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1 <br /> ' 08 June 2005 <br /> i AGE-NC Project No. 95-0137 <br /> Page 5 of 6 <br /> 3.3. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Dept s to ground water during the May 2005 monitoring event ranged from 22. ?feet(MW,-S5 to <br /> 24.8 'feet (MW_ below the tops of the well casings; the depth to ground water decreased <br /> 1 approximately 1.3 feet since the January 2005 quarterly monitoring event. The calculated ground <br /> water elevations ranged from 3 4.6 8 feet(MW-8),1Wto 3 7.7 7 feet(MW-5);which <br /> ' was well outside the average ground water elevation calculated. <br /> The ground water flow direction was inferred to be northwest, at a ground water gradient of <br /> ' 0. 5 foot/foot(ft/ft)west of well MW-1,down-gradient of the former UST release area(Figure 3). <br /> 3.4. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g,TPH-d and BTEX compounds were not detected in the ground water samples from the op- <br /> site wells at Ripon Farm Service . The fuel additive MTBE was detected in monitoring well MW-4 <br /> for the first time at a concentration of 25 micrograms per liter(µg11). The fuel additive TAME was <br /> detected in the Jimco off-site ground water MW-8 at a concentration of 6.4 pg/l.-- AISO _pgn64- 0�S � <br /> liegn,el., rr!•t���'110 <br /> The lead scavenger 1,2-DCA was'! hitected in the samples from well MW-4, the off-site wells <br /> MW-9 and MW-10 at concentrations of 57 pg/l, 78 µg/l and 73 pg/l, respectively. <br /> P <br /> The analytical results are summarized in Table s_2 andfA copy of the laboratory report (CTEL <br /> Project Number CT214-0505046), quality assurance/quality control (QA/QC)report, and chain of <br /> custody form are included in Appendix E. <br /> 3.5. GEOTRACKER CONFIRMATIONS <br /> Documents confirming the upload of soil and ground water laboratory reports in electronic <br /> deliverable format (EDF) files and depth to water measurements to GeoTracker are included in <br /> Appendix F. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> ' Based on the data collected from the site, AGE finds: <br /> • The off-site stratigraphy consisted silt to a depth of 25 feet bsg with fine to medium sands <br /> with silt comprising an semi-confined shallow aquifer. -rhet 41.6 r f t'Yf'"e q'a <br /> 1 � 1 <br /> Advanced GeoEnvironmental,laa <br />