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II Fuller Mobile Home Park 365 E. Louise Ave., Lathrop, California July 28, 1998 Phase II Site Characterization- Continued(Addendum) Page: 7 � i calculated volume in gallons of petroleum hydrocarbon contamination remaining is approximately 110.95 gallons. The initial mass balance calculation from data collected in 1992, '93 and '94 indicated approximately 1,550 cubic yards of underlying soils impacted with approximately 351 gallons of petroleum hydrocarbon contamination within that mass. The differential between the earlier samples taken in 1992, '93 and the samples taken in"98 is approximately 240.05 gallons of petroleum hydrocarbons. This decline in content is clue to the natural biological attenuation process underlying this site. !I The Hydrocarbon Degrading Enumeration Assays indicates that the hydrocarbon degrading bacteria present in the soil have colonized in sufficient levels to achieve remedial capabilities and further that intrinsic remediation is occurring as a result of the 2.4 x 102 CFU's and greater, as identified in samples B-7, B-9 and B-11 assayed• ii ii The Receptor Survey conducted in February 1997 concludes that none of the four l�(4) private wells identified within the survey boundaries will be adversely impacted. The three (3) private wells to the west are to be destroyed in compliance with the City of Lathrops development and the fourth well located at the mobile home park which is utilized 111for irrigation is up gradient and tested non-detected for all petroleum hydrocarbon analytes; Soil Gas Vapor Emission from the effected area is non-detectable at grade level whedthe property was surveyed by PID on August 9, 1997. 1 The historical groundwater data has shown declining levels of all analytes over the past 5 years of study, as supported by the enclosed data. I� it The economic impact to the client/owner has created a financial hardship costing $60,000.00 +, due to the inability to refinance his construction loans into a fully amortized loan. To date $100,000.00 has been expended on this site to evaluate and study the site conditions. Had the problem been addressed at the time of tank removal, only a small portion of these funds would have been expended and the additional financial hardship would not have been experienced. u Therefore, given the aforementioned conclusions, WET believes that this site presents no risk to human health or to the environment, and that natural attenuation of the remaining contamination will mitigate the site with no significant health risk. We recommend site closure. E .i ii u 11.