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Project No 034-97252 <br /> Page No 3 <br /> a thick heterogeneous sequence of sediments derived from erosion of the adjacent Sierra Nevada to the east <br /> and the Coast Ranges to the west These sedimentary rocks are mainly Cretaceous The depth of the <br />' sediments vary from a thin veneer at the edges of the valley to depths in excess of 50,000 feet <br /> The surficial deposits in the area of the subject site are mapped as Quaternary alluvium of the <br />' Modesto Formation The subsurface conditions encountered on the subject site are described in Section <br /> 7 0 of this report <br />' According to Groundwater Elevation Maps prepared by the San Joaquin County Flood Control and <br /> Water Conservation District, the depth to groundwater below the subject site is approximately 40 feet <br />' below grade, with a regional gradient toward the west We contacted officials with the San Joaquin County <br /> Flood Control District to determine if specific groundwater depth information is available for the area of <br /> the subject site According to the officials contacted, groundwater depths ranging from about 30 to 60 feet <br /> I <br /> were measured within about a mile of the site in the fall of 1997, and that based on the groundwater <br />' elevation contours developed by the District, groundwater would be expected at an approximate depth of <br /> 40 feet on the subject site <br /> 6.0 PERMITTING <br /> Krazan submitted a Workplan and drilling permit application to the San Joaquin County <br /> Environmental Health Department prior to drilling A copy of the completed County permit is provided <br /> Iin Appendix A <br /> 7.4 SUBSURFACE EXPLORATION AND SOIL SAMPLING <br /> IOn January 14, 1998, two exploratory borings were advanced with a truck mounted drill rig <br /> I utilizing eight-inch diameter hollow augers within the general area of the tormer UST on the subject site <br /> (see Site Map, Figure 2) Boring Bla was located in an area of significant asphaltic concrete cracking <br /> (area of possible excavation backfill settlement) However, native soils were encountered within this <br /> boring within a depth of three feet and this boring was abandoned since it did not appear that this boring <br /> was within the former UST pit area Boring B1 was located northerly of Bla within the southerly portion <br /> of the former UST area as shown on site drawings within the referenced Phase I report Boring B1 was <br /> IKRAZAN&ASSOCIATES,INC <br /> Offices Serving the Western United States <br /> 3497252 REP <br />