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Mr Carl Knowles 3 17 July 2018 <br />intend to maximize the groundwater pumping rate and these flow rates their estimate of <br />the maximum achievable rate. <br />4 As stated above, Stratus has not provided technical justification for their claim that <br />discharged groundwater will readily infiltrate at the Site, nor plans for testing this claim. <br />Prior to remediation system construction, please conduct a standard infiltration rate test <br />at the Site in accordance with American Society for Testing and Materials (ASTM) <br />protocol. Please present the results in a brief letter report which also presents Stratus' <br />proposed groundwater pumping rate during groundwater extraction. <br />The Work Plan states that the groundwater extraction system will include three <br />1,000-pound GAC vessels connected in series. However, the Operation and <br />Maintenance section of the Work Plan only mentions collection of influent and effluent <br />samples during routine Site visits. Please collect a midpoint sample during each Site visit <br />to allow for changeout of GAC media prior to petroleum hydrocarbon constituents being <br />discharged from the GAC effluent stream to ground surface at the Site. <br />If you have any questions or comments, please contact me at (916) 464-4707 or via e-mail at <br />geoff.rader@waterboards.ca.gov . <br />Geoffrey Rader, P.E. #080249 <br />Water Resource Control Engineer <br />cc: Ms. Vicki McCartney, San Joaquin County Environmental Health, Stockton <br />Mr. Scott Bittinger, Stratus Environmental, Inc., Cameron Park