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UARTERLY GROUND WATER MONITORING REPORT <br /> Second Quarter of 1992 <br /> 4491 West Durham Ferry Road <br /> Delta Project No 40-91-732 <br /> Page S <br /> ' TABLE 2 <br /> Chemical Analysts of Ground Water Samples <br /> ' Concentrations in Micrograms per Literµg11 (ppb) <br /> Sample Date Ethyl- <br /> ' Location Sampled Benzene Toluene benzene Xylenes EDCa EDBb TPHc TPHd <br /> MW-1 09/04/91 23 13 <05 35 <05 <05 140 NA <br /> 04/09/92 430 4,400 1,400 9,200 <2 <2 48,000 <200 <br />' 07/10/92 57 1,200 740 7,300 NA NA 45,000 NA <br /> MW-2 09/04/91 710 700 130 1,300 <0 5 <05 6,400 NA <br /> 04/09/92 1,400 720 59 250 <0 5 <05 2,400 <50 <br />' 07/10/92 3,300 1,400 86 980 NA NA 8,800 NA <br /> MW-3 09/04/91 <0 5 <05 <0 5 <05 <0 5 <05 <50 NA <br /> 04/09/92 10 <05 <05 <05 <05 <05 <50 <50 <br />' 07/10/92 <05 <1 0 <05 <05 NA NA <50 NA <br /> Domestic 09/04/91 <05 <0 5 <05 <05 <05 <0 5 <50 NA <br /> Well 04/09/92 NS <br /> 07/10/92 NS <br /> a 1,2-Dlchloroethane <br /> b Ethylene Dibromide <br /> c Total Petroleum Hydrocarbons as gasoline <br /> d Total Petroleum Hydrocarbons as diesel No 2 <br /> NA = Not analyzed <br /> NS = Not sampled <br />' 4.0 SUMMARY <br />' The water table was observed to be approximately 13 feet below the ground surface The direction of <br /> ground water flow was inferred to be toward the east-northeast at a hydraulic gradient of approximately <br />' 0002 <br />' The ground water samples collected from monitoring wells MW-1 and MW-2 had concentrations of <br /> petroleum hydrocarbons and a sheen of free-phase petroleum hydrocarbons was observed on the surface <br /> of the purge water from monitoring well MW-1 The ground water sample collected from monitoring <br /> well MW-3 revealed no detectible concentrations of BTEX or TPH as gasoline <br /> RPT029 TA <br /> 1 <br />