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S M1 F n Station No 6981. meat Plan—Farmer Tosco(Unocal)Sesv1ce I Rez�ledlal System Enhance August a,7001 EN �ONE AL�Ol lacement of the LISTS at'dn Soil PREVIOUS il samples during the rep ere detected h drocaTbons w ands of �NAlndustrtes collected so Petroteuixi Y Ilei 1,604 cubic y and 3une 1988, roducC dispenser islands Its ppproxim y'proximity of roads and Irl May acent to the p prod lines, and test p Due to the p A Sod vapor test pits excavated adl the UST pit, p acted could be removed ved frvrci�the site samples collected from h drocaTbon-imp ocarbon- Impacted soils weir,un ted be ore all e y hydr anon was residual hydrocarbons in the soil beneath the site _1 tough structuTes,overexcav r eractlan wells( 190 and survey was performed to assess the extent o 13 six vapo 1 through MW-13), een January of vaPor taring Wells M�+r` ]led on or near the'evaluate he feasibdtty , ilrteen groundwater mons 1 were ins ed In August 1992 was performed in Larch 199 test was perorm auudwatey. and one groundwater extraction ct an test( site An aquifer pulnP dTocaibon-urlpacted$T f)> Avapor ext August 1992 tion for soils beneath the lal option oundwater extraction to remediate Y of the end of the second extraction as a rerned of utllixing telnber 1994 d 01 t e(TP Hg) to evaluate the feasibillt3' rated uI a pub mode Operation at the site since Sep been in ope etroleunl hydrocarbons calculated as& 401 pounds of catox unit has 794 pounds of CoCal p ,VES is currently being ope 44 A �5 utiling a roxlrnately 14, and treated The ands of TPHg and No Petroleum quarter of 2001,app ne has been extracted and 183 pounds of beli=e the VES extracted and treated c01 Ihed in� second quarter of 2401, that asympot'c levels wincee'e Dc�iulle F2004 During the ears to Indicate benzene The data app detected In the Influents at the request of the city o x_13 were abandtlned widening of Pacific e hydrocarbon�ncentrations have MW-12, and M 3 M�-10, reconstruction of the Ir►ter5ection and lzl Februaxy 1995,wells Mme'- � ed to facilitate,eco This work was perform one groundwater Stockton 14 through NP .11,replaced the Avenue wells(N " ed three groundwater monitann� 'I`liese groundwater nlamtoTing List 1999,GR install boring( _g In Aug j)and advanced one soil sparging well(�- in February 1996 the site, Including two were removed from product wells that were abandoned 'Lescollected from beneath the USTs' and all related f les we e r rrximately 200 Soil samples A tocol of app In April ,the service station baso in U51 S utheast dispenser Ilion double-wall steel 9 impacted soil was avexexcavated vated to a depth 12, ,()-gallon g Islands All potentially s excavated frcxri beneath the nartST it was�er and dispenses In addition,the UST p million(ppm)°f lines, potentially iii'pacted soil was 0,,2'73 p M of xylenes, alts p cubic yards of p mediately north of thn ted West s n detected exceptlof TPHg and O 1 pp Islands and product fines Im les were rep sand 38 3 pp A""'the soil same th o f 4 feet bgs pf 21 feet bgs � eraser Island at 475 feet bnser Island at a dep or semi- . IS beneath the northeast dispenser t of the northwe5t dlspe led at the site on a quarterly roduct lines northeast of the wells beneath the p monitored an a 4 neve= been vb ed from not detected to 78,0Q0 quarterly basis since ee�9has 90 an sam Groundwater has been 1983 Floatng prod oundwater have rang well M -5)7 and not bon a"n9 ivations in the gr DOQ ppb of benzene ( 1 sampling event on annual basis since Apra] of detected to 28, carter 200 ")I hat Hlstorically�petroleum hydr H well�W-2), fl b of Tl'Hg(well'�- b of TP g{ Groundwater data for llllon (ppb) well -4) Histarlcally, P; per billion (PPb)of N1tl3�E(well Vw-3) arts pe of,,, detected to 4,900 pp ed from not detected to 34,400 p rch I and 8,2041 rang enc(well _7)5 and not detected to 350 ppl' Ma b of beti7 detected to 853 pp 2 I441?A 10