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11. A comprehensive examination of semi-volatile organic <br /> compounds (SVOCs) was not undertaken during this round of <br /> quarterly monitoring nor is it evident as having been <br /> accomplished during past monitoring episodes. <br /> • DDRW-Tracy must use EPA Test Method 8270 to accomplish <br /> this versus Method 8250 due to the lower achievable <br /> Practical Quantitation Limits (PQL) for most compounds. <br /> 12 . TOC analyses can be used as an indicator of semi-volatile <br /> and non-volatile organic contaminants derived from petroleum <br /> products. <br /> • Please explain why water quality analyses for indicator <br /> compounds such as Total Organic Carbon (TOC) , Total <br /> Organic Halogen (TOX) and sulfates, among others, were <br /> not performed. <br /> 6 <br />