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Eckert Cold Storage Company <br /> 757 Moffat Blvd, Manteca, California April 26, 2000 <br /> Quarterly Groundwater Sampling Report, March 2000 Page: 2 <br /> analyzed using EPA method 524.2. The laboratory analytical data, chain of custody <br /> report, and QA/QC documents can be found in Appendix A of this report <br /> Groundfvater Gradient <br /> The water level measurements from monitoring wells MW-4, MW-6, and MW-7 were <br /> ' used to calculate the gradient and construct a groundwater gradient map (Figure 3). The <br /> gradient for this quarter is N26°W at 0.0026 ft/ft. Historical gradient maps are included <br /> in Appendix C. The groundwater elevation at the site has risen since last quarter by an <br /> ' average of 0.81 feet across the site. <br /> ' Summary of Analytical Findings <br /> This quarter contaminants were detected in MW-1, MW-3, MW-4, MW-6 and MW-8 <br /> (See Table A). All other wells were not sampled during this event. <br /> Table A: Tabular Summary of Groundwater Analytical Data <br /> 1 <br /> 3127/00 Benzene Toluene E-Benzene Xylene MTBE Diesel Gasoline <br /> Well u u u u ug/.L..m m <br /> MW-1 :750 . ; .;, i 10. <br /> MW-3 :.60 7 .. :,.84 : .. 34 ND ND 6 <br /> MW-4 1 0.. .:. . .....:: 6 3. ::. 1 6`. 1 - 3 7::. ND 15 <br /> MW-6 .0.8 :' <br /> 12 ND ND <br /> MW 33.. <br /> :. 9 :` . 47 .. .. 46.::;. 9 0. ND <br /> c' ion is resent this quarter at levels significantly below the maximum <br /> MTBE contamination p <br /> allowable (35 ug[L) set by the State of California for the second consecutive quarter. The <br /> levels of Toluene, Ethyl-benzene, Xylene, Gas, and Diesel are also below the State <br /> MCL's for the second consecutive quarter. Benzene is the only chemical that has been <br /> above its respective MCL. <br /> s� The analysis of the water from the on-site domestic well did not reveal the presence of <br /> contamination. All of the constituents tested using EPA method 524.2 were not detected <br /> at or above the reporting limits. <br /> WIC'will continue to sample the monitoring wells on a quarterly basis. On April 3, 2000 <br /> �r WHF submitted a work plan to San Joaquin County Public Health Services, <br /> Environmental Health division. This future work will be used to define the lateral and <br /> vertical extent of groundwater and soil contamination underlying the subject property. <br /> 1 <br /> j' <br />