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vanc .e - GeoEnvironmental, Inc. 13 June 20.01 ; .AGE NC Project`No.'9.5-0185 T _ *�' ,c;�• - =" � �C��[�;r�� [� - ' _ r - - � �% �. a �� ;. . .• JUN. I S 2301 Mr. Harlin KnolllV1�IRONNIEUT 1," San Joaquin County ' y. 'ERI�I fJSI i �r((_1krh' . f 1.IL S Public Healtli Services.-Environmental Health Division _ 304 East Weber Avenue, third floor.' Stockton; CA- 95205. _- Subject: Additional Site'Investigation Work Plan_Addendum t - SHOCKEY AND SONS TRUCKING _, ,4_'. t. 850 Milgeo Ai4ihue, Ripon,.California' ' _" 1 Dear Mr. Knoll. - _ the request of Mr: Lee-Shockey, Advanced-beoEnvironmentai, Inc: (AGE) -has prepared the- enclosed work plan addendum for the vertical.definiiion.of the dissolvedhydrocarbonplume. AGE - proposes-.to install four discrete soil probe borings to:vertically delineate dissolved petroleum= : hydrocarbon impacted ground water. _ ;a Sol] sample collected from the former,underground storage tank (UST) area limited the vertical- extent of hydrocarbon-impacted soil above'a depth of ihirty feet below surface grade. The soil type ,- at thirty feet bsg and thirty-fivel'feet-bsg was predominantly sand (Figures 3 and 4). Th�e.vertical'_ tff- definition of the dissolved hydrocarbons-has not,been assessed below 35 feet bsg, monitoring well MW-I to MW-3,'and has not been assessed below 30.feet,bsg-in the.'UST area, well screen for y monitoring well MW-4. _ - _ L _ The proposed locations are illustrated in Figure 2 The proposed soil borings will be advanced to— depths o depths of 40 feet and.45 .feet below_'surface grade,.a discrete grab around water sample will be collected from each probe The soil probe borings procedures were approved. in the`Preliminar v-Sail aiid Grou td Water '�.:: F Investigation, dated.14 Novembdr`1995. 837:Shaw Road,Stockton,California 95215 ?` Tekhonc (209)467-1.006 FAX-(209)-4674 1 i • .. .Y: _ � -' --�. ..--�'.k� .-_� . ✓.a vA__ .utk7.d-v_- .w_,. �2 .. x..�`.a.... .1..- .-,-. .v - � .1-..�:..+v1,u�..--- -_ s.s-_._