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TABLE 1 :CHECKUST OF REGO JIRED DATA FOR NO FURTHER ACTION REQUESTS ATV DERGROUND TANK SMS Site Name and Location: Vanco Truck Plaza,1039 W:Charter Way,S kion,San Joaquin County(RB 0391167) y 1 Distance to production walls for municipal,domestic, Ono municipal water supply is located 300'northeast agriculture;Industry and other uses within 2000 feet of-the site. 00 danes0c well Is 1900'nror0rwest and one domestic waft is.1900'south-Of the sfto.. . _ 2. Site maps,to scala,of area firtpacted showing locations of Iri A my 3003,an unauthorrred release frail►the LlSrs any farmer and existing lank systems excavation contours and' sys wn was discovered during dispensers and piping sample local!ons,boring and monitoring well elevation upq rade&- contours,gradients,and nearby surface wafers,-buildiings, streats and.subsurface utilities'.. .. Y 3.f=igures depicting iitholoW(cross section),treatment system SO lrtholow consists of clay,silt,and sand to 700,the dl ms;. "Idepth Investigated. Y 4. Stockpiled soft remaining on-site or cfl-alta dlspesai(quantity), lreaatN.. 300 cubic yards of excavator soil was n to Forward Landfill In Manteca. YJ 5.Mbnitori wells.remaini 02ifte tate,. Seven mor. -rig yirell (MW 1 through NW-7)will be property abandoned. B. Tabulated results of all groundwater Depth to am varied horn IS'to 21'bgs.Groundwater Now elevations and depths to water; dtwaon vadted east to nordmut.Groundwater gradient varied Broin 0.0009!o 0.015fr/le. YJ 7. Tabulated results of ail sampling 'All.date adequately tabularfred In vadfous rvporta.Including closure report. and analyses- Detection limits for confirmation sampling ❑N Lead analyses LyJ 8. Concentratich contours of contaminants found and those remain!ng in soil and The extent 31 the identified groundwater,and both onsite and off-site: cont'anrinatlon shown In applicable. Worts. ElLateral and ©Vertical extent•ofsoil contamination Lateral and ffl.verlical extent of ffwndwater c ontaml stion 9. Zane of influence calculated and assumptions:used for subsurface 1 pmediallon An engineered romadisdon was not.. system and the zone of capture attained for the soil and groundwater n mediation required by the regulatory agency. s stem; 10.Reports/information Unauthorized Release Form Y GA Rs 17 tt+m tlfill to a= E] Weil and boring logs PAR iFRP �y Of er MOW*Repast(W10) Y 1 11.Best Available Technoiogy(BAT)used Gran explanation for nut USTs piping and dispensers trench soil removal and using&4 T natural stterruatfon. 17. Reasons why background wears Minor residual s4 11 and groundwater contaminat h remains W site. noble usl ear _ 13.Mass balance calculation of substance!rested ��u� mates 0.111 Fen—o"or TPH-d remain In groundwoW, _while 40?VW"of TM-d rorndn In sail. versus that ramal 14, assumptions,parameters, calculations and The:on Watay did not require a soli vapor survey,due to the Y model used in risk assessments,and rate and locaof desla f soil mrd groundwater contaminants(mainly 7PHg.. transport modeling; and d In fuel Island),limited fhr+oate them unsaturated rare vapor lnrtduslon/rare chain hydrocarbons,dlstanca.to bulldlrrg(-307.: and no change t site use(service salon).'A midga0an plan was proposed for Nle current orvnara/op+rstbrs to address grana contamin stlon a direct contact teem cont minated soils during suture usrs 15. Rationale why conditions remaining at site Soil and grow contamination reportedly is limited In extent; will not adversely impact water quality,health,or Land use(can W. 69 is not expected to change In the.foresesWe other benefidal uses;and firttrn.Vapor) Ion and resWusl soil contamination risk have been addressed. ual will be res~In 1 - t3y: JLB_ Comments.In May 2009;an'unauthod ked release the US'Ts system was discovered diming dispensers and prprnrg;upgrades fir»m.tlre subject Sita.Based u 1.7 quarters of groundwater monitoring showing a Dale: stable plunge with.declining.concentrations,, Ilm extort of contamina0on remaining In soil and 9/14/2010 groundwater,no fbnoseseble changes In land use,a Ilmlttd threats from groundwater,sop and soil vapor Intrusion,Reglonel Board staff concur with San Joaq n Colony'*Closure Recommendatfon.