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I <br /> Mr.Harlin Knoll <br /> Quarterly Groundwater Monitoring Report,Fourth Quarter 2005 <br /> Delta Project No.D003-007-1 <br /> . February 6,2006 <br /> Page 2 of 2 <br /> (TBA), di-isopropyl ether (DIPE), and ethyl tertiary butyl ether (ETBE) by EPA Test Method 8260B. <br /> Due to a sampling oversight, samples were not tested for total petroleum hydrocarbons as diesel(TPHd). <br /> Kiff Analytical Labs, Inc. (Kill Analytical) of Davis, California, a California state-certified laboratory, <br /> Performed the chemical analyses. The analytical laboratory report, including chain-of-custody <br /> documentation, is included as Enclosure C. Laboratory analyses results for the fourth quarter 2004 <br /> sampling event are presented in Table I and concentrations of MTBE, benzene, and TPHg are shown on <br /> Figure 4. <br /> -C—oncVisions <br /> ■ All of the samples continue to report concentrations of TPHg and benzene below the laboratory <br /> reporting limits of 50 micrograms per liter(pg/L)and 0.50 gg/L, respectively. <br /> ■ The concentration level of MTBE in groundwater collected from MW-I and MW-2 continued <br /> decreasing from levels detected during previous quarters. <br /> Future Work <br /> The next groundwater monitoring event is scheduled for January 2005. Delta is continuing the pursuit of <br /> a right-of-entry agreement with the owner of the adjacent shopping center in order to install a monitoring <br /> well down gradient from the site. <br /> Remarks <br /> The recommendations contained in this report represent Delta's professional opinions based upon the <br /> . currently available information and are arrived at in accordance with currently acceptable professional <br /> standards. This report is based upon a specific scope of work requested by the client. The contract <br /> between Delta and its client outlines the scope of work, and only those tasks specifically authorized by <br /> the contract or outlined in this report were performed. This report is intended only for the use of Delta's <br /> client and anyone else specifically listed on this report. Delta will not and cannot be liable for <br /> unauthorized reliance by any other fourth party. Other than as contained in this paragraph, Delta makes <br /> no express or limited warranty as to the contents of this report. <br /> If you have any questions regarding this project,please contact John Smith at(916)503-1266. <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONS C, <br /> 00F SSIp4,9! <br /> ti�� q•`'B. CA ZY Fy <br /> J mith o <br /> P ject M ger x <br /> No. 52484 r*s <br /> I 21311o,6 <br /> CMI. <br /> omas B. Lawrence,P.E. F CAL�EOR� <br /> California Registered Civil.Engineer No. 52484 <br /> Enclosures <br /> cc: Mr.Jeffrey M. Baker, Tesoro Petroleum Company <br /> . Mr.Chuck Miller,USA Petroleum <br />