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ADDENDUM TO SOIL VAPOR PROBE PLAN <br /> Procedures for Sites with Shallow Groundwater <br /> This document is to be attached to a letter from Robert Hinchee, <br /> EA Engineering, to Richard Reed dated September 16, 1987. The <br /> information within the letter fulfills the required elements of a <br /> Soil Vapor Probe Plan. The purpose of this addendum is to detail <br /> Soil Vapor Probe procedures in cases of sites with shallow <br /> groundwater. <br /> Groundwater depth is routinely established at all sites where <br /> Soil Vapor Contaminant Assessment (SVCA) work is to be done. At <br /> sites where groundwater is shallow (from 5 to 10 foot depth), <br /> SVCA crews will establish groundwater depth using nearby existing <br /> groundwater monitoring wells, the same day as the SVCA. Crews <br /> will not allow the probes to penetrate deeper than the currently <br /> established groundwater depth. <br /> 10/20/87 <br />