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Ms. Katie Hower SECOND DRAFT <br /> Chevron Pipe Line Company <br /> 24 January 1997 <br /> Page 4 <br /> 3. If grab-groundwater sample results meet or exceed WQOs,the site will be identified-aa <br /> a"groundwater"caseand*'•n n-4etem4ae the lateral and vertical extent of dissolved <br /> petroleum in groundwater will be determined using eigie -a screening method_-er <br /> monitoring as nn <br /> ....,...� <br /> 4. r" Mmonitoring wells will be installed as per the distribution of dissolved <br /> petroleum identified by the screening data and a quairerlyand implement a monitoring <br /> program will be implemented... .... nt.n n 1' .. .n nonbil <br /> 5. Assess-Tthe potential risk to human health posed by the affected soil and groundwater <br /> will be assessed under appropriate land use scenarios. <br /> 6. After four quarterly-monitoring events, eempare-site data will be compared to RWQCB <br /> draft"Low Risk Criteria" (or applicable updates) for appropriate remedialmanageEnent <br /> strategy or site closure. The four quarterly monitoring-events may incorporate <br /> historicalexisting data, if such data represent seasonal changes and water level <br /> fluctuitions.nn np� a pliea' <br /> ANALYTICAL SUITE <br /> As discussed earlier, the petroleum associated with the Old Valley Pipeline is a degraded crude <br /> oil and/or Bunker C fuel oil that is composed primarily of a broad range of medium-to high- <br /> boiling petroleum hydrocarbons. In some cases, it may be necessary to fingerprint the material <br /> present to further evaluate that it is Old Valley Pipeline product. The purpose of collecting <br /> samples for chemical analysis is to evaluate the potential threat to groundwater or risks to <br /> human health posed by the residual petroleum. Accordingly, the analytical suite will be <br /> focused on providing data appropriate for that purpose. The measurement of BTEX and PNAs <br /> is important for both protection of groundwater and human health. BTEX and the low <br />