ARCHIVED REPORTS XR0004970 - Laserfiche WebLink

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it • SIVUH . Laboratory Analysis The groundwater samples were analyzed by Argon Laboratories, a state-certified laboratory located in Ceres, California The samples were analyzed for the presence of total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, total xylenes (BTEX) using Environmental Protection Agency (EPA) Methods 8015 (modified) and 8020 Copies of the Iaboratory report and chain-of-custody documentation for the groundwater samples are presented in Attachment 3 No TPHg or BTEX were detected at or above laboratory detection limits in any groundwater samples collected trom the site monitoring wells Table 2 summarizes all past and current groundwater analytical results Hvdrogeology A potentiometric surface map (Figure 3) has been prepared using groundwater level measurements collected on May 25, 1995, and the surveyed elevation data (Table 1) The groundwater flow direction was toward the northeast with an average gradient of approximately 0 0013 tt/ft Conclusions and Recommendations Current groundwater conditions beneath the site (Table 2) suggest that groundwater in . the vicinity of the former fuel storage tank has not been significantly impacted by petroleum hydrocarbons Based upon non-detect results of groundwater samples collected in May 1995, Smith Environmental proposes to dispose of purged groundwater by discharge to the surface resulting in evaporation of purged groundwater Resorting Requirements Smith Environmental recommends a copy of this report be forwarded to Ms Linda Turkatte at the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), P O Box 388, Stockton, California 95201-0388 A copy should also be forwarded to Ms Elizabeth Thayer at the California Regional Water Quality Control Board, Central Coast Region (CRWQCB), 3443 Routier Rd , Suite A Sacramento, California 95287-3098 N 115000MPTS95 do,- 2