ARCHIVED REPORTS XR0004102 - Laserfiche WebLink

Home Browse Search

aTEM X B SITE CLOSURE EVALi3ATI9N REPORT Beacon Station No.696 2448 West Kettleman Lane Lodi,California ' Delta Project No.D093-916 Page 4 to Mr.Frank Beeler at the City of Lodi Public Works Department on November 20, 1996,by Delta personnel inquired ' as to the City's plans to drill and complete future water supply wells. Mr. Beeler stated that no wells are planned through the year 2005 and if wells were to be added,they would be in the newly developing areas of the City or north ' towards the Mokelumne River. 13.0 SUMMARY OF]TWEESIMATION RESULTS 3.1 Distribution of Petroleum_Hydrocarbons in Soil ' A summary of available analytical results for soil samples collected from soil borings is presented in Table 2, and a summary of analytical results for soil samples collected during tank and product line replacements is presented in Table 3. Locations of the soil borings are shown in Figure 2, and tank pit and product line sampling locations are shown in Figure 5. Analytical results reported that the highest concentrations of petroleum hydrocarbons in soil were detected in a sample collected from the northeast comer of the former tank pit location (Sample SS-1) in March 1989. The initial analysis of this sample reported benzene at a concentration of 150 milligrams per kilogram (mg/kg) and total ' petroleum hydrocarbons(TPH)as gasoline at a concentration of 23,000 mg/kg. The approximate lateral and vertical extent of petroleum hydrocarbons in soil as of May 1987 is illustrated in Figures 6, 7, and 8. The approximate lateral and vertical extent of petroleum hydrocarbons currently remaining in soil as ' assessed by soil borings drilled by Delta in August and September 1994 is shown in Figures 9 and 10. ' 3.2 Distribution of PcImleum Hydrocarbons in Ground Water A summary of available analytical results for ground water samples is presented in Table 4. The highest ' concentrations of petroleum hydrocarbons were detected in a ground water sample collected from monitoring well MW-19 on November 23, 1987. This sample reported benzene at a concentration of 7,900,000 micrograms per liter ' (pg/L.) and TPH as gasoline at a concentration of 30,000,000 gg/L. Liquid-phase petroleum hydrocarbons were reportedly present in some monitoring wells from 1987 to 1989, but records of product thickness are not available. RPTo01.916 1