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REnledlatlon Plan <br /> Cleanup and Abatement Order No 5-00-707 EAI Proll-ct No 1232 <br /> 4.0 SUPPLEMENTAL SITE ASSESSMENT <br /> A Supplemental Site Assessment consisting of advancing two 150-foot deep CPT borings, one <br /> on Unocal site and one on the Wards site, and to install one nested ground water well on the <br /> Wards site, is proposed The CPT work is necessary to determine if a clay layer encountered <br /> during CPT work near the RIW at about 110 feet bgs is laterally extensive and present beneath <br /> the Unocal and Wards sites (see EAI, 2000B) The nested well proposed for the former Wards <br /> site is the same nested well proposed for the site in EAI, 2000B, but never installed due to <br /> Wards filing for bankruptcy <br /> Figure 13 shows the approximate location of the proposed CPT borings and the nested well It <br /> is proposed that the CPT work be completed first, and then the nested well installed <br /> immediately after completion and evaluation of the CPT work Based on the assumption that <br /> the clay layer encountered near the RIW will be encountered beneath the Wards site, proposed <br /> nested well MW-8S/D will be slotted between approximately 85 and 90 feet bgs, and 100 to <br /> 105 feet bgs We have assumed that as with the CPT work previous completed near the RIW, <br /> staff of the RWQCB will be on-site during this CPT work to observe the work and confirm the <br /> proposed nested well design Should unexpected site conditions be encountered, the <br /> construction details for the nested well will be modified, with RWQCB assistance and <br /> approval <br /> i <br /> 1 <br /> 1 <br /> r <br /> BS 1232P RAP ADD -!- � <br /> ENVIRONMENTAL AUDIT,INCA <br />