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i Mohr-Fry Ranches 950 Industrial Drive, Stockton, California May 31, 1995 Phase III Remedial Excavation Report Page: 6 1 This aquifer is considered to be of beneficial use and as a result, must be protected from contamination Those identified uses include agriculture and industrial, as well as potential use for animal or human consumption 8.0 Conclusions Excavation 1 had no detectable remaining contaminants Composite samples of the excavated soil detected motor oil (Figure 4 & Table 1) Excavation 2 has some Diesel and Motor Oil detected in five(5) of the 23 samples (Figure ' 5 & Table 2) Field screening with the PID did not detect contaminants Composite sampling of the excavated soils detected Toluene, E-Benzene, Xylenes, Diesel and Motor Oil contamination(Table 2) ' Excavation 3 has a trace of Diesel remaining in the floor of the outside excavation (F-3-1) Sample F-3-2 was taken in the area of the support pillar for the pier block, as was sample ' WSI-3-10 The latter two samples were taken for confirmation of contamination that could not be removed without compromising the structural integnty of the building Given the aforementioned data from the excavated areas, the minor amounts of residual contaminants at the 4,000 gallon tank location (Excavation 2) and the diesel tanks located adjacent to the main structure (Excavation 3) indicates that the effectiveness of the site mitigation activities accomplished a 98% cleanup level The residual contaminates that were left in place are minor in level and amount, and they do not pose any threat to human health or the environment The levels f Toluene e s o o uene and Xylenes found in MW-1, 2 & 3 and Boring B-2 soil samples (Appendix D) are of such low levels that if they entered the shallow groundwater underlying this site, the impact to groundwater would be minimal and certainly would not exceed the State of California's Recommended Action Level or MCL identified in the Valley Basin Plan developed to protect the waters of this State VJ 9.0 Recommendations After a complete review of all the data generated during the Investigative and Remedial ' activities associated with this site, it is the opinion of WBF that these locations have been successfully mitigated of the primary and secondary sources of contamination associated with the underground fuel tanks IIt is also recommended that Groundwater Quarterly monitoring continue until such tune as total discovery regarding the underground acetone tank location southeast of the building