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- a <br /> ! MUM N FELDER <br /> File No, 20-3725-01 <br /> August 5, 1993 <br /> " Mr. Larry Philips <br /> Brown and Caldwell, Consultants <br /> 723 "S" Street <br /> Sacramento, CA 95814-7092 <br /> Subject: ADDENDUM TO LETTER DATED I <br /> UNDERGROUND STORAGE TANK EXCAVATION . <br /> KENT OIL FACILITY <br /> STOCKTON, CALIFORNIA <br /> 5 <br /> Dear Mr. Philips: <br /> a <br /> At your request, representatives from our firm have periodically been visiting the Kent Oil <br /> Facility and, observing the exposed soils in the excavation. - To date, the excavation has a <br /> extended approximately 45 feet below subgrade, and below the near-surface black silty clay <br /> layer the soils have been relatively consistent. Based on our observations, the soils have <br /> generally consisted of brown silty clay and clayey silt which are very stiff to hard. We have � <br /> not observed significant sand layers that would adversely affect slope stability. We now <br /> understand that there is a need to possibly extend the excavation to approximately the <br /> maximum depth of 55 feet. Based on our observations, it is our opinion that the excavations <br /> ` can proceed as planned. Currently, the deepest portion of the excavation is away from the <br /> truck lane north of the excavation. If it is necessary to deepen the excavation immediately <br /> below this truck area, or even widen the excavation at the 45 foot level, we recommend that <br /> provisions be made to refill trucks at an alternate location to avoid surcharge loading. <br /> This letter summarizes our recent observations. If you have any questions or need further <br /> information, please contact us. Please note that the "Limitations" section contained in the <br /> previous referenced letter still apply. <br /> Respectfully`submitted, <br /> KLEINFEL R, INC <br /> Ron Heinzen, G.E. <br /> Engineering Manager <br /> RH:md 8193` <br /> KIEl�i)�F S��.9htr�1Fl n <br /> -4 f t SFrt!(-; Cilockton, CA 95 <br /> 205 (209) 946-1345 <br /> _� . <br />