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% MEMORANDUM % 3443 Routier Road, Suite A Phone: (916) 361-5600 Sacramento, CA 95827-3098 ATSS Phone: 8-495-5600 TO: Rudy Schnagl, Chief Ag Regulatory Unit DATE: 26 February 1992 FROM: Wendy Wyels Assoc Land & Water Use Analyst SIGNATURE: SUBJECT: BREA AGRICULTURAL SERVICE, STOCKTON Kleinfelder has submitted a 6 January 1992 "Soil Excavation Report" for the work completed to date at Brea Ag Service in Stockton. The report is fairly complex, and covers several distinct operations at the site. We have received and approved two earlier reports dealing with related activities at Brea Ag. Because of the many related projects over a short time span, I prepared a summary of all the environmental activities that have occurred at this site, as shown below. The latest report covers activities #5, 6, and 7. Summary of activities 1. November 1990. Excavated the oil/water separator and 10-15 cubic yards of soil in the vicinity of the separator. Kleinfelder collected a composite sample from the excavated material. DDT products were found at 31 mg/kg and TPH at 5900 mg/kg. The stockpiled soil was taken to Kettleman in September 1991. 2. December 1990. Kleinfelder collected soil samples at various depths (to 18') from a test pit near the former separator. Among the chemicals found were TPH, 1,2-D, DBCP, DBCP, EDB. 3. April 1991. Kleinfelder drilled three borings (to 511) next to each of the three dry wells. While several chemicals were detected, the only analysis exceeding hazardous or designated levels was in boring B-3 at 6' depth, in which 2 ppm DDT products was found. 4. July 1991. Kleinfelder drilled two deep (81-911) borings between the three dry wells. Soil samples were collected at intervals, and a BAT probe was used to collect groundwater samples. Soil concentrations of 1,2-DCP and nitrate decreased with depth. The groundwater contained 8.8 to 27 ppb 1,2-DCP and 12.8 to 20.7 ppm NO3-N. The facility domestic well was also sampled, and had 0.6 ppm NO3-N. It was concluded that groundwater has been impacted by activities at the site. 5. September 1991. Kleinfelder excavated boring B-3 to a depth of 12'. The soil, plus the soil from the November 1990 excavation, was loaded on trucks for transport and disposal at Kettleman. Confirmation sampling of the sidewalls and floor of the excavation showed that all remaining DDT was below hazardous levels. The excavation was backfilled. 6. September 1991. Kleinfelder excavated four test pits around the area of the former oil/water separator. Excavated soil was stockpiled on site. Soil samples were collected from the pits at depths of 10-141, and were analyzed for TPH. TPH was not detected in test pits 1 and 3, and was only found at low levels in test