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29 April 2005 AGE-IVC Project WNo. 98-0440 g18'. -Pa .. ' . . gip • . . . •- • .. ,,11 of • ' o S ... . 7 .. ln-Januaiy2002 ab ound-water samples were collected from.boriz s'B8'and B9 •t 60'.feet bs . •TPH-g was detected just above reporting limits in the grab water samples-at concentration and 88 µ9l1,•respectively.,TPH-d-was detected in the water sample collected from B9 at, a coriceritratibni of'140.4g/1.-Ethylberizene:and-total xylene's'were`detected in the sarnple.from B8 at concentrations of 1:2 µg%1 and 1..3 Vg/l'respectively. Toluene,ethylberizene and total xylenes'were detected iii the water sample collected fromlioring B9 at-concentrations of 0.62 gg/l;0:72.µg11 aitd . 4.3 µg%1,'respe'ctively._,-No other analytes including-benzene were-detected at or above laboratory reporting limits In the grab ground water samples analyzed. Based on the current area bounded by wells.MW-1 through MW42, the lateral 'extent-of the dissolved petroleum-hydrocarbon plume is defined;'additionally, ttie current concentmtions'.6f. € -dissolved IPH and BTEX compounds(benzene)detected at the'former UST area in samples from well MW-2 have declined to 1%.of 2.5 %o their respective highest concentrationg. The dissolved TPH=g concentration trends for.well MW-2 and MW-5 are depicted in Appendix D. TPH-g'and benzene.impact to ground water.is depicted iri plane view in Figures 7`and 8. The vertical extent is generally defined by,the very low concentrations of TPH-g; low'concentration.of TEX.below drinking water standards and absence of benzene-in the 60-foot grab ground;water samples. 5.0. POTENTIAL-IMPACT ON NEARBY•SUR.FACE AND GROUND WATER Typically, ground water would.represent the migration mediumf'for contaminants over significant horizontal distances.However,sites located in up-gradienforc ross-gradient directions from the.site are not likely to be negatively im acted-by the site. In addition;!first encountered ground water'is used.for 1.drinking or irrigation and.all ground water'in the State of California is considered tonbe of potential'beneficial use. J ` The water supply for the Strong Property located at 5157 West-Business Loop 205 was supplicd.by ' a�domestic well.(DW-5157)'23Q feet.west of the site. According';to Mr: Mike,Strong.tlie water line h extending t6'5157 from this'ddznestic Well was ruptii cd.iri 1998 arid subsequently,capped off.At the present there is no-water being supplied to.5157 WestBusiness Loop 205. This domestic well currently supplies drinking water to the adjacent properties:5161 and 51,63 West Business Loop 205. ; The domestic water wells located at 5225 and 5055 West Business Loop 205 are the most vulnerable for oterztial impact from the hydrocarbon iuine from the former UST area located at the Strong p P Y p ` .Property,. DW-5055 is located- directly down-gradient of the-ifformer UST-area. However, the dissolved contaminant plume does'not extend beyond wells MW-3'and'MW-10 towards DW-5225- nor-does it extend beyond wel1s'MW-7; MW-8, MW-1 f and,MW-12 towards DW-5055. Analysis of quarterly water samples froze the domestic well have.been non detect for petroleum'hydrocarbons. Adpanced GeoEnviranmental,Inc.