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FILE /FF • ANALYTICAL LLC R Paul Furry Quality Assurance Officer Kiff Analytical,LLC 2795 2"a Street,Suite 300 Davis,CA 95616 April 16,2004 John Lynch Wright Environmental 707 E l ls'Street,Suite 120 Tracy,CA 95376 Subject Recent QA inquiry for the Cox and Cox samples Dear Mr Lynch, In response to Chris Palmer's mqui y on Friday April 2, 2004 regarding the methylene chloride results from several reports for the Cox and Cox site at 595 E 11a'Street in Tracy,California,I have performed an audit of the data and records associated with recent reports for this project and found the methylene chloride results to be problematic We believe the following samples became contaminated with methylene chloride after they arrived at the laboratory 37139 sample 02 (S-12-W-5) 37253 sample 01,02,04 (S-11-W-0, S-11-W-10, and S-11-E-10) • 37298 sample 01,02,03,04,05 (S-11-W-20, S-11-E-20, S-10-E-15, S-10-W-15, S-11-M-15) 37362 sample 01 (S-IO-IW-20) 37363 sample 01 (S-l0-L-0) Between late February and mid March, the lab experienced a rise in background methylene chloride concentration Methylene chloride is used as the chief solvent in our extraction laboratory for performing TPH as Diesel analysis AIthough the extraction room is in a different part of the lab than the volatile analysis preparation room, and separate HVAC systems are used for each area, it is still possible for low concentrations of air-born solvent to contaminate volatiles samples in certain circumstances That seems to be the case with the samples listed above The narratives for these reports have been amended, citing the probable cause of the methylene chloride Ints as laboratory-induced contamination As a permanent solution to this issue, we have adopted a plan to alter the solvent system for the diesel extraction process so that methylene chloride will no longer be used m the lab,eliminating any possibility of the problem reoccurring in the future This modification to the diesel extraction technique and solvent system has a target implementation date of mid-May In the mean time,we have implemented a short-term fix that will prevent further occurrences until we have the new extraction technique up and running I would like to apologize for this issue Ultimately, it is my responsibility to improve our QA system and I thank you for identifying this gap in our quality assurance process Our lab takes great pride in the quality of the data that we present and welcome any opportunity to improve our systems We look forward to confining to provide high quahty laboratory service to you and your company Sincerely, -k.P"-14n R Paul Furry,QA Officer Kiff Analytical,LLC Kiff Analytical,LLC 2795 Second Street,Suite 300,Davis,CA 95616 530 297 4800 530 297 4808(flax)