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' Morita19 November 6, 1992 Brothers Service Station TABLE 4 Analytical results expressed in milligrams per kilograms (ppm) Boring No Depot TPPHBenzene Toluene Ethyl- Total Total Gasoline benzene Xylenes Lead ' Mw-1 5 5' ND ND ND ND ND 8 1 MW-1 65' 1 ND ND ND ND 5 8 MW-2 5 5' ND ND ND ND ND 6 5 MW-2 6 5' ND ND ND ND ND 7 8 MW-3 55' ND ND ND ND ND 7 8 MW-3 65' ND ND NDND ND 5 2 MRL NA 1,0 0 005 Q 005 0005 001 2 5 AL NA 100 067 1 0 30 20 511000 ' ND None Detected at or above mYn inum reporting level (MRL) NA Not Applicable A L Regional Water Quality Control Board recommended guidelines for concentrations in soil Recommended guidelines were calculated using the LUFT methodology by multiplying the most stringent current federal or state water quality standards by a factor of I00 to account for attenuation clue to soil composition and distance from groundwater ' 4.4 Analytical Results-Groundwater Total Purgeable Petroleum Hydrocarbons as gasoline (TPPHg) were detected in the iwater samples from all three monitoring wells, and were not detected in either the travel blank, or the field blank TPPHg was detected in monitoring well MW-1 at a concentration of 60 ug/L, MW-2 at 470 ug/l, and MW-3 at 550 ugll 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/1 in MW-1, 236 ugll in MW-1, and 72 ugll in MVV-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