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I <br />' w <br />' Groundwater Contamination Source Area Remediation <br />' BTEX Remediation ata -- <br /> Service Station in California <br />' A service station in California was contaminated with v„ry. , .nµY wk,•:,,,,} �}�„vzwk r� #w x,Y �� Vryti��., <br /> high levels of BTEX due to leaking underground storage <br /> .as~ ~,}`�.n:o ;<4� `,,.t• S4. ti 47 v „ nod:£`: i"�.:� <br /> tanks The aquifer material consists of sandy silt with inter- <br /> mittent clay silt and silty sand The depth of the ground- _ v <br /> water is 7 feet below ground surface <br /> A total of 2,550 pounds of ORC were injected as a slung <br /> with push point technology along the northern and east- <br /> Sr <br /> ~'t <br /> �64Q `ti.rK``.hkr`v ky ;bnri SS: ry <br /> :4 , rihv M1J$ ay.: : <br /> em sides of the existingunderground storage tank area ` : w t Aftn Y' `tiAk ctie `4: <br /> b' D V' N” <br /> '~``:i ;`;'`';, n„ -"h�Yv <br /> Existing well at the outer edge of the injection zone ` <br /> was used to monitor the reduction of BTEX and results are h " ##= <; "h€ ,{;«: "4 €r .•:� kV ; �,~ <br /> shown in Figure 1 The reduction in BTEX by 99% This <br /> °`vS' 4 4SJ ,iv <br /> site was then closed <br /> TPH Remediation at a - <br /> Car Rental Facility in Oregon <br /> Leaks from underground storage tanks and associated <br /> infrastructure at a car rental facility in Oregon resulted in <br /> gasoline contaminated groundwater The major objective at} •, ,h ` <br /> � a <br /> was to accelerate the natural Ittenuation of the TPH con- <br /> tamination as well as the lesser concentrations of benzene <br /> and naplithalene components at the site An interim pro- " <br /> grim of pump and treat combined Ns ith SVE was imple- <br /> mented,and was carried forward to a practical limit, when15 <br /> , <br /> ORC was then employed to polish the site to closure " n <br /> The aquifer material consists of a silty sand interbed- 0 "90 M 2" 9aa ::.``asp` -mss <br /> ded with clay Groundwater is 5 feet below ground surface Ilt`'s'y <br /> A total of 1900 pounds of ORC was injected as a slurry <br /> into the site in a rectangular array involving 32 pueh point <br /> applications Two injections were made a year apart The At this point the residual levels of benzene were reduced <br /> I impact of the ORC on TPH in sentinel well MWA is illus- from 500 ppb (parts per billion, equivalent to lig/1) to 75 <br /> traced in Figure 2,where after a slight rebound event and the ppb and naphthalene was reduced from 220 ppb to non- <br /> re-application,a final TPH reduction of 97%was achieved detect The site wis then closed <br /> I <br /> I <br />