ARCHIVED REPORTS XR0000672 - Laserfiche WebLink

Home Browse Search

Accredited by US Dept of Commerce ASBESTOS TEM LABORATORIES, INC CA DOHS FLAP Jun/25/2002 Ms Maria Venegas McCampbell Analytical 110-2nd Ave,#D7 Pacheco,CA 94553 RE LABORATORY JOB# 299-171 Transmission electron microscopy analytical results for I water sample(s) Job Site Flag City Chevron Job No 0206240 Enclosed please find results for the TEM analysis of one or more water samples The analytical procedures were performed according to EPA Method 600/4.83 for the analysis of asbestos in drinking water Prior to analysis,samples are checked for damage,disruption of any chain-of-custody seals, and completeness of accompanying paperwork If no problems are found,samples are then logged-En,each given a unique laboratory number,and a hard copy containing all pertinent information is generated This,and all other relevant paper work are kept with each sample throughout the analytical procedures to assure proper analysis • Preparation of water samples is performed within a NEPA filtered, Gass 100 air,laminar flow clean bench environment Prior to filtration,water sample containers are ultrasonicated, and the exterior surfaces cleaned An aliquot of water is drawn from the sample container and drawn through a special filtration apparatus and collected onto a 0 1 micron pore size polycarbonate filter The filters are removed from the apparatus and dried A portion of each sample filter is sectioned,placed onto a glass microscope slide, and carbon coated The filters are further sectioned and placed carbon side up onto 200-mesh copper TEM sample grids in a chloroform wick washer Sample grads are placed into a condensation washer,or left in the wick washer,until all filter material is dissolved The TEM grids are removed and placed into labeled grid storage boxes TEM analysis is performed on a Philips EM-300 transmission electron microscope operating at 100 kV Initially, the gnd is scanned at Iow and medium magnification to insure proper sample loading,and coherence of the carbon support film Then TEM grid openings are analyzed at a magnification of 10,000X All fibers X10 um in length and exhibiting an aspect ratio>3 1 are analyzed Scanning continues until either 100 asbestiform fibers>lOum in length are counted,or an analytical sensitivity of 0 2 million fibers per liter(MFL)is achieved Analyzed fibers are subjected to detailed morphological and selected area diffraction(SAED)analysis Fibers indicated as asbestos,or potentially asbestos,are further analyzed by energy dispersive X-ray(EDX)analysis as needed The number of asbestos fibers detected,and other analytical parameters,are then used to calculate the concentration of asbestos in MFL The results are entered into a standard report format and reviewed by the analyst and the laboratory manager before release to the client Sincerely Yours, rE _ a ager T M LABORATORIES,INC ---These results relate only to the samples tested and must not be reproduced, except in full, with the approval of the laboratory This report must not be used to claim product endorsement by NVLAP or any other agency of the U S Government --- 1409 FIF rH STREET,SUITE C • BERKELEY,CA 94710 • (510)528-0108 FAX(510)528-0109 With f)flirn¢in RPnn NV(775) 359-3377 and lnr Vponc NV(702)270-2463