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' Quarterly Groundwater Monitoring Report Exxon Station 7-3330 <br />' ppm parts per million (mg/L) <br /> ppb parts per billion (pg/L) <br />' ND Not Detected (below method detection limit) <br /> NA Not Anal red <br /> 3175 Kemer Boulevard Suite E • San Rafael CA 94901 • (415)257-4801 FAX (415)257 4805 <br /> l <br />