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�pw <br /> C <br /> Mr. Chuck Carmel <br /> November 18. 1991 <br /> Page 3 <br /> Analytical results of current groundwater samples along with previous results are summarized in <br /> Table 3 (Exhibit E). The complete laboratory report for the July 1991 sampling is presented in <br /> ExMbit F. Figure 2 shows BETX and TPH-G concentrations 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 significantly with the most <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;`iv and <br /> TPH-G. .The benzene concentration increased in;yells 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, and E-11 and has <br /> decreased in well BHD-1. The toluene concentration has increased or remained the same in wells <br /> E-2,E-8,E-10,E-11,BHD-1,and BHD-2. The xylenes concentration has increased or remained <br /> the same in wells E-2, E-8, E-10, E-11, E-12, and BHD-1. The 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 iPH-G and 13ETX lev--ls 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 /> purging by Armour Petroleum. A copy of the record of transportation is included in this report <br /> as ExhUt G. <br /> The current groundwater monitoring plan will continue through 1991. If you have any questions <br /> about this report, please contact me at (916) 444-0123. <br /> Very truly yours, <br /> BROWN AND CALDWELL <br /> Steven Misner 1 Jay C. Lucas `�, ;b.r,>>1 ,r <br /> ', <br /> Project Manager California Registered Gr~NrgL,#13q <br /> SDM:mkty <br /> Enclosures <br /> cc: Mr.Jim Maughan.California Regional Water Quality Control Board,Centra! Vflley Region <br /> Mr. Mary Meays, San Joaquin County Health Department <br /> Mr. Clint Rogers, Chevron <br /> Mr. Frank Tucker, City of Stockton <br /> Mr. Chris V Ilinsor, ARCO Products Company <br /> Brown and Cahlweii <br /> " - ,, 54'XAEtE'.1aORISWL9Ip1RRlal' <br />