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Monta Brothers Service Station 19 Novctubor 6, 1992 1i tj r i 1`A, ` V \� TABLE 4 Analyticdl results expressed in milligrams p kilograms (ppm) BQrj Depth TPPH B- c—n?encT�?1� h 1- Total Gasoline t i •nz ne X lenes t. edcl MW-1 55' ND ND ND ND ND $ 1 MW-1 65' 1 ND ND ND ND 5 8 MW-2 5 5' ND ND ND ND ND 6 5 MW-2 65' ND ND ND ND ND 7 8 MW-3 55' ND ND ND ND ND 7 8 MW-3 65' ND ND ND ND ND 5 2 MRL NA 1 0 0 005 0 005 0 005 0 0 1 2 5 A L NA10 0 067 1 0 3 0 2 0 511000 ND None Detected at or above minimum reporting level (MRL) NA Not Applicable A L Regional Water Quality Control Board recommended guidelines for -once utration% in soil Recommended guidelines were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality i tandards by a tactor of 100 to ai-c,ount for attenuation due to soil composition and distance trout groundwater 4.4 Analytical —Resu Its-Grgu ndwd ter Total Purgeable Petroleum Hydrocarbons as gasoline (TPPHg) were detected in the water samples from all three monitoring wells, and were not detected in tither the travel blank, or the field blank TPPHg was detected in monitoring well MW-I at a concentration of 60 ug/L, MW-2 at 470 ug/1, and MW-3 at 550 ug/I No volatile aromatics were detected in MW-1 Benzene was detected in MW-3 at 19 ug/L No other volatile aromatics were detected in MW-2 and MW-3 TRPH as oil and grease were not detected in the water samples from the monitoring wells Total lead was detected at 238 ug/l in MW-1, 236 ug/i in MW-1, and 72 ugll in MW-3 Soluble lead was not detected in these three samples Copies of the analytical reports and chain of custody document are included as, Appendix D Table 5 presents a summary of the analytical results for TPPH as gasoline, the volatile aromatic hydrocarbons, TRPH as oil and grease, and total lead in water samples analyzed during the groundwater assessment ' EB-8101-3 9210-EO55 RPT