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Sampling of Ground-Water Monitoring Wells September 4, 1990 <br /> Beacon Station No. 502, Lodi, California AGS 86091-8 <br /> The groundwater samples were analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg), and benzene, tolucae, c lvibenzene, and total xylene isomers (B'I'ER) usiit� <br /> Environmental Protection Agency Methods 5030 and 502 at Mobile Chem Labs Inc. in <br /> Turlock, California (Hazardous Waste Testing Laboratory No. 1223). The results of these <br /> and previous analyses are summarized in Table 3. Hydrocarbons were n^'_ detected in <br /> samples from wells MW-1 through MW-5 except for 0.6 parts per billion (ppb) of benzene <br /> in well MW-1. <br /> The next monitoring event has been scheduled for the week of September 24, 1990. We _ <br /> recommend forwarding signed copies of this letter report to Ms. Laura Cotulla of the San } <br /> Joaquin County Local Health District. Environmental Health Division, P.O. Box 2009, <br /> Stockton,California 95201,and Mr.Gordon Boggs of the California Regional Water Quality <br /> Control Board, Central Valley Region, 3443 Routier road, Sacramento, California 95827- a <br /> 3098. Please call if you have questions regarding this report. <br /> Sincerely, <br /> Applied GeoSystems <br /> John B. Bobbitt <br /> R.G. 4313 <br /> Attachments: Plate P-1: Site Vicinity Map <br /> Plate P-2: Generalized Site Plan <br /> Plate P-3: Potentiometric Map <br /> Table 1: Ground-Water Elevations on June 29, 1990 <br /> Table 2: Cumulative Results of Laboratory Analyses <br /> Field Methods <br /> Chain of Custody Record (1 page) <br /> Laboratory Analysis Reports (5 pages) <br /> 2 <br /> .4pp/ie� C�e�S�rstem� <br />