WORK PLANS - Laserfiche WebLink

Home Browse Search

09/07/2004 14:41 2094671118 AGE STOCKTON PAGE 05/10 Ground Water Aquifer Pumping Test Report - First Quarter 2001 CHAPIN BROTHERS, INC. 1766 Monte Diablo Avenue, Stockton, Calij[ornia 1.0. INTRODUCTION At the request of Mr.Russell Chapin,Advanced GeoEnvironmental, Inc. (AGE),has prepared this ground water aquifer pumping test report conducted at 1766 Monte Diablo Avenue, Stockton, California. The site setting is illustrated on Figure 1. Site structures and monitoring well locations are depicted on Figure 2. The objective of the work was to obtain general ground water aquifer characteristics and to evaluate aquifer response to ground water extraction at variable and constant pumping rates. This report is prepared in accordance with guidelines established bythe California Regional Water Quality Control Board- Central Valley Division for investigation of underground storage tank(UST) sites. Background information and a description of prior investigations at the site are included in the Problem Assessment Report (.PAR) prepared by Science 8r. Engineering Analysis Corporation (SEACOR) dated 22 July 1994 and in numerous AGE-prepared Quarterly Reports. 2.0. GROUND WATER AQUIFER PUMPING TEST On OG March 2001, three temporary ground water elevation wells (one-inch) were installed surrounding well VE-6. On 07 March 2001, an eight-hour ground water aquifer pumping test was performed at the site to assess the general ground.water aquifer characteristics and to assess aquifer response to groundwater extraction utilizing wells VW-6, temporary wells T1, T2 and T3 and well MW-3 at a variable pumping rate; purged ground water was containerized in an on-site (5,500-gallon poly tank (Baker tank). On 12 and 29 March 2001., separate twelve-hour pump tests were performed; the first (12 March)pumping from VE-6 at 3 gallons per minute, the second(29:March)pumping froze MW-4 at 1 gallon per minute for 2 hours, then at 2 gallons per minute for 10 hours. A four-inch diameter Grundfos submersible pump was utilized to evacuate water from the pumping wells for the 07 March and 12 March tests, a two-inch diameter Grundfos submersible pump was used to evacuate water from the pumping well .for the 29 March aquifer test. The pumping rate for each test was determined by measuring the time required to fill a 5-gallon bucket from the pumping discharge hose. Adpanted GeoEnv[ronmental,Inc