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1a/ '*_W <br /> San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,RENS <br /> Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> r. Carl Borgman, REHS <br /> Mike Huggins,REHS,RDI <br /> Cq'• _.�;p Website: www-sjgov.org/ehd Margaret Lagorio, REHS <br /> ���O¢ Phone: (209)468-3420 Robert McClellan, REHS <br /> Fax: (209) 464-0138 .left Carruesco, REHS,RDI <br /> Kasey Foley, REHS <br /> JONATHAN MARLOWE !JUL 2 3 ZU07, <br /> MARLOWE PROPERTIES <br /> 838 MISSION AVENUE <br /> SAN RAFAEL CA 94901 <br /> RE: Marlowe Property SITE CODE: 1828 <br /> 4696 Waterloo Road <br /> (formerly 4648 Waterloo Road) <br /> Stockton CA 95215 <br /> San Joaquin County Environmental Health Department(SJCIEHD) has reviewed Quarterly Report— <br /> First Quarter 2007(Report) dated June 27, 2007, submitted on your behalf by Advanced <br /> GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> One 550-gallon underground storage tank (UST)was removed from this site in January 1988. A site <br /> investigation began later that same year. The site underwent remediation by soil vapor extraction <br /> and air sparging (SVEIAS)from March. through December of 1999. Confirmation soil borings were <br /> advanced in July 2000. Two of the soil samples collected from the confirmation borings reported <br /> total petroleum hydrocarbons as diesel: 410 milligrams per kilogram (mg/kg)at 25 feet below surface <br /> grade (bsg), and 1:�13 mg/kg at 45 feet bsg. These results pass the environmental screening levels <br /> for potential threat to indoor air. <br /> There are currently nine groundwater monitoring wells and one soil vapor extraction well at this site. <br /> Groundwater monitoring and sampling is conducted on a semi-annual schedule. Analytical results <br /> have been non-detect for all constituents analyzed since December 2001, with the exception of <br /> 1,2-dichloroethane (1,2-DCA)which is consistently reported in four wells: MW-6, up gradient; MW-5, <br /> source area; MW-7 and MW-8, down gradient. The Regional Water Quality Control Board, Central <br /> Valley Region (RWQCB)will not concur with closure of contaminated UST sites that are not fully <br /> defined. Please prepare a work plan for the installation additional groundwater monitoring well(s)to <br /> define the lateral extent of the 1,2-DCA in groundwater. The RWQCB requested a minimum of three <br /> additional wells lateral to MW-8 (one down gradient, two cross gradient). The work plan is due for <br /> submittal to SJCIEHD no later than September 28, 2007. <br /> In the Report AGE recommends discontinuing analysis of groundwater samples for all petroleum <br /> hydrocarbon constituents that have been reported as non-detect since 2001. SJCIEHD agrees with <br /> this recommendation. Further groundwater analyses may be limited to 1,2-DCA. If you have any <br /> questions please call Lori Duncan at(209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, PG, RWQCB <br /> Brian Millman, AGE <br />