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691 N. Laverne Avenue, Suite 101 <br /> Fresno, CA 93727 <br /> P 559.497.2880 <br /> ASSOCIATES www.bskassociates.com <br /> Sent via email: hnussbaumer@sigov.org <br /> Mach 1, 2023 BSK Project E20-016-01F <br /> Ms. Helene Nussbaumer CM,Airport Deputy Director <br /> Stockton Metropolitan Airport <br /> 5000 S.Airport Way, Suite 202 <br /> Stockton, California 95206 <br /> Subject: Revised Workplan <br /> Additional Site Investigation <br /> Per-and Polyfluoroalkyl Substances in Soil and Groundwater <br /> Stockton Municipal Airport <br /> 5000 S.Airport Way,Stockton,California <br /> (GeoTracker#T10000012778) (WDR ORDER NO.WQ-2019-0005-DWQ) <br /> Dear Ms. Nussbaumer: <br /> BSK Associates (BSK) has prepared this Revised Workplan for the Stockton Metropolitan Airport (SCK)to <br /> conduct Additional Site Investigation for delineation of Per- and Polyfluoroalkyl Substances (PFAS) as <br /> requested by the State of California Central Valley Regional Water Quality Control Board(CVRWQCB).The <br /> request is outlined in their April 8, 2022 letter titled "Assess Full Extent of Per- and Poly-Fluorinated <br /> Substances (PFAS) Contamination in Soil and Groundwater at Stockton Metropolitan Airport, 5000 S. <br /> Airport Way, Suite 202, Stockton, San Joaquin County, California"which was drafted in response to BSKs <br /> "Revised Report Preliminary Site Investigation for PFAS Stockton Metropolitan Airport (SCK) Stockton, <br /> California" dated, October 15, 2021 (Revised May 1, 2022). The following Workplan details BSK's, <br /> proposed scope of services,schedule and conditions to provide the required consulting services.Although <br /> a very rough estimate has been provided, an updated cost estimate to implement this Workplan will be <br /> provided after the approval of the Workplan by the CVRWQCB. <br /> We appreciate the opportunity to assist you with this project. If you have any questions, please contact <br /> Tony Martin at(916) 517-2122. <br /> Respectfully submitted, <br /> BSK Associates <br /> ypNl How�p <br /> Morgan Antaramian, GIT Robert"Ton " Martin, PGA �'$p <br /> Staff Geologist II Principal Geologist it No.6768 't tl3 <br /> ccMA/RTM O. o <br /> Attachment: Workplan . <br /> 'g4F�� ,�` <br /> Environmental, Geotechnical,Construction Services,Analytical Testing-An Employee-Owned Company <br />