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Mr.Harlin Knoll <br /> San Joaquin County Health Department <br /> August 13, 2004 <br /> Page 2 <br /> (DIPS),and ethyl tertiary butyl-ether(ETBE)using EPA.Test Wethod 8260B. Kiff Analytical Labs, Inc. (Kiff <br /> Analytical) of Davis,-,California, a California state-certifier) laboratory, performed the chemical analyses. The <br /> analytical laboratory report, including chain-of-custody documentation, is presented in Enclosure C. <br /> Laboratory analyses results for the second quarter 2004 sampling event are presented in Table I and <br /> concentrations of MTBE, benzene, and total petroleum by carbons in the gasoline and diesel ranges are 1 <br /> shown on Figure 4. <br /> Conclusions <br /> ■ Monitoring wells MW_1 and MW-2 showed an incre c of TPH in the diesel range. <br /> ■ The concentration of MTBE in MW-1 increased sligh ly. <br /> ■ The groundwater flow direction trend from December 2003 to March 2004 remained stable at south- <br /> southeast across the site. <br /> Future Work <br /> The next groundwater monitoring event will be performed in July or August 2004. As soon as right-or entry is <br /> obtained,an off-site monitoring well will be installed southeas of MW-I. <br /> Remarks <br /> The recommendations contained in this report represent Delta's professional opinions based upon the currently <br /> available information and are arrived at in accordance with-currently acceptable professional standards. This <br /> report is based upon a specific scope of work requested by the client. The contract between Delta and its client <br /> outlines the scope of work, and only those tasks specifically authorized by the contract or outlined in this <br /> report were performed. This report is intended only for the e of Delta's client and anyone else specifically <br /> listed-on-this report. Delta will not and cannot.be liable for unauthorized reliance by any other third party. <br /> Other than as contained in this paragraph,Delta makes no express or limited warranty as to the contents of this <br /> report. <br /> If you have any questions regarding this project,please contac Jim Brownell at(916)638-2765. <br /> Sincerely, <br /> DELTA ENVIRONMENTAL CONSULTANTS, INC. <br /> BR <br /> Jason M. Mata �SH• yO�� <br /> Staff Technician <br /> ti <br /> * .5078 <br /> ?James R. Brownell,R.G.alifornia Registered Geologist No. 5078 �+ 0r CAL1�p�� <br /> Enclosures <br /> cc: Mr. Jeffrey Baker,Tesoro Environmental Resources Company <br /> Mr. Chuck Baker,USA Petroleum <br />