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APR-27-2000 12 50 CRMBRIA 510 420 9170 P 01/07 <br /> C A M B R I A <br /> To; Mr. Dale Ramey TRANW__� <br /> �City of Ripon 1 ,fes1��A <br /> ► <br /> fax: (309) 699-2685 1� <br /> Re. Additional Information for REQUEST �`�p �P�� <br /> TO DISCHARGE c1, `�5 <br /> Treated Water to Sanitary Sewer from �Q Sti���\\G <br /> Ground Water Remediation System ����S <br /> Shell-branded Service Station ���� <br /> 341 East Main Q <br /> Ripon, California <br /> Date: Thursday, April 27, 2000 <br /> Mr Ramey - <br /> Additional Information pertaining to Cambria's request to discharge water from the groundwater <br /> extraction (GWE)system at the Shell-branded service station at 341 East Main in Ripon, California <br /> Revised Analytical Results: The laboratory venfed the toluene detection in sample B-1 (taken <br /> between the second and final carbon vessels) by EPA method 8260 The results were a detection <br /> at 0 60 ppb toluene This Is very consistent, especially when you consider that the verification was <br /> done on a different VoA and on a different analytical Instrument <br /> The revised analytical results are attached Although the detection was venfied, note that the effluent <br /> samples are still ND I have no explanation for the detection I am puzzled by the toluene showing <br /> up only in that sample, and not In the sample between the first and second carbon vessels, and by <br /> the fact that activated carbon is very effective at adsorbing toluene The best explanation I can come <br /> up with is some contamination occurred during sampling or transport <br /> Summary of Ground Water Ext ctron: I prepared two tables that summarize the ground water <br /> extraction to date The first table includes all of the analytical results from samples collected when <br /> the system is operating to date The second summarized the volumes removed by the extraction and <br /> treatment system, and the vacuum truck work <br /> We are continuing to haul approximately 4,800 gallons per day from the site to the Shell refinery in <br /> Martinez, CA for disposal This water is not treated by the carbon filtration system at the site <br /> I hope this gives you enough Information to approve the discharge of treated water Cambria would <br /> like to discharge the treated water to the sanitary sewer as <br /> soon as practicable <br /> Oakland c a From the desk of <br /> San Ramon, CA Please call me at (510) 420-3318 if you have any <br /> So no ma, <br /> a, C A questions Owen C. Ratehye,P E <br /> a O t i avid, OR Senior Project Engineer <br /> Csmbna Environmental Technology,Inc. <br /> Owen Ratchye 1144 65th Street,Suite C <br /> Cambria Oakland, CA 9460$ <br /> EnvirwmffnW cc Ron Rowe San Joaauin Countv Environmental <br /> Tedmok y,Inc Health Department (209)468-3433 (510)420-3316 <br /> 04 65th Street Fax (510)420-9170 <br /> ,41te 0 <br /> Oakland,CA 94608 <br /> Tel(510)420-0700 <br /> Fax(570)420-WO <br />