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1 <br /> 1.0 EXECUTIVE SUMMARY <br /> Avalon Environmental Consultants, Inc (Avalon), conducted a Second Quarter 2003 <br /> Groundwater Monitoring at the request of Mr Kashmar Singh and Mr Dalwinder <br /> Dhoot, owners of Joe's Truck Plaza The monitoring event was performed at the Joe's <br /> Truck Plaza located at 15600 South Harlan Road, Lathrop, County of San Joaquin, <br /> California, on May 21, 2003 <br /> 1 On May 21, 2003, ten groundwater monitoring wells were purged and sampled on the <br /> 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 EDS), and Oxygenates including Ethanol and <br /> Methanol <br /> 1 <br /> Six ofthe ten groundwater monitoring wells on the subject property detected Methyl-t- <br /> butyl-ether(MTBE) The highest detection of MTBE encountered is 780 parts per biIIion <br /> (ppb)found in deep groundwater monitoring well MWO-1 X located approximately 10 <br /> feet northeast of the current tank farm Monitoring well MW-2 had a decrease from <br /> 1 previous levels, having levels of 250 ppb MTBE MTBE was detected for the fourth <br /> time in offsite monitoring well MWO-2 at a concentration of 32 ppb Based upon <br /> groundwater measurements taken at the subject property on May 21, 2003, the <br /> groundwater gradient is to 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 /> 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 /> 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 /> 1 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 /> with hand held PVC disposable bailers Sample containers were labeled and chilled <br /> 1 . Avalon Environmental Consultants Project# 9627-001-15 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> May 23, 2003 1 Lathrop, California <br />/ <br />