ARCHIVED REPORTS XR0012676 - Laserfiche WebLink

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- -- "mss. _'= �.` MW ._. Grantline and East Roads Page 7 of 8 and hold for possible future analysis, if the first 3 water samples prove to be contaminated, 6. Measure the water level in 8 selected borings and survey the elevations of the borings to a common datum in order to make a groundwater gradient map. This groundwater gradient map will allow a more cost-effective and reasonable selection of future groundwater monitoring or product recovery wells, if they are needed. 7. Provide a report of findings and outline the zones of soil and groundwater contamination. The attached table of sampling parameters has been provided to make the sampling plan easier to follow. RECOMMENDATIONS PHASE II 1. Remove and dispose of one 8000-gallon diesel, two 10000-gallon gasoline and 550-gallon waste oil tanks and associated lines. 2. Remove and dispose of any azt,ionable soils generated from the - tank and line removals. 3. Drain the excavation pit of groundwater and sample the water for TPH (as gasoline)%BTEX and TPH (as diesel) . 4. Backfill the excavation pit with clean imported soil; compact and resurface the former tank pit area. S. If groundwater .contamination is observed to be above the Regional Water Quality Control Boards, CAL, a product recovery, water treatment system and monitoring wells will be required. This recommendation is contingent on the findings of the Phase II assessment described in the Phase I recommendations of this report. 6. Treat in-place soils with a soil vapor recovery system. This recommendation is also contingent on the findings of the Phase 11 assessment described in the Phase I recommendations of this report. LIMITATIONS The conclusions and _professional-guidelines-presented-herein-were -T _ _:—"developed in accordance withenerall accepted for addressing UST investigations as outlined in the guidelines from the California Water,-Quality Control Board. Because the analytical