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IIhL ILiurth LluartLr 1999 lrionitoring evLnt tiverL `aCIM,111v LonsrstLnt with histonLal quartLrl-N -'iuun(lwatLi anaNtiLal data 13enicnL and total rvlenes weiL detected tot thL seLorid time iii L11L giotnuiwatLr Sample L.olleLted iroin ,M'W-3 Oroundwater elevation measurements Lol€Lctcd at the site on DeLember 22 1999 Indicated that ihL 1vLiaLTTL (ILpth to groundwater was approximately 6 6 feet below the monitor wLll and Silt face water station nicasuring points flits aNciage depth to Ovate: was 0 1 teet greater than measured nn SLptcnibLi I; t999 Groundwater Llc\atron Lontouls for DecLmber ?? 1999 nidiLated that i]iL �2101.111dw ttLI uiadtcnt at thL SitL Nvas S,Lnerally Lonststent vrtth the IrtIstonLal 17rotmdwater graa3iL,nt HIL lahoratni-, anal}tical SUH,1a-L water salnplL data for thL luurth quartLr 1999 monitornig eLLnt wuL "uivally iepreSLntattvL of InstotELal data with the CXLeptton of the first quarter 1999 data Durnta thL lirS1 quartLr 1999 monitorina LNLnt M fB1 was daLctcd in samples DDN and DDS (980 and 3 500 µa'] iespeLtively) at significantly htghcr Loncentrations than in previous and suhsLquLN monitoring LVLnts Additionally the onlr surfaLe water sample deteLtionS of 1 AMF Siert i-.portLd in sainplLs DD\ and DDS daring thL, first quartLr 1999 monitoring event During, thL tot-11th quarter 1999 monitoring event however VI 1131, was dLtLLted in samplLS DUN and IDDS at niuch lower tcmLentrations (2 7 and l > 4g/l rLspcctircly) On March 17 2000 C ondor LonduLted quarterly groundwater and Surface water monitoring at I lennan & I40Ln s Marina IoLatLd at VC11ILL Island 1-Lrry in StoLkton C alttornia I ahoiatory analvt:Lal rLSults of the groundwater Samples LoIlLcted during the First quarter 2000 monitoring L\1Lnt atL renLralk, LoriSrStLnt with historiL,al gtiaiterly groundwatLr�inalvtical data (iroundwatLi L1Lvatmn mLasurements col]LLted at the site on March 17 2000 indicated that the a\LragL LiLpth to rroLindwatLr was approxirnaWly SIC fLLt bLIaW ihL monitor wL11 and island diairiagL LhannLI water SLirtaLe measuring points (,rotmdwatLr elevation Lontours for MarLh 1 7 I '000 MdrLatL-d that thL )rOLtndwatLr gradient at the site is geneially LonSlStent with thL 111staii iLal groundwater �-nadient 11 istoi teal laboratory analytical results indicated that generally low conLentrations of M 1 131 have bLen picsLnt in at least one of the surfacL water samples collected during the surtace water samplrnr Lvents During the iii st quarter 1999 monitoring event however M`1 BL- was detected I in SamplL', DDN and DDS (980 and 3 500 l,ig/l respectively) at significantly higher Loncentrattons than in previous and subsequent monitoring events Additionally, the only surface water sample deteLtions of 1 AME were reported in samples DDN and DDS during the first quarter 1999 monitoring event During the first quarter 2000 monitoring event 'MTBE. was again detLLted at an elevated Loncentratton in Surface water Sample DDS (4,700 }ig/1) lis a ]Lttei datLd June 30, 2000 Mi Rowe of the San loaquin County PI15/1,HD dtreLttd the ,iihmittal tit a work pian amendment to modify the Scope of work proposed in the above rcicrenced work plan and work plan addendum According to Mr Rowe, the work plan amendment was to describe vertical Lharacterization of the potential M I BL plume and be suhmittt,d by August 1, 2000 Condor Subsequently prepared the Status Report and Addendum to the Ybtwk Plan dated July 24, 2000 Mr Rowe approved the work plan amendment in a faxed message dated August 3, 2000 i I i