Laserfiche WebLink
J. H. KLEIN FELDER & ASSOCIATES <br /> File : W-2004-1 <br /> AOrii 1 , 1986 <br /> gage 2 <br /> • We do not see any constraints to screening twenty feet <br /> below the water table when no competent confining layer <br /> is encountered in the first 20 feet . However, if we do <br /> encounter a confining layer less than 20 feet below the <br /> first water table, we will set the well into that layer <br /> regardless of the depth below the water table. This is <br /> done to preclude cross contamination by creation of a <br /> conduit through that confining layer. <br /> • Our proposal stated we would collect samples at five foot <br /> intervals . However, we request a reconsideration for <br /> requiring analyses of all samples with a positive PID. <br /> Our experience has shown a low positive reading does not <br /> necessarily indicate soil contamination as it may be <br /> attributable to vapor migration through the soil pores, <br /> either in a horizontal or veritcal direction. We <br /> recommend analyzing only a few select samples and <br /> archiving the remainder until the results of the first <br /> set of analyses are received. We are proposing this to <br /> expend our client ' s funds in the most cost-effective <br /> manner . In most cases the cost of analytical services <br /> are 50% or more of the total cost of these types of <br /> investigations. Our client has been advised of this <br /> permit condition and at this time we are proceeding in <br /> accordance with the permit. <br /> • The twenty five foot depth of each soil boring was set <br /> forth in our proposal as a result of the meeting held <br /> between you and Greg Fletcher of my staff on February 5 , <br /> 1986 . We understand the technical rationale for amending <br /> the proposal, however our concern is that our current <br /> proposal to Unocal states the boring depth would be <br /> twenty five feet . Typically we provide our services on a <br /> time and materials basis with a maximum not to exceed <br /> figure. When site conditions are encountered we <br /> customarily inform the client before the additional work <br /> is performed to receive their authorization. The open <br /> ended clause makes it difficult to inform the client <br /> before the work is performed because of the general <br /> logistics of the operation. We will support your request <br /> on the basis that if contamination is found, re-drilling <br /> to assess the conditions below the set depth would be <br />