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7 <br /> 7-Eleven/Stockton 14 <br /> February 1989 <br /> hydrocarbons in all three sampling rounds. Based on review of <br /> chemical data collected over the last 6 months, the low <br /> concentrations of dissolved hydrocarbons detected in the outlying <br /> monitoring wells MW-14, MW-11, MW-10, and in PW-2 are probably <br /> the result of an external source introduced during the sampling <br /> or laboratory analyses procedures. In general, the dissolved- <br /> hydrocarbon plume beneath the site has not undergone significant <br /> migration during this reporting period. <br /> Results of laboratory analyses of groundwater samples <br /> collected from the surrounding domestic wells indicate sporadic <br /> results which were evident in past sampling rounds. Samples <br /> collected from domestic wells 9140, 9150, 9159, and the Ivy.Motel <br /> contained no detectable levels of dissolved hydrocarbons in all <br /> four sampling rounds conducted. Samples collected from domestic <br /> - wells 1912, 1927, 8968, 9160,9167, and TMG contained detectable <br /> levels of TPP-as--gasoline ranging from 1 to 48 parts per billion <br /> (ppb) for the first three sampling rounds only. Benzene was <br /> detected in only one sample collected from the TMG well on <br /> December 14, 1988, at a concentration of 1.0 ppb. No detectable <br /> {� levels of dissolved hydrocarbons were found in any of the <br /> domestic wells sampled on January 5, 1989 Laboratory analysis <br /> results are summarized in Table 2 (Appendix I) . <br /> REMEDIATION SYSTEMS <br /> i� <br /> The remediation systems currently operating at the site <br /> �y consist of groundwater-extraction and soil-vent systems. The <br /> , . groundwater-extraction system consists of pumping wells designed <br /> to remove free product and an air stripper designed to treat the <br /> dissolved constituents in the groundwater. The soil-vent system <br /> was installed to control hydrocarbon vapors and aid in reducing <br /> the adsorbed contamination in vadose-zone soils near the tank <br /> pit. <br /> GROUNDWATER <br /> [,b <br /> ! TFc11NO1AH 5:110. <br />