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ENVIRONMENTAL HEALTH DEPARTMENT <br /> ' SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heron,RE.H.S. Carl Bergman,R.E.H.S. <br /> H Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> �.: 'c• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> '0Gc8R`'� Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> PAULINE MARQUAND MAY 15 2003 <br /> C/O SHAWN KELLY, M & M BUILDERS <br /> PO BOX 1107 <br /> TRACY CA 95378-1107 <br /> RE: M & M Builders Supply SITE CODE: 1530 <br /> 8111 Eleventh Street <br /> Tracy CA 95376 <br /> San Joaquin County Environmental Health Department discussed the potential for <br /> closure of the above referenced site with representatives of the Regional Water Quality <br /> Control Board, Central Valley Region (CVRWQCB) at a meeting on May 14, 2003. <br /> Five routine quarterly groundwater monitoring events have been conducted at this site. <br /> The last routine event was performed in September of 2002. Monitoring well MW-3 was <br /> reported to contain 900 micrograms per liter (µg/I) total petroleum hydrocarbons as <br /> diesel (TPHd). This quantity represents an increasing trend in the over all <br /> concentrations of TPHd documented in this well. <br /> Prior to consideration for closure, a decreasing trend of contamination must be <br /> established in the impacted well, MW-3. You are directed to continue routine quarterly <br /> groundwater monitoring at this site, and sampling of MW-3, until directed otherwise by <br /> this agency. Monitoring wells MW-1 and MW-2, which have not had detections of <br /> contamination, may be sampled annually. In addition, a calculation of contaminant mass <br /> remaining in the soil must be prepared and submitted for review. <br /> If you have any questions please call Lori Duncan at (209) 468-0337. Please provide <br /> forty-eight hours notice to SJC/EHD prior to any fieldwork. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Seni� orRE S Margaret agorio, Supervl ing REHS <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> John Lynch, Wright Environmental <br />