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r Q <br />Wase Closure Summary Pagel2 <br />Leaking4nderground Fuel Storage Tank Pram <br />TTT RalAamA and Site Characterization information (continued) <br />Maximum Documented Contaminant Concentrations --Before and After Cleanup <br />Does completed corrective action protect potential benef ciaL uses per the Regional Board <br />Basin Plan? (Yes) No <br />Contaminant <br />Soil (ppm) <br />Water (ppm) <br />Contaminant <br />Soil (ppm) <br />Water (ppm) <br />Number Retained: 0 <br />Before After <br />Before After <br />Before After <br />Before After <br />TPH (Gas) <br />NANA <br />NA NA <br />Xylene <br />NA <br /><.2 <br />.0026 <br /><.0005 <br />TPH (Diesel) <br />5500 12 <br />1.3 0.062 <br />Ethylbenzene <br />NA <br />NA <br /><.0005 <br /><.0005 <br />Benzene <br />NA <.2 <br />.0012 <.0005 <br />Oil & Grease <br />Toluene <br />NA <.2 <br />.005 <.0005 <br />Heavy metals <br />MTBE <br />NA NA <br />NA <.050 <br />Lead <br />NA � <br />NA <br />Comments: Highest DTW in MW1 on 6/16/95 and lowest in MW3 on 8/19/94. Concentrations de- <br />tected in soil (before) were obtained from Tank 1 and was subsequently overexcavated.Soil <br />(after) results following Tank 1 excavation. Groundwater (before) was highest concen- <br />trations detected in hydropunch/MW samoles. (After) from most recent samples. <br />IV. Closure <br />Does completed corrective action protect existing beneficial uses per the Regional Board <br />Basin Plan? (Yes) No <br />Does completed corrective action protect potential benef ciaL uses per the Regional Board <br />Basin Plan? (Yes) No <br />Does corrective action protect public health for current) land use? (Yes) No <br />Site management requirements: None following monitoring well destructions. <br />�I r <br />Should corrective action be reviewed if land use changes? Yes (No) <br />Monitoring wells Decommisioned: (Yes)No <br />Number Decommisiozed: 3 <br />Number Retained: 0 <br />List enforcement actions taken: NOR on 3/28/94 <br />I� <br />i <br />List enforcement actions rescinded: None{{ <br />I4 <br />'F <br />V. Local Agency Representative Data <br />Name: Donna Heran Title: Director <br />Signature: Ti <br />Date's: <br />VI. RWQCB Notification <br />JjDate Submitted to RB: IRB Response: k i 11 <br />1IRWQCB Staff Name: J. Brathovde(Title:AssocEngGeologistIlDate;: _, 11 <br />VII. Additional Comments, Data, etc. 1. <br />The onsite facility well sampled in 1987 (TD 100' w/80'casing') was destroyed and a new well <br />installed in 1988 (TD 160' w/120' casing). Karla Brasaemle, RG#6077, estimated that the <br />residual soil contamination associated with former Tank I and!Tank 2 at 1970 yds' w/ ave conc <br />of 6.39 ppm or 32 lbs; former Tank 3 at 24 yd' w/ ave conc of124 ppm or 1.6 lbs; former Tank <br />4 at 56 yds' w/ ave conc of'25 ppm or 3.8 lbs. Based onfithe low concentrations present, less <br />,than 70 ppm at 13' and the depth to groundwater at 421, R. Brasaemle indicated that over <br />time the TPH remaining would naturally degrade through microbial action and that the <br />remaining soil should not pose a threat to groundwater. ; <br />This document and the related CASE CLOSURE LETTER, <br />as part of the official site file. (08/24/93) <br />Exhibit N Page 2 of 2' <br />be retained by the lead agency <br />