FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

0$/11/03 _MON 16:00 FAX 19258272029 SHAW E & I Z004 Ms. Margaret 1 agorio August 11, 2003 Page 2 The results of he analysis detected TPH-D in one of the dispenser island samples [DI-01(5'/Z')] at a concentrat:on of 210 parts per million(ppm). No other I etroleum hydrocarbon analytes were detected in any of the remaining soil samples. Over-Excava lion Activities In order to reraove the impacted soils underlying the dispe:aser island, SBC has requested that Gettler over-e:Ecavate the area under the supervision of S liaw personnel. The planned over- excavation ar(a is delineated in Figure 1. Based on tho relatively low concentrations and mobility of di nel, Shaw anticipates that the excavation area will be deepened to a depth of approximately 7.5 feet below surface grade (bsg), two feet b elow the original sample depth, and widened an ad iitional two feet in the area of the former displ:nser island Following over-excavation,one verification soil sample wia be collected from the newly excavated area. The confirmation soil sample will be sent tc McCampbell on a 24-hour turnaround tirr.e. The soil sample will be analyzed for the same laboratory analytes as before (TPH-D,TPH-G,BTEX, and five fuel oxygenates). Upon receipt c f the analytical results, in the event the verific;tion soil sample cavae back non- detect or beloN r San Joaquin County Environmental Health Department guidelines,the tank excavation wi:l be backfilled using the original soil stockpile; (which carne back as non-detect) and imported clean fill material. Soils generated during ova:-excavation activities will be transported of:-site for disposal. In the event the verification sample contains petroleum hydrocarbons above the San Joaquin County Environmental Health Department cleanup guidelines,the excavation will be further widened and degjcried,with additional verification samples collected as required. The removed, oils will be segregated and stockpiled adjacent to the edge of the tank excavation for future disposal,pending analytical results. It is anticipatard any impacted soils will be shipped as non-bazard,)us waste to Forward Landfill in Stockton, California for disposal. In the event analytical resu Its indicate the soil is hazardous,the soil will.:likely be transported to the Kettleman Hill Landfill in Kettleman City, California for des posal. It is anticipated Denbeste Transportatioi L will provide transportation of any impacted soils to the appropriate landfall. If you have any questions or concerns,please contact me at (925)288-2119. Thank you for your assistance in t its matter! Sincerely, Shaw Enviro amental,Inc. Rob Delnagr� Project Manager