ARCHIVED REPORTS_XR0011455 - Laserfiche WebLink

Home Browse Search

' Sunland Gasoline March 10,2004 2085 Fremont Street,Stockton, California Page 2 ' Work Plan for the Lateral and Vertical Extent Of Soil and Groundwater Contamination-Continued 1 below surface grade. Three soil samples were collected from the stockpiled soil removed ' during excavation activities. Figure 3 depicts the locations of the samples collected during the tank removal event on December 15, 1998 and the December 31, 1998 sampling event. On December 31, 1998 a total of eight (8) soils a representative of Precision Enviro-Tech Analytical Laboratory (Figure 3) collected samples from beneath the former product ' piping and dispenser locations. The soil samples submitted for analysis from the vicinity beneath the former UST's, ' product piping, and dispenser locations and from the stockpiled soil were analyzed by EPA method 8015M/5030 for gasoline petroleum hydrocarbons, EPA method 8020 for BTEX, EPA method 8260 for fuel oxygenates (MTBE, TAME, DIPE, ETBE, and TBA), and EPA method 6010 for total lead. The results from these samples indicated that petroleum hydrocarbon contamination is ' present in the vicinity beneath the former UST's, product piping, and dispenser locations. Petroleum hydrocarbon contamination was also detected in the stockpiled soil. BTEX and fuel oxygenate contamination is present in the stockpiled soil and in the vicinity beneath the former UST's and dispenser locations. Lead was found in the soil samples collected from the vicinity beneath the former UST's and product piping locations, but at ' insignificant levels. On February 22, 2000, WHF, Inc. in conjunction with Frontier Drilling completed two (2) ' vertical soil borings. Boring B-1 was completed to a total depth of 81.5 feet and Boring B-2 was completed to a depth of 31.5 feet. Soil and groundwater contamination was shown to be present based on field observations and laboratory analytical data. During ' this scope of work, the extent of the contamination, both laterally and vertically, was not defined. ' In July 2003, WHF, Inc in conjunction with Frontier Drilling Company, a licensed C-57 contractor, completed six (6) soil borings and converted four (4) of the borings to monitoring wells. All soil borings had some detectable petroleum hydrocarbon ' contamination. Groundwater sampling events conducted during October 2003 and January 2004 ' indicated that all four (4) monitoring wells in both events were contaminated by petroleum hydrocarbons. Based on these findings it was concluded that additional ' investigation into both lateral and vertical extent of soil and groundwater contamination is warranted. 1 1