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1 z.- www eecworld com ENVIRONMENTALCONTR LIC #AHAZ-743267 ENGINEERING 6 CONTRACTING,INC. 515 N CABRILLO PARK DRIVE, SUITE #120 SANTA ANA, CALIFORNIA 92701 PHONE (714) 667-2300 FAX (714) 667-2310 ' August 8, 2002 Ms Margaret Lagono ' San Joaquin Valley Department of Environmental Health 304 E Weber Avenue ' Stockton, CA 95202 Subject Workplan for Investigation and Removal of Hydrocarbon-Impacted Soil at the Former Used Auto Sales Lot, 844 El Dorado Avenue, Stockton, California ' Dear Ms Lagono, On behalf of UniFirst Corporation(UniFirst), Envirom-nental Engineering and Contracting,Inc (EEC)has prepared this workplan to investigate and mitigate hydrocarbon-impacted soil that may exceed regulatory limitations and interferes with proposed construction activities at the site ' referenced above The location of the subject site is shown on Figure 1 The discovery of hydrocarbon impacted soil at the site has resulted in the shutdown of a major construction and redevelopment project at the site This shutdown is causing substantial economic loss and is causing project completion delays Therefore,on behalf of UmFirst,EEC is authorizing the San Joaquin County Department of Environmental Health (SJCDEH) to utilize ' personnel on overtime hours, if necessary,to complete a rapid review of this workplan Background The subject site is currently vacant and undergoing grading as part of a redevelopment project The project encompasses the entire city block bounded by Poplar Avenue on the North, Hunter Avenue on the east, Flora Street on the South, and El Dorado Avenue on the west The location of the subject property with respect to the city block is shown on Figure 2 On Tuesday August 6, ' 2002, during grading operations at the site, an approximately 250-gallon underground storage tank(UST)was discovered and unearthed Following the discovery of the small UST,UniFirst contacted EEC to investigate whether additional USTs were present,characterize any material ' within the tanks and to determine the steps necessary to delineate and remediate impacted soil at the site Since discovery of the UST, all redevelopment and construction activities at the site have been halted,resulting in a substantial cost to the proposed project due to the equipment and ' personnel that are mobilized at the site A Phase I Environmental Site Assessment conducted at the site by EEC in 1998, indicated that a ' gasoline service station may have been located at the site in 1950 The basis of this evaluation was a 1950 Sanborn Fire Insurance map that shows a building with the word"oil"on it The approximate location of the former building is shown on Figure 2 No other information was available to indicate the presence of UST's , 1 ' +Regulatory C(Imphanee +Engcnet ring +Wa+kwater Treitme.nt/Water Reu%e +Soil&Gn)undwiter]mesttgation/Remediation +General&Mechanical Construction