272-2177 Tfully .Ubmitted: ~" Thompson

) 151991 '- * SUBSURFACE \ RELIMINARY ASSESSMENc^SSMENTT ERA PROJECT 190043 Prepared For LEHMAN SUNOCO B* EARTH RESOURCE ASSOCIA* 335 South Eighth Street Lebanon, Pennsylvania 1.. (717) 272-2177 tfully .ubmitted: Respec ~" Thompso8 P n* * Geologist 0043.RPT fage rfl INTRODUCTION In respons n Octobea , 199o t e17 r 0 lette re Pennsylvani th fro f o m a Department of Environmental Resources (DER) an assessment of hydrocarbon contamination associated with leakag unleadef eo d gasoline fro a formem r underground storage tank (UST thein )o r propertn i y Lehman, Pennsylvania, Lehman Sunoco contracted Earth Resource Associates, Inc. (ERA). The following report has been prepared by ERA n behalo , f Lehmao f n Sunoco o present , l findinge al t th f o s required assessment. Specifically addressed by the report are: o Background information including site locatiod an n setting; soils; geology; hydrogeology; circumstances concernin e discoverth ge th f o y leaking UST; and, a review of available information concerning a prior hydrocarbon release at a former gasoline station located on an adjacent property. o Procedures use instalo t d networa l eighf k) ^p (8 t shallow gr,QUndwate.fvi^monJ.ô^jing^ôints 4#*° *A« unconsolj_dated 'aqtjife d procedurean r s useo t d collect groundwater samples from these points. o Procedures used to collect groundwater samples from the existing, on-site leak detection monitoring wells whic beed hha n previously installe Lehman di n both the old UST field and the new UST field* EARTH RESOURCE ASSOCIATES, INC, HRI00002 )43,RPT Procedures use colleco dt t groundwater samples from Lehman Sunoco 's on -site bedrock drinking vater suppl frod yan m fj^yJs.^(S) "nearby bedrock domestic: drinking water supply wells. o Procedures use colleco t d surfacta e water sample fro a smalm l pond located east-southease th f o t ^ Sunoco Station. o Analytical resultl surfacal groundwated f o san e r samples collected. ' SITE LOCATION AND SETTING -*, I'Lehman Sunoco operates a gasoline service station and garage on an .{approximately i-acre site, alon soute gth h sid Statf eo en i Rout 8 e11 * .. ' ... rthe Tow f Lehmanno , Lehman Township, Luzerne County, Pennsylvania - • » -" * H> properte $ (FigurTh . situates 1) ei y "thet da " head "6"f *smala l northeast '•OilSâa^trending valley, which vas artificially backfilled prior to i^ - , u constructio statioe th f 1959n o ni . Becaus topographie th f eo c relief of the area, the fill area drops off quickly in the form of steep embankment n botso e eas th ht 'and sout he stationsideth f o s , before merging wit naturale hth , gentl moderatelyo yt , eastward sloping land surface. Elevations range from approximately 1,300 feet above mean sea level (AMSL) in the vicinity of the station to approximately 1,275 EARTH RESOURCE' ASSOCIATES, INC. G R0000I 3 043.RPT Page #4 ;et AMSL in the vicinity of the small pond and wetland area located ,. >proximately 500 feet east of the station. Surface Drainage 3 the site is situated immediately eaat-of- a .majorrregiohalâurface" ater drainage. divJLde_i surface drainage from the property is in an easterl nortlieastlo t y y direction, with most flow dischargina o gt ;etland area and snail pond. This wetland area forms the headwaters of in unnamed tributary to The Huntsville Reservoir. Flow from the reservoir is southeast to Huntsville Creek, which flows into Toby Creek» which in. turn flows into the Susquehanna River just south of Kingston, PA. 0 Cultural Setting The Lehman Sunoco site is situated in a rural- village setting, with much of the surrounding area consisting of farmland, open undeveloped [land, forested land, private residences , and small commercial J facilities. To the North, the site is bordered by several small 1 commercial and residential properties, one of which used to be a Sinclair- gasoline service station; to the East, the isiteîa bordered ,-• ^t-t* ...-..-..-. 'primaril undevelopey yb d scrub-shrub fores wetlandsd tan Wese th t , o ;t 7 the site is bordered by residential properties; . and to the South, by 7 open grass covered fields* residential properties, and forested land. i .. f - 5 . T I 5 - , ft EARTH RESOURCEI ASSOCIATESn 0 0 n I O ,» INC. )43.RPT Procedures use colleco dt t tfroundvater samples from V Lehman Sunoc s oon-sit' e bedrock drinking water suppl frod yan m JfiX£,.f,5J "nearby T bedrock\domcstic: drinking water supply wells. o Procedures use colleco t d a surfact e water sample fro snaia m l pond located east-southease th f o t Sunoc' o Station. o Analytical resultl surfacal d £roundwatef o san e r samples collected. SITE LOCATIO D SETTINNAN L G t - '. - • - • : • i••Lehma: n Sunoco operates a gasoline service station and garage on an japproximately |-acre site, along the south side of State Route 118 in fthI e Town of Lehman, Lehman Township, Luzerne County, Pennsylvania ) (Figure 1). The property is situated at the" head "o'f"a. small northeast " ' ' •-••:- valley, which was artificially backfilled prior to 'constructio statioe th f n1959o n n i * Becaus topographie th f eo c relief . : •'"•'•• - : -•I ' of the area, the fill area drops off quickly in the form of steep embankments on both the east and south sides of the station, before merging wit naturale hth , gentl o moderatelyt y , eastward sloping land surface. Elevations range fromâpproximately 1,300 feet above mean sea level (AMSL) in the vicinity'of the station to approximately 1,275 EARTH RESOURCE'ASSOCIATES! INC. RRI 00005 90043.RPT Pag5 #1 e the earth's surface. The matrix material containing the coarse rock fragments usually ranges from clayey to sandy; however, overall textur dependens i e t upopercentage nth coarsf eo e fragmentsa s a d ,an result n rangca i e from claye o stonyt y n thiI .s portio f Luzerno n e County equal amounts of clay, silt, and sand normally comprise the matrix* The color of Olean till is strongly dependent on local bedroc rangn k ca typ ed ean fro m yellowis h5/6R Y brow reddiso )0 t (1 n h R 4/4)browY 5 .( n Lateral differences base n coloro d , matrix composition, and pebble content are also common (Growl and Sevon, r 1980). In additio tilo t n l deposits, other type unconsolidatef so d sediments whicaree exisy th ahma n i tinclud e various sand, mixture gravelf so , pts*t, clad alluviayan l deposits. Bedrock Geology Bedrock underlying the Lehman Sunoco site has been mapped by the f Pennsylvania Topographi d Geologian c c Surve * the^Deyorii'aa y n aged c*,*iyAL^.Fprmation (Figure 3) (Hollowell and Koester, 1975) * The Catskill Formatio complea s ni x unit consistin darf go k grayiso t d hre reddish brown shale, claystone siltstoned ,an ; greenish gradard yan k grayish red, fine to medium "grained sandstone; and yellowish to . •*-*•.•*•"*•••«••———..- ". ———^•^.__———«.- - • - •• **..!. I greenish gray* medium to coarse grained sandstone and conglomerate. it. ? Small amounts of grayish brown calcareous conglomerate and greenish gray conglomeritic mudston n alsca eo occur. Siltstone predominates within the lower portion of the Catskill clastic suite and quartz is tne predominant minera thin i l s formation e rocTh k. colo d graian r n EARTH RESOURCE ASSOCIATES, INC. ARIQ0006 lunlley Mtn. Formotion BBS i•JTTP^^f?^^ * ' ' *- «™KIKKK " Formation BS — LEHMAN SUKOCO Hydrocarbon Contamination Assessment *• L<hmon. R Mapping R.productd Fron Tht ^yc^ PrtUnlnary Gfologic Quadranpif PtnnsyUan.f -o » Harv.y'a- _ _ 5 Lak. Quad __ ::__-i 1 Isiik [SCAL -"-i E1 - RRI00007 90043.RP . T Pag7 #1 e size alternate frequentl a typica n i y l e sectioCatakilth d an s ni l believed to be approximately 8,000 feet thick. Both the thickness and the abundance of red beds decrease in a westward direction (Hollowell and Koester, 1975)* Sedimentary features common in the sandstone and conglomerate units include crossbedding, channeling, and cut and fill features, with fossils also common. The shale portion of the Catskill Formation disintegrates rapidly when exposed to moisture, weathering to small, platy, triangular fragments; while the sandstone, siltstone, and conglomerate units are moderately resistant to weathering and weather to medium and large-sized blocks* The mantle created by weathering is thickes n glaciatei t df variablo area d an s e thickness elsewhere. Surface drainage is moderate to good for unglaciated portions of the Catskill and poor in glaciated regions (Geyer and Wilshusen, 1982). Bedding in the Catskill Formation is generally non-distinct in the shale, claystone, and siltstone units, but is well developed in the sandston conglomeratd ean e units. Bedding thickness ranges from less than one foot in the finer-grained units to between 10 and 16 feet in the coarser-grained units. Bedrock Structure • * The trend"(strike) of bedr.ock in-this. region generally ranges between N.40'E. and N.50*E. and the (inclination) dip of these bedrock units range s degree5 e 2 southeasbetwee th d o an t s 1 nnorthwestr to e .Th . -ike of the bedrock was measured by ERA on an outcrop adjacent to the site and found to range from N;.39aE..; to^N.SS'E; The dip of the EARTH RESOURCE ASSOCIATES, INC. ARIQQQQfl 90043 T .RP Pag8 #1 e • • " rocd _i k expose y thib d s outcro s e shallowfounb pwa o t d , ranging from 9* to 12* to the northwest. Based on these measurements, it appears as e situate b e northwes e sity th ith f ma e n o d t flana smal f o kl anticlinal form. ' , ; . Rupture deformation has produced joints, faults, and certain types of cleavage in all rock units of the Catskill Formation; however, joints are the most common type of fracture observed in this formation.

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