SITE INFORMATION AND CORRESPONDENCE

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Regional Board Staff Recommendations 10 August 1990 Preliminary Site Investigation Soil samples are to be analyzed for the appropriate Minimum Verification Analyses specified in Table #2 . CASE B Water Present in the Tank Pit - Soil and Water Samples Required If water is present in the tank pit, both soil AND water samples are required. The soil samples are to be taken by the methods outlined in Case A above, from the wall of the tank pit at the soil/ground water interface at the tank ends . Water samples are to be taken as follows : Prior to sampling the water from the tank pit for analysis , a visual observation is to be made for evidence of floating product . All observations are to be recorded. The tank pit may be purged and allowed to refill before sampling . (The purged water may be stored in drums for disposal or discharged to the sanitary sewer if permission is granted. HOWEVER, IT IS NOT TO BE DISCHARGED TO A STORY DRAIN WITHOUT PRIOR PERMISSION OF THE REGIONAL BOARD. ) Water samples are to be taken which are representative of water in the tank pit . Generally, one water sample is adequate; however, more may be necessary to adequately characterize the water in the-tank pit. Samples may be taken manually at the edge of the tank pit, both surface and about 12 to 18 inches below the water surface . However, the sample is to be taken with a device designed to reduce the loss of volatile components . A bailer with a sampling port is a suitable sampling device . The water is to be transferred into a volatile organic analysis (vOA) vial with as little agitation as possible . A teflon (Registered trademark) septum is to be used to seal the vial . [ADDS TO LUFT] Soil and water samples are to ;be analyzed for the appropriate Minimum Verification Analyses specified in Table #2 . 14