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�� <br /> �jcN^d/`l <br /> lithology encountered in the boring for DMW-10. The r ised location of DMW-11, together with the <br /> proposed locations for DMW-10, DMW-12, and DMW-13 e shown on Figure 1. <br /> Regarding a direct-push boring to the 80- 90-foot de th ra in the source area, experience has shown <br /> that the depth of penetration of direct pus at this site is problematic. Only two have penetrated to 65 feet, <br /> and many have met refusal at around 50 feet bgs. Although site data suggests order-of-magnitude decline <br /> in concentration with dLe <br /> the urce area, comments provided by SCEMD in our telephone <br /> conversation on Februar008, i dicate that a non-detect result would provide better evidence of <br /> vertical delineation and s ongly supportive of cllsure. URS therefore proposes to include a <br /> fourth monitoring well, 4 ] ated.near t_he,source,area,a_nd_to,be;screened I in_the_80_to 100- <br /> ,tfoomterval-based on lith6I countered. <br /> All five of the proposed wells are shown on the attached Figure 1. Construction of the wells would be as <br /> provided in our October 22, 2007 work plan. <br /> If you have any questions or need additional informat on, please do not hesitate to call me at <br /> (916)812-8037. <br /> Sincerely, <br /> URS Corporation <br /> lr��tl <br /> Anthony Mindling, R.G. <br /> Attachment: Figure 1 <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 />