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John and Margaret Marci Property Page 2
<br /> 2969 Loomis Road March 23,2009
<br /> Stockton, California 95205
<br /> The EHD conditionally approves the three pilot tests. GTI proposes to use monitoring wells MW-5
<br /> and MW-7, screened between fifty-five and seventy feet bsg, and MW-4, screened between
<br /> approximately sixty and eighty feet bsg, as observation wells. Groundwater is currently at
<br /> approximately fifty-three feet bsg, thus there is a minimum of one-and-a-half feet of water above
<br /> the screened intervals of MW-5 and MW-7 and over six feet of water above the screened interval of
<br /> MW-4. As a result, it is unlikely a drop in pressure will be observed in these three monitoring
<br /> wells. This is also true for injection well IW-101, and extraction wells EW-101, EW-102, and
<br /> EW-103, all screened between fifty-five and fifty-seven feet bsg. Measurements may be taken to
<br /> detect pressure reductions in these wells; however, the EHD does not expect to obtain useful data.
<br /> Instead, the EHD believes the three pilot tests should use injection well IW-1, and extraction wells
<br /> EW-1, EW-2, EW-3, and EW-6 as observation wells since these wells are screened within the
<br /> vadose zone. This means the first test would involve extracting groundwater and soil vapor from
<br /> proposed well EW-4 while measuring vacuum, depth to water, and collecting PID readings in
<br /> observation wells IW-1, EW-1, EW-2, EW-3, and EW-6; the second test would involve extracting
<br /> soil vapors from proposed well EW-6 while measuring vacuum, depth to water, and collecting PID
<br /> readings in observation wells IW-1, EW-1, EW-2, and EW-3; and the third test would involve
<br /> extracting groundwater and soil vapors from proposed well EW-5 while measuring vacuum, depth
<br /> to water, and collecting PID readings in observation wells IW-1, EW-1, EW-2, EW-3, and EW-6.
<br /> In addition,monitor pressure and depth-to-water in a monitoring well screened into the vadose zone
<br /> and located outside the potential radius of influence to allow for corrections in atmospheric pressure
<br /> variations and depth-to-water fluctuations.
<br /> Please submit a well permit application and permit/inspection fee of$404 to the EHD and notify
<br /> the EHD at least a week prior to initiating the fieldwork. Complete.the pilot tests by June 12, 2009,
<br /> and submit the report to the EHD within sixty days of completing the tests. Please contact Vicki
<br /> McCartney at(209)468-9852 or by e-mail at vniccartney(c sicehd.cona if you have any questions.
<br /> Sincerely,
<br /> Victoria L. McCartney,RENS Nuel C. Henderson,Jr., PG
<br /> Senior Registered Environmental Health Specialist Engineering Geologist
<br /> c: Mr. Reza Namdar Ghanbari, Geological Technics Inc., 1101 7`" Street, Modesto, California
<br /> 95354
<br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley
<br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670
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