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66/25/2001 14 24 20946710 AGE ST©CKT©N PAGE 05 22 rune 2001 AGE-NC Project No 97-0333 Page 3 of 10 September 2000 prepared by AGE -- .I I,duly 2000-Initial ground water monitoring and sampling were performed at wells MW-1, MW-2,MW-3, MW-4 and MVS'-5 Ground water levels were measured between 15 and 16 feet below the tops of the well casings, ground water flow direction at the site was inferred to be flowing towards the north at an approximate gradient of 0 001 Laboratory analysis of ground water samples at the site detected TPH-g; at concentrations as high, as 140,000 micrograms per liter (,ug/l),ETEX compounds were detected at concentrations as high as - 28,000 40,MTBE and TAME were detected at concentrations as high as 980,000 ktgll No other petroleum hydrocarbon constituents or fuel oxygenated compounds were detected Results of the July 2000 investigation were reported in Quarterly.Report - Third Quarter 2000 dated 20 September 2000 prepared by AGE • August and September 2000-AGE conducted a sensitive receptor survey to locate potential vertical conduits within a 2,000 foot radius of the site The results of the sensitive receptor survey located a municipal water well (City of Manteca Well No 4) located approximately 1,900 feet northwest of the site near and a second municipal water well (City of Manteca Well No 5) located approximately 1,500 feet south of the site Results of the investigation were reported in Sensitive Receptor Survey dated 08 September 2000 prepared by AGE • 11 Ormher 2000- (-,rniind wster morutorino and sampling were performed at yells Mw-1, MW-2, MW-3, MW-4 and MW-5 Ground water levels were measured between 16 and 17 fact below the tops of the well casings, ground water flow direction at the site was inferred to be flowing tawatds the northeast at an approximate gradient of 0 001 Laboratory analysis of ground water samples detected TPH-g at the site at concentrations as high as 140,000 PfA, ETEX compounds were detected at concentrations as high as 28,000 ggfl,MTBE and TAMF were detected at concentrations as high as 980,000 �zg/l No other petroleum hydrocarbon constituents or fuel oxygenated compounds were detected during the laboratory analysis Results of the October 2000 investigation were reported in Quarterly Report - Fouitli Quarter 2DOD, dated 11 October 2000, prepared by AGE 18, 19 &ZO December 2000- 1~our sold borings (P 7, P-8,P-9 and P-10) were advanced on- site utilizing cone penetrometer testing(CPT)technology to characterize the geological and hydro-geological framework and to assess preferential migration pathways Based on soil composition data obtained from the CPT soil borings, cross sections C-C'and D-D (Figures 3 and 4)were constructed depicting the general subsurface soil composition on- and off-site Based on the CPT soil characteristics data, AGE identified four potential hydrogeologie units mform,ally identified as `.First Watef Zone" (located 15 to 47 feet bsg), "Second Watei Zone ' (located 58 to 92 feet bsg) 'Third Water Zone" (located 102 to 115 feet bsg) and ". 7imaiy Aquzfei Zone' (located 128 to 150 feet bsg) Significant fuel component anti r-hlnrsnatPri soh ent-mapact to ground i"ester v�as reported from the Ftrst Water Zone, low to i-i Lode iate f-uel L omnonenI anti chin7-1nated soh",t-impact,, aG reported trot 4,,resit, .hxax �d 1;eOF ii,re� r cufat