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d x Ri rL,-207012 191accember !991 - �-+: Page 13 1 Land disposal of the treated groundwater is Also an r-yrtion. Land disposal include; disposal of the treated water to surface infilt:atiun areas, disposal to sulfate evaporation areas, subsurface reinjection of the treated water as well as utilization of the ueatei water for landscape irrigation. The RNVQCB has recently adopted a QQ&_Rerai Order ''1r Di= h r f 1 1m_d Waler_fr�,leantln_ of Pekroieum Fu ]_ ' 11u'.. n Ths general order will provide Waste. Discharge Requirements for the land disposal os treated groundwater impacted by petroielirn hydrocarbons. Sites which 1r..et specific requirements will be allowed to discharge treated groundwater to Iand disposal under the newly-adopted "umbrella requireme:---!s% therzby foregoing the lengthy and poten0ally costly process of site specific 1,armit approval. 6AR- Mt-_DED FUR i-KER A 'l ONS 6.i Soi Investigation Due L:1 the renicval of the majority of the contaminated soil following the 1987 tank removal operations, we feel that Farther effort cot-cerning the limited amount of soil contamination which is present at the Rainbo Bakery site is neither warranted nor economically feasible. 6.2 Groundwater 'fT.vestigatior, Remediation of the petroleum hydrocarbon contaminated groundwater which occurs beneath the Rainbo Bakery site as a result of the pa.-Ni leakage of underground fuel storage tanks needs to be addressed. A well pumping test was performed for the Rainbo Bakery site utilizing the existing onsite monitoring wells..MI.V-1 was utilized as the pumping well and MW,2, MW-3, r1W 4, MW-6 and MW-8 were utilized 'as the obsmatio:i wells. Measurements of the local grcr;ndwater table level indicated that all five obsern°aticn wells (and consequently the full extent of the groundwater cciraminant plume) was contained within the effective zone of influence of the pumped well after approximately 330 minutes of continuous pumping at a rate of 6.1 gpm. Further, after apprrximately 1200 minutes of continuous pumping, the rate of groundwater inflow to the pumped well approximately equaled the rate of discharge of groundwater from the pumping well, Based W on our well pumping test results, it appears that MW-1 can be utilized ac the extraction well for Pt graundwsi;:r extraction system. w� Treatment of the contaminated groundwater would be necessary prior to the discharge of the extracted groundwater. Discharge of the treated groundwater to the sanitary sewer system is not an option for the Rainbo Bakery site. Discharge of the treated groundwater to the storm drain r. system is an option. However, obtaining the required permits could be a lengthy and costly process. Land disposal of the treated grounwater is a third option. The RIVQCB has recently adopted a Ceneral Order fr Discharge of Ground Water•from Cleanup of Petroleum Fuel. 1111 ion The general order will provide waste discharge requirements for the land disposal of treated groundwater impacted by petroleum hydrocarbons. Sites which meet the specific requirements of the general order will be allowed to discharge treated groundwater to land disposal under these "umbrella requirements". ANDERSON, CONSULTING ✓. GROUP