ARCHIVED REPORTS_XR0008376 - Laserfiche WebLink

Home Browse Search

Problem Assessment Report Page 8 Ranch Market,23569 South Santa Fe Road,Riverbank,CA November 8,2000 ' The concentration of nitrate as NO3 and nitrate plus nitrite as nitrogen (N) found in the two samples is shown below ' Nitrate + Well# Date Nitrate as NO3 Nitrite as N DW-1 8/11/00 78 8 mg/L 17,808 ug/L ' DW-2 9/21/00 60 2 mg/L 13,600 ug/L MCL 45 0 mg1L 10,000 ug/L ' Copies of the laboratory reports and Cham of Custody manifests for the two water samples are provided in Appendix D ' 6.0 ANALYTICAL RESULTS ' 6.1 Results of Soil Sampling Historical soil sample laboratory analytical results for the Ranch Market site, including results Iof samples collected during the assessment in June, July, and August 2000, are summarized in Table 1 Copies of the analytical data are included in Appendix D ' The analytical results from soil samples collected at the Ranch Market site indicate petroleum hydrocarbons are present in the soil underlying the location of the former UST pit from 10 to ' approximately 35 feet bgs The gasoline appears to have migrated laterally from below the tank pit, creating a 10-foot thick smear-zone from 20 to 30 feet bgs, adjacent to the location of the former UST pit and down gradient of the Ranch Market property The smear-zone is ' evidenced by reported concentrations above detection limits for benzene, toluene, ethyl benzene, TPHg, and MtBE in borings AS-1, V-1, V-2, V-3, GP-2 and S13-2, which are located underlying or immediately adjacent to the location of the former UST pit The maximum TPHg and benzene concentrations reported in soil are 28,100 mg/kg in sample MW-2 collected at 20 feet bgs and 260 mg/kg reported in AS-1 at 20 feet bgs, respectively ' The maximum MtBE concentration reported at the Site was 1 1 mg/kg, from 20 feet bgs in boring SB-1 The two cross sections show the approximate extent petroleum hydrocarbons adsorbed to soil under and adjacent to the former UST pit 7.0 SVE/AS FEASIBILITY TEST 7.1 Feasibility Test Activities 7.1.1 Scope of Feasibility Test On October 2 and 3, 2000, SECOR performed a SVE/AS feasibility test at the Site SECOR notified the San Joaquin Valley Air Pollution Control District of test procedures and vapor ' abatement equipment prior to initiating field activities A summary of the feasibility test time period and mode of operation is provided below File PAR-report doc SECOR International Incorporated