ARCHIVED REPORTS_XR0012741 - Laserfiche WebLink

Home Browse Search

CROWN AND CALt)WELL `iii'\', CONSULTING ENGINEERS r1'��i March 21, 1988 Mr.Fran Forkas Water/Wastewater Superintendent City of Lodi 1331 South Ham Lane Lodi,California 95242 017-3214-01/1 Subject: Disposal of Treated Groundwater From the Pump Test at ARCO Station 434,501 Kettleman Lane,Lodi,California 5 Dear Mr.Forkas: On b--half of ARCO Petroleum Products Company (ARCO), and per our March 16, 1 988, fF conversation, Brown and Caldwell is requesting permission to discharge treated groundwater to the City of Lodi (City) sanitary sewer or storm drain system. The pump test will be performed at the. ARCO station located at 501 Kettleman Lane, Lodi, Califomia (ARCO Station 434). The locatior of the project site is shown on Figure 1. The pump test will be operated for 3 days at a pumping rate of 20 to 30 gallons per minute(gpm). A site investigation of ARCO Station 434 indicates that contamination of the underlying tc k a unfc-r due to q petroleum products has occiured (Brown and Caldwell, September lb, 1987). To collect tale contaminated groundwater for subsequent treatment a groundwater e:.tr€ction well must be installed. An extraction well pumping rate capable of collecting the contaminated plume will be based on parameters derived from the aquifer pump test. s Groundwater Extraction Well The groundwater pumping rate for tite aquifer pump test is estimated to be above 20 to 30 gpm. For a pump test of 3 days, the total estimated groundwater pumpage is 86,400 to 129,600 gallons. The extraction well will be installed to a depth of at least 100 feet and screened through most of the.penetrated saturated interval. The minimum 100-foot depth will ensure collection of the petroleum product diffusing in the vertical direction. The product concentrations in monitoring well 2,located nearthe proposed extzaction well,are: j 1235STREET WRAIAENTO,CA95814•(916)441-0123