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I Site Closure Summary Fuller Mobile Home Park August 8, 1997 I 365 E. Louise Avenue, Lathrop, California Page. 6 domestic well is identified within the 2,000 ft radius to the northwest of the site which is also up gradient (Appendix C) The conclusion of that report indicates there are no.receptors identified within a 2,000 foot radii, that would be adversely impacted or cause risk to human health 1 i8.0 Petroleum Hydrocarbon Contaminates ' The petroleum hydrocarbon contaminates found in both soil and groundwater at this site are Gasoline, Diesel, Benzene, Ethyl Benzene, Toluene and Xylenes The only analyte of concern appears to be the elevated levels of Benzene in the first groundwater aquifer The ' other analytes are below the levels of concern as identified in the "Technical Memorandum to Staff," dated May 5, 1995 by Jon B Marshall entitled, 'Beneficial Use - Protective Water Quality Limited for Components of Petroleum -Based Fuels" (Appendix E) Soil and groundwater contamination has been limited primarily to the areas of bonngs B 1 through B4 and Monitoring Wells MW-1, 2 and 3 (Figure 2), respectively, since late 1993 Since January 1995, the period of the highest concentrations of petroleum, there has been a decline or regression of the Benzene analyte as well as the other analytes as identified by the Groundwater Tabular Data presented in the tables of this report Further, the Benzene Regression Chart incorporates the stability and regression of Benzene over time in Monitoring Wells MW-1, 2 and 3 (Appendix F) ' The regression is an occurrence of natural attenuation over time No Best Available Technology (BAT) has been employed as of this date 1 ' 9.0 Best Available Technologies With regards to BAT applications at this site, much discussion has been had about various technologies such as Groundwater Pump and Treat Systems, Air Sparging and Soil Gas Vapor Extraction Systems and of course, re-excavation of the secondary source ' Re-excavation or over excavation may have been appropriate at the time of tank removal However, now subsurface construction such as storm drains, sewer line and construction of a storm drain reservoir have occurred making re-excavation far to costly Further, this activity would require excavation on another individuals property, (Estimated Cost $51,00000)