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st�asu�Ac�sou AhtA GRairivp WA TZR AssEsSMN7PYaRr RESULTS OF GRdUNDWA,xE Based u o R ASSESSIYIE�T p n results of ESA's first assess ' 'r`4UARY 2Q0 to further delineate MTBE concentrations enter JCEHD the former UST requested an additional groundwater data As discussed above, the oral d in the groundwater near the northern end of were ]'300 NgfL and 14 Y MTBE concentrations detected in to SJCEHD on N°vernlier 2g ESA the the of SJCEHD Addit g a s Groundwater groundwater Ms Dot Lofsrrom 000 for review main focus of the additional Following Assessment WorkPt'an of SJCEHL7 a g a strategy meeting with Ms dete assessment was to obtain sue workplan on December Carol Ox ntiine the extent of MTBE totuber l9, 2000- The the area of the former UST groundwater nl Y, ES tory groundwater samples excavation for analysSs of lead,las re to Y, ESA collected select soil samples in As shown in Figure 4,ESA Installed fourteen b quested b the former Y the SJCEHD rzner UST location Borings TP 9, orin bgs for the ii gs on January IO and ]], Purpose of TP-10' and TP-12 throe h 20pl rn and around groundwater sam lin g representative groundwater g TP-19 were d groundwater-bearing g tool was used to collect iter samples A -Hydra_punchto 25 feet zone from groundwater and finch was collected from 2I to 25 feet b was typicall in-situ at 21 feet bgs and 16 feet b �eet b gi Grotandwater from b y driven Into the gs after two failed attempts to Intense arw gs TP-9and TI'-13 An additional groundwater sample w iter-bearing sedrmen[s and TP-16 to ascertain the p er as collected at 35 feet b the"Hydro-punch,, Potential vertical extern of gs from borings TP-IO bgs Groundwater was tool was driven into the in groundwater ' TP-l4' Tp-IS, as not encountered in burin groundwater-beann At these locations, Proposed borings TP-6, ,-7 g TI'14 at 35 feet bgs so no sample ne from 31 to 35 feet the fieldwork due to sa , Tp-8, and TP-I l am r Vy turated soli conditions ca sad n of accessible to P as collected groundwater samples are su sampling equipment rnmanzed in Table 3 Y heavy rain Laboratory 9 pn1ent during Six soli ry analytical results of borings(TP-]A immediate) "I -4A, TRsq" TJ'-10, was completed durind �the former UST ' TP-14, and Tp-15)cavity to sample soli fora ere drilled total and excavation and re g assessment at the re moval activities did nor an quest of the SJCEHD lead This was collected from the borings aI ze s because ` characteristics were gat 14 feet bgs, Y Rel for lead Previous UST f not At these]orations, a soli sample assessment in lune 200pland eare at rn S , a depth directly beneath the fv g this investigation but rrner UST Soil [ached to this re were included in ES , During sampling, port as Appendix B A s initial water sam ESA field personnel did pies Table 3 not detect Petroleum laboratory analysis rn soil rid rites the concentrations of "'odors or hydrocarbon sheen on the Presence ofTpH_G groundwater Three petroleum compounds d were analyzed far[bend BTEX by EFA groundwater samples erected by Methods $OIs and 8024 ples were analyzed for the and methanol b presence °f MTBE,DIpE, �, Twelve groundwater sample, limits for all analyzed Method 8260 pies Groundwater�E�ETBE' ED] , 3-2 DCA Y con samples were below , TBA, ethanol, EPA Method 6610 contained concentrations samples anal zed for the laboratory detection (rrigJlcg)and 8 8 Y presence m°1kg Laboratoryranging between S g r total lead by analytical reportsmilIigrarns per kilogram are provided in Appendix C Addmonai Groundu aier Assessmen11 t Repvn ESA l2o0i52 h'ianh 26 2001