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hydropunch sample taken from auger hole "B", directly beneath the removed waste oil tank TPH as gasoline was below detection limits in the water sample from auger hole "B" & also from MW -2 & MW -3, see PLATE XXII-E for details CONCLUSIONS Based upon the results of all of the data collected to date, the following conclusions appear to be valid 1 Except for the minor amounts of toluene, xylene, & TRPH encountered in Auger holes "A"" & "C" at 6161" (refer to TABLE IX,) soil contamination appears to be restricted to depths below 26" in the eight soil borings placed on the property Groundwater was encountered above 25" bgl during this work, which indicates the soil contamination may be due to changes in water levels, and not indigenous to the soils Some soil contamination remains in the area where the septic tank system was removed 2 Laboratory analyzes of water samples from the four monitoring wells, summarized on TABLE XI, revealed minor amounts of benzene in MW -3 & MW -4, varying amounts of touluene in MW -1, MW -2, & MW -4, and xylene in MW -1, MW -2, & MW -4 TPH as gasoline was only detected in MW -1, and TRPH as diesel was measured only in MW -4 These figures suggest that there are two sources of contamination on the property, one associated with the removed diesel tanks, and another in the area south or west of the shop building 3 Hydropunch water samples obtained from auger hole "A" revealed very high levels of BTEX and TPH as gasoline, TRPH was below detection limits Maps drawn of lines of equal concen- trations of BTEX & TPH-G (PLATES XXII-A thru XXIII-E,) show the anomalously high levels found in that water sample This data supports the conclusion in paragraph 2 above, (more than one source of contamination,) although without additional data, it is not possible to clarify the problem RECOMMENDATIONS. After reviewing of all of the data obtained to date, the following recommendations are made concerning this site 1 The four monitoring wells should be purged, sampled and tested on a quarterly basis until sufficient data is collected to determine what additional work is needed If possible, the monitoring well placed in the southeast corner of the property by Nomellini Construction Co should be included in this program This should allow better definition of the extent of groundwater 14