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PUBLIC HEALTH SEkVICES <br /> SAN JOAQUIN COU 1-Y r' s <br /> JOG[KHANNA 11.D.. .P.H '1 <br /> Health Officer <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) 0 Stockton, California 95201 c4 1 A o'R <br /> (209) 468-3400 <br /> (ZLOO [PY <br /> LAURINO AND MARY LOU PONTES <br /> PONTES QUICKI-KLEEN CAR WASH <br /> 19441 SUTLIFF AUG 10 1993 <br /> ESCALON CA 95320 <br /> RE: Pontes Quicki-Kleen Car Wash SITE CODE: 1466 <br /> 707 East Yosemite Ave <br /> Manteca CA 95336 <br /> San Joaquin County Public Health Services,Environmental Health Division(PHS/EHD)has completed review <br /> of the"Monitoring Well installation Workplan"dated August 2, 1993 and prepared by Aegis Environmental. <br /> PHS/EHD has prepared the following comments for your information. <br /> You requested that PHS/EHD provide site closure. Prior toPHS/EHD issuance of site certification,the extent <br /> of residual soil contamination evidenced must not pose a threat to groundwater and once the groundwater <br /> gradient is established, the groundwater quality beneath the site must be shown not to be contaminated by <br /> petroleum hydrocarbons. <br /> PHS/EHD informed you, in correspondence dated July 21, 1993 and July 30, 1993, that a minimum of one <br /> monitoring well must be located in a verified downgradient d' ection. The work plan included the installation <br /> of one monitoring well. The work plan did not include in rmation that would indicate the well would be <br /> located in a verified down gradient direction. <br /> PHS/EHD informed you that three monitoring wells are necessary to determine the groundwater gradient <br /> beneath the site if monitoring wells on a nearby property are not available to determine the groundwater <br /> gradient. PHS/EHD informed you that PHS/EHD is unaware of any nearby wells which would provide <br /> gradient determination. <br /> PHSIEHD also questions the ability of the proposed groundwater monitoring well to investigate the extent <br /> of evidenced soil contamination. The map included in the work plan was not to scale;therefore,the proposed <br /> Iocation is approximate. Additionally, the predominate type of soil in the Manteca area, sand, facilitates the <br /> vertical migration of contaminates. Confirmation soil sampling should include a boring located to ascertain <br /> the extent of possible vertical migration of contaminants. <br /> Enclosed is the accepted permit to install the proposed mon Loring well. However,please be aware that prior j <br /> to PHS/EHD issuance of site certification additional soil and groundwater investigation will be required. <br /> Please also be informed that the site has been placed in the Local Oversight Program and you have been listed <br /> as the Responsible Party for the investigation and remediatio of the contamination which has been evidenced <br /> at the site. You will remain the Responsible Party until suck time as the site is issued closure. Furthermore, <br /> any future property owner will also be listed as a Responsible Party. <br /> i <br /> A t)Msion of an Joaquin Counry Heal C:we 5emm �� <br />