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' Eckert Cold Storage Company <br /> 757 Moffat Blvd,Manteca, California May 5, 1995 <br /> Underground Tank Investigation, Phase I Report of Findings Page. 6 <br /> Laboratory analysis of soil samples detected BTEX and Gasoline contamination in the sorts <br /> ' above the water table in borings MW-1, 2 and 3 All sort samples for MW-4 tested "ND" <br /> (Table 1 & Appendix A) TEPH (for Kerosene, Diesel and Motor Oil) tested 'ND" (None <br /> Detected)in all sort samples <br /> 60 Hydrology <br /> California and the Federal Government have mandated that virtually all groundwater is <br /> beneficial for current or future use unless it can be demonstrated that no beneficial use is <br /> ' known <br /> This aquifer is considered to be of beneficial use and as a result, must be protected from <br /> contamination Those identified uses include agriculture and industrial, as well as <br /> potential use for animal or human consumption <br /> 7.0 Groundwater Conditions <br /> Analyses of the three morutonng wells MW-1, 3 & 4 (MW-2 was damaged and is used for <br /> water levels, only) show that contaminants are present MW4 had only 0 41 gg/L of Benzene <br /> ' and is at the edge of the plume <br /> All the wells were resurveyed after the addition of MW4(Appendix F) Another gradient was <br /> calculated from four wells and is also shown as Figure 9 The predominant direction is N25°W <br /> at 0 0021 ft/ft At the time of the installation of the first thzee wells, the gradient was 0 0017 <br /> ft/ft at N39°W (also shown as Figure 9) The s)xface of the site is paved, but the area to the <br /> east is open residential property Recharge from surface precipitation is the probable cause of <br /> the steep gradient to the west With the return of summer, we should see a return of a more <br /> even gradient to the northwest <br /> 8.0 Conclusions &Recommendations <br /> 1 <br /> Soil contamination exists in the area under and around the former underground fuel storage <br /> tanks Groundwater contamination exists as a plume approximately 110 by 170 feet (Figure <br /> 8) Contaminants were BTEX and Gasoline - no Diesel was detected in either sort or water <br /> samples The groundwater plume has been defined only to the northwest, where MW4 had <br /> ' only 0 41 µg/L of Benzene <br />