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W (11 <br />Summary of Gauging and Sampling Activities <br />. April 2005 through June 2005 <br />Circle K Store 01205 <br />16470 Cambridge Street <br />Lathrop, CA <br />Project Coordinator: Edward Ralston Water Sampling Contractor: TRC <br />Telephone: 916=558-7633 Compiled by: Daniel Lee <br />Date(s) of Gauging/Sampling Event: 04/27/05 <br />Sample Points <br />Groundwater wells: 7 onsite, 12 offsite Wells gauged: 19 Wells sampled: 19 <br />Purging method: Diaphragm pump <br />Purge water disposal: Onyx/Rodeo Unit 100 <br />Other Sample Points: 0 Type: n/a <br />Liquid Phase Hydrocarbons LPH <br />Wells with LPH: 0 Maximum thickness (feet): n/a <br />LPH removal frequency: n/a Method: n/a <br />Treatment or disposal of water/LPH: n/a <br />Hvdrogeologic Parameters <br />Depth to groundwater (below TOC): Minimum: 9.65 feet Maximum: 13.85 feet <br />Average groundwater elevation (relative to available local datum): 4.07 feet <br />MAverage change in groundwater elevation since previous event: 1.93 feet <br />Interpreted groundwater gradient and flow direction: <br />Current event: 0.001 ft/ft, northeast <br />Previous event: 0.002 ft/ft, northeast (01/10/05) <br />Selected Laboratory Results <br />Wells with detected Benzene: 5 Wells above MCL (1.0 lag/1): 5 <br />Maximum reported benzene concentration: 860 pg/I (MW -2) <br />Wells with TPPH 8260B 11 Maximum: 8,300 pg/I (MW -9) <br />Wells with MTBE 6 Maximum: 500 pg/I (MW -16) <br />Notes: <br />This report presents the results of groundwater monitoring and sampling activities performed by TRC. Please contact the <br />primary consultant for other specific information on this site. <br />