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Mi •� Mr Harlin Knoll August 25, 1998 Page 2 i hydrocarbons were present below 35 feet, while sidewall samples indicated that the lateral limits of soil contamination had been removed Historical soil analytical results are summarized in Attachment A The excavated soil was stockpiled and aerated onsite under the authorization of the San Joaquin County Unified Air Pollution Control District (APCD) Aerated soils were confirmed clean using laboratory analyses and backfilled into the excavation after approval by San Joaquin County Public Health Services Environmental Health Division(PHS/EHD) FIELD ACTIVITIES Drilling using Direct Push Drill Rig On June 29, 1998, Jeanne Buckthal supervised the advancement of soil boring DB-1 to a depth of 54 feet below ground surface(bgs)by Fisch Environmental using a direct push drill ng Soil samples were collected in clear acetate sleeves at depths of 9, 20, 30, 34, 39, and 44 feet bgs The soil at the ends of the acetate sleeves was placed m a sealed plastic bag and the sod vapor was analyzed in the field using a flame ionization detector (FID) to evaluate the presence of volatile organic constituents The location of boring DB-1 is shown on Figure 2 Field notes are included in Attachment B An attempt to collect a soil sample from a depth of 54 feet bgs was unsuccessful because silt and groundwater at depth became lodged between the inner and outer drill rods Consequently, the inner . rods broke, the sample was not recovered, and drilling was terminated at a depth of 54 feet bgs Subsequent to drilling, the boring was backfilled to ground surface with neat cement No dnll cuttings were generated using the direct push technology A groundwater sample was not collected Drilling using Hollow Stem Auger Drill Ria On July 14 and 15, 1998, Jeanne Buckthal supervised the advancement of sod bonngs DB-1a through DB-3 by Woodward Drilling Co using a hollow stem auger drill ng Boring DB-Ia was advanced to a total depth of 99 feet bgs and was located within 3 feet of DB-1 Soil samples were collected from DB-la at 5-foot intervals beginning at 50 feet bgs Borings DB-2 and DB-3 were advanced to depths of 71 feet bgs, and soil samples were collected at 10-foot intervals to a depth of 30 feet and at 5-foot intervals from 35 to 70 feet bgs Soil samples were collected in brass liners Boring locations are shown on Figure 2 Field notes are included in Attachment B Soil collected at each sample location was placed in a sealed plastic bag The soil vapor was then analyzed in the field using a FID to evaluate the presence of volatile organic constituents in the soil Soil cuttings were separated as "clean" and "contaminated" The "clean" soil included cuttings from the surface to a depth of approximately 30 feet and were stockpiled on and covered with plastic sheeting Soil with field evidence of contanunation (odors, FID readings) were contained in 5-wall corrugated cardboard containers with 10-nul poly liners designed for storage of hazardous waste Groundwater was encountered beneath the site at approximately 39 5 to 43 feet bgs One attempt at collecting a water sample using a hydropunch was made in DB-la, but no water was recovered Thereafter, water samples were collected from each boring through the hollow stem augers using a new, disposable bailer know1c&hsmVepats\invrpL&c