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f v • Interim Remediation Work Plan - July 2001 MEL BOKIDES PETROLEUM-MANTECA �� r , 983 Moffat Boulevard,Manteca, California l JUL 17 2001 ENVIRONMENT 1.0. INTRODUCTION PERMIT/SERviG At the request of Mr Nick Bokides of Mel Bokides Petroleum(MBP),Advanced GeoEnvironmental, Inc(AGE)has prepared this work plan for intenm remediation at 983 Moffat Boulevard, Manteca, California (site) The scope of work Includes installation of a dedicated low-flow ground water "pump-and-treat" interim remediation system at the site The location of the site is Illustrated on Figure 1 A plan of the site is Illustrated on Figure 2 On 11 April 2000,the San Joaquin County Public Health Services- Environmental Health Division / (PHS-EHD)directed by letter to install and continuously operate a pump and treat system in the area of the highest ground water methyl tertiary butyl ether(MTBE) contamination (Appendix A) This Interim remediation work plan has been prepared to address this directive 2.0. BACKGROUND The site is located In a business/agricultural area of eastern Manteca, California, in San Joaquin County (Figure 1) The property currently is being constructed as a gasoline station The site is located at the Intersection of Moffat Boulevard and Cowell Avenue, in an area of low topographic relief, at an elevation of approximately 48 feet above mean sea level (Manteca Quadrangle, 7 5- Minute USGS Topographic Series, 1968,photo revised 1976) 2 1 UNDER GROUND STORAGE TANK REMOVAL AND OVER-EXCAVATION On 10 September 1998, four USTs, including two 3,000-gallon gasoline USTs, one 4,000-gallon gasoline UST and one 12,000-gallon diesel UST, and two dispenser Islands and associated product Imes were removed from the site These tanks were in operation at the site for approximately twenty years The former UST locations are depleted on Figure 2 During the removal of the USTs and fueling system, approximately 350 cubic yards of soil were removed from two UST excavations and four dispenser excavations On 15 September 1998, an additional 100 cubic yards of significantly diesel-Impacted soil was removed from the bottom of the diesel UST excavation Soil was cxeavated from the diesel UST excavation at the central area of the site to a depth of 20 feet surface grade(bsg) One grab water sample was collected from the northern edge of the diesel UST over-excavation The soil left in place was impacted by low to moderate concentrations of total petroleum hydrocarbons as diesel (TPH-d) Advanced GeoEnvironmental,Inc i