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<br /> <br />Central Valley Regional Water Quality Control Board <br /> <br />22 September 2021 <br />Ms. Andrea Wing <br />Principal Program Manager <br />c/o Equilon Enterprises LLC dba Shell Oil Products US <br />20945 S. Wilmington Ave. <br />Carson, CA 90810 <br />Former Shell Service Station #204-7524-3505 (T0607700697), <br />2575 Country Club Boulevard, Stockton, San Joaquin County <br />Dear Ms. Wing, <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the Delineation Assessment Work Plan (Work Plan), dated 29 July 2021, <br />submitted on your behalf by Wayne Perry, Inc. (WPI). The Former Shell Service Station <br />is located at 2575 Country Club Boulevard in Stockton (Site). <br />In the Work Plan, WPI proposes to advance three (3) soil borings to approximately <br />8 feet below ground surface (ft bgs), and to collect a grab groundwater samples from <br />each boring. WPI will submit grab groundwater samples for laboratory analysis for total <br />purgeable petroleum hydrocarbons, benzene, toluene, ethylbenzene, total xylenes, <br />methyl tertiary butyl ether, tertiary butyl alcohol, ethyl tertiary butyl ether, tertiary amyl <br />methyl ether, and di-isopropyl ether. <br />Central Valley Water Board staff concurs with the areal locations of the borings for <br />lateral delineation; however, staff does not concur with a predetermined sample depth. <br />Staff recommends that WPI’s geologist select an appropriate sample depth based on <br />the geology of the borings and the migration of dissolved oxygenates. Please submit a <br />results report by 30 December 2021. <br />You must comply with all local permitting requirements. Please provide me with at least <br />three (3) working days’ notice to allow me the opportunity to observe. <br />