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Fuller Mobile Home Park <br />' 36S E. Louise Ave:, Lathrop, California May 28, 1998 <br /> Phase HSite Characterization- Continued Page: 7 <br /> The initial mass balance calculation from data collected in 1992, '93 and '94 indicated <br />' approximately 1,308 cubic yards of underlying soils impacted with approximately 1,178 <br /> gallons of petroleum hydrocarbon contamination within that mass <br />' The differential between the earlier samples taken in 1992, '93 and the samples taken in '98 <br /> is approximately 158 cubic yards and 1,140 gallons of petroleum hydrocarbons This <br /> decline in mass and content is due to the natural 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 dechrung Ievels of all analytes over the past 5 <br /> fyears of study, as supported by the enclosed data <br /> The economic impact to the client/owner has created a financial hardship costing <br /> r $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 /> I Therefore, given the aforementioned conclusions, WI-IF 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 /> Iclosure <br /> • <br />