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December 1995 Quarterly Groundwater Monitoring Report
Appendix A - Quality Assurance Summary Report for Aqueous Samples Collected from CSSA, December 1995 and January 1996
Introduction (December 1995)
This report discusses the findings of the Quality Assurance (QA) review of the analytical data submitted in support of the samples collected by Parsons ES at the Camp Stanley Storage Activity site in Boerne, Texas during December 1995. The samples collected included quarterly groundwater samples and associated field quality control samples.
The samples collected were analyzed for volatile organics (VOCs) and metals. All analyses were performed by Chemron Incorporated of San Antonio, Texas following the analytical methods specified in the project work plans. Field quality control samples collected in support of the samples included: two trip blanks, one equipment blank, and one field duplicate. Sample D-1 is a duplicate of the Well 2 sample. The trip blanks were analyzed for VOCs only, the other quality control samples were analyzed for the same parameters as the associated samples. Samples from Well 3 and Well 4 were analyzed as matrix spike/matrix spike duplicate (MS/MSD) samples.
The data package submitted by the laboratory has been reviewed using the QA Objectives specified for the project and standardized data validation procedures. This report discusses any deviations from the QA objectives and any limitations on the usability of the data resulting from these deviations.
Summary
Generally, the samples were successfully analyzed as required for the project. All samples were prepared and analyzed within the specified holding times. Except as indicated in this report, the data as submitted by the laboratory is usable as reported.
Target VOCs detected in the groundwater samples included: cis-1,2-dichloroethene, tetrachloroethene, chloroform. The laboratory, trip and equipment blanks associated with the VOC analyses were free of contamination. The MS/MSD and laboratory control samples (LCS) associated with the VOC analyses were also acceptable. No target VOCs were detected in either duplicate sample. The laboratory reported no problems associated with the VOC analyses.
Target metals detected in the groundwater samples included: arsenic, barium, lead, copper, cadmium, and zinc. The laboratory and equipment blanks associated with these samples were free of metals contamination. The MS/MSD samples were in compliance.
Very poor precision was observed between results for the field duplicate samples (well 2 and D-1). Target metals arsenic, barium, cadmium, chromium, copper, lead, and nickel were detected in sample Well 2 but were not detected in the duplicate sample (D-1). Also, the level of zinc in Well 2 (330 ug/L) is significantly higher than the level in sample D-1 (40 ug/L). The results reported for the duplicates may be indicative of sampling or matrix variability. The samples affected were resampled and reanalyzed. The results for the recollected samples (for metals analysis only) are discussed in the January 1996 QA Summary Report.
Introduction (January 1996)
This report discusses the findings of the Quality Assurance (QA) review of the analytical data submitted in support of the samples collected by Parsons ES at the Camp Stanley Storage Activity site in Boerne, Texas during January 1996. The samples collected included quarterly groundwater samples and associated field quality control samples.
The samples collected were analyzed for metals only. All analyses were performed by Chemron Incorporated of San Antonio, Texas following the analytical methods specified in the project work plans. Field quality control samples collected in support of the samples included: one equipment blank and one field duplicate. Sample D-1 is a duplicate of the Well 2 sample. Sample Well 10 was analyzed as the matrix spike/matrix spike duplicate (MS/MSD) sample.
The data package submitted by the laboratory has been reviewed using the QA Objectives specified for the project and standardized data validation procedures. This report discusses any deviations from the QA objectives and any limitations on the usability of the data resulting from these deviations.
Summary
Generally, the samples were successfully analyzed as required for the project. All samples were prepared and analyzed within the specified holding times. Except as indicated in this report, the data as submitted by the laboratory is usable as reported.
Target metals detected in the groundwater samples included: arsenic, barium, lead, copper, cadmium, and zinc. The laboratory and equipment blanks associated with these samples were free of metals contamination. The MS/MSD samples were in compliance.
Arsenic and copper were detected in the field duplicate sample (D-1) but were not detected in the original sample, Well2. Reported results for these metals in the duplicate samples should be considered estimates and indicative of sampling or matrix variability.