ARCHIVED REPORTS_XR0004538 - Laserfiche WebLink

Home Browse Search

Chevron Products Company Page 2 Chevron Station#9-1452 334 East Main Street Ri on California October 29 2001 ASSESSMENT ACTIVITIES AND FINDINGS On July 26, 2001, SECOR supervised Gregg Drilling and Testing, Inc of Martinez, California as they advanced three Geoprobe soil borings to collect soil and groundwater samples for chemical analysis (Figure 2) Each boring was advanced to approximately 40 feet below ground surface (bgs) with soil samples collected every five feet in depth Two soil samples from each of the borings were submitted for chemical analysis A groundwater sample was collected between 36 to 38 feet bgs in each boring and submitted for chemical analysis Samples submitted for chemical analysis were analyzed for purgeable hydrocarbons (i e TPHg) and BTEX using the California Department of Health Services (DHS) Leaking Underground Fuel Tank (LUFT) method, methanol by EPA Method 8015 (modified) and fuel oxygenates methyl tertiary butyl ether(MtBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether(TAME), ethyl tertiary butyl ether (EtBE), tertiary butyl alcohol (TBA), ethylene dibromide (EDB), 1,2 dichloroethane (1,2-DCA), and ethanol by EPA Method 8260B Field and laboratory procedures are included in Attachment B The results of the drilling and testing are described below • Subsurface Conditions. Silty sand to sand was encountered in each of the borings • to the total depth explored of approximately 37 to 40 feet bgs Groundwater was encountered at approximately 32 to 34 feet bgs in each boring Bonng logs are included in Attachment C • Soil Sampling and Analysis. Two soil samples collected from each of the three borings were submitted to the laboratory for analysis Soil analytical results are summarized in Table 1 Analytical reports and chain-of-custody documentation are included in Attachment D MtBE was detected in one soil sample at 0 19 mg/kg in GP-2 at 32 feet bgs No other target analytes were detected above the method reporting limits in the six soil samples analyzed by the laboratory • Groundwater Sampling and Analysis. One groundwater sample per boring was submitted for chemical analysis Groundwater analytical results are presented in Table 2 Analytical reports and chain-of-custody records are presented as Attachment D The groundwater sample collected from Geoprobe boring GP-1 at 36 ft bgs contained MtBE and TAME at concentrations of 79 µg/l and 6 3 µg11, respectively The groundwater sample collected from Geoprobe boring GP-2 at 37 ft bgs contained benzene, xylenes, MtBE, and TAME at concentrations of 0 85 µg/l, 0 51 µg11, 890 µg/l, and 52 µg/l, respectively I 1Chevron1914521R2EPORTS12001 Geoprobe SA&well wp_Rev S doc