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TABLE 1 — CHECKLIST OF REQUIRED DATA <br /> FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES <br /> Site Name and Location: Former Reeves Exxon 2360 East Street TgLcy. California <br /> 11 Best available technology(BAT)used Not Apphcable <br /> 12 Reason why background was unattmnable using BAT Not cost effective The most recent levels of <br /> benzene nn groundwater is 10 ppb or less <br /> 13 Mass balance of treated versus remaarmng contaminants Not applicable However, the mass of <br /> contamunants remaining in the soil and groundwater have been calculated and are attached All samples <br /> within contaminated zones were honored and the average concentrations determined by zone in accordance <br /> with an accompanying figure Since all samples were honored in calculating the average, the estimate of <br /> mass remaining should be considered as `worst case" indication of residual contaminabon, since the <br /> earliest results do not account for natural attenuation over time <br /> 14 Assumptions,parameters,calculations,and model used in nsk assessment and fate and transport modeling <br /> See Ground Zero Analysis, Inc report Annual Groundwater and Sampling Report November 1, 1999 <br /> The tank removal and minor overexcavatnon have removed the source from the vadose zone Dissolved <br /> hydrocarbons in groundwater have declined well over 90% from hnstonc lughs and are currently only <br /> marginally above the MCL for benzene (7 2-10 ppb in Sept 1999, see tables and charts showing <br /> concentration vs time, attached) No MTBE is present in sod or groundwater Contamination of the soil <br /> and groundwater by long-chain hydrocarbons is present in soil and groundwater downgradient of the site <br /> due to a pnpehne leak below Grant Line Road <br /> 15 Rationale why conditions remaiing at site will not adversely impact water quality, health, or other <br /> beneficial uses See Ground Zero Analysis, Inc. report Annual Groundwater and Sampling Report <br /> November 1, 1999 Contaminant concentrations in groundwater and soil are expected to continue to <br /> decline through natural attenuation <br /> 16 WET or TCLP results See Waterwork Soil Sampling Report June 7, 1991 <br />