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i Wong,Jeff From: Ahmed, Naseem Sent: Tuesday,July 16,2019 2:33 PM To: Wong,Jeff Subject: FW:Test Well Radius of Influence Letter, North Manteca Trunk Sewer Project From: Omar K. Khan<okhan@bskassociates.com> Sent:Tuesday,July 16, 2019 2:30 PM To:Ahmed, Naseem <nahmed@sjgov.org> Subject: FW:Test Well Radius of Influence Letter, North Manteca Trunk Sewer Project Good afternoon Naseem, See email response below from Water Quality Control Board regarding the monitoring well permit. Let me know if any questions. Thanks, i Omar K Khan Project Geologist BSK Associates 399 Lindbergh Avenue, Livermore, CA 94551 P:925.315.3151 x619 C: 209.625.6498 BzX Environmental, Geotechnical,Construction Services,Analytical Testing-An Employee-Owned Company 9 0 ®a A Please consider the environment be/ore printing this e-mail From: Buehler,Alan@Waterboards<Alan.Buehler@Waterboards.ca.gov> Sent:Tuesday,July 16, 2019 2:18 PM To:Timothy W. Berger<tberger@bskassociates.com> Subject: RE:Test Well Radius of Influence Letter, North Manteca Trunk Sewer Project Tim— I discussed this with my management, and we don't believe there to be any issues with the pump test as related to the petroleum plume of Frank's One Stop.The test is limited in duration(max of 18 hours),the test well is approximately 1500 feet from the nearest Frank's monitoring wells, and all of the Frank's monitoring wells on the northwest edge of the plume(well groups MW-37/38/39, MW-34/35/36,and MW-31/32/33/40,were all non-detect for TPHg, BTEX, MTBE, fuel oxys, and lead scavengers both of the times they were sampled, in March and June 2015. The last groundwater sampling event at the Frank's Site was performed in 12 domestic water supply wells within the plume area in March and June 2017,and the only analyte reported above the reporting limit was 8.8 ug/L MTBE in one well. The MW-37/38/39 well group is located approximately 175 feet northwest of the domestic well which contained 8.8 ug/L MTBE. 1