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• information on that method is included in Appendix B - the amendment to the quality assurance project plan (QAPP). PAHs, as well as some dioxins and furans, may be present at burn pits. Method 8270 provides inadequate detection limits in groundwater for risk assessment purposes. (All of these analytes were detected during the August 1991 excavation of some apparent burn pits prior to building the Subsistence Warehouse at the southern end of DDRW-Tracy, including solid waste management unit (SWMU) No. 13.) • Please correct this oversight. 57. Table B-13A lists only EPA Method 8280 for dioxins and furans in the soil matrix, although EPA Method 8290 is also to be used in soils. • Please list detection limits for dioxins and furans in the soil matrix utilizing EPA Method 8290. 58. Page B-13, Section B.8.2.0 The Work Plan does not contain any description of the calibration procedures to be followed for the various methods in Table B-B-2A other than a reference to the fact that either the EPA method will be followed or that the laboratory quality assurance plan will be followed, which ever is more stringent. The Work Plan should define calibration requirements for the different methods, since the EPA methods often are interpreted differently by different laboratories, and a consistent comparable approach is important to the generation of quality data. This lack of uniformity may even apply to two laboratories in different locations within the same organization. It is recommended that, at a minimum, the quality control requirements and especially acceptance criteria for calibration for each method be summarized (for example in a table) for each of the methods which will be used in the project. This will help ensure a more uniform product and guard against problems which might occur if the laboratory is changed during the course of the study. 59. Amendment to Field Sampling Approach, Table 3.3-9, Specified Analytical Methods for Soil and Groundwater; Amendment to Quality Assurance Project Plan, Table 13- 2A, Analytical Method References for DDRW-Tracy; Table B-15A, Method Reporting Limits Miscellaneous Parameters Regional guidance requires that where modifications to EPA methods will be used, or where methods which will be used are not readily available, that copies of these methods or a laboratory standard operating procedure (SOP) be provided for review. Several of the analyses in this table fall in this category. Specifically, both EPA Methods 632 and 300.0 are water methods which must be modified for the analysis of solid material. The most current version of EPA Method 300.0 is August, 1991. The reference in the table is incorrect and should be changed. EPA Method 8015 is to be modified using a laboratory approach for the analysis of ethylene glycol and total petroleum hydrocarbons. State of California.methods, such as those cited for USEPA/R9 12 Apr 93 12/19