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<br /> � ;' 244-West'Hardin Wa , Stockton;California tn�,.' f �•R ', +li ,Y 11 }t,; " ''' ,
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<br /> rll.•I , ^,I The szte'is.bounded onthe north by Harding Way,with resldenhal properties'orl the south and-west
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<br /> J I and,commercial properties'on'the east. A single'structure;utilized as a gasoline,station and'min>< r ray
<br /> mart; occupies the'southein 1portioin of the site: Two underground .storage tanks (USts}
<br /> .'., removed'from•the site in Septeriiber,l'99$by'Stockton�Service Station Equipment(SSSE)'and'anew I' _
<br /> � UST system was installed in December 1998.
<br /> -i;.,REGIONAL'GEOLOGICIHYDROGEOLOGIC CONDI TIONS
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<br /> The 'site'is situated within the Great Valley Geomorphic Province of California; a large, elongate
<br /> „•• �', `'northwest-trending;'`asymmetric structural trough.,The Great Valley Province has been'filled withr'
<br /> thick;sequerlces of.sedirnent ranging iri age.from Jurassic to'Recent,'creating,a nearly flat-lying' ' ^
<br /> ,'alluvial plain,which extends from the Tehachapi Mountains in the,south to the Klamath'Mountains : ".
<br /> in the north The western and eastern boundaries.of this province are comprised of the-California
<br /> CoastRange and the Sierra Nevada,'respectively., Rocks composing.the basement complex of the
<br /> province have not been completely defined.but are believed to be of metamorphic-and igneous.''
<br /> ..origin.The Great Valley Province has been subdivided into two major divisions, identified as the
<br /> ' Sacramento and San Joaquin Valleys. ;
<br /> The Modesto, Riverbank; and Turlock Lake Formations and overlying Recent alluvium`are the .
<br /> principal sources of domestic ground water in the 13;500-square mile San•Joaquin Valley Ground.
<br /> Water:Basin (Basin 6-22). This basin is,drained primarily by the San Joaquin River.'The closest
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<br /> r 'surface water featuie'at the site is Smith Canal and Yosemite Lake,located approxiinately'1,500:feet
<br /> northwest of the:site. Water from Smith Canal drains into the San-Joaquin River'DeepWater"'. I}
<br /> r .'r Anel and is rimaril .'used for commercial and-recreational boatin
<br /> Cha p y g
<br /> F I i ' ,; ,PREVIOUS INVESTIGATIONS '
<br /> '. '4 i ` , ' J ,... al srte,'assessment .,
<br /> Itis Advanced GeoEnvironmental Inc. AGE s understanding that environment
<br /> was performed on the property 'in early. 19,9,6. Field observations indicated that:petroleum
<br /> ' hydrocarbons may have impacted the soil. 0 'e.;soil sample collected from 40 feet below surface} ;
<br /> grade (bsg)had detectable concentrations of petroleum hydrocarbons. Two ground water,samples.
<br /> `had low concentrations of volatile,aromatic compounds;one of the ground water samples'Collected '
<br /> ' a .`'•arid analyzed contained ,total• petroleum hydrocarbons, quantified as gasoline (TPH-g) 'at a
<br /> r ;concentration of 0.28 milligrams per liter(mg/1).'Methyl'tertiary-butyl ether(MTBE)•was detected
<br /> micrograms per liter(µg/1)• #
<br /> Advanced GcoEnvironmenfal Inc.
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