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z Case Closure Summary Page 2 <br /> f ..- <br /> Leaking Underground Fuel Storage Tank Program <br /> ,1 <br /> i III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations - - Before and After Cle}anup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant` Soil <br /> Before After Before` After' {Ppm) Water (Ppm) <br /> i'r Before After Before After <br /> i' TPH (Gas) 85.0' 89.02 <•050 <.050 Ethylbenzene C100' 1.0= <•0005 <.0005 <br /> TPH (Diesel) NANA a NA NA Xylene 1) 7.1' 8.S= <•0005 <•0005 <br /> Benzene <11 .049 <.0005 <•0005 Oil & Grease', <br /> Toluene 2.5' 1.3' <.0005 <.0005 Heavy Metals. ' <br /> Lead 1} '�30' NA <br /> Comments: Groundwater contamination was never detected. Sample notations made for identification: 1. SP-NISP-S on <br /> 12103192. 2. B-19.5' on 07107194. 3. S-105 on 07/07/94. 4. MW-1 on 06130195. 5. MW-1 on 09/26/95. 113 cubic <br />[ yards of contaminated soil was excavated an July 7, 1994. The extent of re,'sidual"soil contamination was defined by four <br /> soil borings, one of which were converted into monitoring wells. The excavation was backfilled with pea gravel. <br /> iq <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional,Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes i5 E <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? No <br /> Monitoring wells decommissioned: (Yes) Number Decommissioned: (1) Numbed retained: (0) <br /> :F <br /> List enforcement actions taken: NOR sent 07/21/93 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> �j 0 <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: f. Date: <br /> VI. Central Valley Regional Water Quality Control Board(RB) Notification <br /> ii• <br /> Date Submitted to RB: Response Date: None. <br /> RB Staff: J. Brathovde Response: None necessary - Soil <br /> Title: Assoc Eng Geologist contamination only site. <br /> 3f <br /> VII. Additional Comments, Data, etc. <br /> Kenneth James Clark, Certified Engineering Geologist EG#1864, with Twinning Laboratories indicated that the estimated 36 <br /> cubic yards of contaminated soil that remains does not pose a threat to groundwater. The residual sail contamination is <br /> confined beneath a maintenance building on the park grounds. The residual masses are estimated as: .0053 lbs benzene, <br /> .014 lbs toluene, .011 lbs ethylbenzene, .092 lbs xylene, 4.2 lbs TPH-gas.'j Monitoring well, MW1 was within 10 feet of <br /> the edge of the excavation. Ii <br /> This document and the related a e retain-ea ylithe lead agency as part of the official 1 <br /> site file. (08124193` Exhibit N Page 2 of 2 <br /> ,.:1.m .,AGI .. t fn- • } 9!{ .��1 1 <br />