ARCHIVED REPORTS_XR0007763 - Laserfiche WebLink

Home Browse Search

IQuarterly Report - Fourth Quarter 2003 MANTECA CITY CORPORATION YARD I210 East Wetmore Street, Manteca, California I1.0. INTRODUCTION I At the request of Mr Frederic Clark of the City of Manteca, Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 210 East Wetmore Street, Manteca, California The site and the surrounding area are illustrated on Figure i Structures and Iwell locations are illustrated on Figure 2 2.0. PROCEDURES Ten ground water monitoring wells (MW1 through MW10) were monitored and sampled on 17 November 2003 Field work was performed in accordance with guidelines issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites I 2 1 WELL MONITORING AND PURGING On 17 November 2003, the depth to ground water in all ten monitoring wells was measured from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level meter Ground Iwater elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation(Table 1) After water levels were measured, between 3 5 and 4 25 gallons of water(a minimum of 3 casing- water volumes per well)were purged froze monitoring wells MW 1 through MW6 and MW8 through MW 10 using dedicated,disposable plastic bailers Approximately 2 0 gallons of water were removed from well MW7 before the well was purged dry using a dedicated, disposable plastic bailer Ground water temperature,pH and conductivity were measured at regular intervals during purging using an Oakton water analyzer Field sheets and data are included in Appendix A Purged water was stored in properly labeled DOT-approved 55-gallon drums and stored on-site 22 COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each purged well using new disposable plastic bailers after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water sample was transferred into one 1-liter amber bottle without sample preservative and into three 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample . preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to McCampbell Analytical,Inc (MAI),a California Department of Health Services-certified analytical laboratory, for analysis The samples were analyzed for Advanced GeoEnvironmental,Inc f