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-s_ <br /> T <br /> Mr. Chuck Carmel <br /> December 23, 1991 <br /> Page 15 <br /> Discussion <br /> During 1991, groundwater slow direction i n o ftp om north to groundwater table wbeneath het under a nsite 0has <br /> to 0.002) hydraulic gradient. The elevation began in April 1987 A hydroeraph showing <br /> declined approximately 1 foot since monitoring <br /> the elevation of the groundwater table in all wells from 1987 to 1991 is shown on Figure 6. <br /> ons in all wells have behaved <br /> The hydrograph shows that since January 1989, water elevatived <br /> similarly. <br /> ll <br /> The September 1991 analytical data indicates that BETX aTR-4 since the last sampling event in July <br /> tnd'fl'H-G decreased to every We <br /> but ATR-4 (ethylbenzene increased sd �Septin ember 1991, only four contained detectable <br /> 1991. Of the twelve wells sampled <br /> concentrations of BETX or TPH-G• <br /> data shown in Table 3 indicates that BETX concentrations have <br /> A review of the analyticalbegan in 19$7. TPH-G concentrations <br /> decreased in all monitoring wells since monitoring g 1989 Although TPH-G <br /> show a general decrease in ATR-3 and ATP.-4 since FebruarYhe concentrations are more <br /> concentrations in ATR-5 also show a general decrease with time, <br /> erratic. <br /> questions regarding he September 1991 sampling event, please contact me <br /> If you have any q <br /> at (916)4440123. <br /> i <br /> Very truly youM <br /> BROWN AND CA LD _ CONSULTANTS <br /> •} �r�GD�F01., <br /> r�L Lt-L. 3 <br /> J yucas,R <br /> Project Manage <br /> JL:mrp <br /> Enclosures <br /> Califomia Regional Water Quality Control Board. <br /> cc: Mr. Gordon Boggs, <br /> Central Valley Region <br /> Mr. Harlin Knoll, San Joaquin County Local Health District <br /> Mr. Steve Misner, Brown and Caldwell <br /> - _ <br /> .._._... _. <br /> _ _._._Mr.-Claris-�Vinsor,.ARCO.Produtits--Company <br /> -- <br /> grown and CaldwC11 lescxFroaT CrvEQ Pr <br />