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. 21, <br /> �= <br /> V0 <br /> r'' .._- - :> .r�'•.,``. e ' `=.a+.t r-6° ". ". c...w�•.. ^'..'sS. Ft4et'ac rge�rr' u':� .�. '' , � <br /> .s4 ' <br /> k_ <br /> "7m <br /> Mr.R. R, Zielinski 202/150-4150 <br /> March 19, 1991 Page 3 <br /> The water samples were analyzed using modified EPA methods 5030/8020/8015, which measere <br /> concentrations of total petroleum hydrocarbons-as-gasoline(CPH-G),and benzene,toluene,ethylbenzene, <br /> and xylenes(STEX). Copies of the laboratory analysis reports and chain-of-custody manifest are presented <br /> In Attachment IL <br /> GROUNDWATER ANALYTICAL RESULTS <br /> Concentrations afi TPN-Gin the groundwater samp'es.ranged from 640 parts per bilpori rppb)-#o 154,000 ppb; <br /> higher revels than'thase_reporte for_the..previous.gt rter; ;Tf H:G concentrations In groundwater for <br /> F�rtiary 3, 1991 are shown in Figure 2. The benzene concentrations ranged from 2 to 25,000 ppb. <br /> Benzene concentrations in groundwater for the same sampling event are shown In Figure 3. Results of the <br /> analyses are presented In Table 2 (Attachment lil). <br /> Please contact Groundwater Technology's West Sacramento Office if you have questions or comments <br /> regarding this quarterly report. <br /> Sincerely, <br /> GROUNDWATER TECHNOLOGY,INC. <br /> MARTIN J. O TENDORF <br /> Senior Project Geologist <br /> JOHN E. BOWER <br /> Environmental Geologist <br /> Project Manager <br /> E. K. SIMONISpQg(Et)) <br /> California Registered iu a S <br /> Geologist, No.442' No.4422 <br /> MJO/JES/EKS:rc <br /> Attachments y <br /> ATF t7F cft'F`'' <br /> ,��',GH0U1UL5/1TEH <br /> Uci1K{)mjcy.I1c. <br />