ARCHIVED REPORTS_XR0012756 (2) - Laserfiche WebLink

Home Browse Search

- r. t " Tri-Valley Growers , �� March 24, 1988 Project No. 1582G Page 6 contamination migration is sur ised to be slow. However, the changing apparent ground-l•,ater flow rection makes it difficult to determine the prevailing local ground-water low direction. To date, only MW-4 has shoe n hydrocarbon contamination in the ground-water. The concentrations of benzen of 630 ppb and toluene of 120 ppb detected in the water exceed the state ac 'on levels. These levels are presently 0.7 ppb for 3 benzene and 100 ppb for tolue e. While no state action levels exist for TVH and TEH, the values observed ar evate nd indicate that the ground-water has been impacted. The concentrate xylenes of 440 ppb in the wafer is below the state action level of 620 ppb. The amount of load detected in the MW-4 water vample (6.0 ppb) is below the drinking water standard of 30 ppb. It should be noted that an old gasoline pi:rnp exists on the private property � directly north of the Tri Valley facility and could possibly be a contributing source of ground-water contamination. The domestic water well on this kms, property was not currently observed to display drinking water quality degradation. Well construction detatils are not known, and the water-bearing zone is unknown. CONCLUSIONSAND R,Er2dMENDATIONS 1 } The analytical results from the excavation sail piles show that TEH, TVH, �» and BTX are Below Detection Limits of the laboratory. Total lead concentration from the soil piles are below the DHS Hazardous Waste Threshold Limit of 1,000 ppm for total lead in soil (Marshack, 1986). The laboratory results indicate that the soil piles may be used to fill in the excavation pits. 2) Analytical results from the water well adjacent to Tri-Valley Growers shows that concentrations of TEH, TVH, BTX, and total lead are not present at the laboratory detection limit.