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25. Section 2 . 2 . 7 . 1, Page 2-16 <br /> This text states that the purpose of OU-1 is only to address <br /> TCE and PCE contamination. <br /> • Revise text to reflect that all organic chemicals of <br /> concern will be addressed in OU-1. <br /> 26. Section 2 . 2 .7. 1, Page 2-16 <br /> The sentence "there is no requirement for an environmental <br /> protection remedial action objective for ground water. " is <br /> unclear. <br /> • Modify the text to more clearly explain what is meant <br /> in this sentence. <br /> 27 . Sections 2 . 3 . 2 . 6 and 2 . 3 .2 . 7 , Page 2-17 <br /> The text in these two sections does not indicate clearly <br /> that OU-1 is addressing all ground water at DDRW-Tracy. <br /> Please modify the text in these sections so it is clear <br /> that OU-1 is addressing all ground water. <br /> 28 . Section 2 . 3 . 3 . 2 , Page 2-18 <br /> Average weighted soil porosity in Appendix Q is 25 percent <br /> and calculations are based on that value. The text states <br /> that the average weighted soil porosity is 33 percent. <br /> Using an average weighted porosity of 33 percent and the <br /> equation given in Appendix Q results in an estimated <br /> groundwater volume of 1.7 billion gallons. <br /> • Please clarify which porosity value is correct and make <br /> emendations as necessary to this section. <br /> 29 . Section 2 . 3 . 3 . 2 , Page 2-18 <br /> At the accepted conversion value of 43 , 560 square feet per <br /> acre, 17 million square feet returns a value of 390 acres. <br /> Please correct the calculation. <br /> 30 . Section 2 . 3 . 3 . 3 , Page 2-18 <br /> How were the potential dissolved phase contaminant <br /> quantities of TCE and PCE estimated? No explanation or <br /> justification has been provided. <br /> 31. Section 2 . 4 . 2 . 4 . 1, Page 2-26 <br /> 8 <br />