Laserfiche WebLink
_ a, f <br /> San Joaquin County DIRECTOR <br /> A0 U"!!Y Donna Heran, REHS <br /> Environmental Health Department M ASSlSTA NT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Mike Huggins,REHS,RDI <br /> ogGl. o ��P Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> FZ Robert McClellon,REHS <br /> Phone: (209) 468-3420 Jeff Carruesco, REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley,REHS <br /> May 12, 2009 <br /> i <br /> Ms.Beverly Garcia <br /> Raymond Investment Corporation <br /> Post Office Box 567 <br /> Stockton, California 9520I <br /> Subject: Raymond Investment Corporation <br /> 730 Channel Street <br /> Stockton, California 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Site COnCeptual Model <br /> 2008 (SCM) dated October 31, 2008, and analytical data for <br /> submitted by Condor Earth Technologies, Inc. (Condor) on your behalfatContamiter nans oftconcern erly in nave <br /> been detected in groundwater samples collected from monitoring well MW-4 but not in samples collected } <br /> from the other monitoring wells; therefore, the EHD approves the following reduction in sample <br /> collection: <br /> • Semi-annually collect groundwater from monitoring well MW-4 and analyze the samples for total <br /> petroleum hydrocarbons quantified as gasoline (TPH-g); total petroleum hydrocarbons quantified <br /> as diesel (TPI -d); and benzene, toluene, ethyl benzene, and total xylenes(BTEX). <br /> • Annually collect groundwater from all four wells and analyze the samples for TPH-g, TPH-d, and <br /> BTEX. <br /> The following information was provided in the SCM andrevious reports: <br /> ports: <br /> • Calculated residual mass of TPH-g in soil is estimated to be approximately 1,900 pounds and is <br /> concentrated in soil above the current groundwater table [within a horizontal diameter of <br /> approximately forty feet, extending from the surface to approximately thirty-.five feet below <br /> surface grade (bsg)]. <br /> • Depth to groundwater has historically been from approximately thirty to thirty-seven feet bsg. <br /> • The estimated mass of TPI-I-g in groundwater has been calculated to be approximately ane-and-a- <br /> third pounds. <br /> • The vertical extent of contaminants'of concern in groundwater may not have been defined based <br /> on the grab groundwater sample collected at seventy-two feet from soil boring SB-7; this data <br /> should be confinned or discounted. <br /> •. The residual mass of TPli quantified as diesel (TPH-d) was not calculated even though high r <br /> concentrations of TPI -d have been reported in soil and groundwater samples_ (The EHD <br /> believes that TPH-d concentrations may have come from a UST containing diesel that was <br /> removed in 1987, based on information on file at the EHD.) <br /> I� <br /> M <br />