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West Clay Properties Page 2
<br /> 639 West Clay Street April 15, 2010
<br /> Stockton, California 95206
<br /> screened between approximately forty and sixty feet bsg, is necessary north of MW-813
<br /> once results are made available from the newly installed well near MW-5. Although AGE
<br /> has stated by letter dated August 17, 2009, that the area northeast of MW-5 and B15 is a
<br /> residential area and not accessible, there appears to be adequate room in the area of
<br /> MW-5/1315 to install an additional well. Please submit to the EHD by June 15, 2010, an
<br /> addendum to the work plan that includes the additional monitoring well near MW-5, or
<br /> provide technical justification to the EHD for not installing this well.
<br /> In addition to the analyses for total petroleum hydrocarbons (TPH) quantified as gasoline
<br /> (TPH-g); TPH quantified as diesel (TPH-d); benzene, toluene, ethylbenzene, and total
<br /> xylenes (BTEX); methyl tertiary-butyl ether (MTBE), and 1,2-dichloroethane (1,2-DCA),
<br /> please include the analysis for tertiary-amyl methyl ether (TAME) for groundwater samples
<br /> collected from these newly-installed wells since TAME continues to be detected in
<br /> groundwater samples collected from MW-1 and MW-2. Monitor and collect groundwater
<br /> samples quarterly for one year from these newly-installed wells.
<br /> By letter dated May 19, 2009, the EHD directed you to submit laboratory reports for soil
<br /> samples collected during the removal of USTs TK1, TK2, TK4, and the dispenser in
<br /> December 1998. To date, the EHD has not received a response to this request. Please
<br /> provide the laboratory analytical report to the EHD when you submit the addendum to the
<br /> work plan.
<br /> Finally, AGE has stated in the work plan that "an additional groundwater remediation
<br /> feasibility engineering cost comparison analysis, including monitored natural attenuation
<br /> (MNA), in-situ oxidation (air-sparing and ozone injection) and groundwater extraction
<br /> should be evaluated with analysis of cost per remediation, once the limits of the dissolved
<br /> plume areas are determined." The EHD concurs with this, and based on the scope of
<br /> work proposed in this work plan, believes this can be accomplished by December 2010;
<br /> therefore, the EHD is extending the date for submitting this evaluation to the EHD from
<br /> December 15, 2009, to December 15, 2010.
<br /> If you have any questions concerning this letter, please contact Vicki McCartney at (209)
<br /> 468-9852, or by email at vmccartney(o-)sjcehd.com if you have any questions.
<br /> Sincerely,
<br /> Victoria L. McCartney, REHS 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, Stockton,
<br /> California 95215
<br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central
<br /> Valley Reqion, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670
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