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Groundwater Contamination Source Area Remediation BTEX Remediation at a REDUCTION OF BM IN MW-5 Service Station in California ni ce Station in California A service station in California was contaminated with \ , high levels of BTEX due to leaking underground storage tanks.The aquifer material consists of sandy silt with inter- mittent day silt and silty sand. The depth of the ground- water is 7 feet below ground surface. A total of 2,530 pounds of ORC were injected az a slurry with push point technology along the northern and cast- em sides well MW-5 at the outered underground of thestorage Existing injection zone was used to monitor the reduction of BTEX and results are shown in Figure 1. The reduction in BTEX by 99%. This ` ` �•{ �s`y site was then dosed. " " " TPH Remediation at a Car Rental Facility in Oregon Figure Z RMUCTIONOF-TPHINMW-4 . Car Rental Facility in Oregon Leaks from underground storage tanks and associated 'amMs� infrastructure at a car rental facility in Oregon resulted in , gasoline contaminated groundwater. The major objective was to accelerate the natural attenuation of the TPH con- tamination as well as the lesser concentrations of benzene 'Ws .mac and naphthalene components at the site. An interim pro- ti as , e ° ` gram of pump and treat combined with SVE was imple- mented, mple mented,and was carried forward to a practical limit,when "06 car x a 4 wee. ORC was then employed to polish the site to closure. The aquifer material consists of a silty sand interbed- ded with clay.Groundwater is 5 feet below ground surface. 3a A total of 1900 pounds of ORC was injected as a slurry into the site in a rectangular array involving 32 push point applications.Two injections were made a year apart. The At this point the residual levels of benzene were reduced impact of the ORC on TPH in sentinel well MW4 is illus- from 500 ppb (parts per billion, equivalent toµg/1) to 75 trated in Figure 2,where after a slight rebound event and the ppb and naphthalene was reduced from 220 ppb to non- re-application,a final TPH reduction of 97%was achieved. detect The site was then closed.