ARCHIVED REPORTS_XR0011673 - Laserfiche WebLink

Home Browse Search

GEOMATRIX 2.2 Facility History ' The facility has been used for many years for formulating and storing agricultural fertilizers. Previous operations also included pesticide formulation in the Ag Chem area near the west side of the facility. The Ag Chem area is approximately 390 by 550 feet and includes large warehouse ' buildings, an office building, and a tank farm. The area is entirely paved and drains via underground piping to a main collection si mp. The buildings and tanks are currently used to ' warehouse packaged and bulk (liquid and solid) agricultural products. ' The facility history includes remediation of groundwater below most of the Simplot-owned properties. Groundwater remediation has been conducted from about 1982 through the present to remove pesticide residues in the upper aquifer (TreaTek, 1992), as summarized below in Section 2.5. ' 23 Tank History In the early 1970s, OXY installed a new Ag Chem area for dry and liquid pesticide formulation activities. The area was completely paved and fenced. Surface runoff drained via subsurface piping to the main collection sump, which pumped stormwater into aboveground tank 127. Formulation activities were conducted inside buildings; the building floors contained floor drains and two collection sumps. Rinsewater that collected in these drains was pumped via aboveground piping to the main collection sump. Water collected in the sump, which was not predominantly stormwater, was pumped into aboveground tank 128. 1 In 1981, the Department of Health Services (IHS, the DTSC predecessor agency) issued OXY Interim Status Document (ISD) CA009184508 (DHS, 1981) to regulate the storage of hazardous wastes. ' In 1982, OXY submitted a Hazardous Waste Storage Facility permit application to the U. S. Environmental Protection Agency(EPA)(OXY, 1982). The types and estimates of annual quanti- tiesof wastes stored under interim status operation are presented in Table 1. In addition to wastes included on this list, a 1987 waste profile for wastewater transported from the tanks to a hazardous waste disposal facility in Texas indicated the additional presence of nitrogen peroxide ' (P079). In 1983, Simplot purchased the Lathrop facility from OXY and submitted a request to DHS to rescind the ISD (Simplot, 1983). Simplot indicated that hazardous wastes were not treated or disposed of on the Lathrop facility and that hazardous waste would no longer be stored more than 90 days. The ISD was rescinded (DHS, 1983). Tanks 127 and 128 continued in use for short-term (less than 90 days) storage of agricultural chemical wastewater. 3 1