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APR-21-97 MON 08:05 AM FHD/HMD FAX NO. 9163867011 P. 02 r� remediation alternative Therefore, several vapor wells should be installed to allow testing and remediation (if deemed necessary). Work plan Addendum This addendum provides the proposed locations and rationale for the welWbonngs recommended above Each of the welislborings will be installed in accordance with the 13 March 1994 work plan unless either otherwise stated herein or discussed with (and approved by) the lead regulatory agency (SJCPHDIEHD). Well Survey* A survey of supply wells will be performed. Based on current guidelines by the Central Valley Regional Water Quality Control Board (CVRWQCB),the surrey will be performed for wells within 2,000 feet of the site The survey will include reviewing the State of California, Department of Water Resources reoords and contacting the water purveyor(s) with the 2,000 foot survey area Air Sampling- Five air samples are proposed_ Each of the samples will be collected in a Summa canister held approximately 5-feet above ground surface (assumed breathing zone) Three of the samples will be collected outdoors while two will be collected from within the structure One outdoor sample will be collected off-site up-wind to assess 'background" . volatile concentrations A second outdoor sample will be collected in the dispenser area The third sample will be collected from above the previous location of the U STs One indoor sample will be collected from each of the two rooms (office and rest room) of the structure. Because the structure's main bay is used for automobile repair, sources of volatile organic emissions beyond the scope of this assessment will render any sampling meaningless Soil Barings: Two soil bonngs (8-4 and B-5) will be advanced in the pump island area (Plate 3 from the 1 August 1535 work plan has been attached for your convenience) Because of the limited access, the borings; will be slant dniled to allow the collection of a sail sample beneath each end of each pump island It is anticipated that the southem end samples can be collected at a depth of approximately 5 feet below ground surface (bgs) while the northern end samples may be as deep as _ 20' feet bgs Monitor Wells Two on-site and five off-site monitor wells are proposed to verify the contaminant limits established with the CPT survey and better define the groundwater plume in the southwest quadrant (Plate 3) Soil samples will be collected to confirm lithology at 10-foot Intervals A soil sample from within the capillary fringe of each