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l IdMa}'23�996 Page-2- mediately north of the over-ex-cavation Laboratory th of 10 feet bgs detected canopy located im Gasoline e to the building the north sldewall of Pit 1 at a Pto 65,000 Mg/kg of structural damage le collected from in from 3,200 49 g analyses of the $p11 same gene in concentrations ranging detection ne and xylene d EDB was detected at a �o�tl�oratory f 5 3 µ toluene, ethyl benne 400 ingl,cg ' reported s No evidence of of 1, detected at or above ilia rep was detected at a concentration Inataon was feet bg 4 5 bgs Or hydrocarbon Contain No evidence of hY acted from the floor of the over-excavation at 1 oll le collected from the south sidewall. indicated a light limits in the sample c was detected In the same s Field obsery the north sidewall hydrocarbon contamination west sidewalls at 11 feetfeet to l l feet bgs along the east and was present from 17 feet bgs samples collected from ra niotthng approximate brawn, Indurated Slit with g y petroleum ,1 f Pit 1 The total depth of the oveL-excavatian was aFP the latera} and vertical exte 2 p, pendix A o assess on Figure ' �s were drilled at the site to locations are shown Q to 15 feet bgs Indic no Five angle sol, borinD The soil boring No petroleum the north of pit l les collected from the soil borings detection limits les, cantanlination to oriel laboratory of the soil same Laboratory analyses of the soil sampor above the les During field screening evidence of hydrocarbon consts e sod during the s at dr ll ng Grout was not were noted in ic vapors were detected the seasonal high odors or staining no organ. Meays of the PHS1E�' The soil boring using a photoionigathe detector Ac cording to Ms MAY s 750 cm) on the soft the drilling roximately 2$ feet bgndix A Based up encountered during , Figure 35 APP sidewall of the former on Geologic Cross Section oA rema ning in the north groundwater in the idlewlld area is estimated to e a s sample locations are shore the volume of contaminat ed investigation Information, arils tank pit is estimated to be 1 $ cubic y O SES01L) ration of gasoline 3 p VAD OSE ZONE MODELIN [ pVERVIEW, Seasonal Soil),was used to estimate the mfg uter model,RIS Pgo 5 SESOI SKPRo's SES41L - 1NTF ODUCTIGN AND zone The camp }ewild site (5ee Rl vertical transport code for the unsaturated raare the l major constituents at the Id and chemical property A endix B} SESOIL is a ane"limen sallaproperties,v ed for the U S Environmental Protection. Pp Compartment geometry, develop Little, Climatic data, Wagnerof Arth and SESOII� has is Substances by M Bonazountaaaidge National Laborato o IL allows the soil coin anents used in the SES4IL model SE5Q1L w S p (EPA) 4�ce of Tax GEMS) SE Agency ( System ( ars displaying varying 984 Graphical Exposure Modeling Y sublay a in 1 gevisic�ns were mad to Sp SOIL in 19 layers and ten{10) ate infiltration from orated In the EP'A imum of four {4j ma}or y been incorP hydrologic- routines to estlmchemical component profile to be divided into a max The model contains presents transport of one{ ) acceptance and ease chemical loading concentrations The Madel rep regulatory Pr ertles Due to its wide monthly climatic data and soil P P aSeous,and adsorbed} three (3)phaseS{aqueous g ractical vadose zone models available through is currently one of the most P Of use, SESOIL eor�Qoie ;i.a