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11.0 INTRODUCT[ON Thts report present, the results of groundxNater monitoring activities f6i the second caleiidat quarter of 1999 at 900 1/2 1✓a�,t Victor Road in Lodi, California The property is owned )y Teresi Trucking Company The ,vork was conducted in ac,coidance with proposal 499017 and appro%ed by the San loaquin Countv Public Health Sei\ices Environmental Health Division (PH;/EHD), which is the lead a�l,:n(.v responsible for regulatory ON ersight 2 0 BACKGIZOU?i D 2.1 Site Location ,ad Deser iption The `3 eresi Tiuckint, y ai d is located east of U S highway 99 in Lodi, Cal i fornia (Figure 1) Most ofthe site 13 pa-,ed for Mick parking 1«o large bUildin<L's for stoiage and truck mainten ince ate also present on the Stte S urounding parcels are dzvoted to industrial and comnierc,iai u,es 2.2 Pre iotas Wort,. Oil Decembei 1, 1 Y)5, thi ee undei pi ound storage 1 antis "ei e removed by Jim Thorpe O 11 fi oin the rear portion oftlle facility (Fi4ure 2) The tank, stored diesel and unleaded gasoline and had been used to tuel cornpan, trucks Eight sod samp'es were collected from beneath the trnks when . they tir,cic removed and simples NNere also collected from the dispenser )sland, piping trench, and soil stockpiles Geu_ynalyIical Laboratories analyzed the samples for the piesence of petroleum hNdiocarbons in th,- diesel and gasoline ranges foi volatile aromatic hydrocarbons, and for total lead Contamination piimaifly in the diene, range, was detected in several samples I horpe perl'ormed additional erca\ation to remove the remaining= contaminated soil froin the excavation Diesel +tia5 detected at concentrations of 3,000 and 6,000 mg/kg and gasoline was detected at concentiation� of 60 and 800 mg/kg in two bottom samples, and PHS/EHD then mstructcd l eresi T reknit to submit a t,,oil: plan for assessing the extent of this contain inalion In early 1996 fi\e 'Coifing,, including three monitor wells were drilled and twenty-five ,oil samples and six water samples v eie collected for analysis Diesel "vas detected in one sell sample and t"o. ground,�Nattr &.rnples and a program of grotuidwater monitoring was initiated The rtiells v,eie Sampled cluring the second tniJ z,nd fourtn quartets of 1996, at .4hlLh ime little or no groun&\atet ,,ontan ination v�as detected No furtrier Aork was required by San ,lcaquin County at that time but the case �.\as not closed and the cells were allowed to remain it place No further monitoring of othet investigations have taken place, but recently (April 1999), PHS/EHD requested two idditional quarters of water sampling to determine the present status of the site PHS/EHD also requested that a v ell (potential receptor) survey be conducted, and alter discussions xNith Uponaditxnt En-vironmental �t was decided to conduct such a sutvev it contamination xkas detei.tt d ciiiring either quarter t