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r 3 <br /> a Eli <br /> P <br /> May 2, 1991 <br /> Status ReportAGS 38053-4 <br /> Former Texaco Service Station, Manteca, California <br /> on. Results of <br /> Our geologist e ail samples from the sidewalls of the soil samples indicated detectable concentrations� <br /> laboratory analysesysescollectedoof thwore of hydrocarbons <br /> evious <br /> med by Applied <br /> were not present in the eds do omen edin thetreporisr tied n the attached references list. <br /> GeoSystems and Canon <br /> ie <br /> geologist from Applied Geo5ystems was at the site in December 1989 and March,July, <br /> and October 1990 to sample ground water from the wells and to measure the depth to <br /> ground water. The evaluated direction <br /> ing and ranged fromd-water flow snorihwest t the site aslightlY <br /> fairly <br /> consistent throughout the four quarters of monitor <br /> west of north. The gradient ranged from 0.0012 to 0.0019. Results of laboratory analyses <br /> ig ecember 1989 event indicated that, in <br /> of ground-water samples collected earbonsrirtdecrhe eased ince the preliminary investigation. <br /> general, the concentrations of hydrocarbons <br /> Furthermore, the concentrations of hydrocarbons in groundwater samples generally have <br /> decreased or remained below detection limits during subsequent monitoring events. These <br /> results are shown in Table 1. <br /> B dl olr'Ed:levele'of hydrocarbons in ground water have decreased to below defection" <br /> . .i71t hsd "sMCHa :td5tx.3 i;C'yiY�4"aw�n3'.e jh of hydrocarbons <br /> Iimttis esalasie by tlie. aboraflr]'we n. a commended discontinuing, uarte 1y sarstpli g and <br /> and:initiated quarterly morutonng. .._ r . <br /> annual basis for l year rTf after 1 years. <br /> asyttiattri8 <br /> iorutorsng of.the ground water on a se}tu' S or <br /> es levels'rof dissglVed shediDb b he' C <br /> -remain-below, <br /> ifo iia 1 Department-Maximuor of oHea th Sikt� tervices, we <br /> drinking water establ� Y <br /> recommended:clos�sig"tire:sste-to further environmental'woeL Therefore, we have not <br /> performed environmental work at this,;.site during the first quarter of 1991. We have <br /> scheduled the next sampling eNentfor;;xttne 13c1:1 <br /> 2 <br /> AP,01149d Ge®Systems <br />