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R*Vmd for Oft Clo 4 <br /> Charon U.SJ1.Producb 2g!1 ny.5431 Wed Gr■nt Lhu Road,Barka.CA SeOwnbw 23105 <br /> vertical extent of hydrocarbon-impacted soli is dearly minimal and of very low hydrocarbon <br /> concentration,resulting In a very low residual mass of hydrocarbons remaining in place fture 3). <br /> Lack of SignMcant Leachate Potential <br /> Hydrocarbons leaked from the former UST&and found in low concentrations in soil have not impacted <br /> groundwater. Four consentive quarters(one full hydrologic season)of groundwater samples <br /> collected from MWs-1 through 3 on site have been below MDL for STEX and TPH-G. Two additional <br /> sampling events conducted In March 1993 and January 1994 on MW-1 only were below method <br /> detection firnks for BTEX and TPH-G. Although low concentrations of hydrocarbons have been <br /> detected in soli samples collected near the soll/groundwater interface, the mass of hydrocarbons Is <br /> small enough to be completely retarded(sorbed,biodegraded) or prevented from dissolving M <br /> groundwater. Based on the observation of no dissolved hydrocarbons In groundwater over one full <br /> hydrologic season,it can be concluded that mass of hydrocarbons in soil in place on site does not <br /> threaten the present and future beneficial uses of the shallow groundwater. <br /> REQUIRED INFORMATION <br /> Listed below is a summary of the information required for closure requests as outlined in the <br /> Addendum to Appendix A of the Tri-Regfonal Board Stall`Recommendations For Preliminary Evaluation <br /> and investigation of Underground Storage Tanks(CRWQCB-NCR,SFB,CVR, 1990). <br /> 1. Distance to production wells for municipal,domestic,agriculture,industry and other <br /> uses within 2,000 feet of site: <br /> ■ Not Required due to non4mpacted groundwater <br /> 2. Site maps,to scale,of area impacted showing locations of former and existing tank <br /> systems,elevation contours,gradients,and nearby surface waters, buildings,streets <br /> ■ site map showing elevation contours and nearby surface waters <br /> (Figure 1) <br /> ■ site map showing buildings,streets and subsurface utilities(Figure 2) <br /> ■ site map showing locations of former tank systems(Figure 2) _ <br /> ■ site map showing groundwater gradient(Figure 3) <br /> ■ site maps showing areas of impact(Figure 3) <br /> 3. High and low groundwater levels <br /> ■ Table 2 <br /> 4. Tabulated results of all sampling and analyses <br /> ■ Table 1 (Soil) <br /> ■ Table 2(Groundwater) <br /> D161CIo�.rpt <br /> ETID <br /> l CA.CIiNiA/V{ 6 <br />