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C A M B R I A southeast dispensers If field observations or photo-ionization detector readings indicate petroleum hydrocarbon presence in soil beneath other areas within the UST excavation, dispensers, or piping, additional soil over-excavation may be performed A Cambria geologist will be onsite to direct the excavation contractor in the removal of soil, to collect soil samples, and to document field observations Cambria will terminate over-excavation when there is no evidence of petroleum hydrocarbon presence, when groundwater is encountered, or when the structural integrity of existing site features is compromised The extent of over- excavation will be determined in the field by the Cambria geologist Confirmation soil samples will be collected when over-excavation is complete If groundwater is encountered, Cambria will collect soil samples from the excavation sidewall dust above groundwater and will collect a grab groundwater sample Chemical Analysis The samples will be analyzed for TPHg and total petroleum hydrocarbons as diesel (TPHd) by EPA Method 8015 (modified), benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary-butyl ether (MTBE) by EPA Method 8020, and fuel oxygenates (TBA, MTBE, ETBE, DIPE, and TAME) by EPA Method 8260 These samples may be analyzed on a rush turn around time so that the tank pit and other excavated areas can be backfilled as soon as possible Soil Stockpile Sampling Soil generated during over-excavation activities will be stockpiled onsite Cambria will collect one composite sample (consisting of four discrete sub-samples) for every 250 cubic yards of soil generated as required for disposal at Forward Landfill, Inc 's Manteca, California landfill Report Preparation Cambria will include a discussion of over-excavation activities and sampling results in our Tank Removal Report This report will be submitted after Cambria receives all the analytical data relating to the tank removal and over-excavation activities SCHEDULE K E Curtis Construction Company, Inc of Lathrop, California would like to have the soil generated during the UST removal activities removed from the site prior to starting over- excavation activities The soil removal should be complete by the week of July 19, and we would like to begin over-excavation no later than the week of July 26, 1999 We will . implement this scope of work as scheduled when we have received approval from SJCPHS 241-1399 3