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1� Consolidated Forward andfill Page l conduct The appropriate responsible agenciee forCthe vertical RWQCB,n ovlr the existing el di ll(s) the liner and leachate collection system proposed in the JTD. 49 (F.6) Proposed as Part of the Project: Because of the potential for contamination from«`1L B and or A of the shallow groundwater table downgradient and adjacent to h 1ill bejsarnpledting at the sametfrequen='as'the within 300 feet of the eastern property boundary` monitoring wells onsite and for the same constituents(see CCR,Title 27)_ Final determination of the sampling program and the evaluation of the test results,along _ ility of the R%t QCB and must be carried ou:-Cer appropriate mitigation,is the responsib their permit authorization. Identified in This EIR: %ve!ls along Austin s the two on Water quality at the offsite wells, sac biannuall. (t«'�e a y ear)to determine the x-zn: : -at CyA wells. shall be in at leas the plume impacts them. Continued operation of the groundwater extraction systern =: ent site %will help limit the contaminant plume from ex ent far beyond the boundary of Austin Road i La�.d -b-,. will not address the offsite component unless the contamination is attenuated and diluted o%-er t:: =e or more extraction�z e::= brought on line per the AEE(2001b) Alternative 3 proposal. However,in their reg: AEE only remedy (2002a)report the proposed alternative 11 isput a letteth as r o Forward dated March li 2002.is time. The RWQCB accepted alternative 11 in the If the groundwater VOC concentrations that Alternative 3o not te at or some a rate variant on Alternat_-eis acceptable to j3 -be RWQCB then the Board willrequire implemented. The recent(AEE,2002a) atrends and triggerddendum to the at which procedures to analyze the hydrochem additional extraction wells would be considered. (Adanson,2002). 50(F•7) Identified in This EIR: undwater currently Two infiltration methods are currently used at the landfill. Most of the groundwater pumped by the former agricultural well is used onsite;thus,some q it er fr infiltrate it�O�� the unlined parts of the site and migrate back to the groundwater aqui extracted. Secondly,the treated groundwater from the groundwater extraction low and moves discharged into Littlejohn Creek currently,which both recharges aqui offsite. Treated groundwater from the groundwater extraction system is proposed It be infiwelled back to the aquifer through an infiltration basin(AEE, 2001 B,0 Balocand isaL�1 MND'-11. The infiltration basin would improve recharge to theaquifer designed to create a hydraulic barrierto inhibit tter to Forward dated Maer rard ch l Igr 002 agreed t° '11o�ti' tion of the groundwater plume. The RWQCB le for their recharge remedy(Alternative 11heo o font/ ter ard w�Iehoutt Alternatlls occurs. if the (eaten a a r puat mping)while quarterly monitmonitoringong VOC concentrations do not attenuate at a rate that is acceptable to the RWQCB theme&e tive 3,be implemen Board %rill require that Alternative 3, or some variant or,Alterna `�d•the the corrective edures to recent(AEE,2002a) addendum °concentrations at tto .p,additional extract on rani'_= z mould hydrochemical trends and triggerite- be considered. (Atkinson,2002).