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- <br /> I <br /> I I <br /> y m I Ld.,l T�i.71h <br /> I I <br /> I I <br /> Project No 58080-06-02 <br /> May 5, 1995 <br /> I ' <br /> 1 According to Texaco Oil Company representatives, the USTs located in the southern portion of the <br /> site were removed from the site in 1979 prior to Texaco selling the property In 1981, a building <br /> ' permit was issued by the City of Lodi to the Pioneer Take Out Corporation for the construction of <br /> the existing restaurant structure Current site improvements are shown on Figure 2, Site Plan <br /> 1 2 Regional Geology/Hydrogeology <br /> The site is located in the Great Valle Province in the Northern San Joaquin oagwn Valley The subsurface <br /> geology generally consists of continental deposits which are highly, stratified, interbedded, coarse- <br /> grained sediments and fine-grained cohesive to Iithified sediments encountered to depths of <br /> approximately 2,000 feet bgs Geologic formations and informal stratigraphic units underlying the <br /> site include, with respect to increasing depth, the Younger Alluvium of the Holocene age, the OIder <br /> Alluvium of Pleistocene to Holocene age, the Turlock Lake Formation of Pleistocene age, the <br /> Laguna Formation of Pliocene age, the Mehrten Formation of Pliocene age, and the Valley Springs <br /> Formation of Miocene age Subsurface sediments in the Lodi area are comprised mainly of sands <br />' with discontinuous lenses of clays and silts to a depth of approximately 100 feet bgs <br />' The source of groundwater in this area is predominantly the Tertiary and Quaternary continental <br /> deposits which consist of the overlying alluvium, the Turlock Lake, and the Laguna Formations in <br /> the Lodi area Three Pleistocene river channels in the Mokelumne River area have been mapped <br /> and include the Turlock Lake Formation found at a depth of about 250 feet bgs, a second channel <br /> deposit is found at a depth of about 90 feet bgs and a third channel deposit is found at a depth of <br /> about 40 feet bgs City of Lodi water level data indicate that the groundwater gradient of first <br />' encountered groundwater is generally to the south but may tend to migrate from the south-southwest <br /> to the south-southeast over time First groundwater in 1994 has been measured at depths ranging <br /> tfrom approximately 41 to 62 feet bgs in the Lodi area <br /> -5- <br /> 111 <br />