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�" SERVICES, INCORPORATED <br /> H) - <br /> ■'� �® - - - <br /> > <br /> MPDS=UIV0788-03 <br /> =June 10-, -1994 <br /> Unocal Corporation , <br /> 200:0_-- Crow. Canyon yP_1a-e�, -',Suite 1.4O0X <br /> P.0Box 5155 <br />' San -Ram6n,- California -94583 <br /> Attention":.- ' •M's: -Penny L S 'lzer R : <br /> ;x._.: <br /> RE': Quarterly Data,1"eport <br /> D <br /> nocal Bulk= Plaaft 40788`' <br /> 8=203 East 11th `Street.' <br /> Tracy, Califo-rna R <br /> Dear -Ms Silz.er: <br /> This "data. report pxesents the results `of .the: most 'recent quarter_ of <br /> orand - orn , thferencdmonitalhme <br /> site.=by MPDS"Se rvices;:.' Ine`,. <br /> LA { RECENT FIELD .ACTIVIT,IES <br /> 4 :, . The monitoring well61that were monitored and: 'sampled during this <br /> quarter :ar.e . indicated in :T=able. 1 . Prior' to_ .sampling, the wells <br /> were .checked fog depth to water "and' the presence of. "free ,product or , <br /> sheen.' The' monitoring, data` .and the groulid. caater': elevati oris"`. are . <br /> summarized ina. Table 1.. . " The. ground water flow;"directioft during t.h <br /> t - sshori. :.onthemost '°recent: quarer -e <br /> attached; Figure I;.. <br /> A.... <br /> Ground .water sampP. les 'were -dollected on:; May. 12y . 1994. Prior to <br /> Sam- ng,g; . the weals were. .eacrl. purged of.'. between '7'. nd 28 ,gall..ons of <br /> water-:= Dur'i•n.g purging operat 'ons,, ..the f.ield '- -parameters .' pH, <br /> temperature; . and eleet_ rical conductivity '•-were- recorded and are <br /> presented in. Table 2 Once the field-parameters •were •ob served. to <br /> stabi.lize.;. 'and-_where` possible''; a 'rtlihimuM of• ':appraximately, four <br /> casing .volumes had;:.b.`een ;re' ' ed from- each well, .s:amp7es were: then <br /> N collected using a.` clean Teflon .bailer The °samples were decanted <br /> y� into .clean''VOA..via is"oand/or one, liter. amber ;bot tfes, •a . appropri`- <br /> ate }wliic- `were then, sealed' with Teflon.-lined .screw:caps,. labeled' <br /> and stored in;a c'ooaer 'on, ice;:°.until delivery .to d. state-certified <br /> ; . laboratory " MPDS Services, Inc <transport.ed . the purged ground <br /> water.'—,to, the UnocaDI Ref 'inert' ;located in Rodeo', California; for <br /> treatment. and diet,argp ,to'' San :Pablo Bay `.under TPDES: ;permit . <br /> ANALYT.I'CALf RESULTS. <br /> The -.,ground `wdtet. samples ..,,.were enalyZed. :.at .rSequoia: Analytical <br /> Laboratory "..grid were,,,,accompanied by. properly .:.execut:ed Chai.ri. of <br /> 2401 Stahwell Drive, Suite 400,Concord';CA-94520., ,. <br /> EL: (510)'602 'FAX;(510)$89-1918' <br />