Laserfiche WebLink
' Quarterly R ort - Third Quarter 2002 <br /> • Quarte y ep <br /> BOB'S MUFFLER SHOP <br />' 466 Moffat Boulevard, Manteca, California <br /> ' 1.0. INTRODUCTION <br /> At the request of Mr. Tom Barbour of Bob's Muffler Shop, Advanced GeoEnvironmental, Inc. <br /> ' (AGE)has prepared this quarterly report for the property located at 466 Moffat Boulevard,Manteca, <br /> California. The scope of work included a quarterly ground water monitoring event and preparation <br /> of this report. The location of the site and,the immediately surrounding area are illustrated on <br /> ' Figure 1;structures,former UST locations and monitoring well locations are illustrated on Figure 2. <br /> Background information is summarized in the Preliminary Site Assessment Work Plan dated <br /> 30 November 1998 and Preliminary Investigation and Evaluation Report dated 10 August 1999, <br /> ' both prepared by AGE. <br /> 2.0. PROCEDURES <br /> ' Monitoring wells MW-1 through MW-10 were monitored and sampled on 18 September 2002. All <br /> field work was performed in accordance with guidelines issued by Central Valley Regional Water <br /> Quality Control Board(CVRWQCB)for the investigation of underground storage tank(UST)sites. . <br /> 2.1. WELL MONITORING AND EVACUATION <br /> ' On 18 September 2002, a Solinst water level meter was used to measure the depth to ground water <br /> in the ten wells relative to the tops of the well casings. After the depth-to-ground water <br /> measurements were collected,casing water in monitoring wells MW-2 through MW-7,MW-9 and <br /> MW-10 were evacuated using new disposable plastic bailers and wells MW-1 and MW-8 were <br /> evacuated using a Watera hydro-lift pump. Approximately 6 gallons of water were evacuated from <br /> ' monitoring wells MW-1 through MW-5 and MW-7 through MW-10; 12.5 gallons of water were <br /> removed from well MW-6. All purged amounts were equivalent to three casing-water volumes per <br /> well. , <br /> Temperature, pH and conductivity were measured at regular intervals- during purging using an <br /> ' Oakton water.analyzer to monitor pH, temperature and conductivity of the purged water. Purged <br /> water was temporarily stored on-site in properly labeled DOT-approved 55-gallon drums. The field <br /> data logs are provided in Appendix A. <br /> 2.2, COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each urged well with disposable bailers after allowing the wells <br /> p p <br /> . to achieve a minimum'80%.recovery of the.pre-purge water volume. Each water sample was <br /> J, Advanced GeoEnvi ron mental,Inc. <br /> 1 <br />