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y NATIONAL Santa Rosa Division <br /> 435 Tesconi Circle <br /> ENVIRONMENTAL Santa Rosa, CA 95401 <br /> ® TESTING, INC. Fax `t°o;r 526-7200 <br /> March 1, 1995 <br /> Dear Project Manager <br /> NET has recently noted persistent low level positive occurrences of toluene <br /> and xylenes in iaDoratory 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 /> being due to laboratory contamination it appears that the water we used <br /> became contaminated from an unidentified 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 to positive results in actual samples <br /> NET is taking steps to correct this problem and hope to eliminate it by the <br /> 8th of March we will keep you znformea if the problem continues beyond <br /> this date <br /> Thank you for patience <br /> Respectfully, <br /> National Environmental Testing <br /> Thomas F Cullen, Jr <br /> Division Manager <br /> �xO <br /> cRo�r <br />