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Drilling Log I� IT CORPORATION Monitoring Well MW-4 A Member of the IT Group Project 7-Eleven, SSR 19976 _ Owner 7-Eleven, Inc See Site Map Location 1399 N Main Street Manteca CAPro j No 779956 For Boring Location Surface Elev 33 03 ft Total Hole Depth 30 ft Diameter 8 in COMMENTS 1 Top of Casing 32 73 ft Water Level Initial 20 ft Static NA ft Screen Dia 2 in Length 20 ft Type/Size Sch 40 0 020 o Casing Dia 2 In Length 10 ft Type Sch 40 PVC Fill Material Cement grout Rig/Core Mobile Drill B-61 Drill Co Grggq Drilling___ Method Hollow Stem Auqer Driller Trevor Joyner Log By Douglas Gay Date 05/17/99 Permit # Checked By Ed Stmonis License No California RG94422 C T N 2 � Description +' —N X- 0)pE N o Ol o n CL a a, m_ N (Color, Texture, Structure) U aa Trace < 10%, Little 10% to 20%, Some 20% to 35%, And 35% to 50% -2 0 < < Fine SAND brown dry no hydrocarbon odor 2r sw 4 ` �l ` ` 0 o MW-4@5 4 Silty fine SAND (60 40) brown dry no hydrocarbon odor 6 6 SM Recovery at 80% 12 ' 8 0 o MW-448 15 SILT with very fine SAND (80 20) bi own dry no hydrocarbon 1s 14 ML odor Recovery at 90% 10 ' 12 _ 0 o MW-4@13 11 Fine SAND tan-brown dry loose, subangular 14 = 26 sp Recovery at 75/ Grades fine to medium SAND no hydrocarbon odor i6 = Recovery at 95% 18 = 0 0 MW-410189 ML Silty SAND (20 80) interbedded with sandy SILT (70 30) brown 2 1 15 most micaceous no hydrocarbon odor 20 22 — 5M Interbedded silty SAND and sandy SILT grayish brown wet, soft ' — no hydrocarbon odor 0 C MW-4@23 11 24 = 12 Recovery at 90% 15 —_ tf5r 26 = CL Grades silty, sandy CLAY 28 = 0 o Mw-4@28 20 sw Medium to coarse SAND brown wet loose subrounded no 6 hydrocarbon odor Recovery at 50% _ C� 30 — ' 07/72/1909 hlhlog-Mar 90 Page I of } J