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Mr. Nathan Esformes -2- 19 September 1995 <br /> QA/QC procedures should include one duplicate sample for each set of 10 samples collected. A travel <br /> blank, field blank, and laboratory spike also should be analyzed for each set of samples submitted for <br /> analyses. <br /> Schedule <br /> The report evaluating the new extraction system to be submitted by April 1996 should include the items <br /> included in the attached Items to be Included in a Site Assessment Report. Please submit this report by <br /> 19 April 1996. <br /> The work plan for containment of the chloroform plume is approved with the condition that <br /> MW-4A will be replaced if it is not able to sustain a five gpm pumping rate after redevelopment, the <br /> locations for disposal of soil containing chloroform are identified, the reason is given for using 45 . <br /> mg/kg chloroform as a soil cleanup criteria, and the QA/QC procedures include duplicates, travel and <br /> field blanks, and laboratory spikes. Please submit information on the latter three items by 13 October <br /> 1995. Regarding definition of the lateral extent of chloroform in ground water north of MW-7, we will <br /> address this issue with our review of the 7 September 1995 Assessment of Contamination North ofMW- <br /> 7. <br /> If you have any questions, you may call me at (916) 255-3048. <br /> fpl�POLLY OWRY <br /> Associate Engineering Geologist <br /> PAL:ms:njs <br /> Attachment <br /> cc: San Joaquin County Public Health Services, Stockton <br /> Mr. Robert Dixon, AGRO Environmental Services, Stockton <br /> Mr. Michael Campos, Graham & James, Sacramento <br /> Mr. John Kramer, Condor Earth Technologies, Stockton <br />