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containment area between MW's No 1 and No 6 in November 2004 revealed ground contamination levels upwards to 11,000 ppm of diesel (C10-C28) and 14,000 ppm of motor oil (C16-C36) type extractable hydrocarbons Continual access to this area is important to WOS for material handling at the Acampo facility ' Offsite Groundwater Quality ' Sampling of groundwater in the adjacent parcel wrapping around the site on both the north and east sides has been accomplished using hydropunch collection on three occasions Holes were bored in an arc pattern stepping further out from the suspected source in an effort to find the "leading edge" or "non-detect limits of the presumed advancing plume While detected levels of diesel were generally less than 0 10 mg/ltr and expected to decrease with distance from the source there were higher levels detected beyond the earlier apparent plume boundary The results of testing are presented graphically in ATTACHMENT 10, "SITE DRAWING" Down gradient and potential receptor wells ' A survey of all recorded wells, both domestic and agriculture, in the surrounding 2,000 Ft was conducted in September 2003 California State Department of Water ' Resources (DWR) records were reviewed and tabulated Casual field verification of well locations was accomplished but home owners were not queried about details of pump installation, quality of water nor their wells tested With the last round of hydropunch sampling and the remaining lack of definition of the plume's leading edge or non-detect point it is conceivable that traces of diesel may ' extend to the proximity of several domestic wells along the south side of Woobndge Road Sampled levels are less than 100 ppb or 0 100 mg/Itr several hundred feet distance from potential receptors at a depth of 50-60 FT below ground surface The pollutant of concern is diesel with a very low potential for dissolution into ground water DWR records indicate that working down gradient wells are cased down over 300 FT Most, if not all potentially affected wells were new replacement wells constructed in the 1980's specifically to lower depths to preclude infiltration of shallow ground water contaminated with brine from the Victor Fine Foods facility The level of protection afforded to protect from brine intrusion would afford similar if not greater protection for ' the well users from the WOS site's release of diesel Offsite well information is provided in ATTACHMENT 10,"OFFSITE WELL SURVEY" 1 5 1