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REPORT OF FINDINGS FROM THE MW#1 aka UST-1 <br /> First Half Sampling Event Sampled 6/09103 <br /> Water Sampling and Analysis <br /> Water samples from MW#1 were extracted by Del-Tech Geotechnical Support Services on 06109103. <br /> The samples were transported under chain of custody to Sherwood Labs.Pump purge rates were one <br /> G.P.M. Depth to the water surface was 50.21' with a+/-4'stickup on the casing. The water table at <br /> the time of sampling was about 46' below the surface. TPHd and BTEX were analyzed by EPA <br /> Methods M8100 and SW8020 by Sherwood Labs in house. <br /> Findings from Sample Analysis <br /> Analysis by all of the above methods resulted in non-detect status for each of the analytes. <br /> Conclusions from this Groundwater Sample Analysis <br /> The laboratory results from this sample period are non-detect as were the results of the first two sets <br /> ofwater samples extracted from this monitoring well.The analysis ofthe groundwater samples from <br /> the 3/01/2002 were rejected due to the fear of contaminated samples in the laboratory. The <br /> groundwater elevation has lowered about two feet. From samples taken for the RWQCB it was <br /> determined that the surface water in MW#1 contains +/- 25 ug/L on Nitrate (NO3). Nitrate is an <br /> electron acceptor for the bio-reaction of hydrocarbons. If any hydrocarbons were present in the <br /> groundwater, they would soon be remediated by a very active bio-rdaction due to the presence of <br /> a nitrate electron acceptor. <br /> Four out of a total of five groundwater samples have been analyzed as non-detect for all analytes. <br /> The author feels it is safe to conclude that the spill from the UST did not reach the groundwater or <br /> if it did, it was remediated. <br /> Recommendations and General Conditions <br /> San Joaquin County Environmental Health Department issued a letter on June 9, 2003 directing <br /> more sampling events and a mass volume calculation for contaminated soil. It is the opinion of this <br /> author that any additional money spent on this particular investigation would be wasteful, and <br /> should be better spent on moving on toward the goal of making this property a productive element <br /> of the community. <br /> Please contact Ervin Rifenburg of this office(2091368-9381)if any questions arise concerning this <br /> Work Plan, <br /> 1.10fEssro�r <br /> Respectfully sub 'tted, ;° �,iv%F �q <br /> Fo g <br /> ac <br /> t4o. 1976 a <br /> Ervin fenb g, <br /> Enclosures: UFC <br /> 1. Site Map w/Monitoring Well Loc a ion <br /> 2. Soil and Water Analysis Recap with Graph <br /> 3. Del-Tech water sample report <br /> 4. Laboratory analysis of groundwater samples <br /> cc: Woodbridge Partners Inc. <br /> 2 <br />