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; 21'September 2000 _ - - AGE NC Project Na. 97=0360 Page 2 of 8 -Statron,t Inc. Product line f s);were.also removed;during excavation,of he-UST. The:approximate-, _ iocatlori of the forme -UST is shown on Figure 2: { Dtumg the UST removal, two soil samples,were collected from'the floor oftfie UST excavation,- �( four-soil samples from=the°stockpiled soil, arid.one. ab ound-wa r + .gr_- =gr to sample. Total petroleum _ l �- - IiydrocarEions'quantif ed as diesel (TRH-d) was"reported in-each.of the soil samples analyzed At. conceritrations as high as 6"200 7miIli ams er.-kilo a�n m p gx n (_ g/kg). BTEX compounds were not,.. de'tected_in.the:soil`sarinples,anal� `ed': TPH-d:arid•_BTEX:-com - _ - Yz. pounds were detected.in the grab -. ground water sample'at concentrations_:of 31,000 micrograms .per Iiter'{µg/l) TM'-d,,38 g/l r benzene; 12:µg/I'toluene, 53;µg/I ethylbenzene .arid 68:}ig/l xyiene5 Analytical results of soil and ground.water samples are s - _ ummarized iii=Table`1': 23:. : PREVIOUS SUBSURFACE:INVESTIGAT-ION r - On 25 October zn'd=24 November i 999.,Lush Geosciences, Tp6 excavated trenches TR-1.through ,.. - -TR-�9=to maximurzi depths ofapproximately 10_to.12 feet below surface-grade{bsg).to a"ssess the sail " L.. -and groundwater condition-'s-at the a site adj 6i*to J.B.Murphy.Tnicking. The.trenches were=located. . - in close proximity to..the former UST location-on the.property. :of J B': Murphy Truckusg:.- Soil' :F r - samples were.collected from,depths of 8 feet'arid-10"feet bsg;and"ground water was collected from depths of 9-.and l.0jeet�bsg:.TPII-d was detected izi 'soil'samliles collected.froin trenches TR-1 " r. - r . r lhroilgh TR 4 at concentrations as high as 2,1:40 mg/kg. T H-d was also reprted in.the grab ground 3 _ water-sample collected at a.concentration df 508`mg/1'.Only low to,no' detectable concentrations of BTEX.compou_ nds-were detected. 2 4; REGIONAL-GEOLO_GIC SETTING The site is located within the-northern San Joaquin Valley which coiiipnses part of the Great Valley , 7 :_geomorphic province of California: The Saz Joaquin Valley is-forriied :by' the Great Valley - cosy cline which is alar' a-elori ate'.Tnorthwest-trendm asymmetrical structural trough(basin); .�: . Itis bordered by;the Coast Ranges-to the west,.the;Klaniath Mountains=and.Cascade Range to the . north, and the Sierra Nevada-to the-east:;This trough=has been filled'with sediments derivedfrom•' - a ' .-both.marine and continenntal-sources .Thickness'of the-sedimentary-filt ranges frorri-tluri veneers __ along the valley edges to more,than 20;000feet in the "south central -portion -of the valley. The a r : sedimentary formations grange in age with the of"der deposits being primarily rzlarine in origin and the de� okts bein riinanl-Y continental: Continental-derived 'sediments were riznanl younger,. p g':p : p Y ` deposited in lacustrine,fluvial,and alluvial erlviromn' rits with sediment.sources being the:nriountaln f µ ranges surrounding thervalley{Olmsted and Davis, 1961) The site is located,bri.unconsolidated and semi_consolidated alluvium,lake;playa and terrace deposits of Quaternary'age.fCalifornia Divisi6n --- -Advanced Geu>;nvironmental,Inc.. _