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Q <br /> A S S O C I A T E S I N C <br /> Monitoring well MW1 was purged a minimum of three well volumes and until the stabilization <br /> of electric conductivity, pH, and temperature was observed Subsequent to purging, groundwater <br /> was sampled and transferred to appropriate sample containers, using a clean, disposable bailer <br /> with a bottom-emptying device to reduce volatilization Sample containers were then labeled <br /> with sample identification, placed on ice, and shipped under chain-of-custody to Sequoia <br /> Analytical Field development/purge logs are presented in Attachment 1 <br /> Laboratory Analysis <br /> The groundwater sample from well MW1 was analyzed by Sequoia Analytical for total <br /> petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) by EPA Method 801518020, and oxygenates fuel additives by EPA method 8260 <br /> Laboratory Results <br /> Only methyl tert-butyl ether (MTBE) was detected above the laboratory method detection limits <br /> The reported MTBE concentration is 3 57 parts per billion (ppb) No other constituents were <br /> detected <br /> Analytical results are summarized in Table 2 Laboratory data sheets and chain-of-custody <br /> documentation are provided in Attachment 2 <br /> If you have any questions, please contact our office at(209) 579-2221 <br /> Respectfully Submitted, <br /> ATC Associates Inc <br /> Tom J Lutterman, REA <br /> Project Manager � JWNE <br /> HOMSEY <br /> Na. C(A410 <br /> Jeanne Homsey, P E EAP IZ d <br /> CA Registered Civil Engineer No C 47410CIVIL <br /> Attachments z 'EA�Z <br /> cc Mr Butch Schmidt, Stockton Unified School District <br /> Mr Marty Hartzell, RWQCB <br /> W 117292 0001\reports\I qmr 2000 doe 2 <br />