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I <br /> ALON <br /> ENVIRONMENTAL <br /> CONSULTANTS <br /> 131 NORTH TUsTiN AVENUE • SUITE 213 •TUSTIN,CALIFORNIA 9278.0 _ "941 SHOREPOINT COURT'• SUITE F121 •ALAMEDA,CALiFORMA 94501 - <br /> TRC.=(714).836-6632 •FAx:(714)836-6642 TEL:(510)521-2441 FAx:'(510)521-2607_ <br /> July 26, 2001 <br /> Public HealthServicesSan Joaquin County <br /> Attn: lvls. Mar-.garet:Lagorio <br /> 304East Weber Avenue,-.Third floor' - <br /> "' Stockton, California 95201 <br /> Subject:Work Plan for Additional Groundwater Assessment at Joe's TruckPlaza, at 15600 <br /> South Harlan Road, (athrop, California. <br /> Ms. Lagorio: <br /> Pursuant to,your request,Avalon_Environmental Consultants(Avalon) presents this work plan <br /> ' <br /> to-perform. soil and-.groundwater-assessments at joe''s Truck Plaza-at 15600 South <br /> Harlan Road in Lathrop,- p, County of-San-Joaquin, California. The additional investigation is <br /> prompted by..a letterfrom.Public Hea'Ith_Service_s San-Joaqu n County (PHSSJC) dated June_1; <br /> _ ... . <br /> 2001; in which further characterization of the subject property was requested. In a recent-, <br /> -investigation-dated April 15.,,2001,-the limits of Methyl Tertiary=Butyl Ether (MTBE) impact. <br /> could.not-be determined. This additional -investigation will-consist. of performing-additional- <br /> soil-and groundwater testing further offsite with_a-geoprobe d-- e. . The purpose dthis <br /> investigation-is to determine,to the eztentpossible;the horizon.tal.and"vertical:limits of MTBE,_ <br /> and other hydrocarbon contamination in the :groundwater at. the subject property <br /> Additionally, 'a feasibility study will be performed in-order-to determinethe. effectiveness--of- <br /> groundwater extraction. <br /> This investigation will consist of.performing continuous cores collected.from six geoprobe <br /> borings placed, offsite to the north and to the northeast in-an area currently occupied by a-sel;f <br /> storage facility. Select soil- samples will-be analyzed for Total Petroleum Hydrocarbons as <br /> Gasoline (TPH-G) by EPA Modified 801-5,._for Benzene, Toluene, Ethyl Benzene;and Xylenes <br /> (BTEX) by EPA Method 8020 and for Oxygenated:-Compounds which will=include:_Tertiary <br /> Butanol, MTBE, DIP'E, ETBE, TAME and lead scavengers by:-EPA Method 8260. - <br /> Groundwater samples will be analyzed from each of-the' geoprobe locations for Total <br /> Petroleum Hydrocarbons as-i Diesel-(TPH-D) :by. EPA Modified 8015, for:-Total.Petroleum <br /> Hydrocarbons as Gasoline (TPH-G). by EPA Modified 8015; for -Benzene, Toluene, Ethyl <br /> Benzene, and Xylenes (BTEX) by EPA Method 8020 and for=Oxygenated Compounds which <br />