COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

Site Description The Las Vinas Dehydrator Station houses equipment and materials for removing moisture and particulates from, and adding odorant to, natural gas in PG&E's transmission system. The facility occupies a 1/2 acre site which is owned by PG&E. The dehydrator station is unstaffed and has been in operation since 1942. Buildings, structures and equipment located at the Las Vinas station are identified on the attached facility layout map. The station yard has a gravel surface. The yard contains buried and aboveground high pressure natural gas piping and equipment. The entire yard is surrounded by a 6-foot high, chain-link fence topped with barbed wire. There are two drive through gates to the facility. Background In the past, aboveground gas piping was coated with lead-based paints to prevent corrosion. Routinely, the piping was sandblasted in preparation for coating replacement. The material used was Green Diamond Abrasive, a commonly used and commercially available abrasive. The MSDS for the Green Diamond product is attached. The affected area is approximately 50 ft. by 25 ft. with most of the sandblast residue (approximately 15 yards total) visible underneath the above ground piping. Summary of Testing Samples were collected and analyzed for lead in residue. Three samples were collected from 5 locations from the visible residue. The three samples were composited by the laboratory (Chromalab, Inc.) for STLC. Results indicated that lead was present in the sample extract at 63 mg/L. The surface gravel and sandblast residue from the site will be scraped off, composite sampled, and disposed of properly to a Class I or Class II landfill depending on composite sample results. The remaining surface soils will be sampled to confirm that cleanup objectives have been attained. Remediation and Confirmation Sampling Phase I: An area of 1250 sq. ft (50'x25') and depth of 6 inches will be removed around the sandblasted piping, any remaining sandblast areas onsite will be scraped until the sandblast residue is no longer visible. Five confirmation samples will be collected from underneath the piping when visual removal of the sandblast ��uc/� •'� residue is completed. The scraped sandblasting residue will be placed in a 20 cubic yard bin, and composite sampled to evaluate proper disposal options. Appropriate wet methods (dust control) will be utilized during the sandblast residue removal process to minimize potential airborne dust particles.