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411 BEST AVAILABLE TECHNOLOGY <br /> As described in Sections 2 and 3, soil and limited ground water <br /> remediation was completed at Sites #1 and #2 These remediation <br /> ' activities were identified following a remedial technology screening and <br /> alternative development and evaluation process, as detailed in the Final <br /> Remediation Plan for Former Storage Tanks Located at .1325 and 1515 West <br /> ' Weber Avenue - Stockton, California (ERM, September 1993) This <br /> remediation plan was approved by PHS/EHD, and the implementation <br /> activities were overseen by PHS/EHD representatives This section <br /> discusses the use of the best available technology (BAT) in those <br /> remediation activities <br /> 4.1 SOIL REMEDIATION <br />' Soil excavation and on-site aeration were selected as the BAT for <br />' remediation at the West Weber Avenue sites The soils at the sites have <br /> low permeabilities and high moisture contents This combination <br /> prevents the effective use of other conventional technologies, such as in- <br /> situ soil vapor extraction Therefore,soil excavation was the BAT for the <br /> sites <br /> ERM was unable to attain "background" soil concentrations in portions of <br /> both Site #1 and #2 using soil excavation At the time of soil excavation <br /> activities, warehouses were present on the areas of suspected TPH impact, <br />' and the soil could not be removed directly beneath and adjacent to the <br /> buildings <br /> 4.2 GROUND WATER REMEDIATION <br />' Two technologies were used in remediation activities at the sites As <br /> discussed in Sections 2 7 and 3 7, ground water extraction was evaluated <br />' at the sites and found to be an ineffective technology for remediating site <br /> ground water Subsequently, ORC socks were used as an in situ <br />' technology for ground water remediation ORC has shown to be effective <br /> at increasing chemical degradation in site ground water However, as <br /> noted above, the biodegradation capacity of site conditions is more than <br />' adequate to address the low levels of TPH and BTEX constituents <br /> currently present in ground water, with or without the continued addition <br /> of ORC Therefore, although background conditions have not been <br /> achieved at this time, naturaIIy occurring biodegradation activities will <br /> ERM 19 CAL LLLUS/2996 10-10/13/99 <br />