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i V PG&E UGSF-WSS -2 - February 28, 2018 SO4, and the Extractable Petroleum Hydrocarbons (EPH) Diesel and Motor Oil. All sample results were below the applicable USEPA Residential Regional Screening Levels (RSLs) or Department of Toxic Substances Control Screening Levels (DTSC-SL) with the exception of Arsenic. Comments and Directives: Comment#1; Arsenic was detected in the North, South, East, West, And Center samples at concentrations ranging from 2.2 milligrams per kilogram (mg/kg) to 5.5 mg/kg. The West (3.4 mg/kg), South (4.4 mg/kg), and Center (5.5 mg/kg) samples exceeded the USEPA RSL for Industrial Soil of 3.0 mg/kg. A review of the (PG&E) McDonald Island Compressor Station C-51 Tank Site (Site) located at 1181 Zuckerman Road that is approximately 2,200 feet southwest of the excavation reveals an average background concentration for arsenic of 6.27 mg/kg was calculated using a four-point composite sample. While the West, South, and Center samples exceeded the Industrial Soil RSL they appear to be below the regional background concentration. No additional assessment for arsenic will be required at this time. Comment#2: In email correspondence dated January 22, 2018, the Central Valley Water Board approved backfilling of the excavation with clean fill material and disposal of the soil stockpile. Prior to granting a no further action status for this Site, documentation of the backfill of the excavation including the status of the stockpiled soil must be received. The Central Valley Water Board staff requires a report documenting the backfill of the excavation be submitted. This report should include all relevant lab data pertaining to the sampling of the excavation and status of the resulting stockpile. The report must be submitted by April 30, 2018. In addition to a hard copy you are also required to submit all documents in electronic format to the State Water Resources Control Board's GeoTracker database pursuant to the California Code of Regulations (Title 23, Section 3890 et.seq.). Guidance for electronic information submittal is available at: http://www.waterboards.ca.gov/water issues/programs/ust/electronic submittal/. Please note that this requirement includes all analytical data, monitoring well latitudes, longitudes, elevations, water depth, site maps, and boring logs (PDF format).