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<br /> Site Background Information
<br /> '• WELDON CHURCH PROPERTY
<br /> . 144 West Beverly P1ace,,,Tracy, California
<br /> The site is located in a residential area of central Tracy,California;in San Joaquin County(Figure 1).
<br /> One house'and a detached garage/storage area are currently located on the property,. An apartment
<br /> complex is located'iminediatelywestofthe formerUS,T area;'residences are locatedto the,south and
<br /> east of the site..One small'capacity'(550-gallon)UST was installed at,the,site in the early 1980s. The ?'
<br /> 'tank was used to fuel vehicles"associated with Church Refrigeration,a company owned'and operated . ti
<br /> by.Mr. Weldon Church.
<br /> REGIONAL,GEOLOGIC/HYDROGEOLOGIC SETTING
<br /> The property is situated within'the Great Valley Geomorphic Province of California, a large,
<br /> elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been ,
<br /> filled with thick sequences of sediment ranging in age from Jurassic to Recent;creating a nearly flat-
<br /> lying alluvial plain,extending from the Tehachapi Mountains in the south to the Klamath Mountains., .
<br /> in the north.The western and easternboundaries of this province are-the California Coast Range and
<br /> the Sierra Nevada, respectively. Rocks composing the basement'corriplex of the province have not..
<br /> been completely'defined but are believed to be of metamorphic and igneous origins. The northern'; ;
<br /> and southern portions of the Great Valley Province have been designated the Sacrainento arid San
<br />''• Joaquin Valleys, respectively.
<br /> The:Modesto, Riverbank and Turlock Lake Formations-and overlying recent alluvium are the
<br /> principal source of domestic ground water'in the 13,500=square=mile San Joaquin Valley Ground.,
<br /> Water.Basin(Basin 5-22). This basin is drained primarily by the San Joaquin River. Ground water.
<br /> is considered to be of beneficial use and-is used for domestic, industrial and commercial purposes.
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<br /> STRATIGRAPHY
<br /> Soilconsistin o., ,fbrown-to tan=colored;cla Y, cla a si,lt, or clayey fne.sand,were encountered from
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<br /> surface. grade to between 13.and 17 feet,bsg. Below 13 -to 17. feet bsg, the ,soil ,is.:composed
<br /> predominantly of .fine to coarse sand'and gravel; laterally;ahe''coarser=grained soil"appear to be
<br /> localized in"'a northerly irend_along,the east side-of the property.
<br /> Two soil samples,one from the'uppermost,•fine-grained layer'and'one from the underlying'sand and'
<br /> graver layer, were collected from soil• borings 'B18 and Biz, respectively, and `analyzed�for ;
<br /> geotechnical properties: The fine-grained sample,,collected from 5 feet bsg at boring B1'8;'was
<br /> t described'as a mottled brown clay and clayey sand,' with 40%'porosity and a low organic content s .
<br /> (L5%}. The.sand sample,collected from•15 feet bsgjin boring'B17, was.described as a:,dark'gray.
<br /> Isand with 33.9% porosity and low organic content (0.5%);
<br /> „ Advanced GeoEnvironmental,,Inc.
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