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i <br /> SUMMARY & RECOMMENDATIONS: <br /> i <br /> The latest work reveals that the lateral limits of groundwater contamination extend <br /> farther to the north than expected from prior work. In fact, MW-6, the farthest from <br /> the removed UST, measured the highest levels of MTBE of any of the wells sampled. <br /> (see TABLE IX.) BTEC &TPHg were not detected in any of the soil samples for <br /> MW-5 or MW-6; however, MTBE was present at 25' in the soil sample from MW-5, <br /> and in soil samples at 10',15',20', & 25' from MW-6. Refer to TABLE V for amounts <br /> detected. These anomalous readings might indicate another source near the north <br /> end of the property which has yet to be identified. <br /> Based upon the results of this latest work, we recommend the following: <br /> The 6 wells be sampled and analyzed on a quarterly schedule for at least 2 <br /> events. <br /> • Conduct an extensive receptor survey of the area, especially to the west, north, <br /> and east. <br /> Further investigative work will depend upon the results of laboratory analyses and <br /> the receptor survey. <br /> Will" mZu <br /> nter, RG S�E,a�c cFolo <br /> W . J r &Associates ��`� Hut ER <br /> October 6, 2000 <br /> cc: Valley Wholesale Drug Co. <br /> CVRWQCB - Marty Hartzell * N0.8W <br /> P <br /> OF CAVF�� <br /> Wm. J.Hunter&Associates 7 <br />