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Flc No.2070-2 <br /> ~ 19 Dcccmbcr 1991 <br /> Page, 14 <br /> Land disposal of the treated groundwater is also an option. Land disposal includes disposal of the <br /> treated water to surface infiltration areas, disposal to surface evaporation areas, subsurface <br /> reinjection of the treated water as well as utilization of the treated water for landscape irrigation. <br /> The RWQCB has recently adopted a n ralrd r f Dic h r e f round Water from Cleanu <br /> f Pett roleum Fuel Pollution_ The general order will provide Waste Discharge Requirements for <br /> the land disposal of treated groundwater impacted by petroleum hydrocarUons. Sites which meet <br /> er the <br /> specific requirements will be allowed to discharge treated groundwater to plo<entialland pocostlsal ndrocess <br /> newly-adopted umbrella requirements", thereby foregoing the lengthy Y y p <br /> of site specific permit approval. <br /> 6.0 RECOMMENDED FURTHFR ACl'I_ONS <br /> 6.1 Soil Investigation <br /> _ Due to the removal of the majority of the contaminated soil following the 1987 tank removal <br /> operations, we feel that further effort concerning the limited amount of soil contamination which <br /> is present at the Rainbo Bakery site is neither warranted nor economically feasible. <br /> 6.2 Groundwater Investigation <br /> beneat <br /> the <br /> Remediation of the petroleum hydrocarbon <br /> of thepastleakage ofaunderground groundwater <br /> svfuel storage tanks needs lto be <br /> Rainbo Bakery site as p <br /> addressed. <br /> A well pumping test was performed for the Rainbo Bakery site utilizing the existing onsite <br /> as the pumping well and MW-2, MW-3, MW-4, MW-6 and <br /> monitoring wells. MW-1 was utilized <br /> W MW-8 were utilized as the observation wells.Measurements of the local groundwater table level <br /> indicated that all live observation wells (and consequently the full extent of the groundwater <br /> contaminant plume) was contained within the effective zone of influence of the pumped well after <br /> approximately 330 minutes of continuous pumping at a rate of 6.7 gpm. Further, after <br /> approximately 1200 minutes of continuous pumping, the rate of groundwater inflow to the pumped <br /> well approximately equaled the rate of discharge of groundwater from the pumping well. Based <br /> on our well pumping test results, it appears that MW-1 can be utilized as the extraction well for <br /> a groundwater extraction system. <br /> Treatment of the contaminated groundwater would be necessary prior to the discharge of the <br /> extracted groundwater. Discharge of the treated groundwater to the sanitary sewer system is not <br /> an option for the Rainbo Bakery site. Discharge of the treated groundwater to the storm drain <br /> system is an option. However, obtaining the required permits could be a Iengthy and costly <br /> process. Land disposal of the treated grounwater is a third option. The RWQCB has recently <br /> adopted a r�neral Drder for Discharge of Ground—W ter trem anu f PP'rte uel <br /> Polluting The general order will provide waste discharge requirements for the land disposal of { <br /> treated groundwater impacted by petroleum hydrocarbons. Sites which meet the specific <br /> requirements of the general order will be allowed to discharge treated groundwater to Iand disposal <br /> under these "umbrella requirements". <br /> � ANDERSON <br /> C CONSULTING <br /> „�, Noul <br />