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1 EckertC Storage tors e <br /> old Company <br /> 1 757Moffat Blvd, Manteca, California October 29, 1998 <br /> Quarterly Groundwater Sampling Report; October, 1998 Page: 2 <br /> Summary of Analytical Findings <br /> 1 This quarter, September 30, 1998, contaminants were detected in monitoring wells MW-1, <br /> MW-3 and MW-5. <br /> 1 9130198 Benzene, Toluene E-Benzene X leve MTBE Diesel Gasoline <br /> Well u ugAL u u ej u m u m (,uaD <br /> 1 MW-I 3 ...Q 6 i, t 1,4Q0 ....:. 3 2 1} 16 5�Qp <br /> MW 3a:. ...... . :..25 :': ssa ,7a...: ND <br /> .....; �o <br /> 1 MW4 ND ND ND ND ND ND ND <br /> MW-5 ND ND ND ND 9 <<', ND ND <br /> MW-6 ND ND ND ND ND ND ND <br /> 1 <br /> Both gasoline and diesel concentrations increased since the last quarter's monitoring event <br /> ' in April, 1998, while MTBE concentrations decreased in MW-1 and MW-5. New <br /> landscaping covered MW-7 with soil, therefore it was not located. Since the time of <br /> • sampling, MW-7 has been found and will be used in next quarters sampling event. The <br /> ' monitoring wells will be measured, purged and sampled again next quarter, and a new <br /> gradient calculated. A Receptor Well Survey is in process and will be completed in mid <br /> 1 November. <br /> 1 Prepared by: <br /> ' Efto� <br /> DE< �2 <br /> NO. 'Qy <br /> 122 339 <br /> Lee eLano, P. #22339 - exp.9,30- <br /> California Registered Civil Engineer 9 cm-®/��`� <br /> 1 �0F CA��FO <br /> 1 <br /> ason P. Cashman, M.E.M. <br /> ' Environmental Specialist <br /> i <br /> 1 <br /> 1 <br />