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04 May 2006 AGE-NC Project No 04-1214 Page 2 of 6 purged water was monitored for temperature, pH, and conductivity at regular Intervals during purging using an Oakton water analyzer Purged ground water was containerized in properly labeled, Department of Transportation(DOT)-approved 55-gallon drums and stored on-site Field sheets and data are included in Appendix B Following purging,groundwater samples were collected using a dedicated and disposable bailer and placed into 500 ml,unpreserved plastic containers Split samples from each well were submitted to two laboratories, CalTech Environmental Laboratories (CTEL), located in Paramount, California and McCampbell Analytical Inc (MAI) located in Pacheco, California Both laboratories are certified for nitrate analysis by the California Department of Health Services (DHS) The ground water samples for nitrate as nitrogen(NO3 as N)analysis were properly labeled, stored in a chilled container and transported under chain of custody to the laboratories February 22,2006 Sampling Event Monitoring Wells MW-103 and MW-104 were sampled on 22 February 2006 Prior to purging, depth-to-water measurements were obtained from each well using,a Solinst water level meter Each well was then purged of at least three casing volumes a Waterra inertial pump equipped with5/8-inch diameter polyethylene tubing and a check valve The purged water was monitored for temperature, pH, and conductivity at regular intervals during purging using an Oakton water analyzer Purged ground water was containerized in properly labeled DOT-approved 55-gallon drums and stored on-site Field sheets and data are included in Appendix B Following purging, samples were collected using a Waterra inertial pump and placed into two 500 ml plastic,unpreserved containers, labeled, stored in a chilled container,and transported under chain of custody to CTEL and MAI,for nitrate as nitrogen(NO3 as N) analysis, in accordance with EPA methods EPA 300 0 or 300 1 March 7,2006 Sampling Event Monitoring Wells MW-103,MW-104,and MW-5 were sampled on 07 March 2006 Purging of the wells was performed by The Source Group, a consultant representing the City of Ripon A representative of AGE was present to witness the purging of the wells and to collect a split sample for laboratory analysis The Source Group utilized a Solinst water level meter to measure depth-to- water Each well was then purged of approximately three casing volumes The purged water was monitored for temperature, pH, and conductivity at regular intervals during purging using a water analyzer Purged ground water was containerized in properly labeled DOT-approved 55-gallon drums and stored on-site Following purging, AGE collected a set of samples from each well and submitted splits to CTEL and MAI for nitrate as nitrogen (NO3 as N) analysis, in accordance with EPA methods EPA 300 0 or 300 1 The samples were collected Into 500 ml, unpreserved containers, placed in a chilled Advanced GeoEnvironmental Inc.