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oil <br /> Lancaster <br /> Laboratories <br /> September 30, 2005 <br /> Ms. Deanna HardingJO <br /> Gettler-Ryan Inc. �} <br /> Suite J <br /> 6747 Sierra Court <br /> Dublin, CA 94568 <br /> Subject: Trip Blank Contamination <br /> LU Sample Number: 4596144 <br /> Facility Number: 90557 '�� �r •: <br /> City, State: Stockton, CA <br /> Dear Ms. Harding' <br /> Between July 15, 2005 and September 15, 2005, we experienced low-level toluene and total <br /> ��xyl each <br /> ne <br /> hits in trip blanks submitted with your samples. The contamination range was 0.5—2.7 pg <br /> /L <br /> All of these hits were just above the Method Detection Limit(MDL)and well below the Level <br /> of Quantitation (LOQ). <br /> Lancaster Laboratories performed an investigation to determine the cause of the low-level <br /> contamination in the trip blank; however, we were unable to identify the cause. The investigation <br /> included discussions with our bottles vendor and a review of the analytical lot check that was <br /> performed on the hydrochloric acid used to preserve the bottles. The laboratory storage blanks that <br /> were analyzed during the same time frame did not show a trend in toluene hits. <br /> Based on this investigation, the following corrective action plan has been put into place to prevent a <br /> reoccurrence: <br /> Each shipment of 40-ml-vials that is received at the laboratory will be tested for volatile <br /> contamination prior to trip blank preparation. If there are multiple lots in a shipment, a <br /> bottle should be taken from each lot. This additional testing will help to eliminate the <br /> possibility of the laboratory preparing trip blanks in contaminated bottles. <br /> The volatile laboratories have been instructed to investigate any evidence of <br /> contamination in trip blank samples prior to releasing analytical reports. <br /> if you have questions or concerns about this corrective action plan, please contact me at <br /> 717-656-2300, Ext. 1812. <br /> Sincerely, <br /> r <br /> Amy L. Doup6, B.S. <br /> Senior Specialist <br /> Quality Assurance <br /> ALDlmcs <br /> Enclosures <br /> Lancaster Laborawries. Inc. <br /> 2425 New Holland Pike <br /> PO Box 12425 Shipping Address: <br /> M L'® <br /> Lancaster.DA 17605-1425 Lancaster iaborataie3.Inc. <br /> 717-656,2300 Fax-717-656-268) 1.425 New Hotland Pike Environmental•Pharmaceuticals <br /> www.tanc,Asterkabs.com Lancaster.PA 17601 <br />