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OA. <br />CAL IFOV64\i?' <br />McBillin Real Estate Investi.....nt -2- 23 July 2018 <br />2154 S. El Dorado Street <br />Stockton, San Joaquin County <br />Function Equipment Duration Active <br />Well <br />Observation <br />Points <br />Observed <br />Parameters <br />Observation <br />FrequencyA <br />Effluent <br />Treatment <br />In-Situ <br />Air- <br />Sparge <br />—3hp <br />compressor 8 hours IAS-1 <br />IAS-1 <br />(groundwater) <br />Hydrocarbon <br />Concentrations <br />Before and <br />following <br />pilot test N/A IAS-1 (air) Injection rate <br />2 Hours IAS-2, MW-4, <br />MW-5, MW-6 DTW, DO <br />cfm=cubic feet per minute; hp=horse power; GAC=granular activate carbon; DTVVdepth to water DO=dissolved oxygen; <br />N/A=not applicable; A=observation frequency is in addition to observations made prior to the start of the pilot test. <br />Based on the results of the pilot test, AGE intends to determine the effective radius of influence <br />for SVE and AS, and design an appropriate full-scale SVE system and additional remedial well <br />network. <br />Central Valley Water Board staff concurs with the proposed pilot test. However, that <br />concurrence is contingent upon the submittal of the following additional information to Central <br />Valley Water Board staff: <br />The total volume of air to be applied over the course of the 8-hour pilot test <br />A proposed Contingency Plan to be implemented should concentrations of the remedial <br />indicators listed below increase more than 20% above the maximum baseline <br />concentrations. <br />By 24 August 2018, please submit the requested additional information. Upon review and <br />approval of the requested information, Central Valley Water Board will indicate that the pilot test <br />can commence, with the following conditions: <br />Please collect dissolved oxygen (DO) data in well IAS-1 prior to and following the pilot <br />test. <br />Please collect remedial indicator data prior to (baseline) and following the pilot test in the <br />following wells: <br />IAS-1, MW-6 <br />The remedial indicators noted above are to include: <br />arsenic, <br />total chromium, <br />hexavalent chromium, <br />iron, <br />manganese, and <br />bromate. <br />If you have any questions or concerns regarding comments in this letter please contact the <br />undersigned at (916) 464-4615 or by email n.buehlerwaterboards.ca.qov. <br />.kk <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />cc: Sriram lyer, State Water Resources • rol Board, UST Cleanup Fund, Sacramento <br />Michael Kith, San Joaquin County Environmental Health Department, Stockton <br />Tim Cuellar, Advance GeoEnvironmental Inc., 837 Shaw Road, Stockton 95215