WORK PLANS - Laserfiche WebLink

Home Browse Search

Mr. Marcus Pierce, Engineering *ogist • February 2012 Central Valley Regional Water Quality Control Board Subject: Copper Sulfate Impacted Soil Removal footprint or in adjacent vehicle storage areas will be marked with spray paint on the ground surface. During a mobilization prior to that for excavation activities, OTIE will oversee the collection of representative samples of impacted soil for purposes of characterizing the material for disposal, and a groundwater grab sample to determine if groundwater may have been impacted by the copper sulfate material. This work will be performed by a California -licensed C-57 drilling contractor, using direct push technique. At two locations within the approximate outline of the excavation area (Figure 3), soils will be cored continuously to the approximate interface between copper sulfate materials and native soil (based on visual determination). Two representative samples of copper sulfate materials will be collected in each boring. One of the borings will be advanced to the occurrence of first groundwater (approximately 35-40 feet below ground surface, or bgs), where a groundwater grab sample will be collected. The four samples of copper sulfate material will constitute a four -point composite sample for waste characterization purposes, and will be analyzed for one or more of the following, based on waste impoundment requirements: • Total petroleum hydrocarbons (TPH) by USEPA Method 8015 -modified; • Volatile organic carbons (VOCs) by USEPA Method 826013; • Semi -volatile organic carbons (SVOCs) by USEPA Method 8270C • California Title 22 metals by EPA Method 601013/7000; and • Polychlorinated biphenyls (PCBs) by EPA Method 8082. The groundwater grab sample will be collected in sterile, laboratory -supplied containers, and transported with waste characterization samples under proper chain -of -custody (COC) documentation to a California -certified analytical laboratory, and analyzed for the following: • Dissolved copper as a metal using USEPA Method 6010B; and • Sulfate using USEPA Method 9056. Following completion of soil and groundwater grab sampling, the boreholes will be abandoned according to San Joaquin County Environmental Health Department (SJCEHD) regulations with neat cement and the top 3 feet backfilled with clean native materials (SJCEHD, 2005). Soil excavation, transport and disposal, backfilling, and site restoration activities are anticipated to be completed during one working day. The copper sulfate impacted soil will be excavated using a backhoe and directly loaded onto an end dump truck, then transported and disposed under waste manifest in accordance with all applicable state and federal regulations. Soil excavation will proceed until the extent of visually identifiable copper sulfate impacted soil has been removed. The excavation is anticipated to be approximately 15 feet wide by 15 feet long and 10 feet deep upon completion (approximately 85 cubic yards). Immediately after soil excavation is completed and concurrent with offsite transport of the impacted soil, confirmatory soil samples will be collected from the excavation bottom and from each of the sidewalls of the excavation. Soil samples will be transported under proper COC to the analytical laboratory, where they will be analyzed for arsenic and copper metals and sulfate, consistent with the methodologies described above for the groundwater grab sample. The purpose of these samples will be to confirm removal of copper sulfate impacted soil. A secondary objective will be to evaluate arsenic concentrations relative to the 1.6 mg/kg Region 9 PRG, although the Oneida Total Integrated Enterprises, LLC Page 3 of 6