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u � <br /> KLEINFELDER <br /> August 5, 1992 <br /> File: 24-220191-A00 <br /> Mr. Manfred Sanders <br /> Deputy Purchasing Agent <br /> County of San Joaquin <br /> Purchasing Division <br /> 222 E. Weber Avenue, Room 675 <br /> Stockton, CA 95202 <br /> SUBJECT: Proposed Soil Assessment Work Plan Addendum <br /> Advancement of Soil Borings and Closure <br /> of Underground Storage Tank <br /> Request for Proposal 92-3 <br /> Stockton, California <br /> Dear Mr. Sanders: <br /> This letter is an addendum to Kleinfelder's scope of work, 24-YP2592, dated April 23, <br /> 1992,which describes proposed soil assessment activities regarding the abandonment of an <br /> underground storage tank at the San Joaquin County Courthouse Annex. This addendum <br /> was prepared in response to San Joaquin County Public Health Services (SJCPHS) <br /> comments, namely: <br /> - Substituting an angle boring for one of the three vertical borings, <br /> - Collecting soil samples beneath piing, <br /> - Identifying the grout/bentonite mixture, <br /> - Revising Plate 1 in the April 1992 proposal, and <br /> - Submitting additional fees for underground storage tank closure permit. <br /> The changes in the work plan and additional conditions and understandings are described <br /> below. <br /> Task 2 - Drilling and Sampling of Three Borings <br /> The underground fuel storage tank is apparently placed on top of a concrete slab. Because <br /> of the slab and limited site access, Klemfelder proposed drilling three vertical borings <br /> adjacent to the tank. <br /> Angle Boring <br /> San Joaquin County Public Health Services has requested that one of the borings be drilled <br /> at an angle beneath the tank. Kleinfelder recommends advancing a 45 degree angle boring <br /> instead of the vertical boring located on the north side of the underground storage tank, <br /> shown in Plate 1. The boring will be advanced from the north in a southerly direction <br /> beneath the concrete slab supporting the tank. The orientation of the angle boring is <br /> shown in the revised Plate 1, attached. Meinfelder recommends that the other two borings <br /> remain vertical borings due to the limited site access and concrete slab. <br /> 18-92-330 Page 1 of 2 <br /> Copyright 1992 Meinfelder, Inc. <br /> hLFI�[FI [Ii R <i.— I i id, -nl <br />