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f <br /> borings have penetrated to 65 feet, and many have met re sal at around 50-feet bgs. An additional well <br /> screened 80- to 90-feet could be located in the source area adjacent to DMW-5 and DMW-6. However, <br /> analytical data from these wells shows an order of magnitude decrease in 1,2-DCA concentration from the <br /> 32- to 52-feet bgs screened depth of DMW-6, to the 51- to 71-foot screened depth of DMW-5. <br /> Concentrations of 1,2-DCA are currently less than 1 µg/L in DMW-5 and show a strong declining trend, <br /> suggesting that the vertical extent is effectively defined by DMW-5. URSfeels that the extremely low <br /> 1,2-'DCA concentrafion at b7V1W-5, together with the`data from DMW-8, a`re -sufficient toTdemonstrate <br /> that the veifical extent.iT fined as"above 71 feet bgs, and that°an additional well atahis location is not be <br /> warranted. <br /> If you have any questions or need additional inform tion, please do not .hesitate to call me at <br /> (916) 812-8037. <br /> Sincerely, <br /> 1 <br /> URS Corporation <br /> Anthony Mindling,R.G. <br /> Attachment:Figure 1 <br /> I <br /> URS Corporation <br /> 2870 Gateway Oaks Drive,Suite 300 <br /> Sacramento,CA 95833 <br /> Tel:916.679.2200 <br /> Fax:916.679.2900 <br />