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Coca-Cola Enterprises - West Job No. 90054 This interfingering of strata continued to the full depth of exploration (about 90 feet). 6.4 WELL INVENTORY SURVEY It is USTECs opinion that a well inventory survey is not needed for the Coca-Cola site in Stockton, California. This opinion is based on the very low concentrations of hydrocarbons ry found in the groundwater,groundwater contamination has not migrated off-site and a "monitor only" groundwater remediation plan is recommended for this site. Also, according to local goverrnmentaI laws only the location of existing wells can be released to the public and not the pertinent subsurface information. 6.5 GROUNDWATER FLOW PATTERNS The:depth to groundwater at the site'ranges. from 67.41.to:67.99 feet-below land surface.' To evaluate the groundwater flow direction at the site, all groundwater monitoring wells were surveyed by Mid-Valley Engineering, Inc. of Modesto, California. The well elevations were established from level circuits carried from the City of Stockton Benchmark No. 77. The "+ accuracy of this survey was plus or minus 0.02 feet. z f Table 2 lists casing elevations, depth to groundwater, and water table elevations for MW-1 s through MW-5 on September 17,1990. A representative groundwater elevation contour diagram is illustrated on Figure 12. "Ile groundwater flow direction beneath the site appears to be towards the northeast with an approximate gradient of 13.9 feet per mile. 7.0 HYDROCARBON DISTRIBUTION 7.1 ]FREE PRODUCT DISTRIBUTION No free product was discovered by USTEC personnel during any of the assessments at the site. 7.2 DISTRIBUTION OF HYDROCARBONS IN SOILS The distribution of petroleum hydrocarbons in the soil is illustrated at the depths indicated on Figures 5, 6, 7 and 8. The distribution patterns shown in the figures indicate the area of 16