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Lopez Property - 2 - 11 May 2022 <br /> <br /> <br /> <br />CPT-3. By 15 July 2022, please submit a work plan presenting a scope of work <br />for installation of a deep screened well to the northeast of the source area. <br />3. Petroleum hydrocarbons were detected in all three intermediate zone grab <br />groundwater samples. AGI detected 1,2-dichloroethane (1,2-DCA) at 8.0 <br />micrograms per liter (µg/L) in CPT-3, 0.27 µg/L in CPT-4, and 2.5 µg/L in CPT-5. <br />CPT-3 is located northeast of the source area. Based on these results, 1,2-DCA <br />appears to be adequately delineated to the east but has not been adequately <br />delineated to the northeast. Additional delineation in the intermediate zone is <br />needed to the northeast of CPT-3. In the work plan due 15 July 2022, please <br />include a scope of work for installation of an intermediate screened well to the <br />northeast of the source area. <br />4. Staff does not concur with AGI’s recommendation for no further action. AGI <br />performed the last reported groundwater monitoring event on 9 September 2020. <br />Staff requests that you please resume semi-annual groundwater monitoring <br />during the first and third quarters, and please provide the next monitoring report <br />by 30 November 2022. <br />If you have any questions or concerns, please contact me at (916) 464-4792 or by email <br />at vera.fischer@waterboards.ca.gov. <br />Sincerely, <br /> Vera Fischer, P.G. <br />Engineering Geologist <br /> <br />Galvin Kauffman, P.G. 9542 <br />Senior Engineering Geologist <br />cc: Mr. Daniel Villanueva, AdvancedGeo, Inc., Stockton (by email) <br />Ms. Nereida P. Lopez, Stockton <br />Mabel Keir Estate, Oakdale