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Ms. Katie Hower SECOND DRAFT <br /> Chevron Pipe Line Company <br /> 24 January 1997 <br /> Page 7 <br /> groundwatersites, Stability of <br /> biedeb. ........n .s ueci-vim <br /> In summary, the following analytical suite is recommended for Old Valley Pipeline sites: <br /> Reportin <br /> Measurements Methods Purpose Limits= <br /> • Soil Samples <br /> BTEX 8020iS /RAA4 5fflef t 0.005 me/ke <br /> PNAs 8310/8270 SI/RAF' '- assessor-e�t <br /> .-.�.,n„� vari u <br /> TEPH(C8-C36) 8015M w/crude std -s-ISereen+ng-too! 10 <br /> Fingerprint GC-FID As necessary N/A <br /> • Groundwater Samples <br /> BTEX 8020 WQOsLR—Af iak4ssevAuviA 0.5 ue/1 <br /> PNAs 8310/8270 WQOs/RAri&k,� various <br /> TPPH(C4-C 2) 8015 w/gasoline std WQOs U-"/—] <br /> TEPH(CIO-C24) 8015M w/diesel std WQOs 50 1 <br /> SI=site investigation RA=risk assessment WOO=water quality objective(Reion 5) <br /> For undiluted samples with no matrix interferences <br /> COMPARISON OF SITE DATA TO RWQCB "LOW RISK CRITERIA" <br /> Site data will be compared to the draft RWQCB "Low Risk Criteria" (RWQCB, 1996), or <br /> applicable updates, to determine an appropriate reme ial managemestrategy or request <br /> closure. Based on previous experience, Old Valley Pipeline sites are typically a hybrid <br /> between a vadose zone case and a groundwater case as defined in the RWQCB criteria because <br /> the petroleum has reached the water table, but groundwater is minimally impacted 12y <br /> dissolved constituents (if at all). Because Old Valley Pipeline "soil-only"cases will be <br /> handled by the County (see Step 2), cases handled by RWQCB will be defined as "ground- <br /> water" cases. Closure request documentation will conform, as applicablea P"ffiate, to <br />