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West Clay Properties Page 2
<br /> 639 West Clay Street November 15, 20'12
<br /> Stockton, California 95206
<br /> Whether oxygen sparging, ozone sparging, or some other method is implemented at this site to
<br /> remediate the petroleurn hydrocarbon contamination is dependent on receiving and evaluating
<br /> various methods proposed in the feasibility study. This is why the EHD stresses the importance
<br /> of receiving this study.
<br /> At the recommendation of the CUF, the EHD has reviewed the latest groundwater analytical
<br /> results submitted in Groundwater Monitoring Report — Second Quarter 2012, and directs that
<br /> the following sampling schedule be implemented, effective immediately:
<br /> • Semi-annually collect groundwater from MW-1 and MW-2 and analyze the samples for
<br /> total petroleum hydrocarbons quantified as gasoline (TPH-g); total petroleum
<br /> hydrocarbons quantified as diesel (TPH-d); benzene, toluene, ethylbenzene and total
<br /> xylenes (BTEX); tertiary-amyl methyl ether (TAME) and 1,2-dichloroethane (1,2-DCA);
<br /> • Semi-annually collect groundwater from MW-29 and analyze the samples for TPH-g,
<br /> TPH-d, BTEX; methyl tertiary-butyl ether (MTBE), TAME and 1,2-DCA;
<br /> • Annually collect groundwater from MW-27 and analyze the samples for TPH-g, BTEX
<br /> and MTBE;
<br /> • Annually collect groundwater from MW-9, MW-11B and MW-28 and analyze the
<br /> samples for MTBE;
<br /> • Annually collect groundwater from MW-14B and analyze the samples for MTBE and
<br /> 1,2-DCA;
<br /> • Annually collect groundwater from EW-2 and analyze the samples for TPH-g and
<br /> BTEX;
<br /> Biennially collect groundwater from MW-10 and analyze the samples for MTBE;
<br /> • Discontinue collecting depth-to-water, total depth measurements, and sampling MW-3,
<br /> MW-4, MW-5, MW-7, MW-8A, MW-8B, MW-11A, MW-12A, MW-12B, MW-13A,
<br /> MW-1313, MW-14A, MW-16 through MW-26 and EW-1; and
<br /> • Annually collect total depth measurements for MW-1, MW-2, MW-9, MW-10, MW-11 B,
<br /> MW-14B, MW-27 through MW-29 and EW2.
<br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209) 468-
<br /> 9852, or by email at vmccartney(cD_slcehd.com.
<br /> Sincerely,
<br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG
<br /> Senior Registered Environmental Heal 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
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