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PSI&SE I HYDROGEOLOGTC INYESTIGATION <br /> t <br /> 4491 WEST DURHAM FERRY ROAD <br /> TRACY, CALIFORNIA <br /> -- DELTA PROJECT NO. 40-91-732 <br /> 1.0 Ih"1'RODUCTION <br /> Delta Environmental Consultants, Inc. (Deita),has been awhorized by Ms. Stella Ruiz, the owner of the <br /> property, to conduct this AP=e I Hydmgeofogk Investigation in order to define the areal extent of the <br /> i - <br /> dissolved petroleum hydrocarbon plume. The site is located at 4491 West Durham Ferry Road, Tracy, <br /> California(Figure 1). <br /> t 1.1 Scone of Work <br /> Tha purpose of this phase of investigation was to detarailne depth to ground water, grand water flow <br /> �- direction,and whether ground water had been Impacted by petroleum hydrocarbons. Delta preformed the <br /> following activities to accomplish this objective: <br /> yy <br /> .� • Drillati,two 84uch-diamew soil borings to depths of approximately 25 feat and e m arted them; <br /> i <br /> -' to 24wb4&=W m al0ring wells MW-2 and MW-ton,kulpst 2804991. <br /> Y Collected soil samples at 5-foot Intervals with a modified California sampler for classification <br /> w, according to tete Unified Soll Classification System(USCS). <br /> 0 Screened recovered soil samples with a portable photoionization detector(PID)for the presence <br /> ; of total organic vapors. <br /> x a <br /> 1 Z • Selected and submitted two soil samples to a state-ardfled laboratory for chemical analysis <br /> using U.S.Environmental Protection Agency(EPA)Me od 8260 mod)fied for total petroleum <br /> -- -- 1- ----=- ltydrvctrbons (TI} I) psolinej - <br /> diesel benzenes tolluene--ethyUnzene,-and-xyiepes-- - -----=--—-—_,�- <br /> (BTEX)with a I0-wori.—day twrwourrl. y <br /> e LJ <br /> Strclltd 'tl, fboms oa Vlaqulnts tend Mored on alta. . <br /> t� <br /> sy PH1001.BP <br />