California Site Closure with Petrox Bioremediation

Southern California Gasoline UST Release Site

After removal of USTs, piping and surrounding soils, ground water was treated with 110 gallons of Petrox® by direct injection in December 2009.  Post-treatment sampling shows that the bioaugmentation reduced the contaminant levels to below regulatory standards by the next semi-annual sampling round.

	Sampling Date	TPHg	Benzene	Toluene	Ethylbenzene	Total   Xylenes	MTBE
Pre-bioaugmentation	10/6/09	1,200	320	7.2	700	70	5
Post-bioaugmentation	4/26/10	<50	<0.5	<0.51	<1	<5	<0.5

All concentrations shown in µg/L.