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Mr. Philip Isorena Proposal P93-040.31 <br /> July 12, 1993 <br /> Page 5 <br /> State Sources - Annual Work Plan (formerly bond Expenditure Plan); <br /> CALSITES (formerly ASPIS); Cortese List; Solid Waste Assessment Test; <br /> Solid Waste Information System; Leaking Underground Storage Tanks; <br /> Hazardous Waste Information System; Underground Storage Tank Permits <br /> Regional Sources - Leaking Underground Storage Tanks (Regional); Toxic <br /> Pits; Solid Waste Assessment Test (Regional); Well Investigation Program. <br /> Local regulatory agencies will be contacted to determine if records for adjacent properties <br /> contain information on hazardous materials, underground or aboveground storage tanks, <br /> emergency incidents, or permits. <br /> The evaluation of historical land use will consist of reviewing historical aerial <br /> photographs and interviewing Port of Stockton personnel to determine historical land use <br /> and tenancy. If possible, Port of Stockton records will be reviewed to determine land use, <br /> previous tenants, and possible sources of impact. <br /> Task 5. Cone Penetrometer Testing <br /> The vertical extent of petroleum hydrocarbon impact will be assessed using an interactive <br /> CPT and HydroPunch testing program. Stratigraphic data from various assessments <br /> conducted for the STTC facilities indicate that sand units (consisting of one or more <br /> lenticular sands) are encountered within specific stratigraphic horizons and have been <br /> designated A-zone, B-zone, C-zone, and D-zone sands, respectively. Sand units are <br /> separated by lower permeability silts and clays which may inhibit vertical migration of <br /> groundwater and petroleum hydrocarbons. Based upon review of the IPAR and data from <br /> assessments conducted by Harding Lawson Associates on the ARCO terminal, B-zone and <br /> C-zone impacts have been reported. <br /> The interactive CPT and HydroPunch program will assess the vertical and lateral extent <br /> of petroleum hydrocarbon impacts. At selected locations the CPT will be used to <br /> determine the lateral and vertical extent of respective sand units and the lower <br /> permeability silts and clays. The HydroPunch sampler will be used to collect groundwater <br /> samples within B-zone and C-zone sand units. If groundwater samples collected from the <br /> B-zone contain petroleum hydrocarbons, C-zone groundwater samples will be submitted <br /> for analysis. <br /> This approach will permit assessment of B-zone and C-zone impacts and provide <br /> stratigraphic data on the distribution of sand units. This approach will also allow for <br /> 5 AC/PRM3W9304031.bc-93 1mc:5 <br />