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Advanced <br /> ' <br /> GetoEnvironmental =Inc. <br /> } <br /> ' - z ads- <br /> 17 November 1998 <br /> . Al r • �� <br /> ;. AGE-NC Project No.95:6 i'85 <br /> Mr.:HarlinI{noll � 4� Nb, <br /> w San.Joaquin County PHS=EHD - .� �f Ira"� { �r j3le �µy' <br /> P. O. Box 398. P-r- <br /> Stockton, CA 9:5201 <br /> k ~. Subject:. Addition of Hydrogen Peroxide Ground Water Iavestigation�Y' <br /> _ SHOCKEYTRUCKING <br /> 850 Milgeo Avenue,Rapon, California _ r W <br /> t <br /> _ `Dear Mr. Knoll: s ;; <br /> At the request of Mf. 'Lee Shockey; Advanced GeoEi virorimerital, Inc._(AGE) has prepared:has <br /> re ared the_enclosed work_' lan for'the addition-of h. dro en, eroxide'to round water.and. round: <br /> P p P Y g P g g <br /> F water monitoring at 850 Milgeo Avenue in Ripon, California: ' <br /> 3 . <br /> f ! BACKGROUND <br /> Six USTs were removed m April 1994 from,three separate excavations on the property: o_ne waste <br /> oil UST;`one-dieselrUST; and four unleadedgasoline USTs Petroleuin.hydrocarbons tyere detected' <_ j <br /> in soil samples collected,from be the'USTs during removal~.Soil excavated during the:UST: r_w <br /> a <br /> removals.was used to`backfill each excavation Clean soil was imported to,"cap'-' each_excavation <br /> ' On 12 December.1995, five'{5) soil probe borings were.advanced `at the srte On O6-and 07 June . ' <br /> .1996, an additional four- soil borings Mere drilled at the site ar�d";completed_as ground water <br /> j :'monitoring we11s::B6rmg Ba' {MW-1} .was advanced on.`the northern_side of the Highway 99 "'+ <br /> s Frontage Road;in_the'Ci_ty of Ripon Right-0f,.Way;..boring B2 (MW=2)was advanced,south of the <br /> - - <br /> former UST excavation;boring:B3 (MW-3)was established west of the fomlerUST_excavation; and. ; <br /> i _boring B4.(MW-4) was advanced ori the southwest corner of the forrner UST excavation. Ground <br /> water monitoring data hasIndicted a significant concentration of die5ekin the groundwater at and. <br /> surrounding the�s teat the 1'ocations of wells MVV-1'ani MVV-4 <br /> Y L'= <br /> Site lustoiy and findings from previous mvest2gations and the previous monitoring event at the si e_' <br /> are detailed in th elPreliminary Investigation and Evaluation Re ort:PIER prepared b. .AGE, dated <br /> 15 August 1996. r -; <br /> , <br /> WioW "Cat Northif6ni'a'95205, <br /> ,.- -:(266)- <br /> _17 <br /> - <br /> - - • 4 =1 FAX 209 '467-i'l 1�8 ; . <br /> - -. ':�Tele 'f-ione' 209 67 Oab - - <br />