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Supplemental Investigation Report,Problem Assessment Report and Work Plan <br /> Cleanu and Abatement Order Na 5-00-707 EAI Proect No 1232 <br /> 6.4 Final Selection of Remedial Alternative(s) <br /> The final selection of a remedial alternative(s) will depend on the results obtained from <br /> completing the additional investigation work outlined in Section 5 0 However, at this time, <br /> data are sufficient to recognize that remediation of ground water beneath the Unocal site <br /> (southern area) near existing Unocal wells MW-1 1, MW-12 and MW-19 will be required (see <br /> Figure 4) Further, the results of the additional assessment work to be completed at the Unocal <br /> site will determine if remediation in the area between former Unocal well MW-1 and existing <br /> ' Unocal well MW-11 (center area) also will be required <br /> The area near the R1W also may require remediation, depending upon the results obtained from <br /> completing the CPT work (see Section 5 2), and remediation of the Wards site will continue <br /> using the existing remedial system (see Section 2 2 3) <br /> 1 <br /> 6.5 Interim Remediation — Unocal Site <br /> As an interim remedial measure, it is recommended that existing Unocal wells MW-11, <br /> MW-12 and MW-19D (see Figure 4) be connected to the Wards treatment system Wells MW-11 <br /> and MW-12 will be used as vapor extraction wells and well MW-19D as an air sparging well <br /> The main problem, which we have already preliminarily discussed with the City of Stockton, is <br /> t the City's concern regarding installing conveyance piping beneath Robinhood Drive <br /> However, it is EAI's opinion that this issue can be resolved and a permit issued by the City for <br /> the installation of conveyance piping beneath Robinhood Drive As an alternative, and <br /> assuming that remediation in the center area of the Unocal site will not be required, <br /> biosparging, which requires only the use of an air compressor, can be implemented <br /> I It should be noted that if remediation is determined to be warranted in the center area of the <br /> Unocal site, it is doubtful that the Wards system could be used A separate system, located on <br /> �l <br /> the Unocal site, probably would be required <br /> �I <br /> i <br /> i <br /> 1� <br /> BS I232P[RW-WP -22- <br /> ENWRONMENTAL AUD,1T,INC <br />