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�.. .,oe <br /> Assessment of Contamination <br /> Addendum to Revised Work Plan <br /> 1. Introduction <br /> This addendum to the Revised Work Plan and Evaluation of Alternatives for Containment of The <br /> Chloroform Plume in Groundwater (Revised Work Plan) has been prepared by Condor Earth <br /> Technologies, Inc. (Condor) on behalf of Triple E Produce Corporation (Triple E). This <br /> addendum has been prepared to comply with the conditions of acceptance of the Revised Work <br /> Plan as stated by the California Regional Water Quality Control Board (Regional Board) in a <br /> letter to Triple E dated 31 July 1995. In the Revised Work Plan, Triple E indicated its intent <br /> not to perform any characterization work of the chloroform plume north (downgradient) of <br /> monitoring well MW-7, since chloroform concentrations detected in MW-7 are still within the <br /> range of chloroform from other potential sources in the area north of MW-7. In its letter, the <br /> _ Regional Board requested Triple E to provide additional information to support its position. This <br /> addendum addresses the Regional Board's requests and provides responses to each request. <br /> 2. Request 1 <br /> "The work plan states that no fewer than eight swimming pools were present within 2,000 feet <br /> of MW-7 as of 1987, but only one swimming pool is shown in the figure in Appendix E." <br /> 3. Response 1 <br /> Appendix E of the Revised Work Plan referred to the Final Report of the AB-1803 Follow-Up <br /> Program, San Joaquin Co. Small System Well, Maurland Manor. The report, dated December <br /> 1987, stated that "two swimming pools were sampled to determine the levels of chlorine they <br /> contained." The test data, however, reports trilialomethanes not chlorine. Page 18 of the <br /> report, which showed data for the second pool, was omitted from Appendix E because this pool <br /> was not near MW-7. A corrected Appendix E, which includes the second swimming pool <br /> sample, is herewith submitted. Data for the two swimming pools is shown in Table 1 below. <br /> Table 1 <br /> Sample ID Chemical and <br /> _ And Address Concentrations <br /> 611MM-5P Chloroform = 15.9 ppb <br /> 8875 W. Fairoaks Rd. Bromodichloromethane = 9.0 ppb <br /> Tracy, CA 95376 Dibromochloromethane = 7.2 ppb <br /> Bromoform = 1.3 ppb <br /> 611MM-7P Chloroform = 8.7 ppb <br /> �- 8027 W. Valpico Bromodichloromethane = 4.8 ppb <br /> Tracy, CA 95376 Dibromochloromethane = 3.9 ppb <br /> 1%1 <br /> n <br /> CONDOR <br />