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1 <br /> . 1.0 EXECUTIVE SUMMARY <br /> Avalon Environmental Consultants, Inc (Avalon), conducted a Fourth Quarter <br /> Groundwater Monitoring at the request of Mr Kashmar Singh and Mr Dalwlnder <br /> Dhoot, owners of Joe's Truck Plaza The assessment was performed at the Joe's Truck <br /> Plaza located at 15600 South Harlan Road, Lathrop, County of San Joaquin, California, <br /> on December 10, 2002 <br /> F <br /> On December 10, 2002, ten groundwater monitoring wells were purged and sampled <br /> on the subject property Groundwater samples were analyzed for Total Petroleum <br /> Hydrocarbons as gasoline (TPHg), Benzene, Toluene, Ethyl benzene and Xylene <br /> (BTEX), Lead scavengers (1,2-DCA and EDB), and Oxygenates including Ethanol and <br /> Methanol <br /> Six of the ten groundwater monitoring wells on the subject property detected Methyl-t- <br /> butyl-ether(MTBE) The highest detection of MTBE encountered is 400 parts per bil I ion <br /> (ppb) found in groundwater monitoring well MW-2,which is located east of the current <br /> tank farm Monitoring well MWO-1X continues to decrease from previous levels, <br /> having 94 ppb MTBE MTBE was detected for the second time in offsite monitoring <br /> well MWO-2 at a concentration of 11 ppb Based upon groundwater measurements <br /> taken at the subject property on December 10, 2002, the groundwater gradient is to <br /> . toward the northeast <br /> 2.0 GROUNDWATER SAMPLING PROCEDURES <br /> All wells were purged until the pH, conductivity and temperature stabilized or until at <br /> least three well volumes were evacuated The pumping rate during the purging of all <br /> 1 wells was approximately one gallon per minute (gpm) A total volume of <br /> approximately 5 to 6 gallons were discharged from each well All purged groundwater <br /> was collected in 55-gallon, Department of Transportation (DOT) approved drums, <br /> sealed and temporarily stored on-site pending disposal based on the laboratory results <br /> 1 Before initiating sampling activities, measurements of the depth to water and depth to <br /> bottom of the well casing were made to determine the well volume for all wells A <br /> minimum of three well volumes were purged from all monitoring wells before <br /> collecting groundwater samples <br /> The pH, temperature, and specific conductivity of the groundwater were measured <br /> during the well purging phase The final measurements were compared with physical <br /> water quality data obtained during well development to ensure that aquifer water was <br /> inside the well casing before collecting samples A summary of the field measurements <br /> during well purging is presented in Appendix II The water samples were collected <br /> 1 with hand held PVC disposable bailers Sample containers were labeled and chilled <br /> Avalon Environmental Consultants Project#9627-001-13 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> January 21,2003 1 Lathrop, California <br /> 1 <br />