|
i
<br /> GROUND ZERO ANALYSIS, INC.
<br /> 2291 W March Lane, Suite 127D
<br /> Stockton, Ca.ifornia 95207
<br /> s Telephone: (209) 952-3481
<br /> F Fwsunde: (209) 952-9892
<br /> E '
<br /> August 15, 1997
<br /> Mr -,or: Rowe
<br /> San 'rbunty-Public Health Services
<br /> Envirc- ..-ntalHealth Division
<br /> 445 'Vor � wan .ioaquin street
<br /> P O ,_�� 38::
<br /> Stc�_---i, CA 95201-0388
<br /> Su4:est Third Quarter 1997 Groundwater Mcnitoring and Sampling Report
<br /> 1
<br /> Knowles/Roek Property, 102 South Wilson Way, Stockton, California
<br /> Y Mr '_:owe
<br /> Ufound Zero Analysis, Inc (Ground Zero) has ZfTV5� Us report for groundwater mcnztoring
<br /> XIC sampling performed during the third quarter 1997 at the subject site (Figure 1) Activities
<br /> included monitoring groundwater elevations, purging and sampling groundwater, and analyzing
<br /> am,ples for total petroleum hydrocarbons as gasoline rpHg), benzene, toluene, ethylbenzene,
<br /> -t^1 xy'-,enes (3'T`'-X), ar,. methyl tert-butyl eb,2r (MTBE)
<br /> .' -ounawater morWtoring was conducted on Juiy z2, 1997 The depth to gro -ndwater was
<br /> measured in each well and sub!-T- ,w5d from the wellhead elevation to determine groundwater
<br /> e ^vation Water levels rose an averaga 3f 0 0°7 feet since last monitored on May 7, 1997
<br /> C 3undwater flow was generally east.-soutneast.,rly at an average gradient of approximately
<br /> 0 :02 - 0 003 feet per "foot A groinndwater gradient map generated usingthe July 2
<br /> r.oliitorir, t.ta is shown ^— �,•• irp 2 t , P / �!
<br /> Table 1 �_ e,crit ground; �t.,r monitor--� d� ,�are �u�-� , --• �� _n
<br /> onitc__.-ng,logs az- incl=,ded •� ^-_f_3ctir.n, A
<br /> --�� �.,ic collected groundwater samples nom wells MW1 thro gh MW13 on July 22-and
<br /> -, "7 At least thiee well casing volumes were purged from each well prior to sampling
<br /> sical fla:.ameters (pH, Coad--Aiv y, temperature) were monitored during purging and allowed
<br /> � st<.bihze prior to sampling. Purged water war container, in 55-gallon drums approved by the
<br /> .,n� of Trans °
<br /> Porta�.t�:i and �er7tains,on si'-., pendin- analytical results Purge logs are
<br /> pr-;entea �n Attachment P
<br /> l�. _ � trail
<br /> r p
<br /> Piz' .Z avm anG s,.y]rted under c,iwn of custod .c ._�g�n L;b,m-.JrxF (D
<br /> . - ay W y
<br /> k " HS
<br /> ire Ly were ;.`lyzed for BTEX and MUM using �' C. rd ,020 and TPHg
<br /> __. ..� EPA method 8015 Recent analytical resultf of samples are
<br /> mm ._
<br /> Table 2 Attachment B contains laboratory rpor�, ;�_ .. st
<br /> am efc i w
<br /> t , y documentation
<br />
|