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1 <br /> QUARTERLY GROUND WATER MONITORING REPORT <br /> First Quarter of 1992 <br /> 4491 West Durham Ferry Road <br /> Delta Project No 40-91-732 <br /> Page 5 <br /> TABLE 2 <br /> Chemical Analysis of Ground Water Samples <br /> Concentrations in Micrograms per Liter µg/I (ppb) <br /> Sample Date Ethyl-Location Sampled Benzene Toluene benzene Xylenes EDCa EDB b TP1V TPHd <br /> ' MW-1 09/04/91 23 1 3 <05 3 5 <0 5 <05 140 NA <br /> 04/09/92 430 4,400 1,400 9,200 <2 <2 48,000 <200 <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 /> MW-3 09/04/91 <05 <05 <0 5 <05 <0 5 <01 <50 NA <br /> ' 04/09/92 10 <0 5 <0 5 <05 <05 <05 <50 <50 <br /> Domestic 09/04/91 <05 <0 5 <05 <05 <0 5 <05 <50 NA <br /> la <br /> Well 04/09/92 NS <br /> 1,2-Dlchloroethane <br /> b Ethylene Dlbromlde <br /> 'Dotal Petroleum Hydrocarbons as gasoline <br /> '?dotal 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 15 feet below the ground surface The direction of <br /> ground water flow was inferred to be toward the northeast at a hydraulic gradient of approximately 0 006 <br /> The ground water samples collected from monitoring wells MW-1 and MW-2 had elevated concentrations <br /> ' of petroleum hydrocarbons and 0 03 foot of free-phase petroleum hydrocarbons was observed In <br /> monitoring well MW-1 The ground water sample collected from downgradlent monitoring well MW-3 <br /> ' revealed 1 0 ppb benzene <br /> RPT 116 H 4B <br />