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. .• E' ,til �i 1: ` S ' ' Z � z 1 i
<br /> �. 04 Decernber,2001
<br /> AGE:NC Project No
<br /> 01-0828 ,
<br />' Page 2 of 5'
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<br /> excavatlort`Laboratory' arialysls of,the three, samples• deiected concentratioris of total 'volatile' {
<br /> a r •
<br /> petrol h drocarbons at.conce'ntrations'ran from glkgio 130 zngCkg. : ;
<br /> P_ Yg
<br /> In 1992 a UAR was filed-with-the PHS EHD for one 2,000 gallon and'one
<br /> 506-gallon,(Tank`No l
<br /> and Tank No.,2, respectively) former-gasoline USTs.=Soil samples:collected,from beneath Tank s.-
<br /> Nos:�1, aiid-2 did not contain detectable concentrations of petroleu,Mlhydrocarbons.';On�1.7,May-1990'-
<br /> one 500 anon v�raste oil UST Tank Na. '3 was removed,and ones le.was collected from the
<br /> g ( ) •, amP
<br />' tank excavation: Analytical results of the soil.sairi le were not rovided'to the PHS-EHD:-Analytical
<br /> p p
<br /> results from previous investigations'are'surnmar;zed in Table'1.
<br /> 2.3.' REGIONAL GEOL•OGIC'SETTING '
<br />- '.The:propertyis .situated Within' the 'Great Valley'Geb' rphic-Province of California,, 'a, large,:
<br /> :.elongate,'northwest'.trending, ,asyrimietric striictural.trough. The Great Valley Province has..been
<br />' 'filled with thick se uences of sediment ran in age from Jurassic.to Recent,.creatin a nearl flat-s
<br /> q Wig,. g g Y
<br /> %lying alluvial plain, extending from the Tehachapi Mountains-in-the south to the Klarnath Mountains
<br /> in the north. The western and easter boundaries of-this"province are comprised of,the California .
<br /> to Coast Range and-the Sierra Nevada, respectively: Rocks composing,the,basement'd omplex of the,
<br /> province have"not been completely defined blit-are believed Ito be znetainorphid and igneous in origin.
<br /> °The northern and southern portions of 'the Great`'Valley Province have, been designated the.
<br /> '. Sacramento'and San Joaquin Valleys, respectively:
<br />' 'Based on-the Gezieral Sail-Map-frorr'the'San Joaquin County Soal Survey, published'by the United
<br /> States,Department of Agriculture Soil Conservatign Service In 1992, the site area within the ;
<br /> Jackson-Hallenbeck-Stockton (JHS) association.:.The JHS -soils are,located Withini,basins, and
<br /> generally consist'of moderate-to poorly dralned'fine textured soils.-The soils''aregenerally derived
<br /> 11'from,,both.manne,and non-marinesediment,;.and,are.generally,forriied'in alluviurh'derived,from:
<br /> mi
<br /> xe6 ocklsources. Y, .
<br /> The Made§to;Riverbank,:Turlock''Lake-Forrhations:a�.d.overlying receiit alluvium are the-principal.-•
<br /> sources ofdomestic`ground Water in the 13,5007sgilare-mile Sari Joaquin Valldy Ground Water Basin ; A.
<br /> ' {Basin 5-22) This-basin'is drained prilriarily,-by-the San Joaquin River:'The'nearest surface water
<br /> feature•in.the.vicinity of the property is the Stockton Divertuig Canal,appraxirriaiely 3;000 feet north
<br /> of the property. <
<br />' AdvaE
<br /> nced Geonvironmental,Inc.
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