Laserfiche WebLink
n � i <br /> analysis of TPHD . Analysis of total recoverable <br /> petroleum hydrocarbons by method 418. 1 was noted by Ms. . <br /> Reuss during the conversation because of a typographical <br /> error in the workplan which indicated method 413 . 1 <br /> rather than 418 . 1, implying that. 418 . 1 was the <br /> appropriate method. <br /> 3. ) With regard to permissible' holding times for samples <br /> analyzed by methods 418. 1 and 8020/8015, appropriate <br /> procedures were observed by Sequoia Analytical ( DHS <br /> certification No. 1210 ) pursuant to EPA SW-846 and <br /> approved 'DHS protocol . Excerpts from SW=846 are <br /> enclosed for your reference; which indicate allowable <br /> holding times of 28 days and,; 14 days for methods 418. 1 <br /> and 8020/8015, respectively. <br /> As stated in the November 20, 1990 report, we do not believe <br /> additional investigation is necessary at this site. The proposed <br /> method of treatment and disposal of :;the excavated material is <br /> aeration to non-detectable levels and reuse of the material to <br /> backfill the excavation. The property owners have retained the <br /> responsibility of acquiring appropriate permits for soil <br /> aeration. WaterWork will collect confirmation samples at the <br /> request of the property owner. <br /> If you have any questions or wish to discuss this matter further, <br /> please contactme at your convenience. <br /> Respectfully, <br /> WaterWork <br /> �. Lan� <br /> Nora H. Kataoka <br /> CA Registered Civil Engineer <br /> No. 38322 <br /> NHK/tdp <br /> pc: Mr. •Charles Skobrak <br /> Mr. Jim Maughn. <br /> ip <br />