Laserfiche WebLink
i .0 <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair (a <br /> Alan C.Lloyd,Ph.D. Arnold <br /> Agency Secretary Sacramento Main Office Schwarzenegger <br /> 11020 Sun Center Drive 4200,Rancho Cordova,California 956706114 'COVED <br /> pq pE� Governor <br /> Phone(916)464-3291 •FAX(916)464-4645 (l����II\t/�I�I! II <br /> http.//www.waterbouds.ca.gov/centralvalley w lI V <br /> 7 March 2006 MAR 11 2000 <br /> Mr. Dale Gillespie ENVIRONIVIEiIT pERMIT/SERVICES HEALTH <br /> Geweke Land Development and Marketing <br /> PO Box 1210 <br /> Lodi, CA 95241 <br /> DOCUMENT REVIEW, CLEANUPAND ABATEMENT ORDER (CAO) NO. 93-701, <br /> GEWEKE PROPERTY, 16 SOUTH CHEROKEE LANE, LODI, SAN JOAQUIN COUNTY <br /> I reviewed the Quarterly Report—Fourth Quarter 2005 (Report), received 20 January 2006, and prepared <br /> on your behalf by your consultant Advanced GeoEnvironmental, Inc. (AGE). The Report provides the <br /> analytical results of the groundwater monitoring of fourteen monitoring wells (MW-7 through MW-9, <br /> MW-11 and MW-12, MW-14 through MW-22) on 5 December 2005 for the investigation of petroleum <br /> hydrocarbon pollution in groundwater at your property. The maximum groundwater results reported were: <br /> Total Petroleum Hydrocarbons as gasoline (TPHg), 4,500 micrograms per Liter(Rg/L);ethylbenzene, 23 <br /> Rg/L; xylenes, 271 Rg/L, and 1,2-dichlorethane (1,2-DCA), 6.1 Rg/L. The Report states that the depth to <br /> groundwater varied from 57.14 feet below ground surface (bgs)to 61.73 feet bgs. The onsite groundwater <br /> gradient varied from 0.002 foot/foot towards the south and 0.004 foot/foot towards the south in the offsite <br /> downgradient direction. The Report recommends continued groundwater monitoring, continued ozone <br /> injection, and a reduction in the sampling and analysis frequency of monitoring wells MW-17 through <br /> MW-22 from quarterly to annual. <br /> Comment: The revised Monitoring and Reporting Program(MRP) for CAO No. 93-701 states the <br /> following as notation 2 of the sampling and analyses table(enclosed): New wells will be sampled <br /> quarterly for a minimum of one year. If a new well is non-detect for all constituents at detection limits <br /> listed below, the samplingfrequency for that well may be changed from quarterly to annually. Since all <br /> of the wells that AGE recommends for annual sampling have been non-detect for all constituents at the <br /> required detection limits for at least four consecutive quarters, and are covered under the existing MRP, <br /> they are approved for annual sampling. You may call me at (916) 464-4615 or email me at <br /> jbartonawaterboards.ca.gov if you have questions or comments. <br /> James L. Barton, P.G. <br /> Engineering Geologist <br /> Enclosure <br /> cc: Mr. Harlin Knoll, San Joaquin County Environmental Health Services, Stockton <br /> Mr. Brian Millman,Advanced GeoEnvironmental, Incorporated, Stockton <br /> California Environmental Protection Agency <br /> 0%Recycled Paper <br />