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' Mr Ronald Rowe <br /> November 3, 1998 <br /> Page 4 <br /> Groundwater Sampling TM <br /> p g Ana!ytical Results. HydroPunch and well samples were analyzed <br /> for TPH-G, BTEX, and oxygenates Results of both HydroPunchTM and well samples identified <br /> detectable concentrations of benzene and TPH-G in all of the wells sampled (Tables 3 and 4) In <br /> well samples, benzene concentrations ranged from 8 3 to 2,000 micrograms per liter (µg/L), <br />' while TPH-G concentrations ranged from 1,100 to 5,500 gg/L Methyl-t-butyl ether (MTBE) <br /> was the only oxygenate identified, and was detected in the well sample from MW-1 (9 7 pg/L) <br /> HydroPunchTM results are summarized in Table 3 A summary of Instoncal analytical <br />' groundwater results are summarized in Table 4 <br />' Conclusions <br /> The site is underlain by interbedded silts and sands Based on the absence of petroleum <br />' hydrocarbons in the current three borings, and results from previous investigations, impacted <br /> soil is localized in the vicinity of MW-1 <br /> Depth to water measurements indicate a very flat gradient and a variable groundwater flow <br /> direction Groundwater chemical data indicate higher concentrations of benzene and TPH-G in <br />' well MW-3 than in MW-2 or MW-4, indicating a prevalent groundwater flow direction <br /> Based on the groundwater chemical and gradient data, the extent of the petroleum hydrocarbon <br /> plume can be estimated to extend further to the south of MW-3 as shown in Figure 1 <br /> 5 <br /> If you have questions or comments, please call me at (916) 444-0123 <br /> Sincerely, <br />' BROWN AND CALDWELL <br />' Tina M Bauer Jay Lucas, R G <br /> Project Manager Principal Geologist <br />' TMB jw <br /> cc Mr Terry Tardi ti, T&T Trucking, Inc <br /> Use or disclosure of data continued on this sheet is subject to the restriction specified at the beginning of this <br /> document <br /> BCSAC0111600011627 MELLiNST DOC <br />