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URS N N Mr. Robert McClellon January 4, 2005 Page 2 will obtain your approval of the proposed pilot test activities, including the soil vapor treatment method, before starting the pilot test. However, if the information collected during the geophysical survey indicates that a longer pilot test is needed, we will request approval from you before starting the pilot test activities. If the pilot test is planned for more than five days, we will transmit a completed permit application for ATC to the SJVAPCD for approval. It is our understanding that, given the current SJVAPCD workload, the ATC probably would be processed in approximately three months. The results of the vapor extraction pilot test will be used to select and size an appropriate remediation and treatment system. The details of the proposed remediation and treatment system will be transmitted to the SJVAPCD for approval prior to construction and startup. Comment 2.The remediation plan does not define what the"short-term vapor extraction pilot test"is, and how it will be conducted and evaluated for remediation for the site. Response to Comment 2.At this time, we plan to conduct the short-term vapor extraction pilot test for less than five days. However, if the information collected during the geophysical survey indicates that a longer pilot test is needed, we will request your approval prior to startup and obtain an ATC from the SJVA PCD. The details of how the pilot test will be conducted are provided in the following section. Comment 3.The remediation plan lacks precise locations and description of the two ventilation wells. Response to Comment 3. The locations of the extraction wells were described in the remediation plan as being halfway between VW-4 and VW-5 and halfway between VW-5 and VW-6. These extraction wells may be relocated based on the information collected during the geophysical survey. In either case, we will obtain your approval of the extraction well locations prior to their installation. We anticipate that the wells will be constructed with 2-inch polyvinyl chloride (PVC)piping screened from the bottom of the landfill(the bottom of the debris is expected to be within 20 feet below the ground surface[bgs])to 6 feet bgs. Comment 4.The remediation plan does not address what corrective actions need to be taken to protect the public health, safety,and the environment in accordance to Title 27 California Code of Regulations (27 CCR) Section 20937(a)(4). Response to Comment 4. At this time, current data are insufficient for the selection and sizing of a proper remediation and treatment system. This remediation plan addendum provides our approach to implement corrective actions to protect public health, safety, and the environment. Comment 5.The gas control system described in the remediation plan has not been designed by a registered civil or mechanical engineer in accordance to 27 CCR 20937 (a)(5). Response to Comment 5. See response to Comment 4. K:\Wprocess\25532\WorldEnterprise\Remediation Plan\010405-Undoc