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• 04 Nugust 2000 AGE-NC Pi oject No 98-0521 Page 7 of I I ' - on-site-in 55-gallon;DOT apps oared di ums _ 1 T 3 2 5 Collection of Gi ound Watei Samples - - Pi ioi to collection of gi oundwater saml les, the depth to gi ound water was measui ed in each well ' to ensue e that a n�ummuni of 80% of the well volume had i echai ged Watei samples wet e collected fi om each well using a nein disposable plastic bailee and ti ansferi ed into thi ee chilled 40-rnl VOA vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative The samples were then ' labeled and placed in a chilled containei for ti ansportatioin under chain-of-custody to MAI 3 2 6 Well EleN ation Sui veyiing- - — - ' The casing elevation of each monitor ing well NN ei e sur veyed i elative to City of Stockton Bench Mat k 253 to the-neai est-0"0I feet on 14 June 2000 by a California state-licensed sue vey engineer fi onn - -- -Bauinbach & Piazza, Inc The sue vey data is sun-a-nai ized in Table 1 The surveying i eport is • pi esented in Appendix C ' 3S SOIL AND GROUNDWATER ANALYSIS All gi ound watei samples and selected soil samples wei e analyzed foi the following ' 1 8015 Modified each iangeofh rdiocaibons, z - - TPH-g and 7FPH-d by EPA Method .� } - • BTE&1 by EPA Method 8020, and - • Oxygenated compounds,-DIPE, ETBE MTBE, TAME and TBA by EPA Method 8260 ' Modified - 4o [+1ND[\GS— 4 1 STRATIGRAPHY AND DEPTH TO GROUND WATER ' h of a i oxnnatel lin genera] the soil profile consisted of tan and of gray silt fi onn a dept pp y 5 feet to 15 feet bsg Sand with varying pei centages`of silt was typically encoiintei ed at 15 feet bsg in a 1 majoi ity of the b©i ings, hmN ever, sevei al bor rugs encounter ed this soil type at depths of 20 and 25 . feet Locally blue-gi een silty clay was pi esent at depths bew een 25 and 30 feet bsg Soil boi ings ai e depicted in Appendix A_ A sti atigi aphic ci oss section is depicted in Figui e 3 _ - —� r Ids unci d Gi�Cm Ei unmco:lal Isoc '