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' 0 ' Preliminary Site Investigation Work Plan SIERRA LUMBER MANUFACTURERS (CASE 2) 375 West Hazelton Avenue, Stockton, California ' 1.0. INTRODUCTION At the request of Mr.Bob Long of Sierra Lumber Manufacturers,Advanced GeoEnvironmental,Inc. ' (AGE)has prepared this Preliminary Site Investigation Work Plan for the property at 1617 North California Street,Stockton,California(the site).The work is being performed as required bythe San Joaquin County Environmental Health Department(SJCEHD)by letter dated 05 November 2004. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. ' This workplan was prepared in accordance withAppendixA of the Tri-Regional Recommendations- Reporting, dated 30 August 1991,prepared by the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The site area is located approximately 500 feet north of West Scotts Avenue between South Van Buren Street and South Monroe Street in a topographically flat area of Stockton,California(Figure ' 1). The site is occupied by Sierra Lumber Manufacturers, a wood-products processing and manufacturing facility. Prominent features of the site are illustrated on Figure 2. 2.1. PREVIOUS INVESTIGATIONS ' An investigation of underground storage tanks(USTs) formerly located at the southwest corner of the maintenance shop(Tank Area A)is ongoing.A total of eight ground water monitoring wells,six soil vapor extraction wells and five in-situ air sparging wells have been installed as part of the 1 ongoing investigation and remediation. An SVE/IAS remediation system has been operating at the site since April 2001. ' In June 2004,a series of soil borings were advanced at the site by Alta EM,Inc. (ASMI). Three soil borings (Alta-B3, Alta-B7, Alta-B8) were advanced near the southeast corner of the Plant #2 building,in the area of a former UST(Tank Area B).Petroleum hydrocarbons were detected in soil and ground water samples collected from the boring advanced within the presumed former tank pit excavation. Total petroleum hydrocarbons quantified as gasoline (TPH-g) and volatile aromatics ' (benzene,toluene,ethyl benzene and xylenes;BTEX)were detected in soil samples at concentrations UP to 4,960 milligrams per kilogram (mg/kg). TPH-g and BTEX were detected in a grab ground water sample collected from boring Alta-B3 at concentrations up to 400,000 micrograms per liter ' (ug/1) and 25,300 ug/l,respectively. Locations of wells installed for the investigation of Tank Area A and the approximate locations of borings advanced and sampled by AEMI are illustrated on Figure 2. Advanced GeoEnvironmental,Inc.