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M 4M ASCANA W Mfr Working To Restore Nature INTERIM CORRECTIVE ACTION PLAN for G- Smith Canal Pumping Plant 2144 Fontana Avenue Stockton, California 1.0 INTRODUCTION F This report is being submitted at the request of San Joaquin County Public Health Services, w Environmental Health Division (PHSIEHD) to present alternatives for remediation of soil and groundwater contamination and to select an interim corrective action plan for the City of E Stockton (City) Smith Canal Pumping Plant located on Fontana Avenue in Stockton, California fy (Figure 1). The site was formerly occupied by a Waste Water Treatment Plant which maintained a 5,000-gallon underground (ulg) diesel storage tank for use by auxiliary power Jgenerators (Figure 2). - i]r €€,r ff3 2.0 BACKGROUND kf' An estimated 1,100-gallons of diesel fuel was reportedly leaked from the above referenced 5,000-gallon fiberglass tank as a result of an inadvertent puncture. The tank was repaired and returned to active service. f._ In May 1988, Ensco Environmental performed a limited investigation, advancing a single soil boring (13-1) beneath the northern (fill) side of the tank to a maximum depth of approximately E"I 17 feet below grade. A soil sample collected from this boring at 17-17.5 feet below ground surface recorded 130 parts per million (ppm) total petroleum hydrocarbons as diesel (TPHd). r Results of soil sample analyses are summarized in Table 1. As a result of this initial Er investigation, the PHSIEHD required further assessment of the extent of contamination at the subject site. rs Phase I of a subsurface investigation was conducted in October 1989 by WaterWork Corp. Six !r=� sail borings (SB-1, S13-2, MW-1, MW-2, MW-3, MW-4) were drilled at the subject site to depths ranging from 16 to 36 feet below grade. Four of these borings were completed as two- inch diameter groundwater monitoring wells (MW-1, MW-2, MW-3, MW-4). Soil boring tri _ W0365%REPORTSICAP0294.FNL 1 111111 r.- I;1. f- 4