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C A M B R I A <br /> Monthly Flow Data Between November 21 and December 23, 2002, the total discharge was <br /> 157,960 gallons, which corresponds to an average flow rate of 3 4 gallons per minute <br /> Discussion For the past five months of monitoring, the results of Total Petroleum Hydrocarbon <br /> (TPH) analysis by EPA method 1664(oil and grease)have been consistently nondetect at a reporting <br /> limit of 1,000 parts per billion (ppb), which is equivalent to I milligram per liter(mg/L) Since there <br /> is no source of hydrocarbons within the oil and grease range at our site,and since this constituent has <br /> not been detected at a level that is two orders of magnitude smaller than the discharge limit of <br /> 100 mg/L, we respectfully request that this analysis be excluded from the self-monitoring sample <br /> program for the subject site Cambria will continue to sample for total petroleum hydrocarbons as <br /> gasoline(TPHg),i e gasoline range organics,which we know to be present in groundwater beneath <br /> the site <br /> CLOSING <br /> The signed certification statement is included as Appendix B Thank you for your assistance with this <br /> project Please call Cynthia Vasko at(707) 933-2370 if you have any questions <br /> Sincerely, <br /> Cambria Environmental Technology, Inc. <br /> V <br /> A�-r— <br /> Cynthia Vasko <br /> Senior Staff Engineer <br /> Joe W Neely <br /> Project Manager <br /> Attachments <br /> Table 1 Groundwater Extraction System Analytical Results <br /> Appendix A Groundwater Extraction System Certified Analytical Report <br /> Appendix B Certification Statement <br /> cc Karen Petryna, Shell Oil Products US <br /> Mike Infurna, San Joaquin County Environmental Health Department <br /> 0783 2 <br />