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5E�1TI' BY-EICON- r9 <br /> -18-96 ,,2'SIPM EkCON'SAC AAEKIt4 w `"~.#� WI 14 <br /> +k •y 5 <br /> ^+ lt' p� 5 z�'t � ` st> -0" f y}, ',y��,x,.,jy, a' .s.,,Ct i{� � �`��i�ts 'r4 +�Y-„ ..�r ff` '�>�i�(�'+ 5'� '+t•,,Rr <br /> "$.� s,5y - {• �s•�� }r (rT'.h � k � °� 3" fz 1u` <br /> xW �vr3�E :.. .i,�„ .F a <br /> .4 ny <br /> R °�y }; +,.., ., h ■ .of:. <br /> lulr:l awre ice H.Beasley. `Fro*; P96;070.25 <br /> July 18,M6 <br /> Page2' ° » <br /> F5 Y y t <br /> )y A <br /> n � <br /> S6OPEb0 WORK <br /> � +s�, t�mia� �S�Sn�'�a.- . h �5'^i . , � «fes re i e, `��,,��`i M i � �Ks"+v' Y��•'r°� '+v. <br /> EMC`QN h apxcparcd, the following ;cap,_ off workTto-, coniplet�e the �iequuemenrs, _ (' <br /> assotiatod with,the prof ct objectives: Work will be perfontigd,following RWQM%7s i <br /> Regional-Guidelines. The RBCA evaluation will be conducted in accordam;,with [ASTM's] _ <br /> ES-3$`wide for Risk-Based Corvc iv�e Action Applied at Petro um Release Sfts,"as weR, <br /> as California Environnioual�Fmtection'Agency(Cal-EPA) and U.S.Errvhntarieaital Prot ion <br /> -Agm-y(USEPA) guidaru-e.pnncipally USEPA's "RA Assmsment Guidance for Supafiuid” , <br /> (RAGS) The scope of work can be subdivided into four pnwnpal tasks as indicated below. <br /> Task 1 - Pre-Field Activities <br /> EMCON will pertorin a file review at the SJCPHS to obtain data gathmd from previous <br /> investigations, which wdl be used to fulfill closure requiretnents This information will also <br /> be used to define the proposed field adivittes. In addition, EMCON will conduct a <br /> 1/2-mile-radius well survey at the DWR to identify=sidve receptors <br /> EMCON will prepare a workplan describing the proposed work for agency review and <br /> approval.The workplan will adhere to Appendix A of the Th Regional Gtuddtnes and will <br /> . iin:lude a site-speck Health and safety plait and project schedule. General explurutory <br /> boring procedures will be contained as attachments to;the workplan.~ <br /> Following approval of the workplan by the RWQCB and the SJCPHS,EMCON will obtain <br /> the appropriate drilling permits from the SJCPHS Permits can take 2 to 4 weeks to obtain. <br /> Task 2-Sall Boring , <br /> EMCON will contract a 6=sed will driller to drill two exploratory soil borings in order to <br /> evaluate eurreW(post vapor-extraction) hydrocarbon concentrations and obtain geotechnical <br /> data on subsurface soil. Based on conversation with Ron Rowe of the SJCPHSD,one location <br /> is proposed to be located east of VEW and the second boring north of Mme/-5.To expedue field <br />' work and to ehmwte a city right-of-way pem*, the proposed boring east of VEW will be <br />' low withal the structure.The proposed boring north of MW-5 will a6o require access within <br /> i the structure Actual bcitions may require modification once historical data have been <br /> thoroughly reviewed. Exploratory Wrings will be drived ubmg 8-inch-dater hollow-stem <br /> augers. The boring will be dnllod to first-encountered groundwater'(approxin itely fit} feet <br />_ below ground surface I Sort borings will be bac riled with a uennewbentoiute shury. <br />} <br /> i <br />