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' CLOSURE REQUEST REPORT McAllister Trust 501 South Ventura Avenue Stockton, California ' 1.0 INTRODUCTION AND PURPOSE ' Smith Environmental Technologies Corporation has prepared this report on behalf of McAllister Trusts to present the results of first quarter 1996 groundwater momtonng and the information required for site closure review for McAllister Trusts' property located at 601 South Ventura Avenue, in Stockton, California (Figure 1) This report is being submitted to the San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) and the California ' Regional Water Quality Control Board, Central Valley Region (CRWQCB) to satisfy the closure review requirements, as outlined by CRWQCB correspondence dated October 7, 1993 (Addendum to Appendix A of the Tri-Regional Recommendations) 2.0 QUARTERLY MONITORING Groundwater monitoring was conducted on February 23, 1996, by Smith Environmental personnel On February 23, 1996 static groundwater levels measured in the four site wells, MW- 1R through MW4, ranged from 5 19 to 6 47 feet below the tops of the well casings Locations ' of the monitoring wells are shown on Figure 2 A gradient map for the February 23, 1996 monitoring event is shown on Figure 3 Groundwater flow was generally to the south southeast at a magnitude of 0 011 ft/ft or approximately 58 feet per mile Groundwater elevation data are 1 summarized in Table i Groundwater samples were collected from wells MW-1R, MW-2, MW-3 and MW-4 on February ' 23, 1996 Prior to sampling, a muumum of three well casing volumes of groundwater were purged from each well All purged water was contained in labeled DOT approved drums and ' stored on site pending laboratory analyses Groundwater samples were collected after stabilization of pH, electrical conductivity (EC) and temperature The samples were collected using dedicated, disposable bailers ' Subsequent to collection, the samples were placed on ice, secured, and transported under chain- of-custody protocol to State-certified Argon Laboratories, in Ceres, California The water samples were analyzed for benzene, toluene, ethylbenzene and xylenes (BTEX) utilizing EPA method 8020, total petroleum hydrocarbons as gasoline (TPHg) using EPA method modified 8015, and total petroleum hydrocarbons as diesel (TPHd) using EPA method modified 8015 w 1943361closure doc 1 1 � SMTN 1