ARCHIVED REPORTS XR0012752 - Laserfiche WebLink

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Figure 3 presents a typical well construction detail. Following well completion, the elevations of the vault boxes and tops of casing of all of the monitoring wells will be surveyed by a licensed surveyor to mean sea level datum. All drill cuttings will be stockpiled on-site and covered with Plastic. Soil samples will be collected from the stockpile and composited for laboratory analysis for total petroleum hydrocarbons, calculated as gasoline, diesel, oil, transmission. fluid, and BTEX compounds. The results of the analysis will be reviewed to determine the appropriate disposition of the stockpiled soils. 5 k jrzroundwater Sam li o a All three monitoring wells will be sampled by PACIFIC. The sampling procedure consists of first measuring the water level in each well with an electronic water-level indicator, and f checking for the presence of separate phase petroleum product. i Absence of separate'phase product will be checked using a clear Teflon bailer. If separate phase product is observed in a monitoring well, the well will not be sampled for laboratory analysis. rwells that do not contain separate phase product will be purged s a minimum of four casing volumes of water (or to dryness) using centrifugal purging, temperature, H and electrical willbe stable, in order to document that a representative sample is obtained. These measurements, as well as turbidity observations, will be recorded on field data sheets. After water levels partially 1[ recover, a sample will be collected using a Teflon bailer and will be placed into appropriate EPA-approved containers. The } samples will be labeled, logged onto chain-of-custody documents, and transported on ice to a California State-certified K laboratory. A1-1,.purge ,water will be contained .in storage drums .on:site. Results of the water analysis will be used to determine s appropriate disposal of the purge water. "s z v i i