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III I„I , I I I V lu II II IIi IlPli I I Ih li II I, I` e0 I 11 I n' , 1 t IIII III ICI ' - x>• c a s - �— i 3 Y9w ins wx<ar`7�h{i�I�II''�*Il�hiw.�°-µr w ,w k „n u II i 1 I I I I . Project No S8080-06-03 February 16, 1996 �I { Page 3 1 11 1 FINDINGS ' I Groundwater Elevations_ A review of the last reported groundwater level measurements performed in December ' 1995, indicates that groundwater levels have risen an average of 0 73 feet in the last four weeks to depths ranging from 50 94 to 53 47 feet below TOC The direction of groundwater + flow beneath the site on January 11, 1996 was to the south-southwest Groundwater elevation contours are depicted on Figure 2 Analy1ical Results A cumulative summary of groundwater analytical data is presented on Table II TPHg was detected in only MW-3 at a concentrations of 370 ug/L MTBE was detected in wells MW- 1, MW-2, MW-3 and MW-5 at concentrations of 920, 14, 110 and 670 ug/L, respectively �� Benzene was detectedZetectable ' wells MW-1, MW-3, MW-4 and MW-5 at concentrations flanging from 12 to 2 6 ug/L MTBE concentrations ranged from 35 ug/L (MW-3)'i6 700 ug/L (MW-1) Hd was not detected in any of the wells sampled' Chemical I �t concentrations in groundwater are depicted on Figure 2 Imo^ TPHg, BTEX and MTBE were not detected in trip blank sample TB-1 and equipment blank i-�- sample EB-1 DISCUSSION JAI& R The concentrations of TPHg and benzene have decreased significantly in each well since December 1995 Concentrations of MTBE increased in three of the five wells sampled' The distribution of benzene and MTBE in groundwater beneath and upgradient (north) of I' the site continues to strongly suggest an upgradient offsite source for the groundwater ' impacts beneath the Togo's site � , I IiE;� i1 I I I , a I i 1 I V II 11 i Illi' h I I I' 1