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TPHg - Total petroleum hydCpn7rts <br /> ons by EPA 8015. <br /> ug/L - micrograms per titer per billion. <br /> ND - Not detected, PHg (& 2 mg/L, BTEX Q 0.5 ug/L <br /> NA - Data not availab <br /> DTW - Depth to water 4iow gra e <br /> 40 <br /> i <br />