WORK PLANS - Laserfiche WebLink

Home Browse Search

jrF f 24 July 2000 AGE-NC Project No. 00-0736. - . ' 'Page 2of8' sketches contained in previous reports,the-UST was formerly located'at-tle center ofthe'sife{Figure 2). During the UST removal,soil samples were collected at a depth of eiglif.feei elow-surface grade=- -x' -(bsg)from beneath the east-and west ends of the UST(TI-Eand-,Tl-W;-respectively):!In addition, asoil sample was collected from the soil stockpile associated with-tahk_removal (SP-1):Results of:. _ laboratory analysis of soil samples collected during the investigation indicated no,'im'pact of by total . ,petroleum hydrocarbon as gasoline(TPH-g),benzene,toluene,ethyl-bo zene,=total xylenes(BTEX) r- and 1,2-Dibromoethane(EDB).Analysis of the samples for total leaddetectedconcentrations as high, ,- as 18 mg/kg..A summary of soil analytical results.are presented in;Table'1 - _ b; } r " " 2.3. ', ILLEGAL DISPOSAL OF WASTE On 05'April 1991;-a Notification of Hazardous Waste Discharge.for'the-illegat'dumping of waste oil and solvents.was filed by the PHS-EHD..According to the Notification,"visible contamination" '- was noted around the drain area as well:as a'"dark oily liquid"..The PHS=EHD further.stated that:: ..:`+. additional investigation would be required to determine the "nature_and.extent'of-contamination".-. : , -There was no informE tion.in PHS=EHD files indicating that an investigation of this-area has beeh' performed. - - - . - _ 7 r. _ . - 2.4:. REGIONAL.GEOLOGIC/HYDROGEOLOGIC'-SETTIN.6;" The property is situated within the Great_.Valley Geomoiphic'Province.of California,_.a.large; elongate, northwest trending', asymmetric structural trough. The'Great.Valley'Province-has-.been 1 - ,. filled with thick sequences of sediment ranging in age from Jurassic to Recent;creating a nearly-flat- IJw ,lying alluvial'plain,extending from the Tehachapi Mountains-in.the south_to the Klainaih Mountains in the.north. The western and eastern boundaries of-this province are comprised of the`California Coast Range-and the Sierra Nevada, respectively.:Rocks composing the baseft erit-complex of the province have not been completelydeflned-but are believed to be metamorphic and igneous.in origin:. . r ;i The northern and southern portions 'of the Great Valley Province have`been=designated the } - Sacramento and San Joaquin Valleys, respectively. - ; Based on.the General Soil.Map from the San Joaquin County Soil Survey,-published by the United ' States Department of Agriculture Soil.-Conservation Service in-1992,'ahe.site7area is within the R Jackson-Hallenbeck-Stockton (JHS) association. The JHS soils.-are' located-:within.basins,•and. :r- generally consist-of moderate to poorly drained fine textured soils'. The soils are general'ly•derived.-, V, from both marine and non-marine.sedirrient, and are generally formed in-alluvium:derived.--from 4 mixed rock sources. -Advanced GeoEnvir_anmc6tal,Inc