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I Kra�rer���socrat� <br /> STRUCTURAL ENGINEERS, IHC <br /> October 12, 1994 <br /> Capstone Remediation Corporotbri ! <br /> 17875 Von Karmen, Suite 200 <br /> Irvine, CA 92718 <br /> AM, Mr Jimmy Allumns <br /> RE The Bridges Specialty Center, Stockton, CA <br /> (Kramer and Associates Job No 9488) <br /> Gentlemen, <br /> I <br /> This letter is a follow-up to our site visit at the Bridges Specialty Center on Ootobor 11, <br /> 1994 The purpose of the visit was to determine the effects of the caving of the soil <br /> inside the elevator pit According to the geotechnical engineer, Ron Herman of <br /> Kleinfelder, the localized caving is most likely due to the original drilling of the elevator <br /> shaft casing. <br /> We observed that the caving appeared to be confined to the intoner of the pit The <br /> perimeter walls appeared to have full bearing on native or compacted soils. We also <br /> determined that the pit wall is four inches thick without a reel behind the wall A visual <br /> inspection of the interior and exterior faces of time shaft wail did not reveal any signs of <br /> settlement <br /> The remediation process may resume if the pit walls continue to be supported by the <br /> soil To reduce the change of settlement, we recommend that the drilling sequence be <br /> revised as follows. <br /> Day 1 Drill and backfill one hole in two opposite comers of the pit No other <br /> holes are to be dniled on day 1. <br /> Day 2 Dnil and backfill the remaining two comers of the pit No other <br /> holes are to be drilled on day 2 <br /> Day 3 A regulzr drilling sequence may begin for time remaining area inside the <br /> pit <br /> X002 Dow MnLie,State 136 Tush, CA=92680 <br /> ()14) 338-6222 FAX (114) 838-2023 <br />