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f <br /> February 20, 1992 <br /> Beacon Station No. 492, i♦'lanteca, California <br /> :asnnles were anal�ted far total pj.troleurn llycls•ocarbuns as gasoline <br /> The groundwater r nc Ll'r1) llethods 5030 and 8015 and <br /> 30 <br /> (TPHg) llsillg larvirontrl�lltal l rotectl4ll Ag' S' <br /> benzene,toluene, cthyibenzene. arlcl total �5'I`iLasf'�°�tafy[ical3fr<ty ro nmesual Laboratories in <br /> and 6t}2. `I'kte samples were anal}cc�i at r\pp <br /> The results <br /> asle <br /> Rancho Corclov 1. C,SIJOr•ni"l(Hazardousoils <br /> f nsTaUljjjjg L 3 Conabo rcentora ons)of TPHg and <br /> of these and previous analys <br /> es BT <br /> EX in santpies collected from wells i411V`1. ti11�V-2, and ;�i1V-3 were bel <br /> ow detection <br /> limits for the analytical methods used. <br /> Ground-Water Gradient <br /> n December 13. lc)91, :� techsliciall froslt R e Natcllwerll►eadltefevatiolns�vereeusedr in tlto <br /> three onsite wells (Table 4). <br /> The water 1 <br /> evaluate vile stround-`vater gradient. It onsle oinlctheltgrocnld-NVa1eI'lelevations were vrttlten <br /> 13 i991, was essentially flat. D otent�ometric surface map was <br /> measurement error of the instrument used and no p <br /> AN <br /> generated. <br /> 1Vo�'k in Pro ress <br /> u ed a work plait for further assessment at the <br /> At the request of Ultramar Inc..we have prep: ' <br /> work fan includes the snslallation of an add Tale additional swell will be <br /> site. The p <br /> downt;radient of the existing nlonitorinu wells and tanl:cavity. in <br /> ,tailed to evaluate`whether previously detectedtolseo ccwlved fttely measure ydrocarbons are <br /> the Still <br /> directiont f <br /> 'n �ndin <br /> the gro[lrui water underlying the site <br /> approval of the work plan is p- g <br /> v;a ground-water flow and gradient. Reg <br /> si <br /> �4 1�13kear 2 <br /> 36102.6 <br /> �i <br />