ARCHIVED REPORTS_ROY'S AUTO - HISTORICAL (2)

Home Browse Search

diesel (IPHg and TPHd, respectively), benzene, toluene, ethylbenzene, total xylenes (BTEX), halogenated volatile organic compounds (HVOCs), ethylene glycol, CAM 17 metals and total lead. The results of the Kaldveer investigation delineated three possible areas of contamination. "Area I", located in the vicinity of the workshop, had indications of surficial (less than 4.5 feet) petroleum hydrocarbon contamination. One sample collected in this area also had an elevated concentration of lead. "Area H" (located south of the work shop) and "Area III" (made up of three individual locations near the southern portion of the ROW acquisition area) had equivocal evidence of surficial petroleum hydrocarbon contamination. Evidence of petroleum hydrocarbon contamination consisted of detectable levels of TRPH, +/-TPHd. It should be noted that TRPH was not detected in any of the samples collected from a depth of 4.5 feet. Detectable levels of "TPHd" were reported in nearly every sample analyzed, mostly at very low concentrations near the laboratory detection limit. The laboratory reports, however, indicated that all samples that contained detectable "TPHd" were "atypical of diesel fuel." The TPHd results in general are considered by Ground Zero to be highly suspect. TPHg and benzene.were not detected in any sample analyzed. The locations of the three areas are shown on Figure 2. Ethylene glycol was not detected in any sample analyzed. Very low levels of methylene chloride and trichlorofluoromethane ("Freon 11") were reported in a number of samples collected from the CalTrans ROW. The source of the reported methylene chloride was most likely in the laboratory. This compound is a widely used laboratory solvent and not uncommonly contaminates samples in the lab. The source of the Freon may possibly have been the laboratory as well. Apparently, CalTrans excavated and removed suspected contaminated soil from the ROW area. 6_0 Investigations by Ground Zero Analysis, Inc. 6.1 Soil Samplinb-February and March 1997 Ground Zero submitted a Workplan dated September 30, 1996 to San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD). The Workplan proposed focused and random soil sampling on the property as required by the Superior Court. Following consultation with PHS/EHD, a supplemental Workplan clarifying the locations of sampling points and suite of analyses was submitted to PHS/EHD on December 3, 1996. The Workplan was approved on December 16, 1996. On February 24 and 25, 1997, under the supervision of PHS/EHD, Ground Zero personnel obtained twenty three soil samples from eleven locations (A through K) on the property. Depending upon accessibility of location and depth, one or more of three sample collection methods was utilized: collection from excavated trench; collection from boring advanced by hand auger; collection from boring advanced by HSA drill rig. Sampling locations are shown wyskrq*tuksun=wy 3