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s � <br /> 11. Page 4-5, Section 4 .2 . 4 , Paragraph 1 <br /> In the text, explain how the California site mitigation <br /> decision tree will be used. <br /> 12 . Page 4-5 , Section 4 .2.5, Paragraph 2 <br /> Explain in the text how the ground water OU #1 risk <br /> assessment is appropriate to consider in the Comprehensive <br /> RI/FS BRA. Discuss also specific examples of how the OU #1 <br /> BRA will not address all contamination at DDRW-Tracy. <br /> 13 . Page 4-5, Section 4 .2 . 5, Sentence 3 <br /> This sentence is incorrect. The draft BRA for OU#1 provides <br /> data that indicates Well 7 , the well that furnishes drinking <br /> water and washing water to DDRW-Tracy is contaminated with <br /> arsenic and mercury. <br /> 14 . Page 4-5 , Section 4 .2 . 5 , Paragraph 2 <br /> The "key features and conclusions" from the OU #1 BRA should <' <br /> not be presented in this work plan because they have not <br /> been verified nor agreed to by the EPA. Additionally, these <br /> items have the potential to prematurely limit and narrow the <br /> sitewide comprehensive investigation. Delete these features <br /> and conclusions. <br /> 15 . Page 4-7 , Section 4 . 3 <br /> Please state the intent of Phase I sampling specifically <br /> related to the BRA. <br /> 16. Page 4-11 , Section 4 . 5 <br /> This heading should read "refine the conceptual site model . " <br /> 17 . Page 4-15 , Section 4 .5.2 . 6. 1, Paragraph 1 <br /> State the depths of the soil samples that have shown no TCE 4E7� <br /> or PCE contamination above 1 ppm. <br /> 18. Page 4-17 , Section 4 . 6. 5 <br /> List all additional chemicals of concern listed in the <br /> Federal Facilities Agreement (FFA) in section 4 . 6. 5. <br /> 19 . Page 4-18 , Section 4 . 6 .7 Bullet 2 <br /> What statistical method will be used to confirm whether a <br /> chemical is at or below background? Explain in the text. <br /> II-4 <br />