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December 4, 2005 4088053170 01 Mr. Jeff Wong San Joaquin County Page 3 Northwest Corner MACTEC proposes the installation of three soil borings(B-19 B-20, and B-21) in the northwest corner of the Site (Figure 2). All three of these borings will be,ladvanced to water and groundwater samples will be collected. The samples from this area will be analyzed for total petroleum hydrocarbons as gasoline(TPHg) using EPA Method 8015M, for benzene,toluene, ethyl-benzene, and total xylenes(BTEX)using EPA Method 8020M, and for 4-Methyl-2-Pentone(MIBK)using EPA Method 8260. I J Southwest Corner j MACTEC proposes the installation of three soil borings(B-22 B-23,B-24) in the southwest corner of the Site(Figure 2). All three of these borings will be advanced,to water and groundwater samples will be collected. ' The samples from this area will be analyzed for TPHg and TPHd using EPA Method 8015M with silica gel cleanup (EPA Method 3630C)to remove naturally occurring polar hydrocarbon compounds from the diesel analysis, and for BTEX using EPA Method 802i0M. ' Southeast Corner MACTEC proposes the installation of six soil borings(B-25 though B-30) in the southeast corner of the Site (Figure 2). The three borings located in the identified downgradient positions(B-25,B-26, and B-27) of the previously installed soil borings B-11,13-14, and B-15 will be advanced to water and groundwater samples will be collected. The samples from this area will be analyzed for TPHd using EPA Method 8015M with silica gel cleanup (EPA Method 3630C). j Upon conclusion of the boring program,the temporary wells will be removed and all boreholes will be backfilled to the surface with grout. Samples will be collected using our standard field protocols that have been accepted by the regulatory agencies,and transported under chain-of-custody to a State- certified laboratory for chemical analysis. Soil generated from)utility clearing activities and rinsate water will be stored onsite, in separate,DOT approved 55-gallon drums pending analysis and proper i disposal. i. Report Following completion of the field work and receipt and review',of the sample analytical results, MACTEC will prepare a written letter report that summarizes our field observations and sampling `i i i