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Additional Site Assessment and Ground Water Extraction Workplan Former Hess Dubois Cleaners 348 West Hardin;; Wad, Stockton, California LO. INTRODUCTION AND SCOPE OF WORK At the request of 111 r. Peter �b'allacc. .f�hcn�cc�c! GeoFnvironmental. Inc. (AGIj has prepared this work plan for additional investigation at the 6ormer l less Dubois (1caners located at 48 1Vest I lardin(u, A'av in Stockton, California. Hic location of file site is illustrated in Fi"tn-e 1 and a plan of the site is depicted in F'i"urc 2. The scope 01'wNork includes: the installation oI'iota, shallow (,round water monitoring:? wells and mo deep IIrotuid «eater monitoring wells and performance of a "round water- extraction pilot study and continued (Iuarterly I.Ironnd water samplinLp. This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board (('VRWQCB) guidelines 601- the subsurlace irtvesti"ation of underground stora21e tank ((_ISI-) sites 2.(). BACKGROCND AN[) SITE LOCATION The site is located in a husinesslresidential area of low topographic relief in Stockton. California. 1 he site consists of one I.-shaped hudding alonL, Harding NVay and hale-rock paved parking at the rear of the huildin". The site is presently occupied by a dry cleanino btlSinCSs. a real estate office and a sion company. ?.1. US'l RFMOVAL 1"i'-dit tuldcl-round storage tanks (USTs) «wre remox�ed From the site by Falcon Fil rp�v Associates (11"A) in .tanuat-v 1991. AGE has hGen informed that the tanks contained Stoddard solVcnts used in dry cleanirn" processes. Tanks No.,,;. 1 tht-01,10h 7 vere removed from a common excavation along the southern portion or the property (tank pitNo.I ). Tank No. 8 was removed IWill beneath the sidewalk alone Van Brunn Street (tank pit No.2). Analysis of soil samples collected fi-om tank hit No.I indicated an unauthorircd release of petroleum hvdrocal'l,ons: petroleum hydrocarbons were not detected in the samples collected 11-oin tank pit No. 2. ?.1 ",ITE A,SI:SSMFNT?/ INSTALLATION OF GRO(IND WAITR MONITORING; WELLS Over the asscssrarcnt period. a total ofseven "round ,eater monitot'.in-u, �,vclis and two ,oil borirt, have been installed at the site to assess the vertical and lateral extent of impacted soil and "round ��rltcr. A total of 1q aground x.Nater monitoring events have occurred at the site. Idvanc d(;CItV virnnnnCntal, Inr.