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SITF BACKGROUND (ht Oetobei 10 1991 batten F (lomeS 1~tea�atino ine of Rio Vista (alifornia CXLavatLd and ie.nlovc.il three 1'S l s ( T K I Th-' and 1K3)) horn the Site The t STS t_ontained g9asoline and diesel fuel X (candor representative waS on site doling the US I removal to collect soil samples File field ac.tivitieS were observed by ( arol 0/ of the PIIS/EIID A Small hole was found on the lowf,l fill end of TK3 (diesei tank) Petto]cum Staining and odols wcic noted in till. 1,011 beneath tht formel Ideations of the USTs Gr011ndwater was not cnunintLrccl dursng the l S i Iesnoval Six soli Sample', were collected by ( ondor frotm the IJS f LvLavation at depths of t) to I' lett befnw the ground ',urtace 1 he sample,, were analyzed for TPH-(, {gasolmc) B I LN 1 LPH (dILI,Ll) 11)13 feth\iene dibiomide) and total lead Laboiator,, analyse,, indicated elevated vo1ict11ttatui1ls of 1 PH-(i I LP1I and 1311,\ constituents in the Soil Samples For additional information ieter to Tank Pull I csrrni~ Rc shits pteparLd b. ( ondot elated November IS 199] ' At the dncetton (It the PIIS/1 HD ( ondor picpared a kvoik plan to InveStlgate the ga',01111L and diesel coittainlriatioil 1',SOLiated with the fortner US fs (Awl incl Giounduuter 1pwestrgulmn Work Plan dated May 30 1995) 1lie work plan was approved by the PHSYFITD and the Reclamation District 92029 On August 22 1995 three hydropurtch boreholes (I IP-1, IIP-2 and IIP-3) were drilled at tilt., ',rte (see the fibure attached to the back of Appendix B for borehole locations) Ronald Rowe of the PIIS/El1D was on site periodically to observe the fieldwork (rilbert ( osio of 'Murray, Burns and Kienlen 1 ngineering was on site to observe the drilling aLtl',itics as a Reclamation Distrzet representative fwo of the hydropuneh borehoies (11P-1 and HP-2) \,kLrc located on the Icvee and were drilled to depths of approximately 16 and 1 1 feet helow the top of the le\ee (btl) respectively the third hydroptinch borcholc (IEP-3) was located below the levee and was drilled to a depth of approximately 6 feet beiow ground Surface (bgs) Sot] Samples were eoflected at five toot intervals (,roundwatcr ',ample.', wise eol[ceted using a l lydropunch 11 groundwater Sampler (,asoline odors were noted in each borehole l aboratoi} ana]vse,, indicated t,c}ricentratioris of I-PH-(, and B 11=X in the soi[ and groundwater Samples analwed from eaeh borLI101L (See I able,, 13 1 and B 2 bclo%v) I1"ABLE B 1 Laboratory Results (Soil- August 1995) B T E X TPH-G TEPH Detection 50 so 50 so 10 1 0-10 Sample t D Limits mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg 1433-11x'1-11 (4) 1 200 3 100 5 500 22 000 300 190(diesel) 1432-111'2-1 1 0) N1) ND 130 2 800 22 ND 1432-11P3-5 � 61 118 52 91 7 5 16(diesel) Note 1 ht,last number in each simple lri indicates the depth at which the sample was collected (nit( unNersions Analytical mg/kg pacts per million(ppm) B rEX benzene tolut.nr. ethyl benzene and total xylenes rP1141 total petrnieum hydrocarbons quantified as gasoline rEPH=total extractable petroleum hydrocarbons quantified as diesal motor oil and kerosene ND now.detected at or above,laboratory detection limits 4 efe.tecuon limits rai,;O due to gasoline.intcrterencc.