Laserfiche WebLink
FILE COPY '*- . <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> �o•_ �oG Unit Supervisors <br /> _ 1:2 Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> %i 304 East Weber Avenue, Third Floor <br /> �•< <` `:� Director Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • 6q• P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �iFORc� 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 /> ANDY EGGIMAN UL 18 2002 <br /> C/O ROBERT EGGIMAN <br /> PO BOX 580 <br /> MOUNTAIN RANCH CA 95246 <br /> RE: EGGIMANS HYDRAULIC Site Code: 1914 <br /> 1112 E. Harding Way <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Workplan to Further Assess the Vertical and Lateral Extent of Petroleum <br /> Hydrocarbons at Eggiman, Andrew, and Edith Trust Property (WP), dated <br /> 14 June 2002, prepared by ATC Associates, Inc. (ATC). The proposed scope of <br /> work includes advancing six borings to collect soil and ground water samples, <br /> procuring laboratory analysis of selected samples, completing at least one boring <br /> as a ground water monitoring well, and preparing a report of findings. <br /> To date, 10 soil borings have been advanced on the site to depths ranging from <br /> 16 to 56 feet below surface grade (bsg), of which 3 borings have been completed <br /> as ground water monitoring wells with total depths of approximately 55 feet bsg. <br /> Soil impacted by petroleum hydrocarbons or methyl tert-butyl ether (MTBE) has <br /> been encountered at depths as great as 55 feet bsg, although the more intensely <br /> impacted soil has been encountered at depths ranging from 5 to 35 feet bsg. <br /> EHD concurs that the vertical extent of impacted soil on the site has been <br /> adequately delineated. <br /> In November 2001, ground water was encountered at approximately 43 feet bsg <br /> in the ground water monitoring wells and had a northward flow direction at a <br /> gradient of 0.001. Ground water monitored by all three wells was been impacted <br /> by total petroleum hydrocarbons as gasoline (TPH-g), MTBE and <br /> 1,2-dichloroethane (1,2-DCA). Benzene, toluene, ethyl benzene and total xylenes <br /> (BTEX) and tert-butanol (TBA) have been variously encountered in the samples <br /> collected from the wells. Neither the vertical extent nor the lateral extent of <br /> impacted ground water has been delineated. During the November 2001 ground <br /> water monitoring event, ground water monitored by MW-2 was most intensely <br /> impacted by TPH-g and benzene, while that monitored by MW-3 was most <br /> intensely impacted by MTBE and 1,2-DCA. A northeastward flow direction and <br />