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Hollis Street, Suite A <br /> ° <br /> Emeryville, California 94608 <br /> Telephone: (510)420-0700 Fax: (510)420-9170 <br /> CONSEO TOGA-ROV ERS http-//www.craworld.com <br /> CIATES <br /> Reference No.070001 <br /> February 7,2013 <br /> V <br /> Mr.John Yoakum,Senior RENS <br /> San Joaquin County <br /> Environmental Health Department FEB 13 2013 <br /> 1868 E.Hazelton Ave. <br /> Stockton,CA 95205 <br /> ENVIE1�f1NMcNTAL HEALTH' <br /> Re: Soil Sampling-Waste Profile Characterization PERIJdTISERVICES <br /> RCCI Property-Wastewater Evaporation Ponds <br /> Intersection of Lathrop Road and <br /> Existing Union Pacific Railroad Tracks <br /> Lathrop California <br /> Dear Mr.Yoakum, <br /> On behalf of Union Pacific Railroad Company(UPRR),Conestoga-Rovers and Associates(CRA)has prepared this <br /> letter to explain our purpose of drilling project to collect soil samples at the UPRR-BCCI Property Purchase(Site) <br /> located in Lathrop,CA.Per the attached email this letter will satisfy the San Joaquin County Department of <br /> Environmental Health's request for a work plan for the drilling permit <br /> SITE HISTORY <br /> The Site is located in a mixed agricultural-industrial,unincorporated area west of the City of Manteca in San Joaquin <br /> County,California(see Figure 1).The Site is bordered by UPRR's Intermodal Terminal and fallow agricultural land <br /> to the northwest and north;by the Cal Suprema Cheese facility(Suprema)and an almond orchard to the east and <br /> south east;by a concrete plant,an almond orchard,and Lathrop Road to the south,and by the South San Joaquin <br /> Irrigation District(SSJID)Irrigation Canal,UPRR tracks,and the Sharpe Army Depot to the west(see Figure 2). <br /> The Site has several former wastewater evaporation ponds associated with the neighboring DeGroot&Sons property <br /> to the east,currently occupied by Suprema(see Figure 2). Wastewater related to cheese and whey production and <br /> cleaning operations at the Suprema facility was discharged to the ponds. The ponds were active from the mid-1990s <br /> to approximately 2002. The ponds have steep sides up to 10 feet(ft)deep and are currently dry and overgrown with <br /> vegetation. <br /> PURPOSE OF DRILLING WORK <br /> Under the authority of California Regional Water Quality Control Board-Central Valley Region,UPRR is planning <br /> to excavate soils from the former evaporation ponds.Prior to UPRR's planned excavation of the former evaporation <br /> ponds,CRA plans to collect soil samples for waste profile characterization purposes.CRA will oversee Vironex,Inc. <br /> drill 10 direct-push soil borings to a maximum of eight feet below ground surface within the former evaporation <br /> ponds. CRA will collect two soil samples from each boring at various depths.The soil samples will be analyzed for <br /> CAM 17 metals by EPA Method 6010B/7471A.The data will be used to obtain approval of disposing excavated soils <br /> at a nearby landfill. <br /> Equal <br /> Employment Opportunity <br /> Employer <br /> Worldwide Engineering,Environmental,Construction,and IT services <br />