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1 <br /> . 1.0 EXECUTIVE SUMMARY <br /> 1 Avalon Environmental Consultants (Avalon) conducted a Fourth Quarter Groundwater <br /> Monitoring at the request of Mr Kashmar Singh and Mr Dalwinder Dhoot, owners of <br /> Joes Truck Plaza The assessment was performed at the Joe's Truck Plaza located at <br /> 15600 South Harlan Road, Lathrop, County of San Joaquin, California, on December <br /> 1 27, 2000 <br /> On December 27, 2000, six groundwater monitoring wells were purged and sampled <br /> on the subject property Groundwater samples were analyzed for Total Petroleum <br /> Hydrocarbons as diesel (TPHd), Total Petroleum Hydrocarbons as gasoline (TPHg), <br /> Benzene, Toluene, Ethyl benzene and Xylene (BTEX), Lead scavengers (1,2-DCA and <br /> EDB), and Oxygenates including Ethanol and Methanol <br /> Four of the six groundwater monitoring wells on the subject property detected Methyl- <br /> t-butyl-ether (MTBE) The highest detection of MTBE encountered is 720 parts per <br /> billion (ppb) found in groundwater monitoring well MW-2, located northeast of the <br /> former tank farm excavation The second highest detection was in MW-1, located <br /> within the former tank pit excavation The level of MTBE found in MW-1 was 150 <br /> ppb Based upon groundwater measurement taken at the subject property on <br /> December 27, 2000, the groundwater gradient is to 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 /> i 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 /> i 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 /> i on ice immediately after collection Groundwater samples were analyzed for Total <br /> Aft Avalon Environmental Consultants Project#9627-001-5 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> January 29, 2001 1 Lathrop, California <br />