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JbVALON <br /> ENVIRONMENTAL <br /> CONSULTANTS <br /> 1 RTH TusnN AvENuF - Sura 213 -TUMN,CAUFORNIA 92780 941 SHon oiw CouRT - Sum F121 -AlAmEDA,CAuFORNIA 94501 <br /> 4)8366632 - FAx (714)836-6642 TEL (510)5212441 - FAx (510)521 2607 <br /> 1 <br /> August 17, 2001 <br /> Public Health Services San Joaquin County <br /> Attn Ms. Margaret Lagono <br /> 304 East Weber Avenue, Third floor <br /> Stockton, California 95201 <br /> Subject: Work Plan for Offsite Groundwater Assessment and Monitoring Well Installation <br /> at Joe's Truck Stop, at 15600 South Harlan Road, Lathrop, California. <br /> Ms Lagorio <br /> Pursuant to your request, Avalon Environmental Consultants(Avalon) is pleased to submit this <br /> work plan to perform a Groundwater Assessment and Monitoring Well installation at Joe's <br /> Truck Stop at 15600 South Harlan Road in Lathrop, County of San Joaquin, California This <br /> investigation will consist of installing four groundwater monitoring wells, one on the subject <br /> property and three on a property adjacent and north/northeast of the subject property The <br /> purpose of this investigation is to monitor levels of Methyl Tertiary Butyl Ether (MTBE) and <br /> other hydrocarbon contamination in the groundwater both on and offsite and to determine the <br /> limits of impact The offsite impact was previously identified through groundwater grab <br /> r samples collected by Avalon during a Phase II Site Assessment dated April 15, 2001 Elevated <br /> levels of MTBE as high as 2,600 parts per billion (ppb) were identified in the groundwater in <br /> borings located approximately 300 feet north/northeast of the subject property Due to these <br /> elevated levels of MTBE, the county has requested that groundwater monitoring wells be <br /> installed in order to obtain repeatable data and determine the severity of the impact <br /> t <br /> This investigation will consist of drilling and sampling four groundwater monitoring wells <br /> onsite and offsite of the subject property. Three wel Is will be located on the adjacent property <br /> to the north, and one of the wells, which will test a deeper horizon, will be placed on the <br /> subject property downgrading to the former tank pit Once monitoring well construction is <br /> 1 complete, and the monitoring wells have been developed, the locations and top of casings <br /> will be surveyed by a State Licensed Land Surveyor Once this is complete, the wells will be <br /> given one week to stabilize, prior to measuring and sampling. This will allow groundwater <br /> levels to stabilize, thereby giving accurate data. <br /> Soil and groundwater samples will be analyzed for Total Petroleum Hydrocarbons as Gasoline <br /> . (TPH-G) by EPA Modified 8015, Benzene, Toluene, Ethyl Benzene, and Xylenes (BTEX) by <br />