ARCHIVED REPORTS_XR0010423 - Laserfiche WebLink

Home Browse Search

3.0 FINDINGS Versar's findings are based on the results of observations and data collected during field investigations and laboratory analyses of soil and groundwater samples Analyses were performed by a California Department of Health Services-certified laboratory, using State, Federal, and industry standard methods Copies of the laboratory analyt;cal results are included as Appendix C 3.1 AASF A total of four soil samples and one grab-groundwater sample Aere collected fiom boring B28 Extiactable petroleum hydrocarbons in the diesel/het fuel range were detected in the two and five foot samples at a maximum concentration of 420 mg/kg Extractable petioleuin hydrocarbons were not detected in the remaining samples collected from 10 feet and 20 feet bgs Tlie laboratory analytical results are summarized in Table 1 Groundwater samples were collected fiom tluee groundwater monitoring wells on Mar ch 8, 2004 Laboratory analysis of groundwater samples collected from monitoring wells MW-I, WAI-2 and MW-3 did not detect concentrations of extractable petroleunn hydrocarbons in the diesel or jet fuel range or volatile hydrocarbons (including fuel oxygenates) One groundwater sample, collected from monitoring well MW-2 contained 0 110 rig/L of TPH-g Table 2 . surnrnanzes the results of groundwater monitoring 32 CSMS Foul soil samples and one grab-groundwater sample NA ere collected fiom boring B29, located north of the velucle A ash rack in the CSMS building (Figure 4) Laboratory analysis did not detect concentrations of extractable hydrocarbons or PCBs in any of the samples Table 3 surnrnanzes the laboratory analytical results fiom CSMS sampling Thirty soil samples were collected frons 10 borings along the north boundary drainage ditch Laboratory analysis detected 20 mg/kg of oil-range hydrocaibons in one near-surface sample (Boring DD6 at 0 5 foot bgs) Laboratory analysis did not detect concentrations of extractable hydrocarbons in any of the other 29 sar-nples Metals concentrations detected in the samples were all below applicable regulatory guidelines (Table 3) Two soil samples were collected from boring B l Ob, located near the waste storage area Laboratory analysis did not detect concentrations of extractable hydrocarbons in either of the samples Metals concentrations detected in the samples were all below regulatory thresholds far residential soils One soil sample was collected from boring B 11, located new the sandblasting area Labor atory analysis did not detect concentrations of extractable hydrocarbons purgeable hydrocarbons, of IsVOCs, or actionable concentrations of heavy metals, in the sample 104700 4 766 230108sEPT2004