ARCHIVED REPORTS XR0009904 - Laserfiche WebLink

Home Browse Search

Corrective Action Plan Page 9 0 On August 14th 1992, the CRWQCB found, inter alfa, that pumping and treatment of groundwater contaminated by hydrocarbon fuels by air stripping and/or carbon adsorption can dependably remove constituents of concern so that the pumped groundwater can be safely discharged to surface waters (Ref 1 ) To facilitate remediation programs, the CRWQCB issued Order No 92-150 - "General Order for Discharge of Ground Water from Cleanup of Petroleum Fuel Pollution to Surface Waters" The effect of the order was to issue NPDES Permit No CA0082929 under the United States Environmental Protection Agency's (EPA) Consolidated Permits Program The permit controls discharges of pumped groundwater affected by hydrocarbon fuels that has been treated by air stripping and/or carbon adsorption ❑ Discharges permitted under CRWQCB Order No 92-150 are restricted to those that comply with the provisions of the order, including its specific limitations on the concentrations of components of hydrocarbon fuels in the released water and maximum discharge flow rates (Discharge rates are generally limited to 50 gpm and discharges in excess of 100,000 gallons per day are prohibited ) ❑ City of Tracy Ordinance No 898 C S , adopted on March 15th 1994, prohibits any operation that generates noise in excess of 65 decibels (dB) at, or beyond, the property boundary in a commercial district and restricts the operation of a broad class of noise-generating, construction equipment to the hours between 7 00 AM and 10 00 PM (Ref 2) ❑ The San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) Rule 2020, as amended on October 21 st 1993, limits uncontrolled emissions of volatile organic compounds (VOCs)to the air from groundwater treatment systems to 2 pounds in any 24 hour period (Ref 6) Consideration of Alternate Remedial Technologies tThe applicability of a variety of site management and remediation technologies to the site- specific conditions was considered when the original corrective action plan for the subject property was prepared (Ref 14) These included no active remedial action (monitoring only), excavation and treatment of contaminated soil, groundwater recovery and treatment, various technologies based on vacuum extraction and bio-venting and several combinations of technologies that were possible candidates for application at this site Although the concentration of components of gasoline in groundwater recovered from the wells on the subject property have markedly decreased since contamination of the subsurface was discovered (see Table 3), management of the site by regular groundwater monitoring without any active remedial action was judged to be unacceptable in the context of regulatory concern