ARCHIVED REPORTS XR0009921 - Laserfiche WebLink

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Corrective Action Plan Page 36 Gasoline vapors are not expected to accumulate in any area within the groundwater treatment enclosure and the applicable regulations do not require the electrical and electronic equipment located there to be certified for use in "hazardous locations" as such locations are defined in the National Electrical Code and the Uniform Fire Code In context, hazardous locations are defined as areas around outdoor equipment where flammable vapor-air mixtures may exist under normal operation " However, as previously described, as a safeguard against any unexpected fumes being present there, the noise- control enclosure that houses the air stripper is equipped with a forced-air ventilation system and all electrical equipment located in that enclosure is of explosion proof construction Similar conservatism is exercised with electronic equipment located in the well-head boxes and on the surge tank All electrical devices in those areas meet the requirements for Class I, Division 2 locations The conduits that carry power and signal lines from the control and distribution panels to the groundwater recovery wells are sealed to prevent any air that aught be affected by volatile compounds migrating through them All electrical panels and switch boxes comply with NEMA Class 3 specifications DISCHARGE OF TREATED GROUNDWATER The treated groundwater will be discharged via a 3 in diameter, ductile-iron pipeline running underground from the treatment system enclosure to the existing storm-water sewer on the adjacent property at 124 East 11th Street (See Figure 6 for locations of discharge line and storm sewer ) The discharge to the municipal storm water sewer will be subject to authorization by the City of Tracy Utilities Department and a Permit to Discharge issued by the CRWQCB under the provisions of NPDES Permit No CA0082929 Effluent Limitations The requirements of NPDES Permit No CA0082929 limit the concentrations of components of hydrocarbon fuels to the discharge from the groundwater treatment system to the following Constituent Concentration Limit 30-day Mean Daily Maximum Total Petroleum Hydrocarbons < 50 µg/Liter 100 jig/Liter Benzene < 0 5 µSQ- 5 µg�- iter iters Toluene < 0 5 µg/Liter 5 µg/Literl