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McBillin Real Estate Investment - 2 - 13 September 2018 <br />2154 S. El Dorado Street <br />Stockton, San Joaquin County <br />Table 2 - Pilot Test <br />Function Equipment Duration Active <br />Well <br />Observation <br />Points <br />Observed <br />Parameters <br />Observation <br />FrequencyA <br />Effluent <br />Treatment <br />Soil <br />Vapor <br />Extraction <br />150cfm <br />(2.5hp) <br />Blower <br />8 hours VW-1 <br />Influent, <br />Effluent <br />Flow Rate 30 Minutes 4x 4x 400Ibs <br />GAC <br />Vessels <br />drocarbon Hydrocarbon <br />Concentrations Hours <br />VW-2, VVV-3 Pressure 30 minutes <br />In-Situ <br />Air- <br />Sparge <br />—25hp. <br />compressor <br />8 hours <br />(1,440-3 2,880 ft <br />of air) <br />IAS-1 <br />IAS-1 <br />(groundwater) <br />romate <br />Hydrocarbons, <br />arsenic, total <br />chromium, <br />h exavalent <br />chromium, iron, <br />manganese, <br />b <br />Before/After <br />N/A <br />IAS-1 (air) Injection rate 2 Hours <br />IAS-1, IAS-2, <br />MW-4, MW-5, <br />MW-6 <br />DTW, DO <br />Before/After; <br />2 hours <br />during <br />cfrn=cubic feet per minute; hp=horse power GAC-granular activated carbon; DWV=depth 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 />Table 3 - Contingency Plan <br />Remedial Parameters <br />Maximum <br />allowable <br />increase <br />from baseline <br />Confirmation <br />SamplingA Trigger <br />Plan <br />Implementation Plan <br />Arsenic, total <br />chromium, hexavalent <br />chromium, iron, <br />manganese, bromate <br />20% <br />1 month <br />following <br />post-pilot <br />test sampling <br />Post-pilot test <br />and confirmation <br />sampling >20% <br />above baseline <br />Batch extract —5,000 gallons <br />from IAS-1 and/or MW-6; <br />followed by additional <br />confirmation sampling <br />A= Confirmation sampling needed only if post-pilot test sampling concentrations >20% above baseline. <br />Central Valley Water Board staff concur with the proposed scope of work. By 11 January 2019, <br />please submit a Pilot Test Report detailing the completion of the remedial well installations and <br />pilot test as discussed above, and the resultant findings. Please include all performance and <br />analytical data in tabular form, and include discussion of the efficacy of SVE/AS remediation at the <br />Site, and feasibility of full-scale implementation. <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 at alan.buehlerwaterboards.ca .qov. <br />$-\ <br />Alan M. Buehler, P.G. <br />Engineering Geologist <br />cc: Sriram lyer, State Water Resources Control 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