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git1'f:li <br /> . i,Y M <br /> ONrI[)RING Ri E'Oi2 f F[RSI' 1161t11iR <br /> U� <br /> 7910 Lower Sacramento���,Stockwn,G�lifnrnia <br /> Shc'.t WIC No.204-7524 <br /> Delia Project Na 40,98-147 <br /> Page 2 <br /> n the soil and <br /> round <br /> vans w�rlc perfarmccl by Delta includes invcs!igatian for cctrolcum constituentu�rtc ly water elevation <br /> previous <br /> water at the site,assisting in the rephtcef ground <br /> d wa=r`forolaborattory analysts The p <br /> ,cvious activities <br /> measurements, and quartcrly sampling u g <br /> orfs re ared by Delta: <br /> performed at the site and results obtained are presented to the following rep p F <br /> Date <br /> Berton April 19,1988 <br /> proposed Work plan March 31,1989 <br /> phase 1 Hydrogeologic Assessment lirork Platt April 6 1989 <br /> Tank Closure Report October 20, 1989 <br /> phase I H}drogeologic Assessment Report October 15,1990 <br /> problem Assessment Report Decen:oer 26,1990 <br /> Quarrerty INortiloritig Report, Fourth Jttarter IY90 <br /> 3�4 1'RO F,cT RFSiJ1 C5 <br /> W-3 on February 1,1991. <br /> 3.1 Ground Nater 1•:levatinn Ratti h1W_2,and IJ. <br /> Depths to ground wntet were measured at monitoring,walls MW-l' w�tcr elevation data collected daring <br /> Ground water elevations are summarized in Table 1. Using ground <br /> r,3 1, 1991,sampling event,the,ground water Ilo'.v direction based an measurements towards lacollecteduo`n <br /> the Feb. ry <br /> gradient of approximately 0.602• Aground water contour map <br /> February 1,1991,is illustrated in Figure 3• <br /> 3.2 Ground!Vater Chemist <br /> and MW-3 on February 11 1991, <br /> Ground water samples were collected fr4s��Iahorat laboratory far analysis of benzene,toluene, <br /> ethylbenzene,and <br /> and were submitted to a Ctlifornia ccr <br /> xylenes(BTEX), <br /> and Iota!petroleum It (1'P11�• Monitoring«'eillocations"re shown <br /> in Figure 2, <br /> lts of <br /> ound <br /> and the chemical results are presented in Table 2. Chemical resu ,wtarerbelo"the analytical method <br /> ,591, indicated that BTEX and TPH concentrationsrc tarts are pry+=nted in <br /> on February 1, ' <br /> will again be collected for chemical analysis of BTEX and 1'P}! in <br /> detection limits in all three monitoring wells. COP of certified laboratory <br /> A,1pc1I A. Ground water samples <br /> may 1991. <br /> WPM <br />��''?"�'"��"�� """ �y�, ,��---���-.rte-�•�*� �,-�.�a ���. �r���• <br /> 13'�".-r��° -'.x.:� # 7T+�`i �n''; i e �'.-t -.•7 _.-1�'A� � '�z �"' 3 _ i �� i._, 7 9r�,} 4 r � � s. <br /> y� ` <br />