Laserfiche WebLink
California R*ional Water Quality Pontrol Board <br /> vCentral Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretatyfor Sacramento Main Office .- - Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—mgcb5' <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 ' <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 2 March 2001 <br /> Joseph Zilles <br /> Kleinfelder <br /> 2825 East Myrtle Street <br /> Stockton, CA 95205-4794 <br /> DISCHARGE FROM SHALLOW AQUIFER PUMP TEST, LATHROP, SAN JOA QUIN COUNTY <br /> I have reviewed Kleinfelder's 26 February 2001 letter requesting a Waiver of Waste Discharge <br /> Requirements (WDRs) for the discharge of pumped groundwater to land. The groundwater will be <br /> generated in a 24-hour aquifer pump test. The pumping test is being performed to estimate aquifer <br /> parameters for groundwater modeling activities. The pumping test maximum anticipated flow rate is 15 <br /> gallons per minute. <br /> The pumping well (MW3) is located approximately 1,400 feet west of the intersection of Parkway Road <br /> and Christopher Way in Lathrop. The groundwater will be discharged to land approximately 500 feet <br /> from the pumping well on the same parcel. All the water will be contained on-site and will infiltrate into <br /> the soil. <br /> The pumping well was sampled for chemical analysis on 29 January 2001 and the analytical results were <br /> transmitted to the Regional Board. Groundwater samples were chemically analyzed for priority pollutant <br /> metals, total metals, mercury, conventional chemistry parameters, anions, specific conductivity, <br /> organochlorine pesticides and polychlorinated biphenyls,phenolics, cyanide, total Kjeldahl nitrogen, <br /> purgable volatile organic compounds, acid and base/neutral extractables, and microbiological <br /> parameters. Only methylene chloride (17 µg/1)was detected at a level of concern for the pumping test <br /> activity. Because methylene chloride is a common lab contaminant, the detection is not considered <br /> significant. <br /> Based on the information provided by Kleinfelder,we find that the test pumping of the fresh water well <br /> should not contain constituents of concern that may pose a threat to water quality. Therefore, WDRs are <br /> not required for this discharge. Kleinfelder is responsible for obtaining landowner permission to <br /> perform the pump test and discharge the water. All the water discharged shall be contained on site <br /> through construction of berms or careful application of the wastewater which prevents runoff. <br /> Should new information come to our attention that indicates a water quality problem or if you change the <br /> nature or scope of the waste discharge at the facility, you may be required to submit a Report of Waste <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />