WORK PLANS - Laserfiche WebLink

Home Browse Search

lh Salvo Tricking Facility-GIVVP ' September 27,1994 Page-2- I _= .Excavated soil was visually inspected for petroleum staining and screened with a portable organic vapor analyzer (OVA). Groundwater was not encountered during the tank'removal or over-excavation. A total of 3 soil samples.were collected from the over-excavated area. Two soil samples were collected from the east sidewall at-approximately 15 feet below ground surface and one_soil_sample - was collected from the floor at a depth.of approximately 15.5 feet,below ground surface. Laboratoryr Can�al�§e—s indicated-6:2-µllkg coluenT a and 16 —97A xyle -i.-i.lie=sample collecteFd-from the-flaor-of the excavation. L:2boratory analyses of the soil samples collected-from«the east-sidewail indicated W. - F.>•ldeiic— o*I cc� af`llydrocarbonstituel?ts,analyzed_for,at fire-eparted laboratoz . detection Iimit`s: NO petroleum staining, odors-or OVA readings were noted during the over-excavation. Based on the results of field observations and laboratory analyses, the lateral extent of soil contamination at the site , has been evaluated. - - 7. The soil encountered-during the over-excavation as light brown, silty, fine-.to medium ` grained sand from the ground surface to a(depth of.appy ximately 13 feet.-'From approximately 13 feet to 15.5 feet, fine- to course sand was present.- Very _moist soil,was-encountered in the floor of the over-excavation. The:Spring, l988,_§a-r Jaanuin-Cou' 1q F-lood-Control and Water-Conservation fristrlct.map xndicates,the depth togroundwater..at-the sit has been-as-shallow-as approximately#end :. feet,below,the groursdrsurface� - - 3.0 PROPOSED SCOPE OF WORK` - Condor recomnlends a phased investigation of&►r undwater at the Di Salvo Trucking facility. The flrst phase of the investigation will include the—colle LLtion-of one Hydropunch groundwater sample, near the ea-t-end of-the-former locatioii_of�TK4. The purpose of the boring is-to investigate the potential for groundwater contamination at the site 1. h drocarbon,constituents are detected•in-the .CHydropunch-groundwater-sample, a secand_phase-of my shgation will,be.implemented. Thbe�-5-second phase-of investigation`will consist of installing three monitor-wells.in-a-triangula paw ttern.around•the-east-end.of:-TK41 San�Joaquin CounV Flood Control and Water Conservation -# District maps indicate that the regional;groundwater flo diction.in the vicinity of the Di Salvo Trucking site is toward-the southwest.o No records were vailable from San Joaquin County_ Environmental Health Division`(SJCEHD) indicating the local groundwater flow direction,in,the vicinity of the Di Salvo Trucking site.,, Condor anticipates the current depth-to-water at the Di Salvo - L� CONDOR