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Remedial Action Plan Addendum January 14, 1993 <br /> Southland Store No. 20304, 455 Grant Une Rd., Tracy, CA <br /> Y 9 <br />{ *. <br /> 3.5 Operation and Maintenance <br /> 4 <br /> The RWQCB—CV General Orders for discharge of groundwater from cleanup projects require <br /> monthly sampling of the treatment system influent, effluent, and receiving waters. Samples will be <br /> analyzed for TPH-as-gasoline, benzene, toluene, ethylbenzene, and xylenes (BTEX), and toxicity by <br /> bioassay. Therefore, the number of site visits will be determined by permits rather than by system <br /> maintenance requirements. The monthly site visits will also consist of maintaining pumps and filters, <br /> recording flow rates and volume totals, and field measuring pH and specific conductance in samples <br /> collected from the treatment system influent and effluent and the receiving waters. <br /> 3.6 Reports <br /> f <br /> i <br /> A report will be prepared quarterly for Southland's review and forwarding to the RWQCB—CV, the k <br /> Ik SJCEHD, and the DTSC. An annual report will be prepared in place of every fourth quarterly report <br /> for review and submittal as described above. If necessary, additional reports will be prepared <br /> documenting significant changes to the operating system or variances in the discharge <br /> t <br /> concentrations. A closure report will be prepared after completing the closure activities outlined in <br /> Section 3.8. <br /> h <br /> 3.7 Phase 1 Schedule <br /> Plan approvals, permitting, and construction-of aboveground and belowground systems are <br /> expected to require approximately 9 to 12 weeks. Figure 7 illustrates the proposed schedule. r <br /> 3.8 Site Closure <br /> I• <br /> After groundwater cleanup activities reduce hydrocarbons in the groundwater influent and monitoring <br /> wells to negotiated concentrations, a verification drilling and sampling protocol will be submitted to <br /> the RWQCB for approval. The verification drilling will include drilling three borings into and beneath <br /> the former tank pit area and other degraded areas. The sampling protocol will include collecting soil <br /> samples from each boring at 5-foot intervals down to the groundwater table. Each sample will be <br /> analyzed to verify that hydrocarbons in the soils are below action concentrations. Groundwater ! <br /> Technology will request closure of the site when hydrocarbons in the recovery well, downgradient <br /> R3263Al.SLL <br /> GROUNDWATER <br />` TECHNOLOGY,INC. <br /> I � <br /> r <br />