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Mr Chuck Carmel March 22, 1994 Pave 4 The remediation system at ARCO Station 434 consists of a groundwater extraction and treatment system (GWETS) and soil vapor extraction and treatment system {SUETS} The GWETS consists of one groundwater extraction well (E-1) with a designed pumping capacity of I gallon per minute Treatment of the extracted groundwater is accomplished with two granular activated carbon vessels,each having 1,000-pound capacity Groundwater is extracted from the well via a submersible pump Discharge of the treated groundwater is to the city industrial sewer system under Wastewater Discharge Permit No 151 issued by the City of Lodi Public Works Department Installation and start-up of the GWETS occurred in October 1992 The GWETS was shut down on April 19, 1993, due to nondetectable concentrations of hydrocarbons in the water The SVETS consists of eight soil vapor extraction wells (VE-1, VE-2, VE-3, VE-4, VE-5, VE-6, VE-7 and VE-8) and a soil vapor treatment system The soil vapor treatment system is composed of a vacuum compressor pump followed by a King-Buck-Hasstech catalytic oxidizer that has a design treatment flow rate of 100 cubic feet per minute (ctm) of soil vapor The system is operated under Permit to Operate No N-1081-1-0 issued by San Joaquin Valley Unified Air Pollution Control District Influent concentrations appear to be steadily declining, indicating that the hydrocarbons are being successfully remediated To date, the operation of the SVETS has remained at 46,709 pounds of TPH and 143 pounds of benzene This calculates to 7,534 gallons TPH (gasoline) Proposed Activities ARCO proposes drilling and sampling ten soil boreholes (B-3 through B-12) in the locations shown on Figure I These locations were chosen based on soil sample analytical results and historical groundwater analytical results Four to five soil samples will be collected from each soil borehole as described in Attachment A, Soil Sampling During Drilling The soil boreholes will be drilled as described in Attachment B, Borehole Drilling Groundwater at this site has dropped an average of nearly 10 feet since monitoring began in April 1987 At least one of the soil samples will be collected from the zone between the highest recorded Groundwater level and the current saturated zone from each borehole The soil samples will be submitted to an ARCO contract laboratory for analysis of BTEX and TPH as gasoline (TPH-G) using the Environmental Protection Agency (EPA) Method 8015/8020/5030 If hydrocarbons are identified in the soil in the on-site boreholes based on field instrument indications and observation, soil vapor extraction wells may be installed in the boreholes A site safety and health plan has been prepared for this site, which will be adhered to during the field work Use or disclosure of dura contained on this street 13 subject ro the restriction specified at the beginning of this docionem r 39518 EPORMWORKPLA Y