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NATIONAL Santa Rosa Division <br /> 435 Tesconi Circle <br /> • C6133 ,ENVIRONMENTAL Santa Rosa CA 95401 <br /> o TESTING INC. Tel (707) 526-7200 <br /> Fax (707)526-9623 3 <br /> March 1, 1995 <br /> Dear Pro3ect Manager <br /> INET has recently noted persistent lour level positive occurrences of toluene <br /> and xylenes in lamoratory supplied trip blanks and rinse water Since the <br /> levels of these compounds are occurring below 2 PPB, and there is a lack of <br /> any gasoline type pattern present, we are very confident of their presence <br /> neing due to laboratory ccrtaminatron It appears that the water we used <br /> became contaminated from an %--nident,fied source <br /> we believe this same source may be affecting samples we have noted the <br /> presence of toluene and xylene at or below the reporting limits in our <br /> method blanks, which are from a different water sources This low level <br /> response may be contributing ;.o positive results in actual samples <br /> NTET is taking steps to correct this problem and nope to eliminate it by the <br /> Sth of March vqe will veep Y–" _—'J.L-med if the nroolem continues beyond <br /> this date <br /> Thank you for patience <br /> Respectfully, <br /> National Environmental Testi-:c <br /> Thomas F Cullen, Jr <br /> Division Manager <br /> i <br /> .o <br /> cRo�r <br />