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(YVATC <br /> A S S O C I A T E S I N C . <br /> A Flame Ionization Detection (FID) meter will be used at the site to monitor breathing air as a <br /> standard health and safety practice. The statement in the workplan regarding the use of a FID for <br /> soil sample selection was inadvertently left in from a report template. <br /> Groundwater Sample Analysis <br /> In anticipation of groundwater remediation alternatives for the site, ATC will submit groundwater <br /> samples for laboratory analysis of hexavalent chromium by EPA Method 7199 and nitrate and <br /> sulfate by EPA Method 300.0. Groundwater samples will also be measured for dissolved oxygen <br /> and oxidation reduction potential in the field. <br /> Once approval of this workplan addendum has been received, ATC will secure any access <br /> agreements and obtain permits from PHS/EHD. ATC will notify the RWQCB at least 48 hours <br /> prior to beginning any field activities. Drilling activities are anticipated to be completed in two <br /> days. The summary report will be submitted to the RWQCB approximately four to five weeks <br /> after the completion of field activities. <br /> If you have any questions or require additional information regarding this workplan, please <br /> contact us at (209) 579-2221. <br /> Respectfully submitted, <br /> ATC Associates Inc. <br /> Jeanne Homsey, P.E. r �BGtYK <br /> Registered Engineer No. C47410 <br /> 0. C 4F -;0 <br /> 9 Oxy Ig.,. <br /> Attachments <br /> cc: Mr. Mike Lescisin <br /> w:\62583\reports\WKPIa -borings.dm 2 <br />