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-Envirgnm-ental ' <br /> Science <br /> Engineering,lric is h <br /> S 3'A CILCORP <br /> c-'-'. <br /> ME <br /> May 10, 1993 f r q c S h1AY :,'1 2 <br /> � '. 1,PUL3Cid <br /> N <br /> - 0 <br /> - <br /> Project-No.•6.792-5009' � ,r N <br /> r <br /> -'• Mr: Harlin Knoll <br /> r San Joaquin-.County Public Health Seivices~ =' <br /> 4 'Environmental Health Division- F t <br /> x"P.O..Bo -2009.: t t <br /> Stockton;°California;95201 ` <br /> fi <br /> _ 3 <br /> SUBJECT: AT&T.:Lodz''Facility, J110West XtrnerRoad, 1<.ody San Joaquin County,: 6 <br /> California (5an,-Joaqu�n County Site Code No: 1741)4 <br /> F N ,Dear Mr.•Kriol £n r <br /> E Environmental Science ,-& Eri meerin Inc <br /> (ESE): this£wor lan to conduct ' <br /> g* additional�siibsurfacemvestigation`m'ahe..area of;the former tank excavation at the'sAect r <br /> site {Figure 1 =Ste,-Plat} ; Ttie,scope.of wok is liased on telephone conversations between'•, <br /> L <br /> L.Kerry Lefever .:of ESE rand,Mr Harlin;!Knoll of the San Joagwri Cqunty Pubhc'Health <br /> Services; Environmental.Health'Division (PHS/EHD) 4 As-stated iri-the letter date Marc <br /> ` 2,.1993,.the PHS/EHDrequires•that additional investigation of soil and ground water.at'the <br /> ;t site be conducted before site closure wrll lie granted %The purpose-of this assessment is to: r <br /> . . <br />€ FPerform further assessinent>in the'area°of bot ink'- 2Y;�which- reportedly. � <br /> y <br /> contained asphalt chips, in-order to define any residual construction debnsL+f <br /> that may remain in the_subsurface, R` , <br /> L '+L <br /> s x n. drocarbons <br /> }; • To: assess `'if ground water; is impacted with 1 petroleum iy <br /> 3 d , downgradient of-the former fank pit ' , i a' `i x <br /> ' Site Background <br /> In Gate October.and early November,;1990 ESE drilled five b6nng5(three were converted^ <br /> to monitoring wells) within and' near athe former excavationr(FXgure,l) Soil bonng'B <br /> . was ternunated at an-a roximate.de�-th of I.5 feet below ound surface" b s. due to auger <br /> refusal by construction Pdebris-whi h may, represent fragments of b ckfi 1.:maxerialgor <br /> renirianis of thei,4fill seal :A'composzte grafi sample of soil cuttingsrreported to_contam <br /> asphalt chips was 'collected. at the direction of a County representative and analyzeda. ` <br /> x c .Pet <br /> Concentration of Totai roleumjIiydrocarbons as Diesel°{TPa was reporte' d•-at -110 L <br /> milli rams er,Kilo 'ram m K in th1s soil sam le ;:The anal cal results of soil samples- <br /> x h, . , P .. g (rng/. g) - P Yt, . <br /> collected'_from soil'borings MWJ1, MW 2 `and MW 3 (later converted to ground:water. <br /> x monitorin ' .wells) acid B=2X reported concentrations-of TPH=D less than 4 m K <br /> g� g <br /> 4090 Ne[son;Aven. Suite Jr € x s' Concord CA 94520= Phone'(510)685 4053 `, Fax(510)685 5323 �. <br />