WORK PLANS - Laserfiche WebLink

Home Browse Search

' SITE INVESTIGATION WORK PLAN ' Former Helena Chemical Facility 2245 West Charter Way Stockton, California 1 1.0 INTRODUCTION ' This work plan was prepared by Condor Earth Technologies, Inc. (Condor) to describe proposed Site investigation activities at the former location of Helena Chemical at 2245 West Charter Way,730 E. Channel Street (Site) in Stockton, California (Figures 1 and 2, Appendix A). The purpose of the work is ' to fill data gaps and improve the accuracy of interpretation for the lateral and vertical extents of fertilizer contamination related to aboveground storage tanks (ASTs) formerly located at the Site. The proposed work will include drilling and sampling soil and groundwater at 14 locations for laboratory analysis, then ' installing three groundwater monitoring wells, and collecting groundwater samples for laboratory analyses. Condor prepared this work plan at the request of Ms. Beverly Garcia of Raymond Investment Corporation (property owner) and as directed by Ms. Pamela Creedon of the Central Valley Regional ' Water Quality Control Board(CVRWQCB)in the letter dated 1 April,2014. All work conducted by Condor will be under the supervision of a California Certified Engineering ' Geologist. This work plan includes project background information, a description of the field, laboratory, and reporting procedures proposed to conduct the work, and a project schedule. 2.0 PROJECT BACKGROUND Condor Earth Technologies, Inc. (Condor) is pleased to present this work plan for an investigation and assessment to determine if potential pollutants associated with historic site activities, including agricultural chemicals, petroleum hydrocarbons, and metals which may be present in the soil and groundwater at the Site. The CVRWQCB evaluated the findings from a Phase I Environmental Site Assessment (ESA). The ESA indicated that the Site has been occupied by various tenants for commercial; and light industrial uses, including a beverage distribution facility, agricultural supplies (chemicals, fertilizers, and pesticides) ' storage and distribution facility, tractor repair facility, battery sales/recycling facility, and various contractor storage facilities. Liquid Fertilizers were reported to have been stored in three above ground storage tanks (ASTs), formerly located in the northwest corner of the Site. ' San Joaquin County Environmental Health Department (SJCEHD) file records documented several incidents of improper storage and handling of hazardous chemicals, spills, and the presence of stained soil at the Site. Site investigations conducted in 2001 and 2002 found elevated levels of Total Kjeldahl ' Nitrogen (TKN), ammonia, and nitrate in soil samples. A Phase H ESA conducted in 2013 also showed that soil and groundwater contained TKN, ammonia, and nitrate. SJCEHD subsequently placed the Site on their local "Contaminated Site List' and referred the case to the CVRWQCB for further review and evaluation. The CVRWQCB evaluated the data and found that the Phase I ESA cited analytical results for soil ' samples collected from a former hazardous materials storage area, without specifying the location of the former hazardous material storage area. The soil sample analytical results indicated that the samples contained TKN concentrations as high as 7,700 milligrams per kilogram (mg/kg), and ammonia ' concentrations as high as 2,200 mg/kg. Soil samples were collected from the former ASTs locations over at least two sampling events. Those samples contained TKN up to 5,200 mg/kg; nitrate up to 2,740 n W CONDOR