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Fuller Mobile Home Park <br />' 365 E. Louise Ave., Lathrop, California May 28, 1998 <br /> • Phase II Site Characterization - Continued Page: 7 <br />' calculated volume in all ons of petroleum hydrocarbon contamination remaining is <br /> approximate) 37 6 gallons <br />' The initial mass balance calculation from data collected in 1992 '93 and '94 mdic <br /> approxim y 1,30 cubic yards of underlying sods impacted with approximatel 1,178 <br />' gallons of hydrocarbon contamination within that mass <br />' The differential betwe a earlier sam les en in 1992, '93 and the samples taken in '98 <br /> is approximately 58 cu c yards , 40 Ions of petroleum hydrocarbons This <br /> decline in mass an content is due ral biological attenuation process underlying <br />' this site <br /> The Hydrocarbon Degrading Enumeration Assays indicates that the hydrocarbon <br />' degrading bacteria present in the soil have colonized in sufficient levels to achieve <br /> remedial capabilities and further that intrinsic remediation is occurring as a result of the <br /> 2 4 x 102 CFU's and greater, as identified in samples B-7, B-9 and B-11 assayed <br />' The Receptor Survey conducted in February 1997 concludes that none of the four (4) <br /> private wells identified within the survey boundaries will be adversely impacted The three <br /> (3) private wells to the west are to be destroyed in compliance with the City of Lathrops <br /> development and the fourth well located at the mobile home park which is utilized for <br /> irrigation is up gradient and tested non-detected for all petroleum hydrocarbon analytes <br /> Soil Gas Vapor Emission from the effected area is non-detectable at grade level when the <br /> property was surveyed by PID on August 9, 1997 <br />' The historical groundwater data has shown declining levels of all analytes over the past 5 <br /> � $ Yt <br />' years of study, as supported by the enclosed data <br /> The economic impact to the client/owner has created a financial hardship costing <br />' $60,000 00 +, due to the inability to refinance his construction loans into a fully <br /> amortized loan <br />' To date $100,000 00 has been expended on this site to evaluate and study the site <br /> conditions Had the problem been addressed at the time of tank removal, only a small <br /> portion of these funds would have been expended and the additional financial hardship <br />' would not have been experienced <br /> Therefore, given the aforementioned conclusions, WIT believes that this site presents no <br />' risk to human health or to the environment, and that natural attenuation of the remaining <br /> contamination will mitigate the site with no significant health risk We recommend site <br /> closure <br /> I <br />