Laserfiche WebLink
Ms Mary Meays <br /> San Joaquin County <br /> December 6, 1994 <br /> Page 4 <br /> the tank removal and later remedial activities are presented in Table 3 The analytical <br /> results for sampling conducted during the well construction and earlier hydropunch <br /> sampling are tabulated on Table 1 of the well installation report presented in Attachment <br /> D <br /> 5. "Vertical and lateral concentration contours of contaminants found initially, <br /> and those remaining in soil and groundwater, both on and off site" <br /> As indicated by the analytical results presented in Tables 1 and 3, subsequent to the <br /> remedial activities conducted immediately after the tank removal (see item 7), no <br /> contaminants were detected in the soil nor in the groundwater monitoring conducted in <br /> the last three quarters Therefore, this information is not applicable to this site <br /> 6. "Mass balance calculation of the substance treated versus that remaining" <br /> As indicated by the analytical results presented in Tables 1 and 3, no contaminants were <br /> detected in soil samples collected subsequent to overexcavating the tank pit nor in <br />. groundwater monitoring conducted in the last three quarters Therefore, this requirement <br /> is not applicable to this site since the data indicates that there are no contaminants <br /> remaining <br /> 7. "Technology used to clean the site" <br /> During the initial tank removal activities conducted in June 1992, a total of approximately <br /> 160 tons of hydrocarbon-affected soil was excavated, removed from the site, and disposed <br /> of Approximately 1,500 gallons of groundwater were also evacuated and removed from <br /> the site Within the next nearly two years, as indicated by the groundwater monitoring <br /> data collected over the last three quarters, any remaining trace levels of petroleum <br /> hydrocarbons in the groundwater were degraded by naturally occurring biological <br /> activities <br /> 8. "Zone of influence calculated for the subsurface remediation system and the <br /> zone of capture attained for the soil and groundwater remediation system" <br /> No groundwater remediation system was constructed at this site <br /> 9. "Reasons why "background" was/is unattainable" <br /> No contaminants of concern were detected during monitoring conducted over the last <br /> three quarters "Background" was attained <br />