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10 EXECUTIVE SUMMARY <br /> Avalon Environmental Consultants (Avalon) conducted a Second Quarter Groundwater <br /> Monitoring at the request of Mr Kashmar Singh and Mr Dalwlnder Dhoot, owners of <br /> Joes Truck Plaza The assessment was performed at the Joes Truck Plaza located at <br /> 15600 South Harlan Road, Lathrop, County of San Joaquin, California, On April 28, <br /> 2000 <br /> On April 28, 2000, six groundwater monitoring wells were purged and sampled on the <br /> 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 2,800 ppb found <br /> in groundwater monitoring well MW-1 located in the former tank farm excavation <br /> The second highest detection was in MW-2, located northeast of the former tank pit on <br /> the northern boundary of the subject property The level of MTBE found in MW-2 was <br /> 290 ppb Based upon groundwater measurement taken at the subject property on <br /> April 28, 2000 the groundwater gradient Is to the east with a northern component <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 /> 1 approximately 7 gallons were discharged from each well All purged groundwater was <br /> collected in 55-gallon, Department of Transportation (DOT) approved plastic drums, <br /> sealed and temporarily stored on-sate 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 both 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 /> on ice immediately after collection Groundwater samples were analyzed for Total <br /> MLAvalon Environmental Consultants Project#9627-001-3 <br /> Joes Truck Plaza 15600 South Harlan Road <br /> May 20, 2000 1 Lathrop, California <br /> 1 <br />