Interpret results of a chemical soil analysis report

Hello! We are currently considering purchasing a plot of land from the municipality (more precisely, a municipal housing company). We read in the development plan about a "geogenically caused slightly elevated heavy metal contamination" and inquired about the details from the city. The sales intermediary is very quick and immediately provided us with the results and also the written statements of the chemical soil report from the neighboring plot, as well as commissioned its own report for "our" plot. I have read the report and it sounds quite alright to me, but of course I am not a chemist. Who could help with the interpretation? I have already inquired about the classes (Z 0 to Z 5 according to LAGA Soil), but I still find the interpretation difficult... I also wouldn’t know who can help us with this? There are, for example, the following formulations: According to the present analysis findings, the native soils are to be classified in assignment value Z 1 according to LAGA Soil due to exceedances of the assignment value Z 0 of the parameters chromium, copper, nickel, zinc and TOC (test pit 1) or hydrocarbons C10-C40 (test pit 2). The fill sample test pit 3 shows an exceedance of the assignment value Z 0 for conductivity as well as for hydrocarbons (C10-C40), so that the fill corresponds to assignment value Z 1.1 according to LAGA Construction Waste. The results of the sample test pit 5 (fill) show exceedances of the assignment value Z 0 of the parameters PAH (EPA), PCB and nickel in the original substance. The hydrocarbons (C10-C40) exceed the assignment value Z 1.2, so that the fill material is to be classified in assignment value Z 2 according to LAGA Construction Waste. The examined topsoil from the soil heap shows exceedances of assignment value Z 0 for lead and zinc. Cadmium exceeds assignment value Z 1.1, so that the topsoil is to be classified in assignment value Z 1.2 according to LAGA Soil. The analyzed recycling material from test pits 4 and 6 meets the criteria for RCL I recycled building material (see report dated 12.07.2013). Therefore – except for the fill soil contaminated with hydrocarbons to be separated (test pit 5) – all investigated native and filled soils on the property can remain. According to the field investigations carried out, chemical analysis results and compaction inspections, it is hereby confirmed that no contaminated soils remain on the property and that the installed soils are sufficiently compacted. The individual chemical values still include mg/kg, which I have removed here. My question now is, are we "on the safe side" with this wording, especially the bolded part at the end, regarding the plot? Does anything still seem odd to you, are such results normal? We are completely clueless and therefore very much appreciate professional advice...

and one more thing: does the last sentence regarding compaction mean that we no longer have to have a normal soil report prepared (the one to test whether the soil is firm enough, or the groundwater situation), or does that have nothing to do with it?

The question cannot be answered without a crystal ball.

and I almost forgot: Does the last sentence regarding compaction mean that we no longer have to have a standard soil report made (the one to test whether the soil is firm enough, or the groundwater situation), or does it have nothing to do with that?

I would interpret it that way as a layperson. It is a soil report (with chemical analysis) of your property. Whoever can explain the whole thing to you: of course the author of the report - he can explain to you exactly what it means. Whether the report is sufficient for your developer / general contractor / home builder is for them to answer. There are companies that always send out their own experts because they only rely on them and companies that build without any report. Whether your above-mentioned report provides you with a legal basis for a lawsuit, in case the soil turns out to be non-load-bearing, I cannot tell you.

Oh man, I’m such a noodle - I never even thought of simply calling the lab to have them explain the report to me. Sometimes having a mental block is like having an entire fence in front of your head.

We are really lucky with the seller, a report is now being made specifically for our property, both a chemical one and one for load-bearing capacity and groundwater. The existing report referred to the property opposite ours.