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Memoran <br /> um <br /> Date: 03/10/97 <br /> To:: Margaret Lagorio, Supervising REHS, Unit IV <br /> cc Doug Wilson, Supervising REHS, Unit III <br /> From: Ron Rowe, Sr. REHS, Unit IV <br /> RE: 2701 March Lane, Unocal 76 Products Fuel Dispensing Station <br /> As a result of reviewing the second quarterly monitoring report for the above referenced site it is <br /> apparent that Methyl Tertiary Butyl Ether (MTBE)concentrations are increasing(1800 ug/I to 6100 ug/1) <br /> in the center of this parcel (samples from monitoring well #2 on 09/09/96 and12/06/96). Most <br /> interesting is the relative absence of BTEX and TPH as Gas in all wells although all wells sampled <br /> contain MTBE. See lab data attached. <br /> As a follow up to our 03/06/97 conversations a routine site inspection and observation of quarterly <br /> monitoring/sampling were performed by Michael Kith and myself regarding the new UST system on <br /> 03/07/97 as an effort to proactively respond to potential new releases. Numerous observations were <br /> made which will require more in depth assessment and data collection at this site, and possibly others <br /> in order to attempt to reveal any cause and effect relationships regarding MTBE. In the event MTBE <br /> and or other constituent concentrations increase over time it may be necessary to further investigate the <br /> UST system integrity. <br /> 1. Fuel Hydrocarbon Constituent(FHC) odors were present in all tank inspection sumps. It should be <br /> noted that inhalation of MTBE (odor test) is not recommended understanding the lack of <br /> toxicological data for this substance,other oxygenates and known data for BTEX. <br /> 2. FHC's as free product were present in 2 of 3 tank piping sumps (west ends of diesel and regular <br /> tanks). It is my understanding that this condition is not normal and should be corrected. <br /> 3. Surface drainage receptacles (grated) on-site are located directly in front of and beneath the fuel <br /> dispensers. These drains were observed to exhibit FHC sheen and low level product odor. Is this <br /> placement common, and if so do the City Building and Municipal Utilities Departments approve <br /> these drains? Was a permit issued etc...? Michael Kith indicated he would follow up on this <br /> construction issue. <br /> 4. Monitoring well traffic boxes leak and allow large volumes of surface water to accumulate around <br /> and over the tops of capped monitoring wells #2 and #3 potentially jeopardizing ground water <br /> quality (see site map attached). Unocal has been contacted and have been directed to <br /> immediately repair this conduit to ground water condition. <br /> 1 <br />