SITE INFORMATION AND CORRESPONDENCE

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Q,7/22/2002 16:10 2094 AGE STOCKTON Ift PAGE 06 07 May 2002 AGE-NC Project No. 98-0466 Page 14 of 16 • Samples will be logged on a chain-of-custody that will accompany the samples from the field to the receiving laboratory. Each change of custody will be documented. • The laboratory report will note the condition of the samples upon receipt on the chain-of- custody form, a copy of which will be included in the final report. • All samples selected for analysis will be analyzed within standard holding times. • Samples will be analyzed according to EPA methods noted in Section 7.0 of this work plan. • Sample duplicates will be collected and analyzed as appropriate to ensure data validity. One laboratory-prepared travel blank will be utilized to detect cross-contamination of the VOC sample, and an equipment blank will be prepared in the field to check, if necessary, for cross- contamination resulting from inadequate decontamination procedures. • The site-specific health and safety plan will be reviewed in the field prior to initiation of field work. • Field work will be conducted under the supervision of a California Registered Geologist experienced with environmental investigations. 7.0. EQUIPMENT DECONTAMINATION All sampling tools used for sample collectionwill be thoroughly rinsed with clean water after being washed with a solution of Alconox.All down-hole drilling and sampling equipment will be pressure washed prior to starting the boring. 8.0. LABORATORY ANALYSES Ground water samples will be collected from each boring using a new, clean, disposable plastic bailer. Immediately upon retrieval, the samples will be transferred into appropriate EPA-approved containers as follows: • 500-milliliter plastic lacking a preservative - dissolved lead, nickel, copper, chromium and zinc, formaldehyde and arsenic, and • Three 40-m1 VOA vials containing 0.5 ml 18%hydrochloric acid as a sample preservative- total recoverable petroleum hydrocarbons (TRPH)- Soil samples will be collected as described in Section 4.3. Samples will be logged on a chain-of custody farm stored in a chilled container and transported under chain-of-custody to DHS-certified laboratory- Adv.c•d Ge•Favtr•um•nn],Ia•.