COMPLIANCE INFO_2019 - Laserfiche WebLink

Home Browse Search

EnviroTech Consultants, Inc. Page 22 Site Investigation: Sampling Report Louise Avenue Water Treatment Facility 7.0 EQUIPMENT DECONTAMINATION AND RINSATE DISPOSAL EnviroTech's standard practice for cleaning the tools between samples, to prevent cross-contamination, is to use a low concentration soap and distilled water solution. The rinsate (combination of soil, distilled water, and detergent)was captured in a sealed container, and tested for disposal as required by hazardous waste disposal facilities; the container was a labeled 55-gallon drum with a bung opening. During the initial and secondary sampling events, the soil samples were collected using a hand auger and the sampling equipment was decontaminated between borings by washing the auger core barrels in 5- gallon buckets containing non-phosphate detergent mixed with distilled water. The equipment was brushed with a long-handled brush; the brush was triple rinsed between samples to remove any remaining debris. The equipment was then rinsed with distilled water before continuing with sampling; the rinsate was collected in a 5-gallon bucket and then transferred to the 55-gallon drum. The auger was decontaminated before leaving the site so that any residual soil on the equipment was removed. One rinsate water sample was collected from the drum for analysis for disposal purposes during each sampling event. In accordance with EnviroTech's standard practice,the rinsate water sample was analyzed for: • Title 22 Metals; including arsenic and vanadium and • Bioassay Table 4 summarizes the analytical results from the two rinsate samples. 8.0 RECORD KEEPING The chain of custody form was completed by the field geologist daily. The form was signed by the field geologist when the samples were transferred to BC Laboratories. A copy of the chain of custody form was retained with the field geologist until transported to the EnviroTech office for scanning. An electronic copy and the paper copy will be retained in EnviroTech's files. Field notes were taken using EnviroTech's field notes form to document progress and any changes to the work plan based on field decisions. Field notes are retained in the project file in EnviroTech's office. Photographs were taken of the soil from each hand augured location.A photo log is included in Attachment 1. 5400 Rosedale Highway Bakersfield, CA 93308 Tel 661.377.0073 Fax 661.377.0074