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Chevron Products Company 5 <br />Former Chevron Service Station #9-5775, 301 West Kettleman Lane, Lodi, Califomia June 5, 2001 <br />sampling event, MtBE was reported in on-site A and B -zone monitoring wells located to the east, <br />• west, south and southwest of the former USTs at concentrations ranging from 0 63 ug/1 (MW -8A) <br />to 2,000 ug/l (EX -3) <br />Historically, MtBE has not been reported in sentry well MW -8S During the most recent monthly <br />sampling (4126101) MtBE was reported at a concentration of 3 0 ug/l <br />• <br />2.3 Recent Assessment Activities and Findings <br />23.1 Soil Borings and Monitoring Well Installations <br />Between October 6, 2000 and February 22, 2001, seven (7) soil borings (B4, B6, B8, B9, B10, <br />B11, and MW -8S), nine (9) groundwater monitoring wells (MW -7B, MW -8S, MW -9B, MW -IOC, <br />MW -17B, MW -18B, MW -19C, MW -20A, and MW -20B), and one (1) groundwater extraction <br />well (EX -3) were drilled and installed at the site by Cascade Drilling and Western Strata <br />Exploration (WESTEX) <br />Stratigraphic information obtained from the soil borings was used as a guide to assist in placement <br />of well screens in continuous water -bearing zones. The screen intervals of the momtonng wells <br />were selected to provide groundwater water quality and potentiometnc information from specific <br />areas within the aquifer Well locations and completion depths were made with the final approval <br />of Mr Marty Hartzell of the RWQCB The intended purpose, screen interval, and total depth of <br />the newly installed wells are presented below <br />BORING <br />ASSOCIATED <br />INTENDED PURPOSE <br />SCREEN ' , <br />TOTAL,DEP TH <br />WELL <br />INTERVAL ' <br />B6 <br />MW -7B <br />B -Zone Monitoring Well <br />77-81 <br />81 <br />B8 <br />MW -9B <br />B -Zone Monitoring Well <br />78-83 <br />83 <br />B10 <br />MW -10C <br />C -Zone Monitoring Well <br />107-112 <br />112 <br />B9 <br />MW -17B <br />B -Zone Monitoring Well <br />76.5-795 <br />79.5 <br />Bl l <br />MW -18B <br />B -Zane Monitoring Well <br />80-85 <br />85 <br />B5 <br />MW -19C <br />C -Zone Monitoring Well <br />105-110 <br />110 <br />B4 <br />MW -20A <br />A -Zone Monitoring Well <br />51-66 <br />66 <br />B4 <br />MW -20B <br />B -Zone Monitoring Well <br />77-82 <br />82 <br />MW -8S <br />MW -8S <br />Sentry Well <br />205-210 <br />210 <br />EX -3 <br />EX -3 <br />Groundwater Extraction Well <br />60-80 <br />80 <br />I 1Chevron1957751ParFrpl9-5775PARFRP2 doe <br />