Laserfiche WebLink
1x. �v. LVVI ii.Vt iVVVVTI JTV . e--.u` iV. iV <br /> JAN. 8. 07 1 :39PM WARD REAL ESTATE 879-7213 No. 396 P. 112 <br /> PACIFIC <br /> ENVIRONMENTAL SES!' <br /> GROUP, INC. <br /> ' 13BY HAND <br /> FED EX 13 COURIER ! <br /> ups , A;rlr <br /> July 15, 1998 <br /> Project 9x0-017.1A <br /> Mr. Robert A.Bousx <br /> Unocal Corporation Company <br /> 2121 North California Blvd. <br /> Suite 250 <br /> Walnut Creeir,California 94596 <br /> Re: Work Plan r <br /> Former Unocal Service Station 0123 <br /> 1034 Central Ave. <br /> Tracy, California <br /> Dear Mr. Boust: <br /> This latter,prepared by Pacific Ewi iro=ental Gaup,Inc. (PEG)on behalf of Unocal <br /> Corpomfion (Unocal), presents a works pian describing proposed assessramt work at the <br /> site re6renced alcove(Figures l and 2). This work plan has been prepared in response <br /> to a letter from Mr. Michael J.Inn uzma Ir.of San Joaquin County Public Health <br /> Sen►ices�Environtxtetal Health Division(SJCPHS-EHD), dated February 20, 1998 <br /> (A,ttacbment A). The purpose of this work is to define the vertical and horizontal extent <br /> of diesel and gasoline hydrocarbons in soil and groundwater and to locate the source of <br /> end delineate solvent com=ination in soil and groundwater. Tbis will be me=p#ked <br /> by mi stalling one uggradiemt groundwater monitoring well(U-S), one off-site <br /> down3radient groundwgermouitoring well(UA6);`and one•continuoua core soil boring <br /> „ (,B-4) in the.locaticna of the former waste oil tank, A discrete water sample wall be <br /> collected fiam boring B-4, <br /> This work plan includes a briof discussion of site backgroarzd,previous investigations, <br /> proposed scope of work, and schedule. Field and laboratory procedures are presented as <br /> Attachment B, <br /> SITE BACKGROM%M AND PREV70[TS DWESTIGATIONS <br /> The site wa reportedly an operating Unocal service station iiom 1920 thrquglt 1962. <br /> Two underFound a torage tank(UST)complexes hays axiw d at the site. A cluster of <br /> three USTa located at the northern property boundary adjacent to 1115 Street were <br /> identified as"abandoned"and a sgoand cluster of drree,t=ka to the South wens <br /> idintificd as active USTs. The proporcy was pursued by Bask of A.maica and the <br /> service station was demolished in 1962, Tha USTs in the southern pard=of the site <br />