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ll? Release and Site Charac`�r._,don Information (continued) <br /> Maximum Documented Cantamf;..,it Concentrations --Before and After C" <br /> ' Contaminant Sail (gpm) 4 Water (ppm) CanramicraisL Sail (ppm} Wter (ppm) <br /> I Beforel I Afterz I Sei'ore3 I Aft±r4 I I I Beforet I After 113efbre After <br /> TPH (Gasl3FHC) 3.800 3,304 «.D <Z.0 Ethylbes=ne NA 64 <4.U045 <D.D005 ; 4 <br /> TPH (D(esel) NA NA NA Xylene � Z2Q 224 <0-0(105 <0.D405 f <br /> I Benzene � Z'L 8.7 <0.0005 W.0003 <br /> i Toluene 110 79 <0.0005 <t1.0005 1UITSE NA NA NA NA <br /> l Comments: NA: Not analyzed_ i <br /> 1. Sail sample, SJM82/A coilected on 8128/86 at 25 Leet below ground s lurtace(bgs) kom beneath the fanner gasoline <br /> If I tank I <br /> 2. Sail sample, SH31,was collected an 10/28/86 at 31 5eetwhich was the bottom of the excavation. Subsequent soil <br /> barings were dnlled and sampled to determine the extent of the remaining sail�cantaminalian. T he last sort samples <br /> I which were collected indicated remaining contamination(ppm)at 30 feat bgs of <5.0 benzene.5.0 taiuene.36 <br /> ethylbenzene,290 xylene, and 2.1 00 TIPH-gas. I # <br /> 13. Groundwater sample collected on 113G187 from AhVI. l <br /> 14. Groundwater sample coUected an 12/9196 from MWS. <br /> IV. Closure <br /> Does completed corrective action protect existing benencal uses per the Ri6gionalj Board Basin Plan? Yes. <br /> Does completed corrective action protect potential beneficial uses per the Regional Sward Basin Pian? Yes. <br />'f E <br /> Does corrective action protect public Health fcr current land use? Yes. I� <br /> Site management requirements: None. <br /> { Should corrective action be reviewed if land use changes? Yes. <br /> { MenitorinV/apar wells decommissioned: Ye-5 Number 0ecorhmissidned:, Number retained: Q I <br /> u <br /> List enforcement actions taken: NCR dated 2110192 <br /> i List enforcement actions rescinded: None <br /> Local Agency-Recresentadve Hata <br /> i Name: Donna Heran Tide: OW—or a iEnvircrimenmi Health <br /> Signature: -- _. - Date: <br /> !a <br /> A. Central Valle/ Regional Water Quality Control Board(RB) Notficatian <br /> Date Submitted to RB: i�-7 I Respons d Date: 7 IS <br /> 14 R8 Stai J. Srathovde t i Response: <br /> Tile:Assoc Eng Geologist <br /> VII, Additional Comments, Data, etc. <br /> Karla Brasaemle, R.G.#6077 stated that the site should be dosed with no fiuther hvestigative or monitoring actions <br /> required_ Karla Brasaemle stated that it was highly un#�ir ce#y ttmtcarEtafranar.1 will impact groundwater at the site Ser several ` <br /> I reasons: 1) The predominantly asphalt surface prevents surface water inn-#rating the vadose zone and transporting i <br /> contamination down to the water table: 2) The contaminant source. -Le.the gasehne UST and a large portion of the j <br /> cantamminant mass have been removed: 3) The residual soil contamination will degrade aver time:and 4)Contamination in <br /> samples =1 ected below 31 %et bgs were detected at very law carx=tradciks compared to concentrations in samples <br /> Collected alcove 31 feet bgs. I� <br /> This document and the related CASE CLOSURE L.c'" i r_ and shad be retained by the.load agencf as part of.the offlcw site file_ <br /> Page 2 of 2 <br /> it <br /> � I <br />