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29 November 2001 i z r j x r AGE=NC Project No:'O1 0887 Page- 2 of 6 'collected during the UST and pip ingt removal-detected,volatile"aromatic compounds benzene, "= 4 toluene, ethylbenzene and total xylenes-at concentrations.as•high as 0.026-milligrams per kilogram (mg/kg).�0.007 mg/kg-,-0.009 mg/kg and_0:01 mg/kg, respectively.'Total petroleuiii hydrocarbons quantified`as'gasoline (TPH=g) and BTEX were detected at concentrations of as high hs 8:3--mg/kg.a: i and '15.9 rXi res ectiyel in soil `sam les collected 7from below s the roduct' i m ` Wig; ' P Y, P p_ p p g (approximately.4 feet b'sg) ::Analyiical.results;of soil.�sarnples collected during removal of the USTs are summarized in,Table L.- .. - .. _ Y � .Ga ''if 'r ..`. _ .� •7 �•i � , Ste. 2.3. REGIONAL GEOLOGIC SETTING y .f. x. . * c ' �a '� .r', �'� �3 � •(ham s ,+a, • ",s 5..:'. The property is situated within. the��Great Valley-Geomorphic:Province.of California,-,a':large, `r belongate, northwest trending, asYmetric"structural'trou TeGreatValJe Provmce,haseen:`-1 filled with thick sequences of sediment ranging in age from Jirassrc to Recent;creating a nearly flat- tying alluvial plain,extending frorn-theTehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised-;of the Califorma r . Coast Range and the Sierra Nevada, respectively:Rocks composing the basemert�complex of the =,province have not been completely defined but Believed to-be metamorphic and igneous in origin `4 The northern,and southern portions of.the`Great Valleys Pr6vinc&have been- designated the ;-r Sacrair_iento and San Joaquin Valleys;respectively`` *, -Based-on the General Soli Map_from the San Joaquin County S_ oil Survey; published ay the United <",Y, : . States Department of Agriculture Soil Conservation`Service_m`1.992,.the site=_area is`wi.thin the k Y '' , ' q Jackson-Hallenbeck-Stockton (JHS). association.:The JHS soils:;are.�.1: ated within,=basins, generally consist.of moderate to.poorly drained-fine textured'soils:The soils are generally derived from .both marine and non-marine sediment, and are generally formed in_ailuvium derived'. ibr " -. mixed rock sources: The Modesto;Riverbank, I unlock Lake Formations and overlying recent alluvium are the principal t Y. ` sources of&mestic groundwaterin the 13;5-00-square-ri3ile San=Joaquin Valley Ground Water Basin.- (Basi ' asin .x. s f •' H h. + (Basin 5;22)',.This basin is.drairied primarily by the;San.Jo4qujn River. The nearest surface water = feature,iri the-vicinity of the property is the Old River,,appr6xilmately.2:5 miles west of the property. 2:4. GROUND WATER•DEPTH-AND FLOW DIRECTION. : ♦ ' <_ - ' - ."5.'. d. - =ice.-=`• -_ - - _ : y. _. Based on zeview.of the Lanes of Equal Depth to Groundwater Fall I999 naap published,by the San"I.---.4, Joaquin County Flood Control District and'WaterConservationDistrict(FCD&WCD),the'estimated°` .t ` depth to groundwater at the site is b_etweeii 5 and.10 feet bsg: `` x .Advanced GeuEdiviranmental,Inc- 7 ., . 'l.-.. '' F.