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Y" <br /> Vis• x, zg 4:A7 WO <br /> 2' 'wwz�'.'oy. �4 <br /> Mr. Chuck Carmel <br /> November 18, 1991 <br /> Page 3 <br /> Analytica!results of current groundwater samples a:,)ng with previous results are summarized in <br /> Table 3 (Exhibit E). The complete laboratory report for the July 1991 sampling :s presented in - <br /> Exhibit F. Figure 2 shows BM and TPH-G cottcentrations for each well sampled. <br /> Discussion <br /> The general groundwater flow direction has not changed at this site since the last groundwater <br /> monitoring (April 1991). Water-level elevations have decreased signcantly with the most <br /> if <br /> notable decreases occurring in wells near the groundwater extraction well. <br /> Monitoring wells PR-1,PR-2,or BHD-2 did not contain detectable concentrations of BE'I'X and <br /> TPH-G: The benzene concentration increased in wells E-2, E-8,E-10,E-11, E-12,and BHD-1. <br /> The ethylbenzene concentration has increased in wells E-2, E-8, E-10, ani E-11 and has <br /> drCrew,PA in well BHD-1. The toluene concentration has increased or remained the same in wells <br /> E-2,;r-R,E-10,E-11,BHD-1,and BHD-2. The xylenes concentration has increased or remained <br /> the vane in wells E-2, E-8, E-10, E-I1, E-12, and BHD-1. Tine TPH-G concentration has <br /> increased in wells E-2, E-10, E-11, E-12, and BHD-1, and has decreased in well E-8. <br /> Fluctuations in the TPH-G and BEr'X levels may be caused by the groundwater extraction <br /> system, but several more quarters of sampling are needed to identify any specific trends. <br /> The purge water generated during this sampling event was transported off site immediately after <br /> f the record of transportation is included in this report <br /> pacging by Armour Petroleum. A copy o <br /> as Exhibit G. <br /> The current groundwater rnonitoring plan will continue through 1991. If you have any questions <br /> about this report,please contact me at (916) 444-0123. <br /> E <br /> "Iety truly yours, <br /> BROWN AND CALDWELL J <br /> :;; <br /> Cr C C,,� lei-;° =Y F.- <br /> r <br /> Steven Misner Jay C Lucas ,,'� <br /> Project Manager California Registered^d"', 9kt.�;0 i <br /> SDM:mkw <br /> Enclosures <br /> i <br /> cc: Mr.Jim Maughan,California Regional Water Quality Control Board.Central Valley Region <br /> Mr. Mary Meays, San Joaquin County Health Department <br /> Mr. Clint Rogers, Chevron <br /> Mr. Frank Tucker, Ciry of Stockton <br /> Mr. Chris Winsor,ARCO products'Company <br /> Brown and Caidweli s69oREPORTs%rmq:Q1rt.RYr <br />