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V { Supplemental Investigation Work Plan BP Oil Site No. 11193 C A M B R I A Stockton, California �^ February 25, 2000 1 To further evaluate this well,pumping data and analytical results will be requested from Caltrans. If afialytical results are not available, samples will be collected and analyzed-for TPHg, BTEX and' MV 18E using the methods described above. SJCEHD assistance with Caltrans contact information will facilitate acquisition of the well data and, if needed, access to the well for sampling. i In addition, fate and transport modeling will be performed to evaluate the potential for BTEX and i 1 MTBE migration to the well. We will use the AT123D model modified for input of source concentrations rather than a mass loading. jhput-parameterswill be estimated from the previous hydraulic testing, groundwater monitoring and other available data. a Hydrocarbon and MTBE Mass Estimates The mass of hydrocarbons and MTBE remaining beneath the site will be estimated using an assumed soil bulk density of 1.4 kg/l, an effective porosity of 0.3,a gasoline specific gravity of 0.80,a MTBE specific gravity of 0.74, and the volume of hydrocarbon or MTBE-bearing soil and groundwater. 1 These volumes will be estimated based on the previous work at the site and the results of the investigation activities described herein. Reporting After the analytical results are received, a investigation report will be prepared that, at a minimum, i will contain: j • Descriptions of the drilling and soil sampling methods, 1 • Boring logs and well construction details, a • Tabulated soil analytical results, • Analytical reports and chain-of-custody forms, • Caltrans well assessment results, } Estimates of the hydrocarbon and MTBE mass remaining, 1 • Soil and water disposal methods, and , 1 � • Conclusions and recommendations. i i ! t 8 1