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TABLE 2 ANALYTICAL RESULTS OF WATER SAMPLES ' Ripon Farm Service 22871 South Highway 99, Ripon, California TPH as TPH as Ethyl- Sample ID Gasoline Diesel Benzene Toluene benzene Xylenes MW1/5-6-94 1,700 2,400 ND ND 35 36 MW-1/8-5-94 960 1,200 ND ND 4 2 54 iMW2/5-6-94 14,000 9,200 1,200 160 380 1,300 MW-2/8-5-94 9,400 12,000 880 90 330 450 ' MW3/5-6-94 2,600 6,900 ND ND 63 8 MW-3/8-5-94 810 1500 ND ND ND ND ' 5 4 CONCLUSIONS & RECOMMENDATIONS 5 1 Groundwater Gradient and Flow Direction The groundwater gradient at the site remains very shallow (0 0006 ft/ft) Therefore, small fluctuations in the depth to groundwater in one well can produce a dramatic change in the ' flow direction Initially, the flow direction was calculated to be southwest (May 1994) HoweNer, in August 1994, the flow direction was northwest ' Historically, other sites in the vicinity have shown a great N'anation of flow diiections throughout the year Long term groundAater monitonng has taken place approximately 2 miles northwest of RFS at the Southwest Hide Company The groundwater gradient ' consistantly inclined downward steep and directed to the north between Apnl and August However, the gradient became more shallow between September and March, and generally shifted towards the west A consistent groundwater flow direction has not been determined yet at the site Without a consistent flow direction, it may be impractical to determine the downgradient extent of petroleum hydrocarbons at this time Therefore, we recommend that the depth to groundwater be monitored on a monthly basis during the next quarter (September to November 1994), attempting to determine groundwater flow direction 5.2 Hydrocarbon Impacted Groundwater ' Hydrocarbon impacted groundwater is present in all three monitoring wells on-site As in C—I.F.l Audra S.—Inc '7 Rryvn Rrn S.—QRIB�A2�5