Laserfiche WebLink
PUBLIt HEALTH SEk---'VICES- <br /> �r <br /> OPgiJ <br /> SAN JOAQUIN COUNTY =. <br /> ENVIRONMENTAL HEALTH DIVISION "; X <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer =_ <br /> 435 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 ciFoe <br /> 209/468-3420 n . <br /> MR FRANK RYAN i <br /> FRANK RYAN REALTY <br /> 745 DISTAL DR MAILED J U 1. 141995 <br /> LOS ALTOS CA 94022 <br /> RE: Fuller Mobile Home Park SITE CODE: 2491 <br /> 365 E Louise <br /> Lathrop CA 94022 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the May 4, 1995 Quarterly Groundwater Sampling Report prepared by WHF, Inc. for , <br /> the above referenced site. ' <br /> The report describes sampling protocol, groundwater gradient, summarizes that contaminant <br /> levels are lower this quarter and proposes additional monitoring to calculate a new gradient. <br /> As of January 23, 1995 it appears that gradient is towards well MW-3. Gradient from April 11, <br /> 1995 indicates that gradient is away from MW-3. Gradient data from November 30, 1993 <br /> indicates a gradient similar to the regional North East gradient. Monitoring wells 1,2 and 3 <br /> were surveyed November 30, 1993 by DeLano and Allsup. All the wells were resurveyed on <br /> January 23, 1995 by Delano and Allsup. The collar elevations of MW-1 and 2 were changed <br /> and MW-5, 6 and 7 were surveyed in. Gradient calculations with the original collar elevations <br /> for MW 1 and 2 do not significantly change the apparent gradient. PHS/IIID recommends <br /> monthly depth to water measurements until the gradient can be determined. PHS/EHD requests <br /> all gradient calculations and modeling methodology to be included with the gradient report. The <br /> gradient report may be submitted with the quarterly monitoring report. Until the issue of <br /> gradient is resolved further investigation of groundwater will be limited to quarterly analytical <br /> monitoring. <br /> The tank removal occurred on September 9, 1990. Soil and groundwater contamination was <br /> confirmed and the excavation was backfilled with the tank overburden. Since that time a storm <br /> water pond was installed adjacent to the UST excavation and a groundwater investigation was <br /> initiated. At this time PHS/EHD recommends the remediation of contaminated soil in the <br /> former UST location to prevent this secondary hydrocarbon source from continuing to degrade <br /> groundwater quality at this site. <br /> The out of service ddnldng water well has not yet been abandoned due to the inability to recover <br /> any recorded as built information such as total depth, screen interval and depth of gravel pack <br /> regarding this well. PHS/EHD recommends that this well be destroyed by overdrilling the' <br /> existing borehole. Total depth of the overdrilling may be determined by the professional <br /> judgement of the licensed C-57 contractor during the drilling operation. <br /> A Division of San Joaquin County Health Care Services <br />