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James L. Tjosvold <br /> April 28, 1994 <br /> Page 2 <br /> 5. Collect Zone A and Zone B HydropunchTM samples from a borehole at the <br /> original proposed location for(MW-17) (northwest edge of the PG&E <br /> property). Choose one of the following alternatives based on sample results: <br /> 5a. Alternative 1: <br /> If gas plant residue constituents are not detected in Zone A and Zone B <br /> HydropunchTM samples at this location, then install a Zone B well (MW-17) at <br /> this location and a Zone C well (MW-15) approximately 20 feet to the east. <br /> Both wells will be on PG&E property. <br /> Justification: Samples from these wells will be used to evaluate downgradient <br /> water quality in both Zone B and Zone C; site access will be safer and more <br /> convenient; and these wells can act as points of compliance for a groundwater <br /> monitoring program. <br /> 5b. Alternative 2: <br /> If gas plant residue constituents are detected in Zone A but not Zone B <br /> HydropunchTM samples, install Zone B well (MW-17) at this location and <br /> install Zone C well (MW-15) in the Church St. right-of-way adjacent to the <br /> Mia Ranchera Restaurant parking lot. <br /> Justification: These well locations will allow for evaluation of downgradient <br /> water quality in both Zone B and Zone C, and these wells can act as points of <br /> compliance for a groundwater monitoring program. <br /> 5c. Alternative 3: <br /> If gas plant residue constituents are detected in both Zone A and Zone B <br /> HydropunchTM samples, then install a Zone B well (MW-17) in the Church St. <br /> right-of-way adjacent to the Housing Authority parking lot, near the proposed <br /> location for Zone C well (MW-16) and install Zone C well (MW-15) in the <br /> Church St. right-of-way adjacent to the Mia Ranchera Restaurant parking lot. <br /> Justification: These well locations will allow for evaluation of downgradient <br /> water quality in both Zone B and Zone C, and these wells can act as points of <br /> compliance for a groundwater monitoring program. <br /> 6. Conduct a pumping test in Zone B. <br /> Justification: During Phase IIIc field work, it was determined that Zone A <br /> could not maintain a pumping rate higher than 0.5 gpm. Therefore, if <br /> groundwater remediation is required, some pumping in Zone B may be <br /> necessary. Data from an aquifer pumping test using Zone B wells (MW-20) <br /> and (MW-5) will be used to evaluate remedial alternatives. Well (MW-20) <br /> may also act as a remediation well. <br />