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V:est Clay Properties �w Page 2
<br /> 639 West Clay Street December 19, 2011
<br /> Stockton, California 95206
<br /> Since the initial start up of the ozone system in November 2006, AGE has consistently
<br /> recommended ozone injection in the former UST No. 3 area, this in spite of the directive from
<br /> the EHD to submit a feasibility study comparing several remedial technologies. You are now
<br /> directed to submit the feasibility study and a recommendation as to the preferred remedial
<br /> technology to this department by 03 February 2012.
<br /> AGE has proposed a revised sampling schedule to the EHD by email dated 08 December
<br /> 2011. Upon reviewing current groundwater analytical results the EHD directs that the
<br /> following sampling schedule be implemented, effective immediately:
<br /> • Semi-annually collect groundwater from MW-1, MW-2, MW-8B, MW-27 and MW-29
<br /> and analyze the samples for benzene, toluene, ethylbenzene and total xylenes
<br /> (BTEX), methyl tertiary-butyl ether (MTBE), ethyl tertiary-butyl ether (ETBE), tertiary-
<br /> amyl methyl ether (TAME), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE),
<br /> 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB);
<br /> • Semi-annually collect groundwater samples from MW-9, MW-11 B, and MW-28 and
<br /> only analyze the samples for MTBE;
<br /> • Semi-annually collect groundwater samples from MW-14B and analyze the samples
<br /> for MTBE and 1,2-DCA:
<br /> • Discontinue collecting depth-to-groundwater and total depth measurements for
<br /> monitoring wells MW-16 through MW-24;
<br /> • Annually collect total depth measurements for MW-1 through MW-5, MW-7 through
<br /> MW-14A/B, MW-25 through MW-29, EW-1 and EW-2,-
<br /> Discontinue
<br /> W-2;Discontinue sampling MW-3, MW-4, MW-5, MW-7, MW-8A, Myk'�B, MW-11A,
<br /> MW-12A, MW-12B, MW-13A, MW-1313, MW-14A, MW-16 through MW-26;
<br /> • Annually collect groundwater from EW-1 and analyze the samples for MTBE and 1,2-
<br /> DCA;
<br /> • Annually collect groundwater from EW-2 and analyze the samples for BTEX. MTBE,
<br /> ETBE, TAME, TBA, DIPE, 1,2-DCA and EDB;
<br /> • Biennially collect groundwater from MW-10 and analyze the samples for MTBE.
<br /> Although monitoring wells MW-6 and MW-15 have been destroyed, please include these well
<br /> locations on future site maps submitted in reports for this site.
<br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) 468-
<br /> 9852, or by email at vmccartney(q_)sicehd.com.
<br /> Sincerely,
<br /> Victoria L. McCartney, REHS 0 Nuel C. Henderson, Jr.. PG
<br /> Senior Registered Environmental Health Specialist Engineering Geologist
<br /> c: Mr. William R Little, PG, Advanced GeoEnvironmental, Inc.. 837 Shaw Road.
<br /> Stockton, California 95215
<br /> Mr. James L L Barton, PG, California Regional Water Quality Control Board Central
<br /> Valley Region 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670
<br />
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