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the east, south, & west of the UST site . Soil probes A-5 & B-4 determined the soil plume to the east/southeast ; however, there was no water entry from those locations & the limits of the water Plume need further definition in that direction. 2 . MW-2 , located in a downgradient position, indicates that the contamination has moved to the north, which is the indicated direction of groundwater flow. This has been confirmed by the geoprobe sampling, which defined the limits of the soil & water plume to the west, northwest, and southeast . Additional soil probes are scheduled in an attempt to find the "zero" line to the north & northeast . RECOMMENDATIONS : It is recommended that quarterly sampling of MW-3 be discon- tinued; it has not shown any contamination since monitoring began. MW--1 should be sampled during the next quarterly event to determine if the minor amount of toluene & xylene measured in the latest work is repeatable . MW-2 should continue to be sampled until conditions change . Water level measurements should conti- nue in all three wells to determine gradient direction; if major • changes occur, sampling of well #3 should be done again. On November 27 & 28, 1995, eight (8) shallow soil probes were placed on the site and the sidewalk and street for the purpose of defining the lateral extent of the plume. That work revealed that soil & groundwater contamination is present beneath the street northeast of the property; an additional three (3) soil probes, (D-1, D-2 , & D-3, ) were placed on January 4, 1996 in an attempt to determine the limits of the plume . The results of that work will be furnished to the County EHD after receipt of the 1 boratory results and analysis of the data. W Wm J nter & Associates J u �y 5 , 1996 ?:EDGE Q cc . eth Thayer, CVRWQCB S�� O G. Lechich M. Griffin WiLLiAM J.HUNTER * NQ.S5Q CAU�V�� _ • 2