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Stockton Charter Way Commingled Plume - 2 - 20 December 2021 <br />SMW-34E, SMW-35D, and SMW-36D. Stantec did not install these wells due to <br />off -Site access issues. The furthest downgradient D -zone monitoring well <br />SLMW-1 OD contains 1,200 micrograms per liter (ug/L) total petroleum <br />hydrocarbons as gasoline (TPHg). As such, installation of these three <br />delineation wells is still warranted. Stantec has identified an alternate property <br />on which they can install downgradient wells. Due to the access issues, in July <br />2022 email communication, Stantec staff submitted revised locations for these <br />three wells, and Central Valley Water Board staff concurred with the revised <br />locations. A copy of the email correspondence has been uploaded to <br />GeoTracker. <br />3. There are a number of Site wells that have never been impacted or are no longer <br />impacted. These wells may either be reduced to annual gauging/inspection only <br />or destroyed. Additionally, Stantec stated that a few Site wells have deteriorating <br />conditions which may require reconditioning or re -development. <br />4. By 17 February 2023, please submit a work plan which includes the following: <br />• A proposal for a shallow soil sampling scope of work to provide current <br />ARCO soil data for evaluation against LTCP Direct Contact and Outdoor Air <br />Exposure criteria. <br />Propose Site monitoring wells for gauge -only, reconditioning/re- <br />development, or destruction as needed and provide justification for each. <br />Depict revised delineation well locations on included Site maps. <br />If you have any questions or concerns regarding comments in this letter or regarding the <br />Site, please contact Alan Buehler at (916) 464-4615 or by email at <br />alan.buehler(c�-waterboards.ca.gov. <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />-,\pNAL (3\ <br />O G) <br />Q ALAN M. BUEHLER N <br />No. 9340 <br />�OF <br />CC list on next page. <br />*GalvVinffman, P.G. <br />Senior Engineering Geologist <br />