ARCHIVED REPORTS_XR0012190 - Laserfiche WebLink

Home Browse Search

i 1 I 16 maintenance of the VES typically includes daily site inspections the first five days of operation and weekly site visits the first month of operation ' Typical APCD guidelines during the startup phase require the collection of influent and effluent air samples from the VES on a daily basis for the first three days of operation to demonstrate system efficiency, and every two weeks thereafter for the next month After the initial startup phase, sample collection may be reduced to once every month for the life of the remediation project, at the discretion of the APCD 5.5 System Operations, Maintenance and Compliance Monitoring and Reporting I After startup and source testing, the APCD will likely require site visits a minimum of once per month for the life of the project Modifications to this schedule would be made if additional requirements are specified by the guidelines set forth by the APCD in the ATC/PTO Remediation status reports should be prepared for submittal to the County and the APCD on a quarterly basis or the frequency specified in the PTO ' Site operations and monitoring should include adjustment of system parameters to optimize VES extraction and treatment, and thus site cleanup efficiency, periodic sampling and field monitoring of influent and effluent as required by the APCD, and other periodic maintenance procedures including inspection and cleaning of all lines, process equipment, and instrumentation Parameters to be monitored and adjusted in the field should include vapor extraction flow rates, induced vacuum responses at on site wells, and hydrocarbon vapor concentrations i If at any time laboratory analytical results or field monitoring readings show air emission limits to be exceeded, a confirmation air sample should be collected in accordance with APCD permit guidelines 5.6 Confirmation Soil Borings Following the indicated completion of vapor extraction, Ground Zero proposes to drill confirmation borings adjacent to soil borings SB-24 SB-25 J , SB-26, SB-29, and into the former tank cavity to collect confirmation samples from depths summarized on Table 5 Soil samples will be collected from the confirmation borings within the depth intervals specified in Table 5 at 5 foot intervals and analyzed for TPHg and BTEX using EPA Methods 8015/8020 5.7 Fate and Transport Model � if a significant volume of gasoline hydrocarbons remains in the soil after best available technology has been demonstrated to provide no additional benefit then fate and transport model will be prepared to provide an indication of future impact ' zroundwltmk\cap 22