Laserfiche WebLink
Ms. Marla Guensler <br /> Exxon Company, U.S.A. <br />. April 5, 1995 <br /> Page 2 <br /> benzene, toluene, ethylbenzene, total xylenes and total petroleum hydrocarbons (TPH) as gasoline. <br /> Analytical test results are summarized in Table 2. The ground water samples collected from <br /> monitoring wells MW-3, MW-4, and MW-6 did not contain detectable concentrations of petroleum <br /> hydrocarbons. The ground water sample collected from monitoring well MW-5 on <br /> February 16, 1995, contained benzene at a concentration of 1.3 micrograms per liter (Itg/L), but did <br /> not contain detectable concentrations of other petroleum hydrocarbons. The ground water sample <br /> collected from monitoring well MW-5 on March 31, 1995, contained detectable concentrations of <br /> benzene (16 µg/L), xylenes (0.76 µg/L), and TPH as gasoline (76 (µg/L). Copies of the laboratory <br /> analytical reports are presented in Enclosure B. <br /> Discussion <br /> The increase in petroleum hydrocarbon concentrations in monitoring well MW-5 is likely due to the <br /> increase in the water table elevation bringing the water in contact with soil containing petroleum <br /> hydrocarbons in this limited area. As previously proposed, Delta will use a vacuum truck to purge <br /> MW-5 prior to quarterly sampling in the future. <br /> Future Work <br /> The next quarterly monitoring event for this site is scheduled for May 1995. <br /> Remarks/Signatures <br /> The interpretations contained in this report represent our professional opinions, and are based in part, <br /> on information supplied by the client. These opinions are based on currently available information <br /> and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at <br /> this time and location. Other than this, no warranty is implied or intended. <br /> Delta recommends that copies of this report be forwarded to the following agencies: <br /> Mr. Mike Infurna Ms. Elizabeth Thayer <br /> Environmental Management Division California Regional Water Quality Control Board, <br /> Public Health Services Central Valley Region <br /> San Joaquin County 3443 Routier Road <br /> Post Office Box 2009 Sacramento, California 95827-3098 <br /> Stockton, California 95201 <br />