth l a n d f i l l f .

A HyHrolopic Survey of Army Creek LandfillTD2 Kc'. F3-8108-11B

if- A So. i.'.- •!?

Ei'A No. DE-Oi

Pleistocene strtcr dope.0:: which consists ;:rr;.;... r.sr.i ly -: ntciun :;• ccarsesand with gravel beds (See Fif. 2 in £ec:icn 7\ Ihis sand forr'.s a nearlycontinuous surficia! cover, ranginf; fro;r. 10 to 6C feet in thickness. The baseof the f.vrstics rnrsj^s fror c'rout 1C font cr-tvc- t; JO f*et below the nean sealavc-i in the- v:::r.:ty cf th-; '. :.id f: 1'.;.

Tne underlying rctomac ForDction consists of streair-depcsiteduncorsolidatec! sands, s i l t s , and clays of Lower Cretaceous Age. The formationis approximate!y 600 feet thick in the vicinity of the landfills. Potomac sandunits arc fer.era'. ly channel shaded containing interbedded clay and s i l tdeposits which accunulated on ancient floodplains and estuaries. The PotomacFormation chickens and dips towards the southeast at approximately 40 to liOfeet per m i l e ir the- study area.

Tr.t generally coarse Columbia deposits serve as an i n f i l t r a t i o n andrecharge gallery for the Potomac sands. Groundwater in the Pofonac sandbecomes confined beneath the relatively impermeable beds of clay and silt as ittravels seaward, dovn dip. Hydrolopically, the cor figuration of shallow

frounciwstc-r flow in the Cclurbia Formation is riischarping into the Arry Creek.Tnc- deeper prounduater flow • n the Pc'.ii-ac Forrsticn rtvc-f toward the re'.,:',.-r.reK i v o r.

3.1

r, {• < •-' -' of i O u u / J

TIC::

i U iJ / J

A Hydrolopic Survey of Army Creek LandfillTDD No". F3-8108-11E

£PA No. DE-1"

:•:: ;vcre Sand arc c.-ivc-l U'ldfillTDt No. ."J-e",:;-;::;

E?A No. DE-01

DESCRIPT!'"IN

Since the discovery of tin; aquifer ccr.tsnir.atien ;:r:Mir. free. thel a n d f i l l s late in l?:i, jrar.y w=::s have b*sr. d r i l l e d by ;:,u Cjs:!(; Cj;ir:y.c:....._.r, ,u. ;•.,.!.,;,.„ ...... ,.;..~ , , , j ,,„,!, „ f 'r.cc ttisr; '0 f<-s; :nj0 the

Columbia Fcrration or into the- refuse area. Eijh:y-s iver. deeper holes cf which16 are the lench.ili: rc-:ovr-ry w e l l s , were drMli-d into the Potcraac Formation.Approxir.iUely ha'.: of ti.e wr'.li sr? ;-b;r.d:nec cr csnr.it bo Iccsted ir. thefield. Ar: inventory of the w e l l s was developed from information available fromPNREC and is surraried on Table 1 of Section 7 of this report and theirlocstir:'!' are shcvr. cr. ":?. 1. About eichty percent of the wel'.s arc- concernedwith the Army Creek L a n d f i l l s i t e .

The amount of water in the Columbia deposits is constantly chflnginpwhich is i n d i c a t e d by rising or falling water l e v e l s in :he veils. The periodfrcr. mid-October to early April ir t y p i c a l l y a period of soil roisture surplusand groundvater r = :K:rj». The water levels r o n s r s l l y rose. The crc-vinc seasonfrom mid-April to mid-October is characterized by .1 moisture deficit anddeclining water levels. Tre Colur.bia Formation consists predominantly ofmedium to coarse sand with grave] beds, and the trar.sr: 5 £ :vi ty is hipher (SeeTable 3). Where not affected by man, the annual or seasonal fluctuation of thewater table is typically not more than 10 feet.

Eased on various literature sources, the confipuration of the watertable at the sites is shown by the jroundwater elevation contour rcaps inFigures 5 through 11. The important features of those i l l u s t r a t i o n s wereobserved as the following:

Ar, **i '• ', "i r, ftii! o u o / 3

A Hydrologic Survcv ;( Army Creek LandfillTDD No. F3-E10E-11SE?A So. !)•-!? and

Kydrologic Description

o 7:-,e f!iv o:' ::r:':r..-:wi.:ir in 'in: study arc-a is j-T.era'. :y frcr

r:rth : ; the •.--.::;•. vi:h an appr;:.:iratu natural hycraulicC.CC5 is. per ::. -j'. it v.,ri^ froir O.C1; ft. per ft. as

o 7!-,e urcrBii :-r.t ri.;.:r;c w.i-.er r:v-;5 -u.^der arc! beneath the lane:'::!silts (S=o "ig, : .'.:•.• i.; :•. -:, not thrc.,.;, the refuse, c-Kc = ps :r. :howestern ccrr.or of the Arr.y Creek L a n d f i l i where some lateral irovementco'jld occur d-je tr :he f !i:cf.:at ion of the pro-nduatcr ievs'.s.

o Punping frcro the production wells and the recovery wsl!f cre;S-:clocal ccnef of dc-rression arc, ;-.5.= lowered the wa;sr ievei ar -uch os

40 feet below the ir.tar, sea l e v e l , depending on t'-e rate of

of the pie:cre:ric surface arjund the l a n d f i l l ! - shoved thattvc flc'.Te:: aro di > t ri:-;-:d ir :V? rt-.-r!;.- :,r--:i. Or,- i? flovi^': frcr the

eastern part of Army Creek L a n d f i l l unit p.iEsinp beneath the Delaware Sand andGravel and flews tou-ari Ar.-ro's w e l l s (Sen Table 1 and Fif. 1). Another is

running frora the western part of Army Creek L a n d f i l l towards Artt - s i s n ' s wells

(See Table 1 and Fig. 1!.

Pump tests (Kef. 8) have been conducted in the I'ypcr Pctcr.ac Formation.The permeability is recorded as 500 ppd/sq. ft. and the transmissivity is about45,000 lo 70,000 gpd;:;. The kwtr foicir.ac rurifit ion has I rcr.;--:f r i v i t y v:!ut£less than 1,000 ppd/it. This i n d i c a t e s that the Upper Potcmnc is one of theiros: productive »rci:r.c'wn:c-r zcn:-s of New C a s t l e Cn.nty.

4.2

A Hydrolojic Survey of Anry Creek LandfillTDD No. F3-B108-11S•?A No. EE-I7 ariLel.-iWEft; S^rd ar.d Jri •.•-:'. L.-.r..;::! 1~-r NO. fj-cic:-:--:EPA lie. D--C!Hydrologic Description

?i frcr "arty's rrr—Ia (the dc:.".i:ed exr'.snation if rhcun ir, :if. iD.

This prcv:iii:£ « :•::... r:l ;;••• :r-l ir^: t: •-•:s'.::sr-r r«<: rpncirc c; ;r.-:!'.:c::cr. wells

as well £s recovery v e i l s , Recovery wells should be- spaced p a r a l l e l to tr.d as' . .-

far (fSaway as poss:ble"'i!ie boundaries of the landiill and as near to thecenter of a contaminant source as

A hydrclcci: r.,-r; b a l a n c e fcr the study area consists of estimating

water inflcv and v;:;r :••::: l.v/ :E •:•:«-. ir ?i£. 13, snd the d e t a i l e d

calculation is shewn on Tables 2, 3 nnd A, It estimates that only O.i',1 of thewater moving throujh Ariry Creek Landfill is by v e r t i c a l i n f i l t r a t i o n (about 5.million g a l l o n s a n n u a l l y , see Table !>'). The surplus rair. watsr c«c-:i:-.r t'r.rcuph

the refuse moves uown to the zone oi saturation ar.d causes stricjs iar.aje to:he quality of water in the Poicra.ic Fonr.acion.

i.2

SEC

A Hydrolopic Survey of Army Creek LandfillTDD No, F2-E10S-m

EP.A No. DE-17and

'.'DL> No. F3-5i08-163

xov:-:?1?::.": OF coNTAy:;v.;:T?

Ir. the Arry Crp-v L.in^ fi 11, rofuEt* pldc'^ept cr-rnc-ncod ac Lhe eaiitern

entrance aL the v£?tem end PI the- [:reotr 1 y, Ki na*. c:v-;r w.is corpust^ cr the

5 srd .ind ert" V31. Prevent I v nuri-'rous s ubs i dor.i; e di*prei';' i ens hsvft icrned u.ic

pit frorr vh;ch ."bout *.%-'?r.:y tc t h i r t y feet of t e r i i n r v send cr.c fvas'ti had been*—•_;•»rerrve- .'."."I ir. c;~~o ?'. ?c?s the •jpti^r'y:"!! c'.--y ;.-y.;r W.IE d'.s.? rc-rovo: (See Fig.

3) which can contribute to tht migration of i:.-,chito intc :hc a.'.;::'or.

It is esciir.atcd thet about 3.55 MGD o: jr;undv,-i:cr ftr.s u-Jiirr,c-5th thenrmy Creek Lundfiil s i t e (Se'i 7u':'.= »?, ur.c: ;n cv.; r.i.qe of :.?7 .'•'" f!rws

towards tc the A r t e s i a n w e l l f'le'.ds ir. £;:Jiticn tc tr.i '.,51 .•''" c: :':.i- rc-ccvery

Purpace at Artesian we 1 1 f i e l d s , which ar» locatoc aprroxirate'.y 3,000

feet south of Array Creek L a n d f i l l , was inert,- :ud f.-cr. ar, average of 1.7 MGD in

IS/'; to an average o: 3.5 .vcri ir. 1973, with p ;-. wi thur.r..-i'.£ c: 5.2 !:;".Kecivntly the pumpage rnf- has heer. about I.C MGD (Kef, 10). This value- is veryclose to the- c a l c u l a t e d rec'narve by the h y d r c l c f i c :r.as;- balance r-zth^c. In

other words, by increasing the rate of the recovery punpage, the yield of theArtesian well field will decrease.

In 1973 lenchate recovery wells were installed along the southern bankof Arr.y Creek. These recovery v e i l s served several purposes (Kef. 9):

o To control the groundwater gradient and prevent contaminants froir,

n>i L'rat inr- towards the- K.iior we 1'. f i e l d s ,

/5rJ..'I /i - ,"

Hydrologi: Survey of Ar:ry Cn-cV. LandfillTDD No. F3-610S-J1B-.:.- Nc. HE-IT and

Mcvonen: of Ccnla-ir.aniE

o extract certs;:: r.aTlsi water frci;1. the aquifer lor treason:; tre,it;r.«r.t,

The i r F t f i l ! at ior. s: '.he- recovery wcl IS-::SBC the r ^ n i t c r i n g re'.vcr'K hascost SI. 25 ir.i:!:cr. irvei. - / . 7re rc-ccvery wtl'.s v.-i t'ndrawirg !..r> MGT ^verafeflew (Rtf. 11) are cirrhsrj-ed d i r e c t l y to Arry Creek. Recently, NOW CastleCounty conducted a f e s s i b i l i t y rtudy fPcf. 11) to irstnl! c conveyancef a c i l i t y , trar.sr.itJir.g the rcccvery vsl! f'.:vs to the Sra'o F:sd «•?'.•£ re l i f tstation where the a v s i l a b l e carscity is estimated to be o n l y . 1.27 MGS.

In the north firt of tno Delaware Sand and Gravel s i t e , a pit of 150' x70' x 15' was f i l l e d with druirs of cher.ica! l i q u i d . This area o v e r l i e s a sandand grave! deposit w i t h i n a <!: rccr.t inui ty of the cl.v.' layer ir the Cc!u™HaFormation (See Fig. 2\ c,r.c is ci;:tc pc-;^!c ; : the ir::l:rsticr ofcontaminants into the acuifer.

AIT-OCO Well P'n'-3 is located about 2,000 feet' southeast of the DelavareSand and Crave! Site. The rate of withdvawal was i to 6 MCD for p.snufacturinpand domestic uses. Shut down of this well due to contamination was necessaryin 1975. Recently, Anoco Veil PW-2 has been operated intermittently forgeneral purpose uses.

The a n a l y t i c a l r e s u l t s of inorganics of s.".3iplirE or Kovc:..'.er 9-11, 19E1are prc'fi-r.ted in Tat'.es 5 and (• , The findings arc- f '.irrar:'s-.: at fcllrws:

5.2

A Kydrolopic Survey of Army Creek L a n d f i l lTED*No. F3-81CS-!1?EP.A No. DE-17 andDelaware Sand and Gravel :..•"-.:•:!!

ErA No. D£-C;yo'.c-er: of C;r:r-;-;:-:r

o I: decs not Enow si^r.i 1 l e a n t inorganic p r i o r i t y pc'.Ktants in thaArtcsicn water r-up!y w e l l s , except 0.2 ppr of lead in AWC 2.

o H i g h e r cencentr.it::- of iror. (!<."': ppn), -;:"^-,-o Ij.i p p r 1 cnc lt;,3CO.?* ;•:.".' is fc::r..; ::-, ::,,: caiUrr. a-.d •..-"Et^r" p.?r::'t>ns of ATTV Crr?!'.Landfill S'icc;. Zinc (.5.6 ppin) was a'.Ec foiaid on eastiirn portion.

o Hiphc-r ccr.: = r.:ra: icn :: .-•I'jrinur: C215 jp-1, cadiurr (C.CO pp-r.!,chromiim (O.I ppir'1, iron US- ppsi), ir.scr.iisiiiir. 12.C p?".l, ana srtc-nit.(0,05 pp:r) were ::;::-.; ;-.tar l;.e r,cr:heii:err, portion of Selcware Sa.'.c andGrove!.

c Concentration of hiivy re'.a'.s ircrc,-.Eed in We'.! ''39 ir.dica'.irg thatDelaware Sand and Cr.v.'e', L.'ii'dfill Pr.v have ^ocenl 1.1! ly ccr.tri-uttd tothe increase of the ccnta^inants.

o In Army Creek, the ccr.centr.-.tior, cf iron, cadrix;^, ch.rori'.:"., lend,copper, nickel, line and silver is over the maximum value for protectionof freshwater acuatic l i f e , Therefore, the- water body is threatened bythe incrfEnic pel 1'jtarts.

o A comparison of the ana l y t i c a l results shows:

Iron Manp.irese(;T::' (nrh) Rc-rsrks

Well frSl 1979 100,000 420 Iron concentration declined(Refuse) 196! 87,600 450 about C per year.Well W: 1979 35,000 2 ,'600 Concentration varies with(Recovery) 1961 21,300 1,220 purpajc.AWC 2 1973 240 - Concentration decreases(Artesian 1979 120 - steadily.production 1961 40 <10well)Pi\'2 !??j 40 - Cr.ncentrat ijn increases due(Airoco 19'9 to riraioapp incrtnsinp.production H'Sl 260 10we 11 /

Ariny 1973 c,"00 3?0 Cor.:r:r.r rat ior.r increaseCreek 1961 25,000 fijO s i g n i f i c a n t l y due to

discharge fris. recovery wells'".-.1

A Hydrolopic Survey of Arny Creek LandfillTDD'NO. F3-Bio8-niiEPA No, DE-17 arc!Delewarc £and an: :r;v.?l L a n d f i l l7n~ N\" . fT-*]??-'''"tt.\ No, :•£-?•Mover.er.t cf Contar.ir.ur.'. ?

o Til: iT! leva's at the recovery wells has dropped s i g n i f i c a n t l y (See?if. I-','1 •-;•::;•. ; r.d:' cares that orcanic de:LT.rc: i ti cr. cf the londfil'.is .i.'.»i.::".!. duj t* ; •--; :!:•.'. or t!i lut i:r., cr a d^pl?*. ::r *' thecrjar.i-.1 :>:: : = ::•:-? re1----::-: r-g on E i r o .

o The CC'" level cf the Etrear flow ir. Arny Creek is jM-rc-rally low

o Fig. 16 shcv« the CVA readings at the we!! heads performed onNovember 9-11, !981. High readings were observed on Arr.y CreekL a n d f i l l , which i n d i c a t e thn: nvrthsr.e and ether v c l a t i i e or::;r.i:gases art- present in e:-:p'.csi'.'e ccr.cent raticr.r abcve several we!!heac's,

From labcratory analyses cf November 196!'s sam p l i n g , a .-.ur.-ary of majorcrgar.ie pill u t i r . t f f;-_rc i; sr.cvn en Tables 7 and 3. It fcur.d:

o The analyses cf 11.'SI s a r p l e s did net show a q u a n t i t a t i v e - result fororganic priority pollutants, but did identify the presence ofv o l a t i l e ant! extrsctnble compounds, except the haicfenatedhydrocarbons.

o Several polynuclear aror.atic hydrocarbons (FA!0 were found in thein cht sedinent samples, This substantiates the point thatadsorption of crpnnic molecules in the water/sediment and water/soilr;iitem is recopr.zod as one important factor to be considered indc-tenrir.inc in-p cts upon the envi ronr.ent ,

o The nur.pir.c of vale:- frorr. the recovery u^-ll? i r t c Ar:-y Creek r.ay

5.'.

Ar~i '- r-, -". -• r ru 0 U J / j j

Aft,

A Hydrolocic Survey of Army Creek -andiillTDD No'. F3-810B-11E

EPA No. DE-17and

Dvlswaro Font! ,ind Crave] L n n d f i i ;

!•:• •r:-y>T>.r-T:CN FOR FfSTi'E- iiiViSTic/-";:;

located on the r.cr::>.- r:, part of ti.c prefer:;.1 ar.d would be a I" holed r i l l e d about If feet V:-'.cw grade. '-TTT* purpose of this borehole istc £:::•'.!• the foi°; a: 5 feet interval3 for analysi; of ".hiconstituents, especially the contents of organic priority pollutants.Tliis hole- will be f i l l e d with clay after completing the test.

o Proposed borehole "" is located a few feet adjacent tc the proposedborehole "1, out f i d ? of the waste pi: area, r.va:'..':'. e :.r. :';rr.at:cnshows t h a t the pit l i e s on the ssrd i,r.c gravel d t n o s i t E , a: the

discont inuat icn of the clay layer in the Columbia Fcrrst ic:-.. This 4"hole wi l l penetrd'c- cpproxirately 4C feet throuch the ColumbiaFcr-uticr. sr..! th-: v-t'.r t:blo '.:- c?nfirr> th: i-eclicica! festure(discontinuity) and tbe iripration of the centr.minants. This borehole

w i l l bt ccfed wit'1 a ?'. •?<••! ripe for frjundwstcr r.cni t c r i n r .

o Proposed borehole "3 if located in the center of the refuse area.A 2" hole is proposed to 20 foot depth in order to identify theconstituents of the refuse. This hole will be filled with clay after

completing the test. .,

o Borehole /(A is to redrill well <>53 located on the southwestern part

of the property. TH F e x i s t inc well is now dr>. The- well w i l l be

r e d r i l l e d to ICO fi-r-t deep, r. 'chit'.f the ji-ri i.iytr :';;• - c v i t rnr.g

A R 3 0 L 71

A Hydro! of ic Survey of Arir.y Creek LandfillTDD Mo. F?-eiOS-llEEPA No. DE-17 andDelaware S.-rd and Grcvs! Lsr-rf: : !

Feccr.rcr:::i:T. for

the p;:'r. of cortir:nu!.:c:i :c ,irocc we! it.

c Borehole «5 is to redri!! well CV: K-cat»d or. the rcrchsasterr.of the properiy, iiiufcn: to tnc railrc.vc. :rf.:K. ir.is e x i s i i n g

•.-,•:! IE cr.:V...-d v::r v,-.^-i- ;r:i s-r.::-.;. :ne v.;!! v: 1 1 :••; r'.-.^ri: :«d toi':c'.:: UC f*it ditp :;r rcr:::r:n^ :!,o Lprr::1!:-: v;: = r :•..;:;:;.• ::the s i r e .

In order tc cusr.tify :^e c;r:;rt rat : cr. .::" :h; pr;:.:; ::, sr. .--.dJ: : :':nalresampling is Euc-estsd. This ss-plin; v?'j'.r! inel'.'de sr anat;'r:5 cf ^r7:-iccompounds only,

r( .". A p. -i iA o J u / >

A HydrolojMC Survey of Army Creek L a n d f i l lT^D No. F3-E1C8-11H

E?A No. DE-17and

!\;.iwure Earn! ard Crav»! Lam! fi :'.TrD No . Fj-tlGS-i1:?

EP.i Nc. DE-01

ATTnCiiXENTS

A, Altechc-d Tablof

Table' 1 Ir.viT,lory o: existinj: wells or, :!ie :-.m cf ArryCreek t;:i Delaware Sar.J a^d G re •••:'. '.ar,.J.f i!'. s.

Table 2 Fstiration of infiltration by hydrolcgic budget.

Table 3 Ef t iir..ition of upfradient: recharge.

T.ble 5

Water budget calculation for the study area.

Table 5 Summary of inorganics analyses data, Sir.pleJ onNovember 9-11, 1981.

Table 6 Summary of inorganic analyses data, sc-dircent sar,p!udon November 9-11, 196'. .

Table 7 Sucmary of organic analyses dat on November 9-11,198! .

7,1

A Hydrolopic Survey of Army Creek LandfillTDD No'. F3-B1C6-11E

EPA I.'?. DE-17and

r.;:.-.w.-.r; fare! .-.r.:! Crave! Lard:: 11

?.. Attached

ETA >. r,:-ei

ATTACHUI:::TE

Fij'jrt 1 Site fei'.jrss rap of Llangcller. Undfi'.l snd PelawareS.-n.J ar.d Crave! Landfill.

Figure 2 "yrlr.-^eelcgica! Ei-ctiir A-A'.

Figure A Hyd;ro^eclogical sections'C-C' and E-D'.

Figure 5 Ground*,:: er elevation contour ir.ar- of September 1972.

Figure 7 Cr.-'.i-iwatt-;- el'V.'c: :o:- c •: r,: o <.: r r;r of Varci: 1976.

Figure 8 Groundwatcr elevation contour sap of July 1977.

Figure 1 Groundwater elevation contour r;ap of 1976.

Figure 1C Grcundwfiter e l e v a t i c r contour nap c: February 1961.

Figure 1! Groundvnter elevation contour map of November 19B1 .

Figure 12 K>- lat i cr.fhip prap'r. between pumpace and influencedistance.

Figure 13 Kydrologic nac.s balance in Amy CreeV. L a n d f i l l andDelaware Sand and Gra.'.'l sites.

Figure K Iron concentration of groundwater sampling onNoverber 1981.

Figure 15 CCLi l e v e l , of ground'. ,iter f,:rplir.g on Sovorber 19C1 .

Figure 16 OVA readings at well ht.-asE ard lir"? of ocua! methaneconcentrat i on.

Figure- 17 Location irap of the profcfed Svrei.c ICE .

7.2

A Fi 3 01171; 5

f> Hydrologic Survey of Army CreekTDD No. F3-810S-11B

EFA No. Dt-17and

D'l-if.w.ire Sard ana Grave! LandfillTPP ',::, rJ-clCE-1 si'

ATTACHMENTS

C. List of ncfcrcRCcs (',',?: ir.:!::ded in this rep:r:?

r e a c t i o n - ; st !=••.•'';!!, C:vjn- '..Vtsr, '>!. 17, (.',5, 5, S?-?tt!r:ner-?cr.cber

2. CAhE A* sc: ; a 1 1::; , inc., f.stc? .-Jir.cr.i t: i.;.u pi" i:::-;. ...•.- ~. ^. ;...,•.-... .. _ . _ .cor.pcunss in Psiuware's sources of water supply, Prepared forDeportment of .'.'acuriil F!vscurcc£ a;-,; Er.v: rcr.rer.tal C.:'-:ro!, r^ '. :wars ,

3. David C. Ciari; et ai, Rer.ecial action activities for Arsy Croe'i;Landfill, Proceedings 5ch National Solid and Kujardous '/.-.see ConferenceL'SErA, Cincinnati, Chio, 1979.

4. Fcppo 5. DeWalle ot si, Detection of trtce orcsnics in ue'.'t va:er reara solid waste landfill, Journal AVVA, April !?5!,

5. Ecology and Environment, Inc., Prelir.incry AssesEr.en: of De1.;'..-2re Sandand Gravel Landfill, New Castle, Delaware, September 19E1.

6. Ecology and Er.vironrent , Inc., A Site Inspociion of Lisr^o'i k-r. Landfilland D'il.r-.-re Sard ar.d Grave-'. Lar.dfil], Ntver-.bcr , 19?!,

7. Bangalore T, Lakchran, Aquifer contamination, 25th Annual ,k;co:ir.gAmerican Water WorV.r AFJ cciotion, Sepcor-bcr 1973,

S, Walter X. Leif e: al. Control prccrar fcr !? senate affecting a m u l t i p l eaouifer system, Ar .y Creek La n d f i l l , New Castle County, Delaware,Proceedings of the National Conference on Disposal of Stfidues on Land,September 1976.

9. William J. M i l l e r and Lyle K. Silka, Application of computer modelingfor the investigation of groundwater contiitr.inat ion, 4th Annual MadisonConference of Applied Research and Practice on Municipal and IndustrialWaste, September 1981, pp. 3M-3B2.

10. New Castle County, The relation of solic waste di s p o s a l t: waterQ u a l i t y , Areawid'.1 Waste Trcatrent y.&r.z reracn; Prcgrar,, AUTJE" 1975.

11 . Rcy F. We- s tor., In:,, F '.-.-? ibi 1 i iy sinc'y fcr ;hf- d!f;'r.,-rr'= c •:"cent ami nated firoundwater from Army Creek Landfill recovery 'Bi-ils,New Castle County, Tc l n v a r - , £tp:i:"!;or ll'hC,

7.3

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