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I Kennedy/Jenks/Chi Ian Attachment A to Kennedy/Jenks/Chilton's letter to Mr. Charles Whitworth dated 14 July 1989 Page 1 SURFACE SAMPLE COLLECTION Thirteen discrete surface samples were collected throughout the yard (see Figure 4) Surface samples were collected using a shovel and hand trowel To collect surface samples, a small area approximately one foot square by six inches deep was excavated. The surface soils were extremely hard and required lj a shovel to break through the surface and expose enough soil to collect samples. After the soil was broken up, a hand trowel was used to pack the . � soils into pre-cleaned brass liners. Two brass liners were collected at each j sample location due to the amount of soil required to perform the extensive suite of pesticide analyses proposed for these samples. After each sample liner was filled to capacity, a Teflon sheet and a tight fitting plastic cap was emplaced over each end. The caps were secured to the brass liners using electrical tape Each liner was labeled to include site name, location number, date, initials of collector, time, and additional E, pertinent information. After collection, sealing, and labeling was completed, the brass liners were placed in a cooled ice chest for preservation purposes. A chain-of-custody form was filled out concurrently with collection of the samples and included in the ice chests for transport to the laboratory The samples were shipped the next day to the Kennedy/Jenks/Chilton Laboratory Division located in San Francisco, California for analysis. WIPE SAMPLE COLLECTION Two areas on the floor of the warehouse building were selected for wipe sample collection Due to the extensive number of analyses proposed for these samples, a total of 12 filter papers had to be collected at each location, as each analysis required two separate filter papers. Wipe samples were s collected on Whatman filter papers using hexane as the wetting agent A template was place on the area to be wiped, which represented approximately 100 cm2. Two filter papers were saturated with hexane and the area outlined by the template was wiped thoroughly with the two filter papers. The floor area was not precleaned of any stains or dirt that were present. After the area was wiped with the two filter papers, the papers were immediately put into a clean glass ,lar, sealed with a Teflon lined tight fitting cap, and labeled. The template was then moved over approximately six inches to another uncleaned area of the floor The wipe procedure was repeated until six separate areas (two filter papers each) had been wiped for a single sample on the floor. • Field wipe blanks were collected by wetting 10 filter papers with hexane from s the same bottle used to wet the filter papers for the wipe samples. The blank filter papers were immediately put into a glass container, sealed with a 1 I � I