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Fig. 7. Bromide, MS-2, and PRD-1 levels in soil core extracts collected at Field Sites 2 (sampled 21 d following tracer addition), 10, 12, 14, and 16 (sampled 7 to 9 d following addition of surrogates and tracer to the septic tank effluent [STE] being applied). Detection limits are: bromide at 0.1 mg/L (ponding) or mg/kg dry soil and MS-2 and PRD-1 at 1 plaque forming unit (pfu)/mL (ponding) or g of dry soil. Zero values (blank bars) represent nondetects. Site 2 was wet with no ponding; bromide was not detected in soil cores. IS, infiltrative surface.
