Laserfiche WebLink
LEEDSHILL-HERKENHOFF, INC <br /> 303 Second Street, Suite 880 North <br /> San Francisco, California 94107 <br /> 4151243 9980 <br /> January 23, 1990 <br /> ' Jeanne M. Zolezzi <br /> Neumiller & Beardslee <br /> P.O. Drawer 20 <br /> Stockton, CA 95201-3020 <br /> Re: 102 South Wilson Way, Stockton <br /> i <br /> Dear Ms Zolezzi : <br /> Enclosed are copies of Leedshill -Herkenhoff's (LH) Preliminary Investigation at <br /> ' 102 South Wilson Way, Stockton, CA. This investigation was performed per the <br /> workplan dated September 12, 1989, as approved by the Regional Water Quality <br /> Control Board and Public Health Services, San Joaquin County. <br /> Five soil borings and two monitoring wells were installed on the property to <br /> determine possible areas of petroleum hydrocarbon contamination in soil and <br /> groundwater, and to determine groundwater gradients. Laboratory analysis of <br /> soil samples indicated that only one soil boring, TB5, located near the <br /> northwest corner of the property, indicated significant concentrations of BTX&E <br /> (benzene, toluene, xylene, and ethylbenzene) and TPH (total petroleum <br /> hydrocarbons) as gasoline. All other soil samples showed nondetectable or <br /> extremely low residual levels of BTX&E and TPH, levels which would not pose a <br /> threat to the existing groundwater resources of the area, according to the LUFT <br /> manual evaluation process. Groundwater sampling indicated high concentrations <br /> of hydrocarbons in the groundwater near MW2 and MW5, and flow in a generally <br /> easterly direction. Therefore, there is a concern regarding the possible <br /> offsite migration of petroleum hydrocarbons in the groundwater. <br /> LH recommends that a Phase II assessment be performed to better define the <br /> lateral extent of the existing soil contamination found in the northwestern <br /> corner of the property and to further address the groundwater problem. <br /> It has been a pleasure working with you on this project. If you require <br /> additional information please do not hesitate to contact Mike Tognolini or me <br /> Very truly yours. _ <br /> ISS10 <br /> Gerry S. Nakano, P.E. <br /> Vice President 0 ;7 <br /> 9832-12.1 tr/di(j/293(m) <br /> cc: Don Roek <br /> E ' <br /> SAN FRAA!CISCO o SAN, DIEGO DERNIER ALBUQUERQUE a SANTA FE o PHOENIX <br />